CN116696719A - Lubricant containment for refrigerant compressor and refrigerant compressor - Google Patents

Abstract

The present application relates to a lubricant housing part including: at least one rotationally symmetrical, sleeve-shaped receiving section for receiving lubricant, wherein the longitudinal axis of the receiving section can be arranged coaxially to the longitudinal axis of the crankshaft of the refrigerant compressor, a fastening section connected to the receiving section for fastening the lubricant receiver to the crankshaft, and at least one end region connected to the receiving section, which encloses the receiving section except for an inlet opening, wherein the inlet opening in the end region allows lubricant from a lubricant channel of the refrigerant compressor into the receiving section of the lubricant receiver which at least partially protrudes into the lubricant channel, wherein the inlet opening is arranged in the end region surrounding the longitudinal axis, wherein the inlet opening has a non-circular circumferential shape as viewed in the direction of the longitudinal axis, wherein the inlet opening has the shape of a long hole, and wherein the middle point of the long hole is offset from the intersection of the longitudinal axis of the receiving section with the end region of the lubricant receiver.

Description

Lubricant containment for refrigerant compressor and refrigerant compressor

This application is a divisional application of an invention patent application with the national application number 201780069043.7, the application date is December 22, 2017, and the title is "a lubricant container for a refrigerant compressor and a refrigerant compressor".

technical field

The invention relates to a lubricant container. Furthermore, the invention also relates to a refrigerant compressor.

Background technique

In refrigerant compressors it is especially important to ensure adequate lubrication of all moving parts. For this purpose, it can be provided that lubricant accumulated in a lubricant sump covering the base region of the compressor housing is conveyed via the crankshaft in the direction of the cylinders.

For this purpose, a sleeve-shaped lubricant receptacle is often provided, which is connected in a rotationally fixed manner to the crankshaft and is arranged coaxially therewith and protrudes with an end section into the lubricant groove. Lubricant entering the housing section of the lubricant housing from the lubricant groove through the inlet is forced into a parabolic shape due to the rotation of the lubricant housing due to the rotation of the crankshaft, wherein the paraboloid is along the lubricant The inner wall of the receiving portion is also formed along the inner wall of the crankshaft.

The maximum height to which the lubricant in the receptacle section of the lubricant receptacle can be raised in this way is naturally reached within the clear inner diameter of the crankshaft and depends on the square of the rotational speed of the lubricant receptacle and the square of the net inner radius of the crankshaft or lubricant containment.

When manufacturing parameters (such as the net inner radius of the crankshaft, the height of the outlet borehole) and process parameters (such as the rotation speed of the crankshaft, the viscosity of the lubricant) are selected accordingly, the lubricant can be transported from the compressor by means of the lubricant receiver. The bottom of the housing feeds via the crankshaft of the compressor to the bearing points of the main bearing of the crankshaft, the crank pin and the connecting rod of the refrigerant compressor.

A compressor with such a lubricant receiver is known, for example, from WO 2009/092147 A1.

When using these devices, however, the lubricant is usually located in the lubricant reservoir and/or in the area of the inlet and/or in the entire lubricant delivery system (ie in the area between the lubricant sump and the components to be lubricated). In this region) air bubbles form which cause short-term interruptions of the lubrication system. Furthermore, the air bubbles may cause fluctuations in the vertical position of the lower apex of the paraboloid. When the apex falls into the region of the inlet, this can lead to an interruption of the lubricant delivery system and thus to a break in the parabolic shape of the lubricant in the lubricant receptacle or in the crankshaft.

Due to a malfunction in the lubricant delivery system, there were fluctuations in the oil delivery from the crankpin. In the extreme cases that can be seen when oil delivery is interrupted, all moving parts operate without lubrication, so the compressor fails in the shortest possible time.

Contents of the invention

It is therefore the object of the present invention to provide a lubricant receiver and furthermore also to provide a refrigerant compressor with a lubricant receiver according to the invention, wherein it is possible to avoid Air bubbles cause permanent sealing of the inlet.

Furthermore, it should be ensured that, when air bubbles are once generated, they can collapse in the shortest possible time and thus do not close the lubricant receptacle for a prolonged period of time.

Furthermore, the lubricant receiver according to the invention should be particularly simple and cost-effective to produce and should be structurally simple.

In the lubricant receiver according to the invention, the object is solved in that the inlet, viewed in the direction of the longitudinal axis, has a non-circular circumferential shape, the inlet has the shape of an elongated hole, and the elongated The center point of the bore is offset from the intersection point of the longitudinal axis of the receiving section and the end region of the lubricant receiver, wherein the lubricant receiver according to the invention comprises at least one rotationally symmetrical sleeve for receiving the lubricant shaped housing section, wherein the longitudinal axis of the housing section can be arranged coaxially with the longitudinal axis of the crankshaft of the refrigerant compressor; a fixing section connected to said housing section in order to fix the lubricant housing on the crankshaft; and at least one end region connected to the receiving section, which closes the receiving section except for the inlet, wherein the inlet enables lubricant to enter from the lubricant sump of the refrigerant compressor into At least part of the lubricant receptacle protrudes into a receptacle section of the lubricant groove, wherein the inlet is arranged in this end section around the longitudinal axis.

In particular, the projection, i.e. the orthogonal projection of the end region along the longitudinal axis of the receiving section, should be configured in such a way that the rotation about the intersection point of the longitudinal axis of the receiving section and the end region is not correct based on the entrance. Symmetrical, because this asymmetrical configuration prevents the inlet from being permanently closed due to gas bubbles forming in the region of the lubricant receptacle or inlet. Although in principle it may occur as usual that the inlet of the lubricant reservoir is temporarily blocked by air bubbles, the lubricant reservoir according to the invention causes that possible gas bubbles are based on the effects on the gas bubbles that come out of the lubricant reservoir and close the inlet. The uneven distribution of centripetal force is unstable and immediately falls off the inlet. In this case, the inlet is released again after a minimum time, for example a maximum of 2 seconds, so that a permanent closure can be prevented.

According to the invention it is provided that the inlet is arranged in the end region around the longitudinal axis. The required asymmetry of the orthogonal projection of the end region with respect to the rotation about the intersection between the longitudinal axis of the receiving section and the end region, either by a non-circular configuration of the circumferential shape of the inlet or by a circular This is achieved by a corresponding offset of the midpoint of the inlet and the longitudinal axis.

In this case, the end region of the lubricant receptacle can either be designed flat, in which case the round edges of the inlet also lie in a plane; however, the end region of the lubricant receptacle can also be designed 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 peripheral shape viewed in the direction of the longitudinal axis.

Some advantages are also obtained from a manufacturing point of view if the inlet has its origin in the center of rotation of the end region of the lubricant receptacle. The desired shape of the inlet, which contains the intersection between the longitudinal axis of the receiving section and the end region, can in this case be obtained in a simple manner by reprocessing the contour of the inlet. Said shape causes the required asymmetry of said projection of the end region. Starting from a circular, centrally arranged borehole, an inlet with a circumferential shape that satisfies the required asymmetry conditions can thus be created.

Furthermore, the inlets arranged around the longitudinal axis in the end region lead to an even faster collapse of the air bubbles closing the inlets. In contrast to lubricant receivers with inlets arranged radially outward, ie without surrounding the longitudinal axis, air bubbles formed in the lubricant receiver according to the invention naturally reach the inlet faster. Therefore, it should be noted that the lubricant entering the receiving section of the lubricant receiver from the lubricant groove through the inlet is first forced into a parabolic shape due to the rotation of the lubricant receiver caused by the rotation of the crankshaft, wherein the paraboloid Formed along the inner wall of the lubricant containing portion. During rotation of the lubricant containment in an operating state of the compressor on which the lubricant containment is mounted on the crankshaft, exhaust effects within the lubricant containment lead to a change in the geometry of the paraboloid. This has the result that the apex of the parabola formed in the region of the longitudinal axis of the receiving section always descends continuously in the direction of the end region of the lubricant holder. Only when the apex of the paraboloid reaches the inlet is a part of the paraboloid, namely the air bubble, able to escape from the lubricant receptacle. Due to the arrangement and shape according to the invention of the inlet, the gas bubbles burst out of the inlet in the shortest possible time, typically after a few tenths of a second. However, if the inlet is not arranged around the longitudinal axis but rather in the radially outer edge region of the end region, it may take a long time for air bubbles, if any, to escape from the lubricant receptacle. In this case, a break in the parabola or an abrupt drop in the delivery performance of the lubricant can occur in the lubricant receptacle.

In principle, the most differently shaped and arranged inlets of the orthogonal projection of the end region can be obtained with respect to a rotation about the intersection point of the longitudinal axis of the receiving section of the lubricant holder with the end region, ie about the midpoint of the projection. The required asymmetry. The asymmetry can be achieved, for example, by means of an oval or circular inlet, wherein the center point of the circular inlet should not differ from the longitudinal axis of the receptacle section of the lubricant receptacle to the end region of the lubricant receptacle. intersection points coincide.

Therefore, in a preferred embodiment of the invention it is provided that the inlet has an elliptical circumferential shape viewed in the direction of the longitudinal axis.

It may also be advantageous to have an inlet with a substantially elliptical circumferential shape, wherein the circumferential shape of such an inlet, although not a mathematically perfect ellipse, leads to a similar appearance.

The desired asymmetry of the inlet can be achieved in a particularly simple and cost-effective manner in the lubricant receiver according to the invention in that the inlet has the shape of an elongated hole. In this case, the center point of the elongated hole can either coincide with the intersection point of the longitudinal axis of the receiving section of the lubricant receiver and the end region, or be offset from this intersection point. In both cases the required asymmetry is achieved, since the projection of the end region along the longitudinal axis of the receiving section is based on the elongated hole with respect to the rotation about the intersection of the longitudinal axis of the receiving section and the end region is asymmetrical. FIG. 2 shows a lubricant receiver according to the invention with an elongated hole whose center point does not coincide with the intersection point.

It has been found here that the embodiment of the inlet as an elongated hole according to the invention is considered to be particularly advantageous with regard to the introduction of lubricant from the lubricant sump into the receiving section or with regard to preventing the inlet from being permanently blocked by air bubbles.

In a particularly preferred embodiment variant of the lubricant receptacle according to the invention, a hydrodynamically optimized introduction of lubricant from the lubricant groove into the receptacle section of the lubricant receptacle can be achieved as follows , that is, the elongated hole is delimited semicircularly on both sides and the longitudinal side of the elongated hole is greater than the radius of the semicircular delimitation.

In order to simplify the production of such elongated holes, it is provided in another preferred embodiment variant of the lubricant receiver according to the invention that the length of the longitudinal sides of the elongated hole is equal to twice the radius of the semicircular boundary. to double.

Longitudinal sides here mean the sides of the elongated hole that are straight and run parallel to one another. Furthermore, the overall length of the slotted hole is formed from the length of the longitudinal sides plus the two radii of the semicircular boundary.

Since the size and shape of the inlet has an effect on the paraboloid formed in the receiving section of the lubricant receiving part during rotation, these parameters must be selected carefully. In another particularly preferred embodiment variant of the lubricant receptacle according to the invention, it has been found to be particularly advantageous if the size of the inlet is between 5% and 30% of the clear cross-section of the receptacle section, Preferably between 10% and 25%, particularly preferably between 15% and 20%. As a result, a particularly advantageous parabolic shape can be formed within the receiving section.

In order to be able to convey the lubricant in the receiving section of the lubricant receiving part within the crankshaft in the direction of the cylinder while making full use of the rotation of the crankshaft, interference between the inside of the lubricant receiving part and the crankshaft should be minimized. A paraboloid of revolution formed on the inner surface of .

In order to achieve an as uninterrupted transition as possible between the receiving section of the lubricant receiving part and the crankshaft, it is provided that the lubricant receiving part has a fastening section (16) connected to the receiving part in order to secure the lubricant receiving part fixed on the crankshaft. Alternatively or additionally, the fastening section can be used to secure the lubricant receiver to the rotor which is connected to the crankshaft in a rotationally fixed manner.

In a preferred embodiment of the invention, the lubricant receiver has at least one lubricant carrier for the lubricant in order to facilitate the formation of a lubricant paraboloid in the lubricant receiver.

The lubricant carrier can here be formed by a rigid structure, for example a twisted sheet metal element, which is arranged in the receiving section.

The object of the invention is achieved in a refrigerant compressor in that the refrigerant compressor has a lubricant receiver according to the invention in order to draw lubricant out of a base formed in the bottom region of the compressor housing The lubricant sump is fed to the piston-cylinder unit via the crankshaft, wherein the lubricant receptacle is connected to the crankshaft in a rotationally fixed manner, and the refrigerant compressor comprises: a hermetically sealable compressor housing; An electric drive unit in the interior of the housing, which comprises a rotor and a stator; a crankshaft connected in a rotationally fixed manner to the rotor; and a piston-cylinder unit arranged in the interior of the housing, which comprises a movably supported A piston in a cylinder of a piston-cylinder unit that is crankable to compress the refrigerant.

Through the use of the lubricant receiver according to the invention in a hermetically sealable refrigerant compressor, in particular the projection of the end region of the lubricant receiver around the longitudinal axis and the The rotationally asymmetric design of the points of intersection between the end regions ensures better lubrication of all parts of the refrigerant compressor that are intended to be lubricated than with conventional, ie, more symmetrical, lubricant receivers, since it is possible to avoid The inlet is permanently closed due to the formation of air bubbles in the area of the lubricant receptacle or in the area of the inlet and reduces the influence of fluctuations of the lower apex of the paraboloid on the entire lubricant delivery system.

Due to the continuous flow of lubricant from the receiving section into the crankshaft and from the crankshaft via the outlet to the components to be lubricated of the refrigerant compressor when the lubricant receiver is used in an operational manner, it is necessary to ensure a continuous supply of lubricant to the In the housing section of the lubricant housing.

In a particularly preferred embodiment of the refrigerant compressor according to the invention, provision is made for this purpose that the end region of the lubricant receptacle protrudes at least partially into the lubricant groove, so that the inlet is arranged in the lubricant groove , so that the lubricant can enter the receiving section of the lubricant receiving part from the lubricant groove.

In order to facilitate the formation of the parabolic shape of the lubricant in the receiving section, in another particularly preferred embodiment of the refrigerant compressor according to the invention it is provided that the lubricant receiving part is fastened by means of the fastening section on the side of the crankshaft facing away from the piston. - on the end section of the cylinder unit and/or on the rotor.

In particular, it can be provided that the inner diameter of the receiving section of the lubricant receiver corresponds to the clear inner diameter of the crankshaft and that the fastening section of the lubricant receiver is pushed onto the end section of the crankshaft from the outside, thus ensuring A continuous transition between the housing section of the upper part and the crankshaft.

Description of drawings

The invention is now explained in detail with the aid of examples. The drawings are exemplary and, while intended to illustrate inventive concepts, are by no means limiting or even their definitive presentation of inventive concepts.

In the picture:

FIG. 1 shows a lubricant container according to the invention;

Fig. 2 shows the lubricant container of Fig. 1 viewed along the longitudinal axis of the lubricant container;

FIG. 3 shows a refrigerant compressor according to the invention with a lubricant receiver according to the invention;

FIG. 4 shows a lubricant receiver according to the invention with a lubricant paraboloid formed in the lubricant receiver in an operating mode of the refrigerant compressor.

Detailed ways

FIG. 1 shows a variant embodiment of a lubricant receiver 1 according to the invention. The lubricant receiver 1 is formed from a plurality of sleeve-shaped sections each having a constant diameter, wherein the transition regions between these sections of constant diameter extend continuously in the embodiment variant shown, but can also It is not hindered that the overall configuration is discontinuous, that is, it is configured to extend substantially in steps.

The lubricant container 1 comprises a fastening section 16 (see FIG. 3 ) for fastening the lubricant container 1 on the crankshaft 2 or the rotor 11 of the refrigerant compressor 3 and connected to the fastening section 16, Receptacle section 4 with a reduced diameter than fastening section 16 for accommodating lubricant.

The receptacle section 4 itself again has a cylindrical side surface and is closed on its bottom side, ie on the side facing away from the fastening section 16 , by the end region 5 of the lubricant receptacle 1 .

Overall, the description above results in a sleeve-shaped structure of the lubricant receiver 1 , which is open at the top and closed at the bottom by the end region 5 except for the inlet 6 for the lubricant. Both the fastening section 16 and the receiving section 4 are each rotationally symmetrical with respect to a rotation about the longitudinal axis 8 of the receiving section 4 .

The inlet 6 establishes a fluid connection between the housing interior of the refrigerant compressor 3 and the housing section 4 in operating conditions of the lubricant housing 1 in which the lubricant housing 1 It is arranged coaxially to the crankshaft 2 and is connected in a rotationally fixed manner to the crankshaft 2 .

FIG. 2 shows the lubricant receptacle 1 from FIG. 1 as a two-dimensional projection along the longitudinal axis 8 of the receptacle section 4 . The arrangement and shape of the inlet 6 arranged in the end region 5 can be clearly seen in particular from FIG. 2 .

In the specific exemplary embodiment, the shape of the inlet 6 , which is designed as an elongated hole, leads to the fact that the projection 18 of the end region 5 along the longitudinal axis 8 is no longer symmetrical under rotation about the intersection point 19 of the longitudinal axis 8 with the end region 5 . Only the rotation of the projection 18 around said intersection point 19 by an angle of 360° describes the projection 18 of the end region 5 itself, so that a rotation of a two-dimensional object does not exactly satisfy the rotation of a two-dimensional object when a rotation about a point by any angle itself describes the object. The condition of rotational symmetry upon which the symmetry is based.

The asymmetry of the end region 5 of the lubricant receptacle 1 caused by the inlet 6 leads precisely to the fact that, in the operating conditions of the lubricant receptacle 1 , in the region of the lubricant receptacle 1 , in particular in the region of the inlet 6 In this case, no air bubbles are formed which interrupt the lubricant flow and a continuous supply of lubricant can be ensured for all components of the refrigerant compressor 3 which are intended to be lubricated, wherein the lubricant receiver 1 is rotationally fixed in the operating state It is connected to the crankshaft 2 of the refrigerant compressor 3 and is arranged coaxially with this crankshaft 2 such that at least the end region 5 protrudes partially into a lubricant groove 7 of the refrigerant compressor 3 (see FIG. 3 ).

FIG. 3 shows a variant embodiment of a refrigerant compressor 3 according to the invention, which comprises a drive unit 10 in a compressor housing 9, a piston-cylinder unit 13 and a combination of drive unit 10 and piston-cylinder unit 13. Crankshaft 2 connected to cylinder unit 13 , wherein lubricant receiver 1 according to the invention is connected coaxially and torsionally fixedly to crankshaft 2 in such a way that lubricant receiver 1 protrudes at least partially into compressor housing 9 . lubricant groove 7 in the bottom area 17 of the

Crankshaft 2 is non-rotatably connected to rotor 11 , which surrounds stator 12 of drive unit 10 in the illustrated embodiment variant of refrigerant compressor 3 according to the invention, and is brought into rotation by drive unit 10 . On the one hand, 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 suck, compress and push the refrigerant out of the housing interior; On the other hand, the rotating crankshaft 2 also initiates a rotational movement of the lubricant receptacle 1 , which causes the lubricant entering the receptacle section 4 through the inlet 6 to assume the shape of a paraboloid 20 .

When the production parameters of the lubricant receiver 1 (in particular the inner diameter of the receiver 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, at Due to the shape of the paraboloid 20 , the lubricant in the receiving section 4 reaches a height of elevation which enables the lubricant to be transferred from the lubricant receiving part 1 into the crankshaft 2 .

For the further delivery of the lubricant, the crankshaft 2 can alternatively be manufactured at least partially as a hollow cylinder, in which case the lubricant exits the crankshaft 2 through openings in the side surfaces of the hollow cylinder and can reach the outlet of the refrigerant compressor 3 The components to be lubricated are specified; in this case, the maximum rise must extend at least as far as the first opening in the side surface. However, it can also be provided that the crankshaft 2 is designed as a solid cylinder and that this solid cylinder is provided with an eccentric and generally obliquely upwardly extending bore hole 21 , by means of which further lubricant can be fed. In the case of obliquely running boreholes 21 , a small maximum rise of the lubricant is sometimes sufficient because it only needs to transfer the lubricant to the borehole 21 without bridging as far as the first opening. the entire path. In the obliquely extending borehole 21 of the crankshaft 2 , the lubricant is pressed against the wall of the borehole 21 and thus delivered to the first opening in the side surface of the crankshaft 2 .

FIG. 4 shows the connection according to the invention of the crankshaft 2 in the refrigerant compressor 3 at different points in time t, t+1, t+2 and t+3 of the operating conditions of the refrigerant compressor 3. Lubricant container 1. At time step t, paraboloid 20 is visible without bubbles. As soon as the degassing effect begins in the lubricant receptacle 1 , the shape of the paraboloid changes. Here, the apex 22 of the paraboloid 20 drops further in the direction of the end region 5 of the lubricant receptacle 1 , as indicated by the development of the paraboloid 20 from time t via time t+1 to time t+2. . Finally, as soon as the apex 22 of the paraboloid 20 has reached the end region 5 , the part of the paraboloid, ie the part containing the air bubbles, leaves the lubricant receptacle 2 through the inlet 6 . This is ensured in that the inlet 6 is arranged in the end region 5 around the longitudinal axis 8 . When air bubbles leave the lubricant receptacle 1 through the opening 6 , the air bubbles close this opening and thus prevent lubricant from being able to enter the lubricant receptacle 1 from the lubricant groove 7 . Viewed in the direction of the longitudinal axis, the inlet 6 either has a circular peripheral shape and the midpoint of the inlet is offset from the longitudinal axis 8, or the inlet 6 has a non-circular peripheral shape viewed in the direction of the longitudinal axis, but it is ensured that The gas bubble becomes unstable and bursts out of the lubricant reservoir 1 or from the inlet 6 after a short time and releases said lubricant reservoir or inlet again.

List of reference signs

1 Lubricant container

2 crankshafts

3 refrigerant compressors

4 storage sections

5 end area

6 entrances

7 Lubricant tank

8 longitudinal axis

9 compressor housing

10 drive unit

11 rotor

12 stator

13 piston-cylinder unit

14 pistons

15 cylinders

16 fixed sections

17 Bottom area

18 Projection of end regions

19 Longitudinal axis - end zone intersection

20 paraboloid

21 Drilling of the crankshaft

22 Vertices of a paraboloid

Claims (11)

1. A lubricant reservoir (1) for vertically conveying lubricant by means of a crankshaft (2) of a refrigerant compressor (3), the lubricant reservoir (1) comprising:

at least one rotationally symmetrical, sleeve-shaped receiving section (4) for receiving lubricant, wherein a longitudinal axis (8) of the receiving section (4) can be arranged coaxially to a longitudinal axis of a crankshaft (2) of the refrigerant compressor (3),

-a fixing section (16) connected to the containing section (4) for fixing the lubricant containing section (1) to the crankshaft (2), and

at least one end region (5) connected to the receiving section (4), which end region closes the receiving section (4) except for an inlet (6), wherein the inlet (6) in the end region enables lubricant to pass from a lubricant sump (7) of the refrigerant compressor (3) into the receiving section (4) of the lubricant receptacle (1) which at least partially protrudes into the lubricant sump (7), wherein the inlet (6) is arranged in the end region (5) surrounding the longitudinal axis (8),

the inlet (6) has a non-circular circumferential shape as seen in the direction of the longitudinal axis, wherein the inlet (6) has the shape of a slot, and the center point of the slot is offset from the intersection of the longitudinal axis of the receiving section and the end region of the lubricant receptacle.

2. Lubricant reservoir (1) according to claim 1, characterized in that the slot is delimited semi-circularly on both sides and the longitudinal sides of the slot are larger than the radius of the semicircular delimitation.

3. Lubricant reservoir (1) according to claim 2, characterized in that the length of the longitudinal side of the slot is between one and two times the radius of the semicircular delimitation.

4. A lubricant reservoir (1) according to any one of claims 1 to 3, characterized in that the size of the inlet (6) is between 5% and 30% of the net cross-section of the reservoir section (4).

5. A lubricant reservoir (1) according to any one of claims 1 to 3, characterized in that the size of the inlet (6) is between 10% and 25% of the net cross-section of the reservoir section (4).

6. A lubricant reservoir (1) according to any one of claims 1 to 3, wherein the inlet (6) is sized between 15% and 20% of the net cross-section of the reservoir section (4).

7. A lubricant reservoir (1) according to any one of claims 1 to 3, wherein the reservoir section has a cylindrical side surface in order to form a lubricant paraboloid within the reservoir section.

8. System comprising a crankshaft (2) of a refrigerant compressor (3) and a lubricant reservoir (1) according to any one of claims 1 to 7, wherein the lubricant reservoir (1) is arranged coaxially to the crankshaft (2) and is connected to the crankshaft (2) in a rotationally fixed manner.

9. A refrigerant compressor (3) having:

a compressor housing (9) which can be encapsulated in a sealing manner,

an electric drive unit (10) arranged in the housing interior of the compressor housing (9), comprising a rotor (11) and a stator (12),

-a crankshaft (2) connected in torsion with a rotor (11), and

a piston-cylinder unit (13) arranged in the interior of the housing, which piston-cylinder unit comprises a piston (14) movably supported in a cylinder (15) of the piston-cylinder unit (13), which piston can be driven by the crankshaft (2) to compress a refrigerant,

the refrigerant compressor (3) has a lubricant reservoir (1) according to any one of claims 1 to 7, in order to supply lubricant from a lubricant sump (7) formed in a bottom region (17) of the compressor housing (9) to the piston-cylinder unit (13) via the crankshaft (2), wherein the lubricant reservoir (1) is connected in a rotationally fixed manner to the crankshaft (2).

10. A refrigerant compressor (3) as claimed in claim 9, characterized in that the end region (5) of the lubricant reservoir (1) extends at least partially into the lubricant channel (7), whereby the inlet (6) is arranged in the lubricant channel (7) in order to enable lubricant to pass from the lubricant channel (7) into the reservoir section (4) of the lubricant reservoir (1).

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