EP2946115B1 - Spiral compressor - Google Patents

Description

The present invention relates to a scroll compressor with a fixed first spiral and an engaging, orbiting second spiral according to the preamble of claim 1. Such a scroll compressor is for example from EP 0 756 086 known. Scroll compressors, commonly called scroll compressors, are machines that can compress gases. They consist of two nested spirals whose opposite movement compresses the gas. Scroll compressors work according to the displacement principle, wherein one of the two spirals is stationary, while the other is guided over an eccentric drive on a circular path. In this case, the spirals touch each other several times and form within the turns several constantly smaller chambers, whereby the gas to be pumped sucked in the outside, compressed inside the pump and discharged through a connection in the middle of the coil. Such scroll compressors are also commonly used for compressors in refrigerators or heat pumps.

From the DE 696 31 306 T2 (equals to EP 0 756 086 A generic scroll compressor for compressing a fluid is known, comprising housing means for forming an outer backbone of the compressor, which is provided with an inlet port for introducing the fluid into the compressor and an outlet. By means of a rotation prevention device while a second movable scroll is forced to an orbiting motion. The rotation preventing means for this purpose has a plurality of pin and ring compositions, each having a pair of pins, each mounted on a compressor housing and the spiral. This is essentially an identishe Load on each pair of pins of the plurality of pin and ring compositions act.

From the US 801,182 is also a generic scroll compressor known.

The present invention addresses the problem of providing an improved embodiment for a scroll compressor of the generic type, which is characterized in particular by an alternative construction of a rotation prevention device.

This problem is solved according to the invention by the subject matter of independent claim 1. Advantageous embodiments are the subject of the dependent claims.

The present invention is based on the general idea of replacing in a conventional scroll compressor with a fixed first spiral and an orbiting second spiral engaging therein a hitherto used anti-rotation device which generates the orbiting motion of the second spiral by a pendulum slide mechanism , Such a pendulum slide mechanism offers the great advantage of being able to realize the orbiting movement of the second spiral with comparatively small moving masses and low noise development. At the same time a scroll compressor with such a pendulum slide mechanism offers a high degree of efficiency compared to previous scroll compressors. The term "scroll compressor" is to be understood explicitly not only a compressor, which increases the density of the fluid to be pumped, for example, the gas to be conveyed, but in the same way, an expansion machine, which by expanding the gas in the spiral spaces the density of the fluid to be delivered reduced. As a result, for example, an electric motor can be used as a generator. Throughout the present patent application, the term "scroll compressor" by the terms "Compressor" or "expansion machine" are replaced. According to the invention, the pendulum slide mechanism now has an inner ring and a pendulum connected and fixed / stationary outer ring, wherein the inner ring is on the one hand rotatably driven connected to an eccentric and on the other hand firmly connected to the second spiral, so that in a drive of the eccentric, the second spiral due to the pendulum slide mechanism performs the required orbiting movement, in particular with respect to the first spiral. The invention thus replaces the previously required to generate the orbiting movement scroll transmission through the pendulum slide mechanism.

In an advantageous embodiment of the solution according to the invention, the pendulum are pivotally mounted on the inner ring and guided in extending in the radial direction Pendelführungsnuten in the outer ring. Likewise, a reverse construction is conceivable in which the pendulum is articulated mounted on the outer ring and guided in the radial direction pendulum guide in the inner ring. Both embodiments allow the provision of a rotation prevention device for the second spiral, wherein theoretically the pendulum slide mechanism in addition to the promotion of a fluid, for example a separate fluid or for pre-compression of the recompressed in the scroll compressor fluid can be performed.

The pendulum guide grooves expediently have lateral groove walls with a sliding radius in the entry area. Such a sliding radius, which is formed in the manner of rounded groove walls, allows a particularly smooth movement of the pendulum slide mechanism, whereby in particular the efficiency of the scroll compressor according to the invention can be increased.

In an advantageous embodiment of the solution according to the invention, the pendulum are designed as a double pendulum with an inner leg and an outer leg hinged thereto. In this embodiment, pendulum guide grooves are arranged neither in the inner ring nor in the outer ring, but the Pendulum hinged to the inner ring or to the outer ring. The advantage of such a double pendulum lies in particular in a low-wear and smooth movement.

In a further embodiment, the pendulums are hingedly connected to a sliding element which is guided in the respective pendulum guide groove. Under certain circumstances, such a sliding element facilitates the sliding movement of the pendulum in the radial groove and, in addition, due to a piston-like design, enables a separate compression or expansion of a further fluid or the provision of a further compression / expansion stage. In principle, two further compression stages can be realized by the pendulum slide mechanism, namely the first between the inner ring and the outer ring and the second between the pendulum and the Pendelführungsnut, so that together with the first and second spiral purely theoretically a three-stage compressor can be provided or theoretically three separate fluids can be compressed or expanded.

In a further advantageous embodiment of the solution according to the invention, the inner ring is formed in one piece or in one piece with the second spiral. This eliminates the need to assemble the second spiral on the inner ring, since they are made together in a one-piece design together from a single piece. Of course, a one-piece design of the two components mentioned is conceivable, so that the spiral can be connected directly or indirectly via an intermediate piece with the inner ring.

Other important features and advantages of the invention will become apparent from the dependent claims, from the drawings and from the associated figure description with reference to the drawings.

It is understood that the features mentioned above and those yet to be explained not only in the combination specified, but can also be used in other combinations or in isolation, without departing from the scope of the present invention.

A preferred embodiment of the invention is illustrated in the drawings and will be explained in more detail in the following description.

Fig. 1

eine Schnittdarstellung durch einen erfindungsgemäßen Spiralverdichter,

Fig. 2a-c

unterschiedliche mögliche Ausführungsformen der erfindungsgemäßen Pendelschiebermechanik,

Fig. 3

eine Darstellung eines Pendels mit zusätzlichem Gleitelement,

Fig. 4a

eine Darstellung der Pendelschiebermechanik mit einem asymmetrischen Pendel,

Fig. 4b

ein symmetrisches Pendel wie es in einer Pendelführungsnut mit Abgleitradius geführt ist,

Fig. 5

eine Pendelschiebermechanik mit separatem Außenring,

Fig. 6

eine Darstellung wie in Fig. 5, wobei jedoch der Außenring in ein Gehäuse integriert ist,

Fig. 7

eine teilweise geschnittene Ansicht auf den Spiralverdichter mit Innenring und separat dazu ausgebildeter zweiter Spirale, die über ein Verbindungselement miteinander verbunden sind,

Fig. 8

eine Darstellung wie in Fig. 7, wobei jedoch Innenring und zweite Spirale einstückig ausgebildet sind,

Fig. 9

eine ähnliche Darstellung wie in Fig. 7, wobei jedoch der Innenring der Pendelschiebermechanik direkt mit der zweiten Spirale verbunden ist,

Fig. 10

eine weitere teilweise geschnittene Ansicht des erfindungsgemäßen Spiralverdichters, bei welcher sich Innenring, Pendel, Pendelführungsnuten und Außenring in einer Ebene befinden,

Fig. 11

eine Darstellung wie in Fig. 10, bei der sich jedoch der Außenring, die Pendel und der Innenring der Pendelschiebermechanik in unterschiedlichen Ebenen befinden.

In each case show schematically:

Fig. 1

a sectional view through a scroll compressor according to the invention,

Fig. 2a-c

different possible embodiments of the pendulum slide mechanism according to the invention,

Fig. 3

a representation of a pendulum with additional sliding element,

Fig. 4a

a representation of the pendulum slide mechanism with an asymmetrical pendulum,

Fig. 4b

a symmetrical pendulum as it is guided in a pendulum guide groove with sliding radius,

Fig. 5

a pendulum slide mechanism with separate outer ring,

Fig. 6

a representation like in Fig. 5 but wherein the outer ring is integrated in a housing,

Fig. 7

a partially sectioned view of the scroll compressor with inner ring and separately formed second spiral, which are interconnected via a connecting element,

Fig. 8

a representation like in Fig. 7 wherein, however, the inner ring and the second spiral are integrally formed,

Fig. 9

a similar representation as in Fig. 7 in which, however, the inner ring of the pendulum slide mechanism is directly connected to the second spiral,

Fig. 10

a further partially sectioned view of the scroll compressor according to the invention, in which the inner ring, pendulum, Pendelführungsnuten and outer ring are in a plane,

Fig. 11

a representation like in Fig. 10 in which, however, the outer ring, the pendulum and the inner ring of the pendulum slide mechanism are in different planes.

According to the FIGS. 1 and FIGS. 5 to 11, a spiral compressor 1 according to the invention has a fixed first spiral 2 and an orbiting second spiral 3 engaging therein. The area around the spirals 2, 3 is closed by a cover 24. The scroll compressor 1 can be operated by a switching operation, that is, a reversal of rotation, as an expansion machine, so that in the following, although always from the scroll compressor 1 is mentioned, but of course, an expansion machine 1 can fall. In order to realize the orbiting movement of the second spiral 3 relative to the first spiral 2, according to the invention, a scrolling mechanism previously used for this purpose is replaced by a pendulum slide mechanism 4 which has an inner ring 5 and a fixed outer ring 7 connected thereto via pendulum 6. The inner ring 5 is on the one hand rotatably drivingly connected to an eccentric 8, which in turn rotatably connected to a shaft 9, for example, driven by an electric motor 10 or a pulley, not shown. On the other hand, the inner ring 5 is fixedly connected to the second spiral 3, so that, when the eccentric 8 is driven, the second spiral 3, due to the pendulum slide mechanism 4, has the required orbiting movement the first spiral 2 executes. By the use according to the invention of the pendulum slide mechanism 4 as a rotation prevention device for the second spiral 3, a smooth-running and low-noise operation of the scroll compressor 1 or the expansion machine 1 can be achieved. In comparison to a scrolling mechanism used so far, the pendulum slide mechanism 4 also has significantly lower moving masses, as a result of which less energy has to be expended for operating the scroll compressor 1.

In the FIGS. 2a to 2c different embodiments of the invention Pendelschiebermechanik 4 are shown. According to the FIG. 2a the pendulum 6 are articulated mounted on the outer ring 7 and guided in extending in the radial direction Pendelführungsnuten 11 in the inner ring 5. FIG. 2b shows the reverse embodiment, in which the pendulum 6 articulated mounted on the inner ring 5 and guided in extending in the radial direction Pendelführungsnuten 11 in the outer ring 7. In general, the pendulum slide mechanism 4 should have at least three pendulums 6, but preferably it has more, in particular six or seven pendulum 6.

Looking at the Figure 2c , it can be seen that the pendulum 6 are designed as double pendulum, each with an inner leg 12 and an outer leg 13. In these double pendulums, the outer leg 13 is pivotally connected to the outer ring 7 and at the same time pivotally connected to the inner leg 12, whereas the inner leg 12 is connected via a kind of knee joint articulated to the outer leg 13 and on the other hand hinged to the inner ring 5. Pendelführungsnuten 11 are not required in this embodiment of the pendulum slide mechanism 4. Trained as a double pendulum pendulum 6 allow a very low-wear operation, since the previously occurring friction between the pendulum 6 and the outer ring 7 can be significantly reduced by trained as a double pendulum pendulum 6. The scroll compressor 1 according to the invention is also characterized by a smooth running.

The pendulum 6 according to the Figures 2a, 2b, 3 and 4b are also formed symmetrically, of course, asymmetric pendulum 6 can be used, as for example according to the FIG. 4a is shown. In order to ensure smooth operation of the pendulum slide mechanism 4, the pendulum guide grooves 11 in the entrance area can have side groove walls 14 with a sliding radius 15, as shown in detail in FIG FIG. 4b is shown.

Consider again the pendulum slide mechanisms 4 according to the FIGS. 2a to 2c , it can be seen that the individual pendulum 6 distributed symmetrically over the circumference, that is uniformly distributed over the circumference, the inner ring 5 and the outer ring 7 are arranged, of course, also not shown asymmetric arrangement on the circumference of the inner ring 5 and ., The outer ring 7 is conceivable. Also can be provided a sliding member 16, as shown in the FIG. 3 is shown, which slides like a piston in the associated pendulum guide groove 11. In this case, therefore, the pendulum 6 is articulated on the inner ring 5 or on the outer ring 7 and articulated on the sliding element 16.

Considering the embodiments of the scroll compressor 1 and the expansion machine 1 according to the FIGS. 5 and 6 so you can go in Fig. 5 recognize that the outer ring 7 is a separate component with respect to a housing 17 of the scroll compressor 1, whereas in the illustration according to the FIG. 6 the outer ring 7 is part of the housing 17 of the scroll compressor 1.

According to the FIG. 7 the inner ring 5 is connected via a connecting element 18 with the second spiral 3, whereas in FIG. 8 the inner ring 5 is formed integrally with the second spiral 3. Another alternative embodiment of this is in FIG. 9 shown, in which the inner ring 5 is connected directly to the second spiral 3, for example via a joint 19. Such joint compound 19 may for example be a thermal joint or a connection by means of welding, soldering or gluing.

Finally, considering the scroll compressor 1 according to the FIG. 10 , it can be seen that in this the inner ring 5, the pendulum 6 and parts of the outer ring 7 lie in a plane with respect to an axis 20 of the scroll compressor 1. Similarly, the scroll compressor 1 according to the FIG. 11 constructed there, where it is clearly visible that the pendulum 6 extend between two levels, wherein in the first level, a part of the pendulum 6 and the inner ring 5 of the pendulum slide mechanism 4 are arranged, whereas in the second level also a part of the pendulum 6 and the outer ring 7 are arranged. The inner ring 5 and the outer ring 7 are thus operatively connected to each other via the pendulum 6 extending over both planes.

In general, by replacing the previously required scroll transmission to produce the orbiting motion of the second scroll 3 by means of the pendulum slide mechanism 4 according to the invention, a scroll compressor 1 or an expansion machine 1 are created, which requires less energy to drive due to low moving masses and at the same time quiet and works with high efficiency.

Moreover, with the pendulum slider mechanism 4 according to the invention, it is possible to convey further fluids separately from that which is compressed or expanded by means of the first and second volutes 2, 3. The spiral compressor 1 according to the invention can thus compress or expand a gas in first chambers 21 and in second chambers 22 or third chambers 23 further fluids. The first spaces 21 lie between the first and second spiral 2, 3, whereas the second spaces between the inner ring 5, the outer ring 7 and the pendulums 6 are arranged. The third chambers 23 in turn are bounded on the one hand by the pendulum 6 or sliding element 16 and on the other hand by the pendulum guide groove 11. In theory, therefore, up to three separate fluids can be compressed or expanded with the scroll compressor 1 according to the invention, it being alternatively also conceivable that the first, second and third Rooms 21, 22 and 23 represent consecutive compression or expansion stages.

The scroll compressor 1 according to the invention can be used, for example, as a compressor in the field of air conditioners or refrigerating machines, in particular also in motor vehicles.

Claims (11)

1. Spiral compressor (1) with a fixed first spiral (2) and a second spiral (3) which engages, orbiting, in said first spiral, characterised in that a pendulum slider mechanism (4) is provided having an inner ring (5) and a stationary outer ring (7) connected with said inner ring via pendulums (6), wherein the inner ring (5) is on one side drivingly connected with an eccentric cam (8) and is on the other side fixedly connected with the second spiral (3), so that when the eccentric cam (8) is driven the second spiral (3) by reason of the pendulum slider mechanism (4) carries out the necessary orbiting movements with respect to the first spiral (2).
2. Spiral compressor according to claim 1, characterised in that the pendulums (6) are mounted hingedly on the inner ring (5) and are guided in pendulum guiding grooves (11) in the outer ring (7) extending in a radial direction, or vice versa.
3. Spiral compressor according to claim 1 or 2, characterised in that the pendulum guiding grooves (11) have in the entry region lateral groove walls (14) with a slide-off radius (15).
4. Spiral compressor according to one of claims 1 to 3, characterised in that the pendulums (6) are formed asymmetrically.
5. Spiral compressor according to one of claims 2 to 4, characterised in that the pendulum guiding grooves (11) are disposed symmetrically or asymmetrically at the circumference of the inner ring (5) or the outer ring (7).
6. Spiral compressor according to claim 1, characterised in that the pendulums (6) are in the form of double pendulums with an inner leg (12) and an outer leg (13) connected hingedly with said inner leg.
7. Spiral compressor according to one of claims 1 to 6, characterised in that the outer ring (7) is a separate component or alternatively forms a part of a housing (17) of the spiral compressor (1).
8. Spiral compressor according to one of claims 2 to 5 or 7, characterised in that the pendulums (6) are hingedly connected with a sliding element (16), which is guided in the respective pendulum guiding groove (11).
9. Spiral compressor according to one of claims 1 to 8, characterised in that

   - the inner ring (5) is formed in one piece or integrally with the second spiral (3), or

   - the inner ring (5) is directly connected with the second spiral (3), or

   - the inner ring (5) is connected by means of at least one further component with the second spiral (3).
10. Spiral compressor according to one of claims 1 to 9, characterised in that

    - the inner ring (5), the pendulums (6) and the outer ring (7) are disposed on one plane, or

    - at least one of these parts (5, 6, 7) is disposed on a different plane.
11. Spiral compressor according to one of claims 1 to 10, characterised in that

    - at least three, preferably six pendulums (6) are provided,

    - an electric motor (10) or a belt reel is provided to drive the eccentric cam (8).

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