This application claims priority to German Patent Application No. 10 2013 200 807.4, filed Jan. 18, 2013, and International Patent Application No. PCT/EP2014/050407, filed Jan. 10, 2014, both of which are hereby incorporated by reference in their entirety.
The present invention relates to a spiral compressor comprising a stationary first spiral and an orbiting second spiral that meshes with the first spiral.
Spiral compressors, usually also called scroll compressors, are machines which can compress gases. They consist of two spirals nested into one another, the motion of which in the opposite direction compresses the gas. Spiral compressors operate here by the displacement body principle, wherein one of the two spirals is stationary, whilst the other is guided on a circular path by means of an eccentric drive. Here, the spirals touch one another several times and form within the windings several chambers which become continuously smaller, whereby the gas which is to be pumped is drawn in externally, compressed within the pump and discharged via a connection in the spiral centre. Such spiral compressors are usually also used for compressors in cooling units or heat pumps.
From DE 696 31 306 T2 a generic spiral compressor for compressing a fluid is known, comprising a housing arrangement for forming an outer basic framework of the compressor, which is provided with an inlet opening for the introduction of the fluid into the compressor, and an outlet. By means of a rotation-preventing arrangement, a second movable spiral is forced here to an orbiting motion. For this, the rotation-preventing arrangement has a plurality of pin and ring compositions, wherein each has a pair of pins which are respectively mounted on a compressor housing and the spiral. Hereby, substantially an identical stress is to act on each pair of pins of the plurality of pin and ring compositions.
From U.S. Pat. No. 801,182 a generic spiral compressor is also known.
The present invention is concerned with the problem of indicating an improved embodiment for a spiral compressor of the generic type, which is distinguished in particular by an alternative structure of a rotation-preventing arrangement.
This problem is solved according to the invention by the subject of the independent claims. Advantageous embodiments are the subject of the dependent claims.
The present invention is based on the general idea, in a spiral compressor known per se comprising a stationary first spiral and an orbiting second spiral that meshes with the first spiral, of replacing a hitherto used rotation-preventing arrangement or anti-rotation arrangement which generates the orbiting motion of the second spiral, with a pendulum slide mechanism. Such a pendulum slide mechanism offers the great advantage of being able to realize the orbiting motion of the second spiral with comparatively small moved masses and a small noise development. At the same time, a spiral compressor with such a pendulum slide mechanism offers a high degree of efficiency compared to previous spiral compressors. The term “spiral compressor” is to be understood here to mean expressly not only a compressor which increases the density of the fluid which is to be conveyed, for example the gas which is to be conveyed, but in the same way also an expansion machine, which reduces the density of the fluid which is to be conveyed by expanding the gas in the spiral chambers. Hereby, for example, an electric motor can be used as generator. In the whole of the present patent application, the term “spiral compressor” can therefore be replaced by the terms “compressor” or “expansion machine”. According to the invention, the pendulum slide mechanism now has an inner ring and a fixed/stationary outer ring connected therewith via pendulum, wherein the inner ring on the one hand has a rotatable driving connection to an eccentric and on the other hand is rigidly connected to the second spiral, such that the second spiral performs the required orbiting motion in particular in relation to the first spiral, due to the pendulum slide mechanism when the eccentric is driven. The invention therefore replaces the scroll gear necessary hitherto for generating the orbiting motion, by the pendulum slide mechanism.
In an advantageous further development of the solution according to the invention, the pendulums are mounted articulatedly on the inner ring and are guided in pendulum guide grooves, running in radial direction, in the outer ring. Likewise, a reverse construction is also conceivable, in which the pendulums are articulatedly mounted on the outer ring and are guided in pendulum guide grooves, running in radial direction, in the inner ring. Both embodiments permit the provision here of a rotation-preventing arrangement for the second spiral, wherein purely theoretically the pendulum slide mechanism can be additionally embodied for the conveying of a fluid, for example of a separate fluid or for the initial compressing of the fluid which is recompressed in the spiral compressor.
Expediently, the pendulum guide grooves have in the entry region lateral groove walls with a sliding radius. Such a sliding radius, which is constructed in the manner of rounded-out groove walls, enables a particularly smooth movement of the pendulum slide mechanism, whereby in particular the efficiency of the spiral compressor according to the invention can be increased.
In an advantageous further development of the solution according to the invention, the pendulums are constructed as double pendulums with an inner leg and with an outer leg articulately connected therewith. In this embodiment, pendulum guide grooves are not arranged in the inner ring or in the outer ring, but rather the pendulums are articulatedly connected respectively to the inner ring or respectively 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 articulatedly connected with a sliding element, which is guided in the respective pendulum guide groove. Such a sliding element facilitates under certain circumstances the sliding movement of the pendulum in the radial groove and, furthermore, owing to a construction in terms of a piston, enables a separate compressing or respectively expanding of a further fluid or respectively the provision of a further compression/expansion stage. Through the pendulum slide mechanism, basically two further compression stages can be realized here, namely the first between the inner ring and the outer ring and the second between the pendulum and the pendulum guide groove, so that together with the first and second spiral, purely theoretically a three-stage compressor can be provided, or purely theoretically three separate fluids can be compressed or respectively expanded.
In a further advantageous embodiment of the solution according to the invention, the inner ring is constructed in one piece or in one part with the second spiral. Hereby, a mounting of the second spiral on the inner ring is superfluous, because in a one-piece construction these are produced together from a single piece. Of course, a one-part construction of the two said components is also conceivable, so that the spiral can be connected with the inner ring directly or indirectly via an intermediate piece.
Further important features and advantages of the invention will emerge from the subclaims, from the drawings and from the associated figure description with the aid of the drawings.
It shall be understood that the features mentioned above and to be explained in further detail below are able to be used not only in the respectively indicated combination, but also in other combinations or in isolation, without departing from the scope of the present invention.
A preferred example embodiment of the invention is illustrated in the drawings and is explained in further detail in the following description.
There are shown here, diagrammatically respectively
According to
In
When one observes
The pendulums 6 according to
Looking again at the pendulum slide mechanisms 4 according to
When one observes the embodiments of the spiral compressor 1 or respectively of the expansion machine 1 according to
According to
Finally, when one observes the spiral compressor 1 according to
Generally, by the replacement of the hitherto necessary scroll gear for generating the orbiting motion of the second spiral 3 by means of the pendulum slide mechanism 4 according to the invention a spiral compressor 1 or respectively an expansion machine 1 can be created, which owing to smaller moved masses requires less energy for driving and, at the same time, operates in a low-noise manner and with a high degree of efficiency.
Moreover, with the pendulum slide mechanism 4 according to the invention it is possible to convey further fluids separately from that which is compressed or respectively expanded by means of the first and second spiral 2, 3. The spiral compressor 1 according to the invention can therefore compress or respectively expand a gas in first chambers 21 and further fluids in second chambers 22 or respectively third chambers 23. The first chambers 21 lie here between the first and second spiral 2, 3, whereas the second chambers are arranged between the inner ring 5, the outer ring 7 and the pendulums 6. The third chambers 23 in turn are delimited on the one hand by the pendulum 6 or respectively sliding element 16 and on the other hand by the pendulum guide groove 11. Purely theoretically, therefore, up to three separate fluids can be compressed or respectively expanded with the spiral compressor 1 according to the invention, wherein alternatively it is also conceivable that the first, second and third chambers 21, 22 and 23 constitute compression or respectively expansion stages connected in series.
The spiral compressor 1 according to the invention can be used for example as a compressor in the region of air-conditioning systems or respectively cooling units, in particular also in motor vehicles.
Number | Date | Country | Kind |
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10 2013 200 807.4 | Jan 2013 | DE | national |
Filing Document | Filing Date | Country | Kind |
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PCT/EP2014/050407 | 1/10/2014 | WO | 00 |