Rotor, motor, compressor and refrigeration equipment

Abstract

The invention discloses a rotor, a motor, a compressor and refrigeration equipment, and relates to the technical field of refrigeration equipment, the rotor comprises a rotor iron core and permanent magnets, the rotor iron core is provided with a plurality of permanent magnet grooves at intervals, intersection points of symmetric lines of the permanent magnet grooves and groove walls of the permanent magnet grooves are defined as first intersection points and second intersection points, and the first intersection points and the second intersection points are arranged at intervals. The first intersection point is located on one side, close to the outer peripheral wall of the rotor core, of the second intersection point; each group of permanent magnets comprises one first permanent magnet and one second permanent magnet, one permanent magnet groove corresponds to one group of permanent magnets, the number of pole pairs of the permanent magnets is P, the width of the first permanent magnet and / or the width of the second permanent magnet are / is W, the shortest distance between the first intersection point and the first permanent magnet or the second permanent magnet is L1, the length of the first permanent magnet and / or the second permanent magnet is L2, L1 is larger than or equal to 1 / P and smaller than or equal to 0.15 L2, and L1 is smaller than or equal to W. According to the technical scheme provided by the invention, the anti-demagnetization performance of the rotor is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration equipment, and in particular to a rotor, a motor, a compressor and refrigeration equipment. Background Art

[0002] At present, rare earth permanent magnet motors have the advantages of simple structure, reliability, high efficiency and high power density, and are widely used. However, rare earth permanent magnets are at risk of demagnetization under high temperature conditions. Increasing the thickness of rare earth permanent magnets in the magnetization direction can improve the anti-demagnetization performance to a certain extent, but the improvement in motor performance is very limited and will reduce the cost performance of the motor. How to improve the anti-demagnetization performance by optimizing the motor rotor structure without increasing the thickness of rare earth permanent magnets is very important for improving the cost performance of motors. Summary of the invention

[0003] The main purpose of the present invention is to provide a rotor, a motor, a compressor and a refrigeration device, aiming to improve the anti-demagnetization performance of the rotor.

[0004] To achieve the above object, the rotor proposed in the present invention comprises: A rotor core, wherein a plurality of permanent magnet slots are arranged at intervals on the rotor core, and intersections of symmetry lines of the permanent magnet slots and slot walls of the permanent magnet slots are defined as a first intersection and a second intersection, wherein the first intersection is located on a side of the second intersection close to an outer peripheral wall of the rotor core; Multiple groups of permanent magnets, each group of the permanent magnets includes one first permanent magnet and one second permanent magnet, one permanent magnet slot corresponds to one group of the permanent magnets, the number of pole pairs of the permanent magnets is P, the width of the first permanent magnet and / or the second permanent magnet is W, the shortest distance between the first intersection and the first permanent magnet or the second permanent magnet is L1, the length of the first permanent magnet and / or the second permanent magnet is L2, 1 / P≤L1≤0.15L2, L1≤W.

[0005] In one embodiment, the permanent magnet slots are arranged in a V shape.

[0006] In one embodiment, an included angle between the first permanent magnet and the second permanent magnet in the same permanent magnet slot is α, and 100°≤α≤150°.

[0007] In one embodiment, the distance between the first intersection point and the second intersection point is L3, 0.5W<L3<W+0.2mm.

[0008] In one embodiment, 2≤P≤5.

[0009] In one embodiment, a plurality of flow holes are provided on the rotor core.

[0010] In one embodiment, a shaft hole is provided on the rotor core.

[0011] The present invention also provides an electric motor, comprising the rotor as described above.

[0012] The present invention also provides a compressor, comprising the motor as described above.

[0013] The present invention also provides a refrigeration device, comprising the compressor as described above.

[0014] The rotor in the technical solution of the present invention includes a rotor core and multiple groups of permanent magnets. The rotor core is provided with multiple permanent magnet slots at intervals. The intersection of the symmetry line of the permanent magnet slot and the permanent magnet slot wall is defined as the first intersection and the second intersection. The first intersection is located on the side of the second intersection close to the outer peripheral wall of the rotor core. Each group of permanent magnets includes a first permanent magnet and a second permanent magnet. One permanent magnet slot corresponds to one group of permanent magnets. The number of pole pairs of the permanent magnet is P, the width of the first permanent magnet and / or the second permanent magnet is W, the shortest distance between the first intersection and the first permanent magnet or the second permanent magnet is L1, the length of the first permanent magnet and / or the second permanent magnet is L2, 1 / P≤L1≤0.15L2, L1≤W. Among them, by reasonably setting the relevant dimensions of L1, L2 and W, the end of the first permanent magnet and / or the second permanent magnet toward the first intersection is further away from the symmetry line of the permanent magnet slot, thereby alleviating the influence of the demagnetization magnetic field generated by the motor current on the permanent magnet, thereby enhancing the anti-demagnetization performance of the rotor; at the same time, compared with the prior art solution by increasing the thickness of the permanent magnet, the technical solution of the present invention is to reduce the amount of permanent magnets compared with the prior art solution by adjusting the positional relationship between the permanent magnet slot and the permanent magnet, thereby reducing the production cost of the rotor and improving the cost performance of the rotor. Among them, if L1≤1 / P, it means that the end of the first permanent magnet and / or the second permanent magnet facing the first intersection is too close to the symmetry line of the permanent magnet slot, which causes the demagnetization magnetic field generated by the motor current to have a greater impact on the permanent magnet, thereby reducing the anti-demagnetization ability of the rotor. If L1>0.15L2 and / or L1>W, it means that the first permanent magnet and the second permanent magnet are too far away from the first intersection, resulting in a larger gap around the symmetry line of the permanent magnet slot, which means that the proportion of the permanent magnet in the rotor core will be relatively reduced, resulting in a decrease in the utilization rate of the permanent magnet; this means that in order to obtain the same magnetic flux, more permanent magnet material may need to be used, thereby increasing the cost; at the same time, the increase in L1 may cause the magnetic circuit between the permanent magnets to become discontinuous, increasing the possibility of magnetic leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0016] Figure 1 A schematic structural diagram of a rotor embodiment provided by the present invention; Figure 2 A schematic structural diagram of another embodiment of a rotor provided by the present invention; Figure 3 A schematic diagram of the structure of an embodiment of a motor provided by the present invention; Figure 4 A schematic diagram of the structure of an embodiment of a refrigeration device provided by the present invention; Figure 5 It is the demagnetization rate of L1 of the rotor in the present invention at different values.

[0017] Description of Figure Numbers: 1. Motor; 11. Rotor core; 111. Permanent magnet slot; 112. Through hole; 113. Shaft hole; 12. Permanent magnet; 121. First permanent magnet; 122. Second permanent magnet; 20. Stator; A. First intersection; B. Second intersection.

[0018] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0021] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0022] Reference Figure 1 , Figure 2 as well as Figure 5 The present invention provides a rotor, comprising: A rotor core 11, wherein a plurality of permanent magnet slots 111 are arranged at intervals on the rotor core 11, and intersections of a symmetry line of the permanent magnet slots 111 and slot walls of the permanent magnet slots 111 are defined as a first intersection A and a second intersection B, wherein the first intersection A is located on a side of the second intersection B close to an outer peripheral wall of the rotor core 11; A plurality of groups of permanent magnets 12, each group of the permanent magnets 12 includes a first permanent magnet 121 and a second permanent magnet 122, one permanent magnet slot 111 corresponds to a group of the permanent magnets 12, the number of pole pairs of the permanent magnets 12 is P, the width of the first permanent magnet 121 and / or the second permanent magnet 122 is W, the shortest distance between the first intersection A and the first permanent magnet 121 or the second permanent magnet 122 is L1, the length of the first permanent magnet 121 and / or the second permanent magnet 122 is L2, 1 / P≤L1≤0.15L2, L1≤W.

[0023] The rotor in the technical solution of the present invention includes a rotor core 11 and multiple groups of permanent magnets 12. The rotor core 11 is provided with multiple permanent magnet slots 111 at intervals. The intersection of the symmetry line of the permanent magnet slot 111 and the slot wall of the permanent magnet slot 111 is defined as a first intersection A and a second intersection B. The first intersection A is located on the side of the second intersection B close to the outer peripheral wall of the rotor core 11. Each group of permanent magnets 12 includes a first permanent magnet 121 and a second permanent magnet 122. One permanent magnet slot 111 corresponds to one group of permanent magnets 12. The number of pole pairs of the permanent magnet 12 is P, the width of the first permanent magnet 121 and / or the second permanent magnet 122 is W, the shortest distance between the first intersection A and the first permanent magnet 121 or the second permanent magnet 122 is L1, and the length of the first permanent magnet 121 and / or the second permanent magnet 122 is L2, 1 / P≤L1≤0.15L2, L1≤W. Among them, by reasonably setting the relevant dimensions of L1, L2 and W, the first permanent magnet 121 and / or the second permanent magnet 122 are made to be further away from the symmetry line of the permanent magnet slot 111 at one end toward the first intersection A, thereby alleviating the influence of the demagnetizing magnetic field generated by the current of the motor 1 on the permanent magnet 12, thereby enhancing the anti-demagnetization performance of the rotor; at the same time, compared with the prior art solution by increasing the thickness of the permanent magnet 12, the technical solution of the present invention is to reduce the amount of the permanent magnet 12 by adjusting the positional relationship between the permanent magnet slot 111 and the permanent magnet 12, thereby reducing the production cost of the rotor and improving the cost performance of the rotor. Reference Figure 5 It can be seen that the demagnetization rate of L1 at 0.12L2 is significantly lower than the demagnetization rate at L1=0. Wherein L1 represents the shortest distance between the first intersection A and the first permanent magnet 121 or the second permanent magnet 122, that is, a measurement point of the first permanent magnet 121 or the second permanent magnet 122 closest to the first intersection A is selected, and then the distance between the first intersection A and the measurement point is measured as L1. Since the first permanent magnet 121 and the second permanent magnet 122 are arranged at a non-180° angle in the technical solution of the present application, the measurement point is located at the corner of the first permanent magnet 121 and the second permanent magnet 122 closest to the first intersection.

[0024] Among them, the measurement method of L2 is: select the center point of one end face of the first permanent magnet 121 in the length direction as the starting point, the center point is the intersection of the diagonals of the four corners of the end face, select the center point of the other end face of the first permanent magnet 121 in the length direction as the end point, and the distance between the starting point and the end point is L2. The second permanent magnet 122 is similar, and the length and width of the first permanent magnet 121 and the second permanent magnet 122 are consistent without considering the process error.

[0025] The measurement method of W is: select the center point of one side wall of the first permanent magnet 121 in the width direction as the starting point, the center point is the intersection of the diagonals of the four corners of the side wall, and select the center point of the other side wall in the width direction of the first permanent magnet 121 as the end point, where the distance between the starting point and the end point is W.

[0026] Wherein, if L1≤1 / P, it means that the end of the first permanent magnet 121 and / or the second permanent magnet 122 facing the first intersection A is too close to the symmetry line of the permanent magnet slot 111, so that the demagnetization magnetic field generated by the current of the motor 1 has a greater impact on the permanent magnet 12, thereby reducing the anti-demagnetization ability of the rotor, and if L1>0.15L2 and / or L1>W, it means that the distance between the first permanent magnet 121 and the second permanent magnet 122 and the first intersection A is too far, resulting in a larger gap around the symmetry line of the permanent magnet slot 111, which means that the proportion of the permanent magnet 12 in the rotor core 11 will be relatively reduced, resulting in a reduction in the utilization rate of the permanent magnet 12; this means that in order to obtain the same magnetic flux, more permanent magnet 12 materials may need to be used, thereby increasing the cost; at the same time, the increase of L1 may cause the magnetic circuit between the permanent magnets 12 to become discontinuous, increasing the possibility of magnetic leakage. Wherein, the units of L1, L2 and W are all millimeters, that is, mm.

[0027] It is understandable that the material of the permanent magnet 12 is usually a rare earth material such as neodymium iron boron, aluminum nickel cobalt, ferrite and rare earth cobalt. These rare earth materials usually have high magnetic properties, can generate a strong magnetic field, and have good stability under appropriate conditions, and can maintain their magnetic properties for a long time. At the same time, their magnetic parameters such as residual magnetic density, coercive force and magnetic energy product are usually high, so they are widely used in the fields of permanent magnets 12, but the price of these rare earth permanent magnets 12 is generally high, and in the production and manufacturing cost of the motor 1, the cost of the permanent magnet 12 accounts for a high proportion. Therefore, by reducing the amount of permanent magnets 12, the production and manufacturing cost of the motor 1 and the rotor can be greatly reduced.

[0028] In one embodiment, the permanent magnet slot 111 is arranged in a V-shape. The V-shaped permanent magnet slot 111 increases the contact area between the permanent magnet 12 and the air gap, so that the magnetic flux can pass through the air gap more easily, thereby improving the utilization rate of the magnetic flux; this helps to increase the output torque of the motor 1 and improve the overall performance of the motor 1. At the same time, the gap of the V-shaped permanent magnet slot 111 is conducive to the circulation of air, thereby improving the heat dissipation performance of the motor 1, thereby reducing the operating temperature of the motor 1, and then helping to improve the reliability and service life of the motor 1. Of course, in other embodiments, the permanent magnet slot 111 can also be a straight line shape, a U shape, etc.

[0029] Specifically, the angle between the first permanent magnet 121 and the second permanent magnet 122 in the same permanent magnet slot 111 is α, 100°≤α≤150°. When the angle between the first permanent magnet 121 and the second permanent magnet 122 is between 100° and 150°, the magnetic lines of force can be effectively guided so that the magnetic flux of the permanent magnet 12 can be more evenly distributed in the entire air gap, thereby helping to reduce leakage flux and magnetic resistance and improve the utilization rate of the permanent magnet 12. A reasonable angle α helps to balance the working point of the permanent magnet 12 and avoid the occurrence of local demagnetization; at the same time, it can also increase the magnetic flux of the permanent magnet 12 to a certain extent, further improving the anti-demagnetization performance of the motor 1. Secondly, when the angle between the first permanent magnet 121 and the second permanent magnet 122 is between 100° and 150°, it can also ensure that the rotor core 11 has sufficient high structural strength and precision, thereby meeting the stable operation requirements of the motor 1. Finally, by adjusting the angle α, the electromagnetic performance of the motor 1 can be optimized and the generation of harmonics and electromagnetic noise can be reduced, which helps to improve the running quality and service life of the motor 1, and also improves the user experience. The angle α is measured by selecting the first permanent magnet 121 and the second permanent magnet 122 located in the same permanent magnet slot 111, and then selecting the two corners at the same position of the first permanent magnet 121 and the second permanent magnet 122 as the first straight line and the second straight line respectively, and then extending the first straight line and the second straight line to intersect, and then measuring the angle between the first straight line and the second straight line as α.

[0030] Furthermore, if α>150°, the magnetic circuit between the permanent magnets 12 will become discontinuous, which will increase the possibility of magnetic leakage and reduce the effective magnetic flux of the permanent magnets 12, thereby affecting the output torque and efficiency of the motor 1. At the same time, an excessively large angle α may have an adverse effect on the structural strength of the rotor core 11. When rotating at high speed or bearing a large load, the rotor may be deformed or damaged, affecting the stability and service life of the motor 1. If α<100°, the magnetic flux of the permanent magnet 12 cannot be evenly distributed in the entire air gap, which will cause the local magnetic flux density to be too high or too low, affecting the electromagnetic performance and output characteristics of the motor 1. At the same time, an excessively small angle α will cause the working point of the permanent magnet 12 to deviate from the optimal range, increase the risk of local demagnetization, thereby reducing the anti-demagnetization performance of the motor 1, and further reducing the efficiency of the motor 1. And α is within the larger range of 100° to 150°, thereby reducing the production and processing precision requirements of the first permanent magnet 121 and the second permanent magnet 122, thereby reducing the production difficulty of the rotor, and further reducing the production cost of the rotor.

[0031] In one embodiment, the distance between the first intersection A and the second intersection B is L3, 0.5W<L3<W+0.2mm. By reasonably setting the relationship between L3 and the width W of the permanent magnet 12, the arrangement of the permanent magnet 12 in the permanent magnet slot 111 is neither too compact nor too loose, which helps to optimize the magnetic circuit design, which helps to reduce magnetic leakage, increase the magnetic flux density, and thus enhance the output power and efficiency of the motor. At the same time, the distance between the permanent magnet 12 and the permanent magnet slot 111 is moderate, which helps to reduce magnetic leakage and protect the permanent magnet 12 from excessive influence of the demagnetization magnetic field. If L3>W+0.2mm, the arrangement of the permanent magnet 12 in the permanent magnet slot 111 will become too loose, which will cause the air gap in the magnetic circuit to increase, thereby reducing the magnetic flux density, and thereby reducing the output power and efficiency of the motor 1. At the same time, an excessively large L3 value may also increase the possibility of magnetic leakage, because the distance between the permanent magnet 12 and the wall of the permanent magnet slot 111 increases, causing some magnetic lines of force to bypass the stator 20 winding and directly close through the air gap, further reducing the performance of the motor. Finally, an excessively large L3 will cause the width of the permanent magnet slot 111 to be too large, thereby reducing the structural strength of the rotor core 11, and increasing the possibility of deformation of the rotor core 11 during operation, thereby reducing the service life of the rotor core 11. If L3 is less than 0.5W, the friction between the permanent magnet 12 and the wall of the permanent magnet slot 111 will increase, which will increase the energy consumption and wear of the motor 1 during operation and reduce the overall performance and durability. Among them, the unit of L3 is millimeter mm.

[0032] In one embodiment, 2≤P≤5. When the number of pole pairs of the permanent magnet 12 is in the range of 2 to 5, the magnetic flux density of the rotor of the motor 1 is maintained in a good range, thereby ensuring the torque and output power of the motor 1. Furthermore, a larger number of pole pairs usually means that the speed of the motor 1 is relatively low, which helps to reduce vibration and noise during operation and improve the operating stability of the motor 1. At the same time, appropriately increasing the number of pole pairs helps to reduce the thickness of the stator and rotor yoke of the motor 1, thereby saving materials and reducing the volume and weight of the motor 1. Secondly, the permanent magnet motor 1 with a pole pair number between 2 and 5 is relatively simple in design and manufacturing, thereby reducing the difficulty and cost of producing the rotor and the motor 1.

[0033] In one embodiment, the rotor core 11 is provided with a shaft hole 113 and a plurality of flow holes 112, and the plurality of flow holes 112 are arranged at intervals around the outer periphery of the shaft hole 113. The shaft hole 113 is used to install the transmission shaft, thereby driving the transmission object to rotate; after the motor 1 is used for a long time, its temperature is likely to rise, which is likely to cause the permanent magnet 12 to demagnetize, thereby causing the permanent magnet 12 to lose its magnetism or reduce its magnetism. Therefore, in this embodiment, by providing the flow hole 112 on the rotor core 11, a coolant flows in the flow hole 112, and the temperature of the rotor core 11 can be reduced by the coolant, thereby maintaining the temperature and performance of the permanent magnet 12 within the optimal range, thereby improving the performance and service life of the motor 1. Among them, the plurality of flow holes 112 are arranged around the outer periphery of the shaft hole 113, so that the coolant can evenly dissipate heat from the rotor core 11, thereby further reducing the temperature of the rotor core 11, thereby improving the performance and service life of the rotor core 11.

[0034] The rotor core 11 is composed of a plurality of rotor punchings stacked in sequence. By setting the rotor core 11 as a plurality of rotor punchings, when processing the rotor core 11, only a plurality of rotor punchings need to be processed, and then the plurality of rotor punching parts are assembled into a rotor core. Compared with processing a complete rotor core 11, the difficulty of processing the rotor punching parts is reduced, and it is convenient to realize the automated production of the rotor core 11 through an automated production line, thereby reducing the production cost.

[0035] Reference Figure 3 The present invention further proposes a motor 1, which includes a stator 20 and a rotor. The specific structure of the rotor refers to the above embodiment. Since the motor 1 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0036] Reference Figure 4 The present invention further proposes a compressor, which includes a motor 1. The specific structure of the motor 1 refers to the above embodiment. Since the compressor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0037] The present invention also proposes a refrigeration device, wherein the refrigeration device can be divided into a compression refrigeration device, an absorption refrigeration device, a steam jet refrigeration device, a heat pump refrigeration device and an electric refrigeration device. The refrigeration device mainly includes a compressor, an electronic expansion valve, an evaporator, a condenser and accessories, and pipelines. Such as a refrigerator, an air conditioner, etc. The specific structure of the compressor refers to the above embodiment. Since the refrigeration device in the present invention adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0038] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A rotor, characterized in that: include: A rotor core, wherein a plurality of permanent magnet slots are arranged at intervals on the rotor core, and intersections of symmetry lines of the permanent magnet slots and slot walls of the permanent magnet slots are defined as a first intersection and a second intersection, wherein the first intersection is located on a side of the second intersection close to an outer peripheral wall of the rotor core; and Multiple groups of permanent magnets, each group of the permanent magnets includes one first permanent magnet and one second permanent magnet, one permanent magnet slot corresponds to one group of the permanent magnets, the number of pole pairs of the permanent magnets is P, the width of the first permanent magnet and / or the second permanent magnet is W, the shortest distance between the first intersection and the first permanent magnet or the second permanent magnet is L1, the length of the first permanent magnet and / or the second permanent magnet is L2, 1 / P≤L1≤0.15L2, L1≤W.

2. The rotor according to claim 1, characterized in that The permanent magnet slot is arranged in a V shape.

3. The rotor according to claim 2, characterized in that The included angle between the first permanent magnet and the second permanent magnet in the same permanent magnet slot is α, and 100°≤α≤150°.

4. The rotor according to claim 1, characterized in that The distance between the first intersection point and the second intersection point is L3, 0.5W<L3<W+0.2mm.

5. The rotor according to claim 1, characterized in that 2≤P≤5。 6. The rotor according to claim 1, characterized in that The rotor core is provided with a plurality of flow holes.

7. The rotor according to claim 1, characterized in that The rotor core is provided with a rotating shaft hole.

8. A motor, characterized in that: A rotor comprising any one of claims 1 to 7.

9. A compressor, characterized in that: Comprising the motor as claimed in claim 8.

10. A refrigeration device, characterized in that: Comprising the compressor of claim 9.

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