Scroll Compressor

Abstract

The present invention relates to a scroll compressor (10), comprising: a housing (11) having a housing cover (12) and a housing intermediate wall (13); an electric drive unit (21) connected to an eccentric bearing (23) by a drive shaft (22) having an axis (A); an operable movable spiral (14) connected to the eccentric bearing (23) so as to be rotatable about an eccentric axis (EA); and an inoperable counter spiral (15) engaged with the movable spiral (14), wherein the housing intermediate wall (13) and the movable spiral (14) are disposed on a suction side (SA), and the housing cover (12) and the counter spiral (15) are disposed on a high pressure side (HD), and a side of the movable spiral (14) facing the suction side (SA) is provided with a , a plurality of cylindrical notches (16) are formed, and pins (17) are arranged on the side of the housing intermediate wall (13) facing the high pressure side (HD) so that the pins protrude into the cylindrical notches (16) and cooperate with the notches to form guides for the operable movable spiral (14), and advantageously, one ring element (18) is arranged in each cylindrical notch (16) surrounding the pins (17), the pins (17) generating an imaginary polygon (P), at least one interior angle (W1, W2, W3, W4, W5, W6) of the polygon (P) differing from one another of the interior angles (W1, W2, W3, W4, W5, W6) and / or differing from 120°.

Description

[Technical Field]

[0001] The present invention relates to a scroll compressor according to the preamble of claim 1. Furthermore, the present invention relates to a vehicle air conditioner and a motor vehicle equipped with such a scroll compressor. [Background technology]

[0002] A scroll compressor of the aforementioned type is known, for example, from German Patent Application Publication No. 102019108417. The scroll compressor described there is particularly suitable for use in electric vehicles. A problem with electric vehicles is that, due to the omission of the combustion engine, the noise of auxiliary units used in conventional vehicles becomes more pronounced. Such noise is often caused by structure-borne noise transmission in the auxiliary units. This applies particularly to compressors in vehicle air conditioners. In conventional designs, compressors can be heard in electric vehicles and can also be felt due to their vibrations. Therefore, there is a need to reduce the vibrations and structure-borne noise generated by auxiliary units, particularly scroll compressors. German Patent Application Publication No. 102019108417 provides a solution for this purpose, in which the rings of a so-called pin-ring system guiding the orbiting spiral are supported in a lubricant-damped manner. Although damped bearings already provide a significant reduction in vibration and noise emissions, there is a need for further improvement.

[0003] In the known pin-ring system, the pins that fit into the ring are arranged so that they form a regular polygon, the interior angles of which are identical and can be defined by the following formula:

number

[0004] Against this background, it is an object of the present invention to provide a scroll compressor which provides further improvements in terms of low vibration and low noise operation, and a vehicle air conditioner and an automobile equipped with such a scroll compressor. [Means for solving the problem]

[0005] According to the invention, this problem is solved by the subject matter of claim 1 for scroll compressors, by the subject matter of claim 8 for vehicle air conditioners and by the subject matter of claim 9 for motor vehicles.

[0006] The present invention is thus based on the idea of providing a scroll compressor, the scroll compressor including a housing with a housing cover and a housing intermediate wall, and further including an electric drive unit connected to an eccentric bearing by a drive shaft having an axis, the scroll compressor including an operable movable spiral connected to the eccentric bearing so as to be rotatable about the eccentric axis, and an inoperable counter spiral engaging the movable spiral. In the scroll compressor, the housing intermediate wall and the movable spiral are arranged on the suction side, and the housing cover and the counter spiral are arranged on the high-pressure side. A plurality of cylindrical notches are formed on the side of the movable spiral facing the suction side. Pins are arranged on the side of the housing intermediate wall facing the high-pressure side so that the pins protrude into and cooperate with the cylindrical notches to form guides for the movable movable spiral. Advantageously, a ring element surrounding the pin is arranged in each of the cylindrical notches.

[0007] According to the invention, the pins generate an imaginary polygon, at least one interior angle of which differs from one another of the interior angles and / or from 120°. In particular, in the case of a variant according to the invention in which one interior angle differs from at least one other of the interior angles, equation (1) above does not apply.

[0008] In essence, the pins are distributed asymmetrically in the present invention. It has been found that this asymmetric distribution of the pins results in less excessive increases in resonance or vibration. This significantly reduces the noise emissions of the scroll compressor. The scroll compressor is thus particularly suitable as a smooth-running unit for vehicle air conditioning systems for electric vehicles.

[0009] The conversion of modern automobiles from combustion engines to electric drives also leads to a saving of structural space within the vehicle. Since electric motors require significantly less structural space than combustion engines, auxiliary units can be made larger. The now available structural space also makes it possible to use larger scroll compressors, so the number of pins and associated ring members can be increased. In particular, not only three, four, or five pins can be provided. It is also conceivable to provide seven, eight, nine, ten, or more pins. Increasing the number of pins also directly increases the smoothness of operation, which further reduces noise emissions.

[0010] In an advantageous embodiment of the invention, the notches and / or pins, in particular the ring elements, comprise and / or are in contact with a non-metallic material, preferably plastic. In this way, vibrations are further reduced, especially if the metallized material has damping properties. Suitable plastics can provide such damping well.

[0011] In the scroll compressor, pairs of adjacent pins may further form pin-pair angles about the axis of the drive shaft, the pin-pair angle of one pair being different from the pin-pair angle of at least one other pair, in particular the pin-pair angle of one pair being at least 1%, in particular at least 2%, in particular at least 5%, in particular at least 10%, in particular at least 20%, in particular at least 40%, in particular at least 50% larger and / or smaller than the pin-pair angle of at least one other pair.

[0012] Furthermore, the pins may be arranged around the axis on at least two pitch circles of different diameters. In particular, the second pitch circle may be at least 1%, in particular at least 2%, in particular at least 5%, in particular at least 10%, in particular at least 20%, in particular at least 40%, in particular at least 50% larger and / or smaller than the first pitch circle. Different pin-to-pin angles and / or different pitch circles result in an asymmetric arrangement of the pins. This arrangement has proven in practice to be particularly vibration-reducing. This special arrangement of the pins and the associated recesses significantly contributes to a reduction in noise emissions.

[0013] In a further advantageous embodiment, the scroll compressor has a stator surrounding the drive shaft, in particular having 12 stator slots, and a rotor with in particular 10 rotor pole pairs, preferably 7 pins, which has been found to be particularly effective for reducing vibration and noise emissions.

[0014] In this connection, the number of stator slots or rotor pole pairs can be divided by the number of pins only with a remainder.

[0015] Alternatively, the stator may have 12 stator slots and the rotor may have 8 rotor pole pairs.

[0016] A secondary aspect of the present invention relates to a vehicle air conditioning system including the scroll compressor described above. A further secondary aspect relates to a motor vehicle including such a vehicle air conditioning system. The motor vehicle can advantageously have an at least partially electrically powered vehicle drive.

[0017] The invention will now be described in more detail on the basis of examples with reference to the accompanying schematic drawings. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 shows a longitudinal section of a displacer machine according to the invention in accordance with an advantageous embodiment. [Figure 2] FIG. 2 is a cross-sectional view of an operable moving spiral of the scroll compressor according to the invention shown in FIG. 1, in which the pins are arranged on pitch circles with different diameters. [Figure 3] FIG. 3 is a cross-sectional view of a moving spiral of a scroll compressor according to a further embodiment of the invention, in which the pins form a polygon with different interior angles. [Figure 4] FIG. 4 is a cross-sectional view of a moving spiral of a scroll compressor according to the invention with four pins, the pins forming a polygon with different interior angles. [Figure 5] FIG. 5 shows a cross-sectional view of a moving spiral of a scroll compressor according to a further advantageous embodiment of the invention, which is provided with four pins, one of which is arranged on a different pitch diameter. [Figure 6] FIG. 6 shows a cross-sectional view of a moving spiral of a scroll compressor according to a further advantageous embodiment of the invention, which is provided with four pins, each of which forms a polygon with an interior angle different from 120°. DETAILED DESCRIPTION OF THE INVENTION

[0019] 1 shows a scroll compressor 10. The scroll compressor has a housing 11 with a housing cover 12 and a housing intermediate wall 13. The housing intermediate wall 13 extends across the inner diameter of the housing 10.

[0020] An electric drive unit 21 is disposed within the housing 10. The electric drive unit includes an electric motor having a stator 32 and a rotor 33. The rotor 33 is coupled to a drive shaft 22 so that the drive shaft 22 is non-rotatable relative to the drive shaft 22. The drive shaft 22 extends through the housing intermediate wall 13 and has an axis A. The drive shaft 22 is further coupled to an eccentric bearing 23 via an eccentric bolt 24. The eccentric bearing 23 has an axis EA. The axis EA is eccentrically disposed relative to the axis A of the drive shaft 22 and is therefore referred to as the eccentric axis EA.

[0021] The eccentric bearing 23 is fixed within the movable spiral 14, so that the eccentric bearing 23 supports the movable spiral 14. The movable spiral 14 is movable and engages within the counter spiral 15, which is inoperative.

[0022] The scroll compressor 10 generally includes a high pressure side HD and a suction side SA. A moving spiral 14 separates the suction side SA, where a drive unit 21 is also located, from the high pressure side HD, which essentially includes an opposing spiral 15.

[0023] The movable spiral 14 has a number of cylindrical notches 16 formed on its side facing the suction side SA. As can be seen in Figure 1, each of the notches 16 has a ring element 18 embedded therein. The ring element 18 essentially forms a cylindrical sliding surface for a pin 17. The pin engages in the notch 16. Overall, there are provided a number of pins 17, which are connected to the housing intermediate wall 13 so as not to rotate relative to one another and engage in the recesses 16 so as to be guided along the inner surface of the ring 18. This combination of the pins 17 and the ring member 18 forms a guide for the moving spiral 14, which is thereby guaranteed to perform an orbital movement due to the eccentric excitation of the moving spiral 14 via the eccentric bearing 23.

[0024] 2 shows in cross section the arrangement of the pins 17 inside the notches 16 of the movable spiral 14. In particular, a cross section of the movable spiral 14 is shown. A dotted line further indicates the intermediate housing wall 13, which is located behind the movable spiral 14 in the drawing. It can be seen that the movable spiral 14 slides eccentrically on the intermediate housing wall 13.

[0025] In all embodiments, the pins 17 form an imaginary polygon P. The polygon is symbolically shown in each drawing. The polygon P includes interior angles W1, W2, W3, W4, W5, and W6. Every two adjacent pins 17 form a pair 26-31. Each pair forms pin-pair angles S1-S6 about the axis A of the drive shaft 22. The corners of the polygon P are located on the central axis MS of the pins 17.

[0026] It is also true in all embodiments that the pins 17 are arranged off-center in the respective notches 16. In particular, the pins 17 slide along the inner wall of the ring member 18, which is arranged inside the notches 16. The notches 16 have central axes MA which in this respect are advantageously parallel to the central axes of the pins 17 but do not coincide with the central axes of the pins 17 in any state of the scroll compressor.

[0027] The embodiments based on FIGS. 2 to 6 differ in the specific number and arrangement of the pins 17.

[0028] For example, in the embodiment shown in Figure 2, five of the six pins 17 are arranged on a first pitch circle T1 with a first diameter, and the sixth pin 17 is arranged on a second pitch circle T2 with a second diameter T2, which is larger than the first diameter. As a result of this arrangement, the polygon P, here a hexagon, is no longer a regular polygon but has different interior angles W1 to W6.

[0029] In particular, the interior angles W1, W2 and W6 are greater than W3, W4 and W5.

[0030] The pin-to-pin angles S1-S6 may be equal. In effect, the pin 17 located on pitch circle T2, together with the opposing pin 17 on pitch circle T1, may form a line of symmetry for the remaining four pins 17. Overall, however, asymmetry exists unless the pins 17 are all located on the same pitch circles T1 and T2. This asymmetry, according to the present invention, reduces vibration and structure-borne sound transmission during operation of the scroll compressor.

[0031] In the embodiment according to FIG. 3, six pins 17 are again provided. The pins 17 are also arranged on the same pitch circle T. However, these pins form an irregular polygon P because the pin-pair angles S1 to S6 are different from one another. For example, two pins 17 form a pin pair 26 that generates a first pin-pair angle S1 about the axis A of the drive shaft 22. The first pin-pair angle S1 is greater than the pin-pair angle S4, for example, generated by the opposing pin pair 29 about the axis A of the drive shaft 22. This asymmetric arrangement of the pins 17 significantly reduces vibration and noise emissions in the scroll compressor.

[0032] In the embodiment according to FIG. 4, four pins 17 are provided. The pins are guided in four corresponding recesses 16. The central axes MS of the pins 17 form a polygon P. The polygon is an irregular polygon. In particular, the polygon P is an irregular quadrilateral. It can be seen that all pins 17 in the embodiment according to FIG. 4 are arranged on the same pitch circle T. However, the respective pin pairs 26-29 have partially different pin pair angles S1-S4. In particular, the first pin pair 26 forms a first pin pair angle S1 with the axis A of the drive shaft 22. The first pin pair angle S1 is greater than the remaining pin pair angles S2-S4.

[0033] Another position of the pins 17 is shown in the embodiment according to FIG. 5. Here, four pins 17 are provided. Each of these pins is guided in a recess 16. The central axes MS of the pins 17 form an irregular rectangle. The irregularity in the embodiment according to FIG. 5 is caused by the fact that one pin 17 is arranged on a different pitch circle T2 from the remaining pins 17. In particular, three of the pins 17 are arranged on a first pitch circle T1. The first pitch circle T1 extends concentrically about the axis A of the drive shaft 22 and has a first pitch diameter. The second pitch circle T2 has a second pitch diameter that is larger than the second pitch diameter. One of the four pins 17 is arranged on the second pitch circle T2.

[0034] 6 shows an additional embodiment of the scroll compressor 10. The scroll compressor 10 also has four pins 17. The central axes MS of these pins form a polygon P. However, the polygon P is formed as a regular polygon. In particular, the polygon P is formed as a square. However, it is crucial for noise minimization and vibration reduction that the interior angles of the polygon P deviate from 120°. It has been found that such deviations result in smoother operation of the scroll compressor. [Explanation of symbols]

[0035] 10 Scroll compressor 11. Housing 12 Housing cover 13 Housing intermediate wall 14 Moving Spiral 15 Opposing Spiral 16 Cutout 17-pin 18 Ring member 21 Drive unit 22 Drive shaft 23 Eccentric bearing 24 Eccentric bolt 26~31 pin pairs 32 Stator 33 Rotor HD high pressure side SA suction side A axis EA eccentric axis MA Center axis of notch 16 MS Pin 17 central axis P Polygon generated by pin 17 SI~S6 Pin vs. Angle T, TI, T2 Pitch circle centered on axis A W1~W6 Interior angles of a polygon

Claims

1. A scroll compressor (10), comprising: The invention comprises a housing (11) having a housing cover (12) and a housing intermediate wall (13), an electric drive unit (21) connected to an eccentric bearing (23) by a drive shaft (22) having an axis (A), an operable moving spiral (14) connected to the eccentric bearing (23) so as to be rotatable about an eccentric axis (EA), and an inoperable counter spiral (15) engaged with the moving spiral (14), The housing intermediate wall (13) and the moving spiral (14) are arranged on the suction side (SA), and the housing cover (12) and the opposing spiral (15) are arranged on the high pressure side (HD), The moving spiral (14) has a plurality of cylindrical notches (16) formed on its side facing the suction side (SA), and The pin (17) is arranged on the side of the housing intermediate wall (13) facing the high pressure side (HD) so that it projects into the cylindrical notch (16) and cooperates with it to form a guide for the operable moving spiral (14), and advantageously: In the cylindrical recess (16), a ring element (18) is disposed, surrounding the pin (17), The scroll compressor (10) is characterized in that the pins (17) generate an imaginary polygon (P), and at least one interior angle (W1, W2, W3, W4, W5, W6) of the polygon (P) is different from another interior angle of one of the interior angles (W1, W2, W3, W4, W5, W6) and / or is different from 120°.

2. 2. The scroll compressor (10) of claim 1, characterized in that there are provided 3, 4, 5, 7, 8, 9, or 10 or more pins (17).

3. 3. The scroll compressor (10) according to claim 1 or 2, characterized in that the notches (16) and / or the pins (17), in particular the ring members (18), comprise and / or are in contact with a non-metallic material, preferably plastic.

4. 4. The scroll compressor (10) according to claim 1, wherein pairs (26-31) of adjacent pins (17) form pin-pair angles (S1-S6) about the axis (A) of the drive shaft (22), and the pin-pair angle (S1-S6) of one pair (26-31) is different from the pin-pair angle (S1-S6) of at least one other pair (26-31), in particular by at least 1%, 2%, 5%, 10%, 20%, 40% or 50% greater and / or smaller.

5. 5. The scroll compressor (10) according to claim 1, wherein the pins (17) are arranged around the axis (A) on at least two pitch circles (T1, T2) of different diameters, in particular the second pitch circle (T2) being at least 1%, 2%, 5%, 10%, 20%, 40% or 50% larger and / or smaller than the first pitch circle (T1).

6. 6. The scroll compressor (10) according to claim 1, further comprising a stator (32) surrounding the drive shaft (22), in particular having 12 stator grooves, a rotor (33) with 10 rotor pole pairs, and preferably seven of the pins (17).

7. 7. A scroll compressor (10) according to claim 6, characterized in that the number of stator slots or rotor pole pairs can be divided by the number of said pins (17) only with a remainder.

8. An air conditioning system for a vehicle, comprising a scroll compressor (10) according to any one of claims 1 to 7.

9. 9. A motor vehicle comprising the vehicle air conditioning system according to claim 8.

10. 10. The motor vehicle according to claim 9, characterized in that it is provided with an at least partially electrically powered vehicle drive.

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