Scroll compressor
By setting asymmetrically distributed pins in the scroll compressor and increasing the number of pins and annular components, the vibration and noise problems of scroll compressors in electric vehicles are solved, lower vibration and noise emissions are achieved, and silent operation capabilities are improved.
Patent Information
- Application Number
- CN202380056767.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2022-08-02
- Filing Date
- 2023-06-23
- Publication Date
- 2025-03-07
AI Technical Summary
The existing scroll compressors are more prominent in electric vehicles due to vibration and structural noise propagation. Although the existing technology such as the pin ring system reduces vibration and noise through damping support, it still needs further improvement.
By providing a plurality of pins on the housing middle wall of the scroll compressor and the volumetric spiral, the pins are distributed asymmetrically to form irregular polygonal inner corners to reduce resonance and vibration. Meanwhile, the number of pins and the number of associated annular elements are increased to further reduce noise emissions.
The vibration and noise emissions of the scroll compressor are significantly reduced and its silent operation capability in electric vehicles is improved.
Smart Images
Figure CN119585506A_ABST
Abstract
Description
describe
[0001] The invention relates to a scroll compressor according to the preamble of claim 1. The invention also relates to a vehicle air conditioning system and a motor vehicle having such a scroll compressor.
[0002] For example, a scroll compressor of the above-mentioned type is known from DE 10 2019 108 417 A1. The document describes a scroll compressor which is particularly suitable for electric vehicles. The problem with electric vehicles is that, due to the omission of the internal combustion engine used in conventional vehicles, the noise from the auxiliary units becomes more prominent. These noises are mainly caused by the structure-borne noise of the auxiliary units. This particularly concerns the compressors of the vehicle air conditioning system, which can be heard in electric vehicles of conventional structural design and can also be felt due to compressor vibrations. It is therefore necessary to reduce the vibrations and structure-borne noise generated by the auxiliary units, in particular the scroll compressor. To this end, the above-mentioned DE 10 2019 108 417 A1 provides a solution in which the rings of the so-called pin-ring system (Pin-Ring-System) that guide the orbiting positive displacement spiral are supported in a damping manner by a lubricant. Although the damping support has already significantly reduced vibration and noise emissions, further improvements are still needed.
[0003] In the known pin-and-ring system, the pins engaged in the ring are arranged to form a regular polygon. The polygon has the same internal angles, which can be calculated according to the following formula: (Equation 1) Against this background, the object of the present invention is to provide a scroll compressor which offers further improvements in terms of low-vibration and low-noise operation. Another object of the present invention is to provide a vehicle air conditioning system and a motor vehicle having such a scroll compressor.
[0004] According to the invention, the object with respect to the scroll compressor is solved by the subject matter of claim 1 , the object with respect to the vehicle air conditioning system is solved by the subject matter of claim 8 , and the object with respect to the motor vehicle is solved by the subject matter of claim 9 .
[0005] Therefore, the present invention is based on the following conception: provide a scroll compressor, the scroll compressor comprises a housing with a housing cover and a housing intermediate wall, and also comprises an electric drive unit, the electric drive unit is connected to an eccentric bearing by a drive shaft with an axis, and is also provided with a movable positive displacement spiral connected to the eccentric bearing rotatably around the eccentric axis and an immovable reverse spiral engaged with the positive displacement spiral. In the scroll compressor, the housing intermediate wall and the positive displacement spiral are arranged on the suction side, and the housing cover and the reverse spiral are arranged on the high pressure side. A plurality of cylindrical grooves are formed on the side of the positive displacement spiral facing the suction side. The pin is arranged on the side of the housing intermediate wall facing the high pressure side so that the pin extends into the cylindrical groove and interacts with the cylindrical groove, thereby forming a guide device for the movable positive displacement spiral. Preferably, an annular element around the pin is arranged in each cylindrical groove.
[0006] According to the invention, the pin spans an imaginary polygon, wherein at least one interior angle of the polygon differs from another of the interior angles and / or differs from 120°. In particular, in a variant according to the invention, in which one interior angle differs from at least one other interior angle, the above equation 1 does not hold.
[0007] Therefore, in the present invention, the pins are basically asymmetrically distributed. It has been shown that this asymmetrical distribution of the pins leads to an excessive reduction in resonance or vibration. The noise emission of the scroll compressor is significantly reduced. Therefore, the scroll compressor is particularly suitable as a silent running unit for a vehicle air conditioning system of an electric vehicle.
[0008] Furthermore, in today's motor vehicles, the switch from internal combustion engines to electric drives has resulted in a saving of installation space in the vehicle. Electric motors require less installation space than internal combustion engines, so that the auxiliary units can be designed to be larger. The installation space now available also allows the use of larger scroll compressors, so that the number of pins and associated annular elements can be increased. In particular, not only three, four or five pins can be provided. Rather, it is conceivable to provide seven, eight, nine or more pins. The increase in the number of pins also directly leads to smoother operation, which further reduces noise emissions.
[0009] In a preferred embodiment of the invention, the groove and / or the pin (in particular the annular element) is provided with and / or contacts a non-metallic material, preferably a plastic. In this way, vibrations are additionally reduced, in particular when the non-metallic material has damping properties. Suitable plastics can well achieve such damping.
[0010] In a scroll compressor, it can also be provided that a pair of adjacent pins spans a pin pair angle around the axis of the drive shaft, wherein the pin pair angle of one pair is different from the pin pair angle of at least another pair. In particular, the pin pair angle of one pair can 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% greater and / or smaller than the pin pair angle of at least another pair.
[0011] Furthermore, it can be provided that the pins are arranged around the axis of the drive shaft on at least two pitch circles of different diameters. In particular, the second pitch circle can 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 subtending angles and / or different pitch circles lead to an asymmetrical arrangement of the pins, which has proven to be particularly vibration-damping in practice. This special arrangement of the pins and the associated recesses contributes to a significant reduction in noise emissions.
[0012] In another preferred embodiment, the scroll compressor has a stator around the drive shaft (especially with twelve stator slots), a rotor with (especially ten) rotor pole pairs and preferably seven pins. This configuration has proven to be particularly effective in reducing vibrations and noise emissions.
[0013] In this case, it is particularly advantageous if the number of stator slots or rotor pole pairs can only be divided by the number of pins with a remainder.
[0014] Alternatively, the stator has 12 stator slots and the rotor has 8 rotor pole pairs.
[0015] A parallel aspect of the invention relates to a vehicle air conditioning system having a scroll compressor as described above. A further parallel aspect relates to a motor vehicle having such a vehicle air conditioning system. Preferably, the motor vehicle may have an at least partially electric vehicle drive.
[0016] The present invention will be described in more detail below based on embodiments and with reference to the accompanying schematic diagrams. In the accompanying drawings: Figure 1 shows a longitudinal cross-sectional view of a scroll compressor according to the present invention according to a preferred embodiment; Figure 2 Shown according to Figure 1 A cross-sectional view of a movable positive displacement spiral of a scroll compressor according to the invention, wherein the pins are arranged on pitch circles having different diameters; Figure 3 shows a cross-sectional view of a positive displacement spiral of a scroll compressor according to the present invention according to another embodiment, wherein a pin spans a polygon having different internal angles; Figure 4 shows a cross-sectional view of a positive displacement scroll of a scroll compressor according to the present invention having four pins spanning a polygon having different internal angles; Figure 5 A cross-sectional view showing a positive displacement spiral of a scroll compressor according to the present invention according to another preferred embodiment, wherein four pins are provided, one of the four pins being arranged on a different pitch diameter; and Figure 6 A cross-sectional view of a positive displacement spiral of a scroll compressor according to the present invention is shown according to another preferred embodiment, wherein four pins are provided spanning a polygon having internal angles each different from 120°.
[0017] Figure 1 A scroll compressor 10 is shown, which has a housing 11 with a housing cover 12 and a housing intermediate wall 13. The housing intermediate wall 13 extends over the inner diameter of the housing 10.
[0018] An electric drive unit 21 is arranged in the housing 10, which comprises an electric motor having a stator 32 and a rotor 33. The rotor 33 is connected to the drive shaft 22 in a rotationally fixed manner. The drive shaft 22 extends through the housing intermediate wall 13 and has an axis A. The drive shaft 22 is also connected to an eccentric bearing 23 via an eccentric bolt 24. The eccentric bearing 23 comprises an axis EA, which is arranged eccentrically relative to the axis A of the drive shaft 22 and is therefore referred to as an eccentric axis EA.
[0019] The eccentric bearing 23 is fastened in the positive displacement screw 14 so that the eccentric bearing 23 carries the positive displacement screw 14. The positive displacement screw 14 is movable and engages in a counter-screw 15 which is immovable.
[0020] The scroll compressor 10 generally comprises a high-pressure side HD and a suction side SA. A positive displacement spiral 14 separates the suction side SA, in which the drive unit 21 is also arranged, from the high-pressure side HD, which mainly comprises a reverse spiral 15.
[0021] A plurality of cylindrical grooves 16 are formed on the side of the positive displacement spiral 14 facing the suction side SA. Figure 1As can be clearly seen in the drawing, a ring element 18 is embedded in each groove 16. The ring element 18 essentially forms a cylindrical sliding surface for the pin 17, which engages in the groove 16. In general, a plurality of pins 17 are provided, which are connected to the housing intermediate wall 13 in a rotationally fixed manner and engage in the groove 16 so that they are guided along the inner surface of the ring 18. This combination of pins 17 and ring elements 18 forms a guide for the positive displacement screw 14, thereby ensuring that the positive displacement screw 14 performs an orbiting movement due to the eccentric push via the eccentric bearing 23.
[0022] Figure 2 A cross-sectional view is shown in which a pin 17 is arranged in a groove 16 in a positive displacement spiral 14. In particular, a cross-sectional view of a positive displacement spiral 14 is shown. In addition, a dashed line indicates the housing intermediate wall 13 which is located behind the positive displacement spiral 14 in the view. It can be seen that the positive displacement spiral 14 slides eccentrically on the housing intermediate wall 13.
[0023] For all embodiments, the pin 17 spans an imaginary polygon P, which is symbolically shown in the various figures. The polygon P includes internal angles W1, W2, W3, W4, W5, W6. In each case, two adjacent pins 17 form a pair 26 to 31, wherein each pair spans a pin pair angle S1 to S6 around the axis A of the drive shaft 22. The corners of the polygon P are respectively located on the center axis MS of the pin 17.
[0024] The same applies to the embodiment in which the pin is arranged eccentrically in the corresponding groove. In particular, the pin 17 slides along the inner wall of the ring element 18 arranged in the groove 16. In this respect, the groove 16 has a center axis MA, which is preferably arranged parallel to the center axis of the pin 17 in any state of the scroll compressor, but does not coincide with the center axis of the pin 17.
[0025] according to Figures 2 to 6 The embodiments differ in the specific number and arrangement of the pins 17.
[0026] Therefore, according to Figure 2 In the embodiment of the invention, five of the six pins 17 are arranged on a first pitch circle T1 with a first diameter, while the sixth pin 17 is arranged on a second pitch circle T2 with a second diameter. The second diameter is greater than the first diameter. As a result of this arrangement, the polygon P (here a hexagon) is no longer regular, but has different internal angles W1 to W6. In particular, the internal angles W1, W2 and W6 are greater than the internal angles W3, W4, W5.
[0027] The pin angles S1 to S6 can be the same. Therefore, it can be basically provided that the pins 17 located on the pitch circle T2 form a symmetry line of the remaining four pins 17 with the pins 17 on the opposite pitch circle T1. However, in general, there is an asymmetry because the pins 17 are not all arranged on the same pitch circles T1, T2. This type of asymmetry brings the advantage according to the invention, namely reducing the vibration and structure-borne noise transmission during the operation of the scroll compressor.
[0028] In accordance with Figure 3 In the embodiment of , six pins 17 are also provided. The pins 17 are arranged on the same pitch circle T. But they span the irregular polygon P because the pin pair angles S1-S6 are different. Therefore, two pins 17 form a pin pair 26, which spans a first pin pair angle S1 around the axis A of the drive shaft 22. For example, the first pin pair angle S1 is greater than the pin pair angle S4, which is spanned by the opposite pin pair 29 around the axis A of the drive shaft 22. This asymmetric arrangement of the pins 17 also shows a significant reduction in the vibration and noise emissions of the scroll compressor.
[0029] In accordance with Figure 4 In the embodiment of FIG. 1 , four pins 17 are provided, which are guided into corresponding four grooves 16. The pins 17 span the irregular polygon P with their center axis MS. In particular, the polygon P forms an irregular quadrilateral. It can be seen that in accordance with Figure 4 In the embodiment of the present invention, all pins 17 are arranged on the same pitch circle T. However, some of the pin pairs 26 to 29 have different pin pair angles S1 to S4. In particular, the first pin pair 26 and the axis A of the drive shaft 22 span a first pin pair angle S1, which is greater than the remaining pin pair angles S2 to S4.
[0030] In accordance with Figure 5 In the embodiment of FIG. 1 , an alternative positioning of the pins 17 is shown. Here too, four pins 17 are provided, which are each guided into a groove 16. The pins 17 span an irregular quadrilateral with their center axis MS, wherein in accordance with Figure 5 In the embodiment of the present invention, the irregularity is caused by the pin 17 being arranged on a different pitch circle T2 than the remaining pins 17. Specifically, three of the pins 17 are arranged on a first pitch circle T1, wherein the first pitch circle T1 extends concentrically around the axis A of the drive shaft 22 and has a first pitch circle diameter. The second pitch circle T2 has a second pitch circle diameter greater than the first pitch circle diameter. One of the four pins 17 is arranged on the second pitch circle T2.
[0031] Figure 6An additional embodiment of a scroll compressor 10 is shown, in which the scroll compressor 10 also has four pins 17, whose central axis MS spans the polygon P. However, the polygon P is configured as a regular polygon. In particular, the polygon P is configured as a square. However, the deviation of the inner angle of the polygon P from 120° is essential for minimizing noise and reducing vibration. It has been proven that this deviation also makes the scroll compressor run more quietly. Reference Mark List
[0032] 10 Scroll compressor 11 Housing 12 Housing cover 13 Shell middle wall 14 Volumetric Screw 15 Anti-Spiral 16 grooves 17 Pins 18 Ring element 21 Drivers 22 Drive shaft 23 Eccentric bearing 24 Eccentric bolt 26-31 Pin pair 32 Stator 33 Rotor HD High voltage side SA Suction side A axis EA Eccentric axis MA Center axis of groove 16 MS Center axis of pin 17 P The polygon spanned by pin 17 S1-S6 pin angle T, T1, T2 Pitch circle around axis A W1-W6 interior angles of polygon.
Claims
1. 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) via a drive shaft (22) having an axis (A); a movable positive displacement screw (14) connected to the eccentric bearing (23) rotatably around an eccentric axis (EA); and an immovable reverse spiral member (15) engaged with the volumetric spiral member (14); wherein: The housing intermediate wall (13) and the positive displacement spiral (14) are arranged on the suction side (SA), and the housing cover (12) and the counter spiral (15) are arranged on the high pressure side (HD), A plurality of cylindrical grooves (16) are formed on a side of the positive displacement spiral (14) facing the suction side (SA), and A pin (17) is arranged on the side of the housing intermediate wall (13) facing the high pressure side (HD) so that the pin (17) projects into the cylindrical recess (16) and interacts with the cylindrical recess (16) to form a guide for the movable positive displacement screw (14), and Preferably, in each cylindrical recess (16) there is arranged an annular element (18) surrounding the pin (17), It is characterized in that The pin (17) spans an imaginary polygon (P), wherein at least one of the internal angles (W1, W2, W3, W4, W5, W6) of the polygon (P) is different from another of the internal angles (W1, W2, W3, W4, W5, W6) and / or is different from 120°.
2. The scroll compressor (10) according to claim 1, characterized in that: Three, four, five, seven, eight, nine or more pins (17) are provided.
3. The scroll compressor (10) according to claim 1 or 2, characterized in that: The groove (16) and / or the pin (17), in particular the annular element (18), are provided with and / or contact a non-metallic material, which is preferably a plastic.
4. A scroll compressor (10) according to any one of the preceding claims, characterized in that A pair (26-31) of adjacent pins (17) spans a pin pair angle (S1-S6) around the axis (A) of the drive shaft (22), wherein the pin pair angle (S1-S6) of one pair (26-31) is different from the pin pair angle (S1-S6) of at least another pair (26-31), in particular, is greater and / or smaller than the pin pair angle (S1-S6) of at least another pair (26-31) by at least 1%, 2%, 5%, 10%, 20%, 40% or 50%.
5. A scroll compressor (10) according to any one of the preceding claims, characterized in that The pins (17) are arranged around the axis (A) on at least two pitch circles (T1, T2) of different diameters, wherein in particular the second pitch circle (T2) is at least 1%, 2%, 5%, 10%, 20%, 40% or 50% larger and / or smaller than the first pitch circle (T1).
6. A scroll compressor (10) according to any one of the preceding claims, characterised in that A stator (32) surrounds the drive shaft (22), in particular a stator (32) having twelve stator slots, a rotor (33) having in particular ten rotor pole pairs, and preferably seven pins (17).
7. The scroll compressor (10) according to claim 6, characterized in that: The number of stator slots or rotor pole pairs can only be divided by the number of pins (17) with a remainder.
8. A vehicle air conditioning system, characterized in that A scroll compressor (10) according to any one of claims 1 to 7.
9. A motor vehicle, characterized in that The vehicle air conditioning system according to claim 8.
10. The motor vehicle according to claim 9, characterized in that An at least partially electric vehicle drive.
Citation Information
Patent Citations
Scroll compressor
DE102019108417A1