Spiral and spiral compressors with such a spiral
By employing involutes to offset spiral turn surfaces towards the center, the sealing quality between spiral turns is improved, addressing inefficiencies and leakage in spiral compressors.
Patent Information
- Authority / Receiving Office
- DE · DE
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-04-19
- Publication Date
- 2026-04-02
AI Technical Summary
Existing spiral compressors face challenges in maintaining effective sealing between the spiral turns due to manufacturing defects and deformation during use, leading to inefficiencies and increased leakage.
The design of the spiral involves using involutes as references for generating the outer and inner surfaces of the spiral turns, with distances between these surfaces and the involutes increasing gradually to offset them towards the center, thereby minimizing gaps and improving sealing.
This design ensures near-zero gaps at contact sealing sections, enhancing the sealing effect between spiral turns and reducing leakage, even under varying pressure conditions.
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Abstract
Description
Technical field
[0001] The present invention relates to a spiral for a spiral compressor and a spiral compressor with such a spiral. background
[0002] A spiral compressor has a first spiral and a second spiral, wherein the first spiral and the second spiral form a plurality of sealed compression chambers. Summary of the invention
[0003] The purpose of the embodiments of the present invention is to provide a spiral for a spiral compressor and a spiral compressor with such a spiral, for example to improve the sealing quality between the spiral turns of the first spiral and the second spiral.
[0004] According to one embodiment of the present invention, a spiral for a spiral compressor is provided, comprising: an end plate; a spiral projecting axially from the end plate, wherein the spiral has an inner surface and an outer surface opposite each other in the thickness direction of the spiral, wherein at least one of the outer surface or the inner surface of the spiral uses an involute as a reference to generate the at least one of the outer or inner surfaces, wherein from a predetermined point between the start point and the end point of the involute to the end point of the involute, a distance between the at least one outer surface or inner surface of the spiral turn and the involute gradually increases along the generating line of the involute, thereby gradually displacing the at least one outer surface or inner surface of the spiral turn towards the center in the thickness direction of the spiral turn.
[0005] According to embodiments of the present invention, the outer surface of the spiral winding uses a first involute as a reference for generating the outer surface, wherein from a predetermined point between the start point and the end point of the first involute to the end point of the first involute, a distance between the outer surface of the spiral winding and the first involute gradually increases along the generating line of the first involute, thereby gradually displacing the outer surface of the spiral winding towards the center in the thickness direction of the spiral winding;and / or the inner surface of the spiral turn has a second involute with respect to generating the inner surface, wherein from a predetermined point between the start point and the end point of the second involute to the end point of the second involute, a distance between the inner surface of the spiral turn and the second involute gradually increases along the generating line of the second involute, causing the inner surface of the spiral turn to be gradually displaced in the thickness direction towards the center of the spiral turn.
[0006] According to embodiments of the present invention, the predetermined point on the involute lies between the starting point of the involute and a point on the involute that is generated when the generating line of the involute is rotated 360 degrees from the starting point of the involute.
[0007] According to one embodiment of the present invention, the predetermined point on the involute is a point on the involute that is generated when the generating line of the involute is rotated by about 180 degrees from the starting point of the involute.
[0008] According to one embodiment of the present invention, the predetermined point on the first involute lies between the starting point of the first involute and a point on the first involute that is generated when the generating line of the involute is rotated 360 degrees from the starting point of the first involute; and / or the predetermined point on the second involute lies between the starting point of the second involute and a point on the second involute that is generated when the generating line of the second involute is rotated 360 degrees from the starting point of the second involute.
[0009] According to embodiments of the present invention, the predetermined point on the first involute is a point of the first involute that is generated when the generating line of the first involute is rotated by about 180 degrees from the starting point of the first involute; and / or the predetermined point on the second involute is a point of the second involute that is generated when the generating line of the second involute is rotated by about 180 degrees from the starting point of the second involute.
[0010] According to one embodiment of the present invention, the maximum value of the distance between the at least one outer or inner surface of the spiral winding and the involute along the generating line of the involute is set to a predetermined value, wherein it is assumed that the at least one outer or inner surface of the spiral winding is designed as an involute, and that the maximum value of an error between the at least one outer or inner surface of the spiral winding used and the involute along the generating line of the involute is the predetermined value.
[0011] According to one embodiment of the present invention, the maximum value of the distance between the at least one outer or inner surface of the spiral winding and the involute along the generating line of the involute is smaller than the predetermined value.
[0012] According to one embodiment of the present invention, the defect is a defect caused by manufacturing defects on at least one of the outer or inner surfaces of the spiral winding in question, as well as by deformation of the spiral winding during use.
[0013] According to one embodiment of the present invention, the distance between at least one of the outer or inner surfaces of the spiral winding and the involute along the generating line of the involute is proportional to an angle by which the generating line of the involute is rotated from the predetermined point on the involute.
[0014] According to one embodiment of the present invention, the distance between the outer surface of the spiral turn and the first involute along the generating line of the first involute is proportional to an angle by which the generating line of the first involute is rotated from the predetermined point on the first involute; and / or the distance between the inner surface of the spiral turn and the second involute along the generating line of the second involute is proportional to an angle by which the generating line of the second involute is rotated from the predetermined point on the second involute.
[0015] According to embodiments of the present invention, the predetermined point on the first involute lies between the starting point of the first involute and a point on the first involute that is generated when the involute is rotated 360 degrees from the starting point of the first involute; the predetermined point on the second involute lies between the starting point of the second involute and a point on the second involute that is generated when the generating line of the second involute is rotated 360 degrees from the starting point of the second involute; and the predetermined point on the first involute and the predetermined point on the second involute differ by a spread angle of approximately 180 degrees.
[0016] According to one embodiment of the present invention, the predetermined point on the first involute is a point on the first involute that is generated by rotating the generating line of the first involute by about 180 degrees starting from the initial point of the first involute; the predetermined point on the second involute is the point on the second involute that is generated by rotating the generating line of the second involute by about 180 degrees starting from the initial point of the second involute; wherein the predetermined point on the first involute and the predetermined point on the second involute differ by a spread angle of about 180 degrees.
[0017] According to one embodiment of the present invention, a spiral compressor is further provided, comprising: a first spiral, wherein the first spiral has a first end plate and a first spiral turn projecting downwards from the first end plate; and a second spiral, wherein the second spiral has a second end plate and a second spiral turn projecting upwards from the second end plate, wherein the second spiral and the first spiral interact to form compression chambers for compressing a medium, wherein at least one of the first spiral and the second spiral is the aforementioned spiral, wherein the first spiral is a stationary spiral and the second spiral is an orbiting spiral.
[0018] According to one embodiment of the present invention, the spiral compressor further comprises: a housing; a support body mounted in the housing, wherein the first spiral is fixed in the housing and the second spiral is rotatably arranged on the support body; and a drive mechanism which is attached to a lower end of the housing and connected to the second spiral in order to set the second spiral in rotation.
[0019] According to one embodiment of the present invention, a spiral compressor is further provided, comprising: a first spiral having a first end plate and a first spiral turn projecting downwards from the first end plate; and a second spiral having a second end plate and a second spiral turn projecting upwards from the second end plate, wherein the second spiral and the first spiral interact to form compression chambers for compressing a medium, wherein at least one of the first spiral and the second spiral is the aforementioned spiral; the first spiral is a driving spiral and the second spiral is the driven spiral, wherein the first spiral is rotated by a drive mechanism and the second spiral is rotated by the first spiral.
[0020] According to one embodiment of the present invention, the spiral compressor further comprises: a support arranged below the second spiral, wherein a drive mechanism comprises: a motor; and a drive element comprising a hub section with an internal bore; and a flange section projecting radially outwards from one end of the hub section, wherein the drive element is rotatably supported by the support, the motor drives the first spiral to rotate by means of the drive element, the first spiral drives the second spiral to rotate, and the second end plate of the second spiral is rotatably supported on the flange section of the drive element.
[0021] According to one embodiment of the present invention, the drive element is connected to the first spiral via the flange section.
[0022] According to one embodiment of the present invention, the spiral compressor further comprises: a spiral cover having a spiral cover end plate with a central bore and a cylindrical section extending downwards from an outer circumference of the spiral cover end plate, wherein the cylindrical section of the spiral cover is connected to the flange section of the drive element and the spiral cover end plate is connected to the first end plate of the first spiral.
[0023] According to one embodiment of the present invention, the spiral compressor further comprises a stationary shaft, wherein a lower end of the stationary shaft is attached to the support and the hub section of the drive element is rotatably mounted on the stationary shaft.
[0024] The spiral for a spiral compressor and the spiral compressor according to the embodiments of the present invention, for example, improves the sealing effect between the spiral turns of the first spiral and the second spiral. Brief Description of Drawings Fig. Figure 1 is a schematic sectional view of a spiral compressor according to an embodiment of the present invention, taken along a direction parallel to an axial direction of the compressor; Fig. 2 is a schematic sectional view of the spiral compressor made of Fig. 1, which runs perpendicular to the axial direction of the compressor and shows a first spiral and a second spiral of the compressor; Fig. Figure 3 is a schematic top view of the second spiral of the in Fig. 1 spiral compressor shown; Fig. 4 is a schematic cross-sectional view of the second spiral of the in Fig. 1 spiral compressor shown; Fig. Figure 5 is a schematic sectional view of the spiral compressor according to another embodiment of the present invention, which runs along a direction parallel to the axial direction of the compressor; Fig. Figure 6 is a schematic sectional view of the spiral compressor made of Fig. 5, which runs perpendicular to the axial direction of the compressor and shows the first spiral and the second spiral of the compressor; Fig. Figure 7 is a schematic top view of the second spiral of the in Fig. 5 spiral compressors shown; and Fig. 8 is a schematic front view of the second spiral of the in Fig. 5 spiral compressors shown. Detailed description of preferred embodiments
[0025] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.
[0026] According to the Fig. 1, Fig. 2, Fig. 5 and Fig. 6 A spiral compressor 100 according to one embodiment of the present invention comprises a first spiral 10 and a second spiral 20. The first spiral 10 has a first end plate 19 and a first spiral turn 11 projecting downwards from the first end plate 19. The second spiral 20 has a second end plate 29 and a second spiral turn 21 projecting upwards from the second end plate 29. The second spiral 20 and the first spiral 10 together form compressor chambers for compressing a medium.
[0027] According to the Fig. 1 and Fig. In one embodiment of the present invention, the first spiral 10 is a fixed spiral and the second spiral 20 is an orbiting spiral. The spiral compressor can further comprise: a housing 30; a support body 40 arranged within the housing 30, wherein the first spiral 10 is fixed within the housing 30 and the second spiral 20 is rotatably mounted by the support body 40; and a drive mechanism 50 attached to a lower end of the housing 30 and connected to the second spiral 20 to drive the second spiral 20 to rotate. The drive mechanism 50 can comprise a motor 60, a drive shaft 61, and the like.
[0028] According to the Fig. 5 and Fig. In one embodiment of the present invention, the first spiral 10 is a driving spiral, and the second spiral 20 is a driven spiral. The first spiral 10 is set in rotation by the drive mechanism 50, and the second spiral 20 is set in rotation by the first spiral 10. The spiral compressor 100 may further comprise: a housing 30; and a support 41 arranged below the second spiral 20. The drive mechanism 50 comprises: a motor 60; and a drive element 70, wherein the drive element 70 comprises: a hub section 72 with an internal bore 71 and a flange section 73 projecting radially outward from one end of the hub section 72.The drive element 70 is rotatably supported by the bracket 41, the motor 60 driving the first spiral 10 via the drive element 70, and the first spiral 10 driving the second spiral 20, with the second end plate 29 of the second spiral 20 rotatably mounted on the flange section 73 of the drive element 70. The drive element 70 can be connected to the first end plate 19 of the first spiral 10 via the flange section 73.
[0029] According to the Fig. 5 and Fig. In one embodiment of the present invention, the spiral compressor 100 further comprises: a spiral cover 80, wherein the spiral cover 80 has: a spiral cover end plate 82 with a central bore 81; and a cylindrical section 83 extending downwards from an outer circumference of the spiral cover end plate 82, the cylindrical section 83 of the spiral cover 80 being connected to the flange section 73 of the drive element 70, and the spiral cover end plate 82 of the spiral cover 80 being connected to the first end plate 19 of the first spiral 10. The spiral compressor 100 may further comprise: a stationary shaft 90, wherein a lower end of the stationary shaft 90 is attached to the support 41, and wherein the hub section 72 of the drive element 70 is rotatably arranged on the stationary shaft 90.
[0030] According to the Fig. 5 and Fig. In one embodiment of the present invention, the scroll compressor 100 further comprises: an oil supply bolt 91, which is housed in an inner bore 92 of the stationary shaft 90, one end of which is arranged in an oil sump at the bottom of the housing 30 and the other end of which is connected to the hub section 25 of the second spiral 20. Alternatively, the scroll compressor 100 may have any other suitable pump to draw lubricating oil from the oil sump located at the bottom of the housing 30 into the inner bore 92 of the stationary shaft 90.
[0031] The spiral according to embodiments of the present invention is described below using the example of the second spiral 20, which is located in the Fig. 3, Fig. 4, Fig. 7 and Fig. 8 is shown.
[0032] According to the Fig. 3, Fig. 4, Fig. 7 and Fig. In one embodiment of the present invention, the spiral 20 comprises: an end plate 29; a spiral turn 21 which projects axially from the end plate 29, wherein the spiral turn 21 has an inner surface 221 and an outer surface 222 which are opposite each other in the thickness direction of the spiral turn 21.At least one of the outer surface 222 or the inner surface 221 of the spiral turn 21 uses an involute as a reference to generate the at least one of the outer surface 222 or the inner surface 221, wherein, from a predetermined point between a start point and an end point of the involute to the end point of the involute, a distance between the at least one of the outer surface 222 or the inner surface 221 of the spiral turn 21 and the involute gradually increases along a generating line of the involute, causing the at least one of the outer surface 222 or the inner surface 221 to be gradually displaced towards the center in the thickness direction of the spiral turn 21. According to the . Fig. 3, Fig. 4, Fig. 7 and Fig. In one example of the present invention, the distance between at least one of the outer surfaces 222 or the inner surface 221 of the spiral turn 21 and the involute along the generating line of the involute is proportional to an angle by which the generating line of the involute is rotated starting from the predetermined point on the involute. It is understood that this distance can be gradually increased by any other suitable means. The predetermined point on the involute can be a point on the involute that is obtained by rotating the generating line of the involute by approximately 180 degrees starting from the initial point of the involute.
[0033] According to the Fig. 3, Fig. 4, Fig. 7 and Fig. In embodiments of the present invention, the predetermined point on the involute lies between the starting point of the involute and a point on the involute that is generated when the generating line of the involute is rotated 360 degrees from the starting point of the involute. Furthermore, the predetermined point on the involute can also be a point on other involutes.
[0034] According to the Fig. 3, Fig. 4, Fig. 7 and Fig. In one embodiment of the present invention, the outer surface 222 of the spiral turn 21 uses a first involute as a reference for generating the outer surface 222. From a predetermined point between the start and end points of the first involute, the distance between the outer surface 222 of the spiral turn 21 and the first involute gradually increases along the generating line of the first involute, such that the outer surface 222 of the spiral turn 21 is gradually displaced towards the center in the thickness direction of the spiral turn 21. For example, the distance between the outer surface 222 of the spiral turn 21 and the first involute along the generating line of the first involute is proportional to the angle by which the generating line of the first involute is rotated from the predetermined point on the first involute.The predetermined point on the first involute can be a point on the first involute that results from rotating the generating line of the first involute by approximately 180 degrees from the starting point of the first involute.
[0035] According to the Fig. 3, Fig. 4, Fig. 7 and Fig. In embodiments of the present invention, the predetermined point on the first involute lies between the starting point of the first involute and a point on the first involute that arises when the generating line of the first involute is rotated 360 degrees from the starting point of the first involute. Furthermore, the predetermined point on the first involute can also be a point on other first involutes.
[0036] In embodiments of the present invention according to the Fig. 3, Fig. 4, Fig. 7 and Fig. 8 uses the inner surface 221 of the spiral turn 21 and the second involute as a reference for generating the inner surface 221, wherein the distance between the inner surface 221 of the spiral turn 21 and the second involute gradually increases along the generating line of the second involute from a predetermined point between the start point and the end point of the second involute to the end point of the second involute, such that the inner surface 221 of the spiral turn 21 is gradually offset towards the center in the thickness direction of the spiral turn 21. For example, the distance between the inner surface 221 of the spiral turn 21 and the second involute along the generating line of the second involute is proportional to the angle by which the generating line of the second involute is rotated from the predetermined point on the second involute.The predetermined point on the second involute can be a point on the second involute that results from rotating the generating line of the second involute by approximately 180 degrees relative to the starting point of the second involute.
[0037] In embodiments of the present invention according to the Fig. 3, Fig. 4, Fig. 7 and Fig. 8. The predetermined point on the second involute lies between the starting point of the second involute and a point on the second involute that results from rotating the generating line of the second involute 360 degrees from the starting point of the second involute. Furthermore, the predetermined point on the second involute can also be a point on another second involute.
[0038] In the embodiments of the present invention according to the Fig. 3, Fig. 4, Fig. 7 and Fig. 8. The predetermined point on the first involute is a point on the first involute that is generated when the generating line of the first involute is rotated approximately 180 degrees relative to the starting point of the first involute; the predetermined point on the second involute is a point on the second involute that is generated when the generating line of the second involute is rotated approximately 180 degrees from the starting point of the second involute; and the predetermined point on the first involute and the predetermined point on the second involute differ by a spread angle of approximately 180 degrees. Typically, the starting point of the first involute and the starting point of the second involute differ by a spread angle of approximately 180 degrees. The generating line of the first involute is rotated from the starting point of the first involute by a spread angle of approximately 180 degrees to reach the starting point of the second involute.The generating line of the first involute is rotated by a spread angle of approximately 180 degrees from the predetermined point on the first involute to reach the predetermined point on the second involute. Furthermore, the predetermined point on the first involute and the predetermined point on the second involute can also differ by a spread angle other than approximately 180 degrees.
[0039] In embodiments of the present invention according to the Fig. 3, Fig. 4, Fig. 7 and Fig. 8. The predetermined point on the first involute lies between the starting point of the first involute and a point on the first involute that is generated by rotating the generating line of the first involute 360 degrees from the starting point of the first involute; the predetermined point on the second involute lies between the starting point of the second involute and a point on the second involute that is generated by rotating the generating line of the second involute 360 degrees from the starting point of the second involute; and the predetermined point on the first involute and the predetermined point on the second involute differ by a spread angle of approximately 180 degrees. Furthermore, the predetermined point on the first involute and the predetermined point on the second involute may also differ by a spread angle other than approximately 180 degrees.
[0040] In embodiments of the present invention, according to the Fig. 3, Fig. 4, Fig. 7 and Fig. 8. The maximum value of the distance between at least one of the outer surfaces 222 or inner surfaces 221 of the spiral coil 21 and the involute along the generating line of the involute is set to a predetermined value. Assuming that at least one of the outer surfaces 222 or the inner surfaces 221 of the spiral coil 21 is formed as an involute, the maximum value of the error between at least one of the outer surfaces 222 or the inner surfaces 221 of the spiral coil 21 used and the involute along the generating line of the involute is the predetermined value. For example, the maximum value of the distance between at least one of the outer surfaces 222 or the inner surfaces 221 of the spiral coil 21 and the involute along the generating line of the involute is less than the predetermined value.The defect could be caused by either a manufacturing defect of at least one of the outer surfaces 222 or the inner surfaces 221 of the respective spiral coil 21, or by deformation of the spiral coil 21 during use. This deformation could be due to assembly, pressure, thermal deformation, centrifugal force, etc.
[0041] In embodiments of the present invention according to the Fig.2 to 4 and 6 to 8 are the outer surface 122 and the inner surface 121 of the first spiral turn 11 of the first spiral 10 offset in the thickness direction of the first spiral turn 11 relative to the first involute and to the second involute towards the center, and wherein the outer surface 222 and the inner surface 221 of the second spiral turn 21 of the second spiral 20 are offset in the thickness direction of the second spiral turn 21 relative to the first involute and to the second involute respectively towards the center; the outer surface 122 and the inner surface 121 of the first spiral turn 11 of the first spiral 10 are offset towards the center in the thickness direction of the first spiral turn 11 relative to the first involute or to the second involute, respectively, or the outer surface 222 and the inner surface 221 of the second spiral turn 21 of the second spiral 20 are offset towards the center in the thickness direction of the second spiral turn 21 relative to the first involute or to the second involute.are offset towards the center of the second involute; or the outer surface 122 of the first spiral turn 11 of the first spiral 10 is offset towards the center in the thickness direction of the first spiral turn 11 relative to the first involute, and / or the inner surface 221 of the second spiral turn 21 of the second spiral 20 is offset towards the center in the thickness direction of the second spiral turn 21 relative to the second involute, or the inner surface 121 of the first spiral turn 11 of the first spiral 10 is offset towards the center in the thickness direction of the first spiral turn 11 relative to the second involute, and / or the outer surface 222 of the second spiral turn 21 of the second spiral 20 is offset towards the center in the thickness direction of the second spiral turn 21 relative to the first involute.The application of the spiral winding 21 of the spiral 20 in the embodiments of the present invention to the first spiral winding 11 of the first spiral 10 and to the second spiral winding 21 of the second spiral 20 can be realized in other ways, without being limited to the embodiments of the present invention.
[0042] Although, by design, all gaps at a multitude of contact sealing sections located radially between the first turn 11 of the first spiral 10 and the second turn 21 of the second spiral 20 should be zero, manufacturing defects and deformation during use typically prevent all gaps at these multiple contact sealing sections from being zero. For example, the gaps at three contact sealing sections arranged sequentially and radially outside the axis of rotation of the second turn 21 of the second spiral 20 are designated RS1, RS2, and RS3, respectively. The least efficient scenario for the scroll compressor is RS1 > RS2 > RS3, while the most efficient scenario is RS1 < RS2 < RS3. This is because the pressure in the compression chamber near the center of the second turn 21 is greater than the pressure in the compression chamber near the circumference of the second turn 21.Under the same conditions, a greater leakage occurs in the compression chamber near the center of the second spiral turn 21 than in the compression chamber near the periphery of the second spiral turn 21. Due to centrifugal forces acting on the second spiral turn 21 of the second spiral 20, the second spiral turn 21 of the second spiral 20 deforms and thus touches the first spiral turn 11 of the first spiral 10, typically at a single point of contact.The spiral for a spiral compressor and the spiral compressor according to the embodiments of the present invention ensure that, in both the most unfavorable and the most favorable scenarios for the performance of the spiral compressor, the gaps at the contact sealing sections, which occur between the first spiral turn 11 of the first spiral 10 and the second spiral turn 21 of the second spiral 20 and which are located near the centers of the first spiral turn 11 and the second spiral turn 21, are zero or nearly zero, thereby improving the sealing.
[0043] With the spiral for a spiral compressor and the spiral compressor according to an embodiment of the invention, the sealing behavior between the first spiral 10 and the first spiral turn 11 and the second spiral 20 and the second spiral turn 21 can be improved, for example. That is, in the spiral for a spiral compressor and the spiral compressor according to an embodiment of the present invention, the sealing effect between the first spiral turn 11 of the first spiral 10 and the second spiral turn 21 of the second spiral 20 is improved by gradually reducing the thickness of the first spiral turn 11 and / or the second spiral turn 21 from a predetermined point between the start point and the end point of the involute to the end point of the involute.
Claims
[1] Spiral for a spiral compressor, comprising: - an end plate; - a spiral turn projecting axially from the end plate, wherein the spiral turn has inner and outer surfaces that are opposite each other in the thickness direction of the spiral turn, wherein for at least one of the outer or inner surfaces of the spiral turn an involute is used as a reference for generating at least the outer or inner surfaces, and wherein the distance between the at least one outer or inner surface of the spiral turn and the involute gradually increases from a predetermined point between the start point and the end point of the involute to the end point of the involute along a generating line of the involute, thereby gradually displacing at least one of the outer and inner surfaces of the spiral turn towards the center in the thickness direction of the spiral turn. [2] Spiral for the spiral compressor according to claim 1, wherein: the outer surface of the spiral turn uses a first involute as a reference for generating the outer surface, and wherein a distance from a predetermined point between the start point and the end point of the first involute to the end point of the first involute between the outer surface of the spiral turn and the first involute gradually increases along a generating line of the first involute, thereby gradually offsetting the outer surface of the spiral turn towards the center in the thickness direction of the spiral turn; and / or the inner surface of the spiral turn uses a second involute as a reference for generating the inner surface, and wherein a distance from a predetermined point between the start point and the end point of the second involute to the end point of the second involute between the inner surface of the spiral turn and the second involute gradually increases along a generating line of the second involute, thereby gradually offsetting the inner surface of the spiral turn towards the center in the thickness direction of the spiral turn. [3] Spiral for the spiral compressor according to claim 1, wherein: the predetermined point on the involute lies between the starting point of the involute and a point on the involute that is created when the generating line of the involute is rotated 360 degrees starting from the starting point of the involute. [4] Spiral for the spiral compressor according to claim 1, wherein: The predetermined point on the involute is a point on the involute that is created by rotating the generating line of the involute by approximately 180 degrees from the starting point of the involute. [5] Spiral for the spiral compressor according to claim 2, wherein: the predetermined point on the first involute lies between the starting point of the first involute and a point on the first involute that results from rotating the generating line of the first involute 360 degrees from the starting point of the first involute; and / or the predetermined point on the second involute lies between the starting point of the second involute and a point on the second involute that is created by rotating the generating line of the second involute by 360 degrees starting from the starting point of the second involute. [6] Spiral for the spiral compressor according to claim 2, wherein: the predetermined point on the first involute is a point on the first involute that arises when the generating line of the first involute is rotated by approximately 180 degrees from the starting point of the first involute; and / or The predetermined point on the second involute is a point on the second involute that is created by rotating the generating line of the second involute by approximately 180 degrees from the starting point of the second involute. [7] Spiral for the spiral compressor according to claim 1, wherein: the maximum value of the distance between at least one of the outer or inner surfaces of the spiral winding and the involute along the generating line of the involute is set according to a predetermined value, and assuming that at least one of the outer and inner surfaces of the spiral winding is formed as the involute, and where the maximum value of an error between at least one of the outer or inner surfaces of the spiral turn in question and the involute along the generating line of the involute is the predetermined value. [8] Spiral for the spiral compressor according to claim 7, wherein: the maximum value of the distance between at least one of the outer and inner surfaces of the spiral winding and the involute along the generating line of the involute is smaller than the specified value. [9] Spiral for the spiral compressor according to claim 7 or 8, wherein: The defect is a defect caused both by manufacturing defects in at least one of the outer and inner surfaces of the spiral coil in question and by deformation of the spiral coil during use. [10] Spiral for the spiral compressor according to claim 1, wherein: the distance between at least one of the outer surfaces and the inner surface of the spiral coil and the involute along the generating line of the involute is proportional to an angle by which the generating line of the involute is rotated starting from the predetermined point on the involute. [11] Spiral for the spiral compressor according to claim 2, wherein: the distance between the outer surface of the spiral turn and the first involute along the generating line of the first involute is proportional to an angle by which the generating line of the first involute rotates from the given point on the first involute; and / or the distance between the inner surface of the spiral turn and the second involute along the generating line of the second involute is proportional to an angle by which the generating line of the second involute is rotated from the predetermined point on the second involute. [12] Spiral for the spiral compressor according to claim 2, wherein: the predetermined point on the first involute lies between the starting point of the first involute and a point on the first involute that is created by rotating the generating line of the first involute by 360 degrees starting from the starting point of the first involute; the predetermined point on the second involute lies between the starting point of the second involute and a point on the second involute that arises when the generating line of the second involute is rotated 360 degrees starting from the starting point of the second involute; and where the predetermined point on the first involute and the predetermined point on the second involute differ by a spread angle of approximately 180 degrees. [13] Spiral for the spiral compressor according to claim 2, wherein: the predetermined point on the first involute is a point on the first involute that is created by rotating the generating line of the first involute by approximately 180 degrees from the starting point of the first involute; the predetermined point on the second involute is a point on the second involute that arises when the generating line of the second involute is rotated by approximately 180 degrees from the starting point of the second involute; and The predetermined point on the first involute and the predetermined point on the second involute differ by a spreading angle of approximately 180 degrees. [14] A spiral compressor comprising: - a first spiral having a first end plate and a first spiral turn projecting downwards from the first end plate; and - a second spiral comprising a second end plate and a second spiral turn projecting upwards from the second end plate, wherein the second spiral and the first spiral interact to form compression chambers for compressing a medium, wherein at least one of the first or the second spiral is a spiral defined in any one of claims 1 to 13; and the first spiral is a fixed spiral and the second spiral is an orbiting spiral. [15] Spiral compressor according to claim 14, further comprising: - a case; - a support body mounted inside the housing, wherein the first spiral is fixed inside the housing and the second spiral is rotatably supported on the support body; and - a drive mechanism that is attached to a lower end of the casing and connected to the second spiral to set the second spiral in rotation. [16] Spiral compressors, comprising - a first spiral having a first end plate and a first spiral turn projecting downwards from the first end plate; and - a second spiral having a second end plate and a second spiral turn extending upwards from the second end plate, the second spiral and the first spiral working together to form compression chambers for compressing a medium, - wherein at least one of the first spiral and the second spiral is a spiral as defined in any one of claims 1 to 13; and - the first spiral is a driving spiral and the second spiral is a driven spiral, wherein the first spiral is driven to rotate by a drive mechanism and the second spiral is driven to rotate by the first spiral. [17] Spiral compressor according to claim 16, further comprising: - a bracket located below the second spiral, - a drive mechanism comprising a motor and a drive element, wherein the drive element has a hub section with an internal bore and a flange section projecting radially outwards from one end of the hub section, and the drive element is rotatably supported by the bracket, and wherein the motor drives the first spiral to rotate via the drive element and the first spiral drives the second spiral to rotate, the second end plate of the second spiral being rotatably supported on the flange section of the drive element. [18] Spiral compressor according to claim 17, wherein: the drive element is connected to the first end plate of the first spiral winding via the flange section. [19] Spiral compressor according to claim 18, further comprising: a spiral cover, wherein the spiral cover has a spiral cover end plate with a central bore and a cylindrical section extending downwards from an outer circumference of the spiral cover end plate, the cylindrical section of the spiral cover being connected to the flange section of the drive element, and the spiral cover end plate of the spiral cover being connected to the first end plate of the first spiral. [20] Spiral compressor according to claim 18, further comprising: a stationary shaft, wherein a lower end of the stationary shaft is attached to the support and the hub section of the drive element is rotatably arranged on the stationary shaft.