A static scroll and scroll compressor

Abstract

The application provides a static scroll and a scroll compressor, wherein the static scroll has a first surface, the first surface is provided with a pressure relief hole group, the pressure relief hole group comprises a pressure relief hole and a connecting hole, the connecting hole is used for connecting one end of a pressure relief valve piece through a fastener, and the other end of the pressure relief valve piece is used for opening and closing the pressure relief hole; the first surface has a first area between the pressure relief hole and the connecting hole, the first area is opposite to the pressure relief valve piece when the pressure relief valve piece is closed; and the pressure relief hole group further comprises a first counterbore arranged on the first area. According to the technical scheme of the application, the first counterbore is arranged on the first area, so that the first counterbore is opposite to the pressure relief valve piece when the pressure relief valve piece is closed, and thus the opening characteristic of the pressure relief valve piece can be improved, the pressure relief valve piece is easier to open, and thus the problem that the pressure relief valve piece is not timely opened can be reduced, and the energy efficiency of the compressor is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of compressors, and particularly relates to a static scroll and a scroll compressor. BACKGROUND

[0002] At present, scroll compressors are developing towards the trend of high efficiency. In this process, due to the design characteristics of the structure, there is a problem of not opening the pressure relief valve in time under some operating conditions, which has become a bottleneck restricting the improvement of energy efficiency. SUMMARY

[0003] Therefore, the present application provides a static scroll and a scroll compressor, which can solve the technical problem of low compressor energy efficiency caused by not opening the pressure relief valve in time in the prior art.

[0004] In order to solve the above problems, the present application provides a static scroll, which has a first surface, the first surface is provided with a pressure relief hole group, the pressure relief hole group includes a pressure relief hole and a connecting hole, the connecting hole is used to connect one end of a pressure relief valve plate through a fastener, so that the other end of the pressure relief valve plate opens and closes the pressure relief hole.

[0005] The first surface has a first area between the pressure relief hole and the connecting hole, and the first area is opposite to the pressure relief valve plate when the pressure relief valve plate is closed.

[0006] Among them, the pressure relief hole group further includes a first counterbore arranged on the first area.

[0007] In some embodiments, the pressure relief hole group further includes a second counterbore, the number of pressure relief holes is two or more, and each is arranged in the second counterbore, and the other end of the pressure relief valve plate opens and closes each pressure relief hole by opening and closing the second counterbore.

[0008] In some embodiments, the distance between the center lines of the connecting hole and the second counterbore is L1, and the distance between the center lines of the first counterbore and the second counterbore is L2, wherein L2=a*L1, a=1 / 3~2 / 3.

[0009] In some embodiments, the number of pressure relief hole groups is two or more, and is distributed at different positions on the first surface, the number of first areas is equal to and one-to-one corresponds to the number of pressure relief hole groups.

[0010] In some embodiments, the pressure relief valve plate has an opening hole, and the opening hole is opposite to the first area when the pressure relief valve plate is closed.

[0011] In some embodiments, the opening hole is a round hole or a square hole.

[0012] Alternatively, the opening hole comprises a set of counterbores, the set of counterbores comprises a first strip-shaped counterbore and a second strip-shaped counterbore arranged in a splay shape, the first strip-shaped counterbore and the second strip-shaped counterbore are both arranged symmetrically about a center plane in the length direction of the pressure relief valve plate, and the small end of the splay shape faces the other end of the pressure relief valve plate, one end of the first strip-shaped counterbore away from the second strip-shaped counterbore penetrates one side in the width direction of the pressure relief valve plate, and one end of the second strip-shaped counterbore away from the first strip-shaped counterbore penetrates the other side in the width direction of the pressure relief valve plate.

[0013] In some embodiments, when the pressure relief valve plate is closed, the distance between the center lines of the opening hole and the first counterbore is L3, and the length of the pressure relief valve plate is L, wherein L3 = b*L, b = 1 / 5-1 / 4.

[0014] The application also provides a scroll compressor comprising the stationary scroll described in any one of the above.

[0015] The stationary scroll and the scroll compressor provided by the application have the following beneficial effects:

[0016] 1. Since the first counterbore is arranged in the first area, the first counterbore is opposite to the pressure relief valve plate when the pressure relief valve plate is closed, so that the opening characteristics of the pressure relief valve plate can be improved, the pressure relief valve plate is easier to open, and thus the problem of untimely opening of the pressure relief valve plate can be reduced, and the energy efficiency of the compressor is improved.

[0017] 2. By arranging the opening hole on the pressure relief valve plate, the opening characteristics of the pressure relief valve plate can be further improved, the pressure relief valve plate is easier to open, and thus the problem of untimely opening of the pressure relief valve plate can be reduced, and the energy efficiency of the compressor is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. The drawings in the following description are only exemplary, and for those skilled in the art, other drawings can also be derived from the provided drawings without creative labor.

[0019] Figure 1 is a structural schematic diagram of a stationary scroll provided by an embodiment of the application;

[0020] Figure 2 is Figure 1 is a stationary scroll in

[0021] Figure 3 is a structural schematic diagram of a pressure relief valve plate provided by an embodiment of the application;

[0022] Figure 4 is another embodiment of the present application provides a structure diagram of a pressure relief valve piece;

[0023] Figure 5 is another embodiment of the present application provides a structure diagram of a pressure relief valve piece;

[0024] Figure 6 is an embodiment of the present application provides a structure diagram of a scroll compressor;

[0025] Figure 7 A comparative diagram of compressor power consumption of a compressor of an embodiment of the present application under different working conditions is shown;

[0026] Figure 8 A comparative diagram of compressor power consumption of a compressor of another embodiment of the present application under different working conditions is shown.

[0027] The reference signs are:

[0028] 1, orbiting scroll; 2, shell; 3, fixed scroll; 4, upper bracket; 5, main bearing; 6, motor; 7, crankshaft; 8, auxiliary bearing; 9, lower cover; 10, cross slip ring; 11, upper cover; 12, pressure relief valve piece; 12a, opening; 13, pressure relief valve seat; 14, fastener; 31, first surface; 300, pressure relief hole group; 301, connecting hole; 302, pressure relief hole; 303, second counterbore; 311, first area; 3a01, first counterbore; 12a1, via hole; 120, counterbore group; 12a2, first strip-shaped counterbore; 12a3, second strip-shaped counterbore; 121, one end of the pressure relief valve piece; 122, the other end of the pressure relief valve piece. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all. The following description of at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0030] In the description of the application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or positional relationship are generally based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the application and simplifying the description, without the opposite description, these orientation words do not indicate and imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the scope of protection of the application; The orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0031] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial positional relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0032] In addition, it should be noted that the use of the words "first", "second" and the like to define parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, therefore it cannot be understood as a limitation on the scope of protection of the application.

[0033] For reference Figures 1-2 As shown, according to the embodiment of the application, a static scroll 3 is provided, the static scroll 3 has a first surface 31, and a pressure relief hole group 300 is arranged on the first surface 31. The pressure relief hole group 300 includes a pressure relief hole 302 and a connecting hole 301. The connecting hole 301 is used to connect one end 121 of the pressure relief valve sheet with the fastener 14, so that the other end 122 of the pressure relief valve sheet opens and closes the pressure relief hole 302. Wherein, the pressure relief valve sheet 12 is provided with a via hole 12a1 for the fastener 14 to pass through. In some embodiments, the connecting hole 301 can be a threaded hole, and the fastener 14 is a screw matched with the threaded hole. The screw is used to be screwed in the threaded hole through the via hole 12a1 on the pressure relief valve sheet 12, so as to fix one end 121 of the pressure relief valve sheet on the static scroll 3.

[0034] The aforementioned first surface 31 has a first region 311 located between the pressure relief hole 302 and the connecting hole 301, which is opposite to the pressure relief valve plate 12 when the pressure relief valve plate 12 is closed. The pressure relief hole group 300 also includes a first countersunk hole 3a01 provided on the first region 311.

[0035] In the above example, since the first countersunk hole 3a01 is set in the first region 311, the first countersunk hole 3a01 is opposite to the pressure relief valve plate 12 when the pressure relief valve plate 12 is closed. This can improve the opening characteristics of the pressure relief valve plate 12, making the pressure relief valve plate 12 easier to open, thereby reducing the problem of the pressure relief valve plate 12 not opening in time and improving the energy efficiency of the compressor.

[0036] In some implementations, such as Figures 1-2 As shown, the first surface 31 is the end face of the stationary vortex disk 3, and the first surface 31 is a plane.

[0037] In some implementations, such as Figure 2 As shown, the aforementioned stationary scroll 3 is also provided with a pressure relief valve seat 13, which is located on the side of the pressure relief valve plate 12 opposite to the stationary scroll 3. Both the pressure relief valve seat 13 and the pressure relief valve plate 12 are fixed to the stationary scroll 3 by the same fastener 14. Specifically, when the fastener 14 is a screw, the screw passes through the pressure relief valve seat 13 and the pressure relief valve plate 12 in sequence and is screwed into the threaded hole, thereby fixing one end of both the pressure relief valve seat 13 and the pressure relief valve plate 12 to the stationary scroll 3.

[0038] In some implementations, such as Figure 1 As shown, the aforementioned pressure relief hole group 300 also includes a second countersunk hole 303, and the number of the aforementioned pressure relief holes 302 is two or more, all of which are located within the second countersunk hole 303. The other end 122 of the pressure relief valve plate opens and closes each pressure relief hole 302 by opening and closing the second countersunk hole 303.

[0039] In the above example, the second countersunk hole 303 buffers the airflow from each pressure relief hole 302, thereby reducing the impact force of the airflow on the pressure relief valve plate 12 and improving its service life. Furthermore, the present invention uses two or more small-diameter pressure relief holes 302 instead of the existing single large-diameter pressure relief hole for pressure relief, which reduces gas leakage when the pressure relief valve plate 12 is closed.

[0040] In some implementations, such as Figure 1 As shown, the distance between the center lines of the aforementioned connecting hole 301 and the second countersunk hole 303 is L1. The distance between the center lines of the first countersunk hole 3a01 and the second countersunk hole 303 is L2. Wherein, L2 = a * L1, a = 1 / 3 to 2 / 3.

[0041] In the above example, by setting L2 = a*L1, the opening characteristics of the pressure relief valve piece 12 can be further improved, the power consumption of the compressor can be reduced, and the energy efficiency of the compressor can be improved.

[0042] Figure 7 A comparative diagram of the power consumption of the compressor under different working conditions is shown. The scheme of the embodiment of the application is that the distance between the center lines of the connecting hole 301 and the second counterbore 303 is L1, the distance between the center lines of the first counterbore 3a01 and the second counterbore 303 is L2, and L2 = a*L1, a = 1 / 3-2 / 3. The comparative scheme is that no first counterbore 3a01 is arranged on the first surface 31, or the first surface 31 is provided with the aforementioned first counterbore 3a01, but L2 is not equal to a*L1. From the comparative diagram, it can be seen that, compared with the comparative scheme, the scheme of the application can effectively reduce the power consumption of the compressor under working conditions 1-7. The working conditions 1-7 are seven commonly used working conditions of the compressor. From the comparative diagram, it can be seen that, compared with the comparative scheme, the power consumption of the compressor under the working condition 1 is reduced by 0.56%, the power consumption of the compressor under the working condition 2 is reduced by 0.29%, the power consumption of the compressor under the working condition 3 is reduced by 0.07%, the power consumption of the compressor under the working condition 4 is reduced by 0.77%, the power consumption of the compressor under the working condition 5 is reduced by 2.47%, the power consumption of the compressor under the working condition 6 is reduced by 1.51%, and the power consumption of the compressor under the working condition 7 is reduced by 0.41%. Therefore, the power consumption of the compressor under the scheme of the application is significantly reduced, and the reduction range is between 0.07% and 2.47%. Figure 7 Figure 7

[0043] In some embodiments, as shown in FIG. 6, the number of the aforementioned pressure relief hole groups 300 can be two or more, and the pressure relief hole groups 300 are distributed at different positions on the first surface 31. The number of the aforementioned first regions 311 is equal to the number of the pressure relief hole groups 300, and each first region 311 corresponds to one pressure relief hole group 300. Figures 1-2

[0044] In the above example, compared with a single pressure relief hole group 300, the application can make the pressure relief more smooth by arranging the pressure relief hole groups 300 at different positions.

[0045] In some embodiments, as shown in FIG. 6, the number of the aforementioned pressure relief hole groups 300 can be two or more, and the pressure relief hole groups 300 are distributed at different positions on the first surface 31. The number of the aforementioned first regions 311 is equal to the number of the pressure relief hole groups 300, and each first region 311 corresponds to one pressure relief hole group 300. Figures 3-5

[0046] ​​​​In the above examples, by setting the opening hole 12a on the pressure relief valve plate 12, the opening characteristics of the pressure relief valve plate 12 can be further improved, the pressure relief valve plate 12 is more easily opened, and thus the problem of the pressure relief valve plate 12 not being opened in time can be reduced, and the energy efficiency of the compressor can be improved.

[0047] In the first example, the aforementioned opening hole 12a can be a round hole (as shown in Figure 4 or a square hole (as shown in Figure 3 and the like.

[0048] In the second example, as shown in Figure 5 the aforementioned opening hole 12a can include a set of counterbores 120, which can include a first strip-shaped counterbore 12a2 and a second strip-shaped counterbore 12a3 arranged in a mule's foot shape, both of which are symmetrically arranged about the center of the length direction of the pressure relief valve plate 12, and the small end of the mule's foot shape faces the other end 122 of the pressure relief valve plate. One end of the first strip-shaped counterbore 12a2 away from the second strip-shaped counterbore 12a3 penetrates one side in the width direction of the pressure relief valve plate 12, and one end of the second strip-shaped counterbore 12a3 away from the first strip-shaped counterbore 12a2 penetrates the other side in the width direction of the pressure relief valve plate 12.

[0049] In the above examples, the set of counterbores 120 designed in a mule's foot shape has the effect of facilitating processing, and is beneficial to further improve the opening characteristics of the pressure relief valve plate 12, making the pressure relief valve plate 12 more easily opened, thereby reducing the problem of the pressure relief valve plate 12 not being opened in time, and improving the energy efficiency of the compressor.

[0050] In some embodiments, as shown in Figure 5 the number of the aforementioned set of counterbores 120 can be two or more, and arranged in sequence and spaced along the length direction of the pressure relief valve plate 12, which is beneficial to further improve the opening characteristics of the pressure relief valve plate 12, making the pressure relief valve plate 12 more easily opened, thereby reducing the problem of the pressure relief valve plate 12 not being opened in time, and improving the energy efficiency of the compressor.

[0051] In some embodiments, as shown in Figure 3 when the pressure relief valve plate 12 is closed, the distance between the center lines of the aforementioned opening hole 12a and the first counterbore 3a01 is L3, and the length of the pressure relief valve plate 12 is L. Wherein, L3 = b*L, b = 1 / 5~1 / 4.

[0052] In the above examples, by setting L3 = b*L, the opening characteristics of the pressure relief valve plate 12 can be further improved, the power consumption of the compressor can be reduced, and the energy efficiency of the compressor can be improved.

[0053] Figure 8A comparative diagram of compressor power consumption under different operating conditions is shown for another embodiment of the present invention. In this other embodiment, when the pressure relief valve 12 is closed, the distance between the center lines of the aforementioned opening 12a and the first countersunk hole 3a01 is L3, and the length of the pressure relief valve 12 is L. Where L3 = b * L, b = 1 / 5 to 1 / 4. The comparative solution is: the pressure relief valve 12 has no opening 12a, and the first surface 31 does not have the first countersunk hole 3a01. Figure 8 It can be seen that, compared to the comparative solution, the present invention can effectively reduce the compressor's power consumption in all seven operating conditions (conditions 1-7). Conditions 1-7 are seven commonly used operating conditions for compressors. Figure 8 As can be seen from the comparison lines, under operating condition 1, the compressor power consumption of the present invention is reduced by 0.47% compared to the comparative solution; under operating condition 2, the compressor power consumption of the present invention is reduced by 0.13% compared to the comparative solution; under operating condition 3, the compressor power consumption of the present invention is reduced by 0.04% compared to the comparative solution; under operating condition 4, the compressor power consumption of the present invention is reduced by 0.19% compared to the comparative solution; under operating condition 5, the compressor power consumption of the present invention is reduced by 0.54% compared to the comparative solution; under operating condition 6, the compressor power consumption of the present invention is reduced by 0.27% compared to the comparative solution; and under operating condition 7, the compressor power consumption of the present invention is reduced by 0.46% compared to the comparative solution. In summary, the compressor power consumption of the present invention is significantly reduced compared to the comparative solution, with a reduction range between 0.04% and 0.54%.

[0054] It should be noted that when the opening 12a includes the countersunk hole group 120, and the number of countersunk hole groups 120 is two or more, the countersunk hole groups 120 cooperate to form a countersunk hole structure. At this time, the center line of the opening 12a is the center line of the countersunk hole structure.

[0055] like Figure 6 As shown, the present invention also provides a scroll compressor, which may include the stationary scroll 3 of any of the above-mentioned components. Because the scroll compressor uses the aforementioned stationary scroll 3, and because the first countersunk hole 3a01 is located in the first region 311, the first countersunk hole 3a01 is opposite to the pressure relief valve 12 when the pressure relief valve 12 is closed. This improves the opening characteristics of the pressure relief valve 12, making it easier to open, thereby reducing the problem of untimely opening of the pressure relief valve 12 and improving the energy efficiency of the compressor.

[0056] like Figure 6As shown, the scroll compressor mainly consists of a moving scroll 1, a housing 2, a stationary scroll 3, an upper bracket 4, a main bearing 5, a motor 6, a crankshaft 7, a secondary bearing 8, a lower cover 9, a cross slip ring 10, and an upper cover 11. The motor 6 is fixed to the housing 2 by cold pressing or heat fitting, and the upper bracket 4 is connected to the housing 2 by welding. The stationary scroll 3 and the moving scroll 1 are mounted opposite each other on the upper bracket 4 with a phase angle difference of 180 degrees. Under the driving action of the crankshaft 7, the moving scroll 1 meshes with the stationary scroll 3 to form a series of mutually isolated crescent-shaped sealed cavities with gradually changing volumes.

[0057] When the scroll compressor is running, the motor 6 drives the crankshaft 7 to rotate. The top of the crankshaft 7 has an eccentric crank section at the contact point with the moving scroll 1. The eccentric crank section drives the moving scroll 1 to perform eccentric rotation with a fixed radius. Under the anti-rotation action of the cross slip ring 10, the actual running path of the moving scroll 1 is a rotary translational motion. The refrigerant entering from outside the scroll compressor is drawn into the crescent-shaped suction chamber formed by the stationary scroll 3 and the moving scroll 1. Then, it is discharged from the exhaust port of the stationary scroll 3 into the sealed cavity formed by the upper cover 11, the housing 2, and the lower cover 9. Finally, it is discharged from the scroll compressor through the exhaust copper pipe on the housing 2.

[0058] like Figures 1-2 As shown, to address some overcompression conditions, a connection hole 301, a pressure relief hole 302, and a second countersunk hole 303 are typically provided on the stationary scroll plate 3. Simultaneously, one end of both the pressure relief valve plate 12 and the pressure relief valve seat 13 are fixed to the stationary scroll plate 3 using screws. Under some overcompression conditions, the other end 122 of the pressure relief valve plate will be lifted by the airflow through the pressure relief hole 302 until it abuts against the pressure relief valve seat 13. The pressure relief valve seat 13 limits the rebound height of the other end of the pressure relief valve plate 12. After the other end of the pressure relief valve plate 12 rebounds, it opens the pressure relief hole 302, thus allowing for early exhaust and improving energy efficiency.

[0059] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0060] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A static vortex disk (3), characterized in that: The static vortex disk (3) has a first surface (31), on which a pressure relief hole group (300) is provided. The pressure relief hole group (300) includes a pressure relief hole (302) and a connecting hole (301). The connecting hole (301) is used to connect to one end (121) of the pressure relief valve plate by means of a fastener (14), so that the other end (122) of the pressure relief valve plate opens and closes the pressure relief hole (302). The first surface (31) has a first region (311) located between the pressure relief hole (302) and the connection hole (301), the first region (311) being opposite to the pressure relief valve plate (12) when the pressure relief valve plate (12) is closed; The pressure relief hole group (300) further includes a first countersunk hole (3a01) disposed on the first region (311); The pressure relief valve plate (12) has an opening (12a) that is opposite to the first region (311) when the pressure relief valve plate (12) is closed.

2. The stationary vortex disk (3) according to claim 1, characterized in that: The pressure relief hole group (300) further includes a second countersunk hole (303). There are two or more pressure relief holes (302), and they are all located in the second countersunk hole (303). The other end (122) of the pressure relief valve plate opens and closes each pressure relief hole (302) by opening and closing the second countersunk hole (303).

3. The static vortex disk (3) according to claim 2, characterized in that: The distance between the center lines of the connecting hole (301) and the second countersunk hole (303) is L1, and the distance between the center lines of the first countersunk hole (3a01) and the second countersunk hole (303) is L2, where L2 = a * L1, and a = 1 / 3 to 2 / 3.

4. The stationary vortex disk (3) according to any one of claims 1-3, characterized in that: The number of pressure relief hole groups (300) is two or more, and they are distributed at different positions on the first surface (31). The number of the first region (311) is equal to the number of pressure relief hole groups (300) and they correspond one-to-one.

5. The stationary vortex disk (3) according to claim 1, characterized in that: The opening (12a) is a round hole or a square hole; Alternatively, the opening (12a) may include a countersunk hole group (120), which includes a first strip countersunk hole (12a2) and a second strip countersunk hole (12a3) arranged in a figure-eight shape. The first strip countersunk hole (12a2) and the second strip countersunk hole (12a3) are symmetrically arranged about the center face of the pressure relief valve plate (12) in the length direction, and the small end of the figure-eight shape faces the other end (122) of the pressure relief valve plate. The end of the first strip countersunk hole (12a2) away from the second strip countersunk hole (12a3) passes through one side of the pressure relief valve plate (12) in the width direction, and the end of the second strip countersunk hole (12a3) away from the first strip countersunk hole (12a2) passes through the other side of the pressure relief valve plate (12) in the width direction.

6. The stationary vortex disk (3) according to claim 1, characterized in that: When the pressure relief valve plate (12) is closed, the distance between the center lines of the opening (12a) and the first countersunk hole (3a01) is L3, and the length of the pressure relief valve plate (12) is L, where L3 = b * L, b = 1 / 5 ~ 1 / 4.

7. A scroll compressor, characterized in that: Includes the static vortex disk (3) according to any one of claims 1-6.

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