Stator assembly, motor and compressor

Abstract

The utility model relates to a kind of stator assembly, motor and compressor, stator assembly includes stator core, insulation framework, stator core includes annular stator yoke and the stator tooth of several interval distribution on the inner circumferential wall of stator yoke, the winding slot of through in axial direction is formed between two adjacent stator teeth, the inside wall recess of winding slot forms step groove, step groove in axial direction penetrates one end of winding slot;Insulation framework includes annular framework main body, one end of framework main body is abutted on the end face of stator core, and framework main body is equal in number with the number of winding slot and is spaced apart and is distributed in circumferential direction, the edge of each gap extends step edge, step edge is inserted in step groove in the direction of away from framework main body in axial direction.The utility model can reduce the height of invalid coil, reduce the assembly difficulty of insulation framework and stator core, improve the performance of motor.

Description

Technical Field

[0001] This utility model relates to the field of compressor technology, and in particular to a stator assembly, a motor and a compressor. Background Technology

[0002] Rotary compressors typically consist of end covers, a housing, a motor fixed inside the housing that provides rotational power, and a pump body that compresses the refrigerant. The motor's stator assembly generally includes a stator core, an insulating frame, and copper wire windings. The stator core includes an annular stator yoke, with several spaced-apart stator teeth extending radially from its inner circumferential wall. Adjacent stator teeth form slots for the copper wire windings. Correspondingly, the insulating frame includes an annular frame body fitted onto the ends of the stator core, with several frame sleeves extending from its inner wall, each sleeve corresponding to one stator tooth. To ensure sufficient insulation distance, the frame sleeves typically extend a considerable depth into the slots, increasing assembly difficulty. Furthermore, the frame sleeves are usually thick, increasing the height of ineffective coils and reducing material utilization, ultimately leading to a decrease in motor performance. Utility Model Content

[0003] Based on this, the purpose of this utility model is to overcome the shortcomings of the prior art and provide a stator assembly, motor and compressor that can reduce the height of ineffective coils, reduce the assembly difficulty of the insulating frame and stator core, and improve the performance of the motor.

[0004] To achieve the above objectives, the first aspect of this utility model provides a stator assembly, including a stator core and an insulating frame. The stator core includes an annular stator yoke and a plurality of stator teeth spaced apart on the inner circumferential wall of the stator yoke. An axially penetrating winding groove is formed between two adjacent stator teeth. A stepped groove is formed by a recess in the inner sidewall of the winding groove, and the stepped groove penetrates one end of the winding groove in the axial direction. The insulating frame includes an annular frame body. One end of the frame body abuts against the end face of the stator core, and the frame body has notches spaced apart in the circumferential direction, the number of which is equal to the number of winding grooves. At the edge of each notch, a stepped edging extends in the axial direction away from the frame body, and the stepped edging is inserted into the stepped groove.

[0005] In one embodiment, the stepped edging is divided into a first edging and a second edging along the axial direction. The first edging is connected to the main body of the skeleton. The inner sidewall of the first edging and the inner sidewall of the second edging are located on the same side. The thickness of the second edging is less than the thickness of the first edging.

[0006] In one embodiment, the second edging is recessed inward from the outer wall of the stepped edging, so that the second edging and the first edging form a stepped shape, and a chamfer is provided at the connection between the second edging and the first edging.

[0007] In one embodiment, the thickness of the main skeleton body along the axial direction is H0, the depth of the first edge along the axial direction is H1, and the depth of the second edge along the axial direction is H2, satisfying the following relationships: 1.0mm≤H0≤1.8mm; 2.0mm≤H0+H1+H2.

[0008] In one embodiment, the depth of the stepped groove along the axial direction is Ha, which satisfies the relationship: 0.2mm≤Ha-(H1+H2)≤0.7mm.

[0009] In one embodiment, the width of the stepped groove is Ta, and the thickness of the first edging is T1, satisfying the following relationships: 0≤Ta-T1≤0.5mm; 0.5H1≤T1≤H1.

[0010] In one implementation, the thickness of the second edge is T2, which satisfies the relationship: 0.2H2≤T2≤0.5H2.

[0011] In one embodiment, a stator pin is provided on the end face of the insulating frame, and a stator slot is provided on the end face of the stator yoke, with the stator pin being inserted into the stator slot.

[0012] Therefore, according to the stator assembly of this utility model, based on the fact that the thickness of the main body of the insulating frame meets the insulation distance, a stepped edge is formed on the end face of the main body of the frame for insertion and assembly with several winding slots. The stepped edge is designed as a first edge and a second edge distributed axially, with the thickness of the second edge being less than that of the first edge. Thus, when the stepped edge is inserted into the stepped groove of the winding slot, because the size of the second edge is smaller than the size of the stepped groove, the stepped edge can be inserted into the stepped groove without precise alignment, allowing the first edge to be quickly inserted as well. This greatly reduces the assembly difficulty between the insulating frame and the stator core. In other words, the stator assembly of this utility model, based on the fact that the main body of the frame meets the insulation distance, uses a stepped groove formed by a recess in the inner wall of the winding slot of the stator core, allowing the inner wall of the stepped edge to be on the same side as the inner wall of the winding slot. This effectively reduces the steps of ineffective coils. Furthermore, the stepped edge, through its stepped segmented design, reduces the assembly difficulty between the insulating frame and the stator core.

[0013] A second aspect of this invention provides an electric motor comprising the stator assembly described in any of the preceding claims. The electric motor according to this invention reduces the height of ineffective coils, lowers the assembly difficulty between the insulating frame and the stator core, and improves the motor's performance.

[0014] A third aspect of this invention provides a compressor comprising the motor described in any of the preceding claims. The compressor according to this invention reduces the height of ineffective coils, lowers the assembly difficulty of the insulating frame and stator core, and improves motor performance.

[0015] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0016] Figure 1 This is one of the structural schematic diagrams of the stator assembly according to an embodiment of the present utility model;

[0017] Figure 2 This is a second schematic diagram of the stator assembly according to an embodiment of the present utility model;

[0018] Figure 3 for Figure 2 A schematic cross-sectional view along the BB direction is shown.

[0019] Figure 4 for Figure 3 An enlarged schematic diagram of part A shown;

[0020] Figure 5 This is an exploded view of the stator assembly according to an embodiment of the present utility model;

[0021] Figure 6 This is a schematic diagram of the insulating frame of the stator assembly according to an embodiment of the present invention.

[0022] Explanation of reference numerals in the attached figures:

[0023] 10. Stator core; 11. Stator yoke; 12. Stator teeth; 13. Winding slot; 14. Stepped slot; 15. Stator slot; 20. Insulating frame; 21. Frame body; 22. Notch; 23. Stepped edging; 24. First edging; 25. Second edging; 26. Stator pin. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular forms “a,” “the,” and “the” used in this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0026] In the following description, when referring to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims. In the description of this application, it should be understood that the terms "first," "second," "third," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0027] In related technologies, rotary compressors typically consist of end covers, a housing, a motor fixed inside the housing that provides rotational power, and a pump body that compresses the refrigerant. The motor stator assembly generally includes a stator core, an insulating frame, and copper wire windings. The stator core includes an annular stator yoke, with several spaced-apart stator teeth extending radially from its inner circumferential wall. Adjacent stator teeth form through slots for the copper wire windings. Correspondingly, the insulating frame includes an annular frame body fitted onto the end of the stator core, with several frame sleeves extending from its inner wall, one sleeve corresponding to one stator tooth. To ensure sufficient insulation distance, the frame sleeves typically extend a considerable depth into the through slots, increasing assembly difficulty. Furthermore, the frame sleeves are usually thick, increasing the height of ineffective coils and reducing material utilization, ultimately leading to a decrease in motor performance.

[0028] Therefore, this utility model embodiment provides a stator assembly, a motor, and a compressor. The stator assembly, motor, and compressor according to this utility model embodiment can reduce the height of ineffective coils, lower the assembly difficulty of the insulating frame 20 and the stator core 10, and improve the performance of the motor.

[0029] Please see Figures 1 to 6The first aspect of this utility model provides a stator assembly, including a stator core 10 and an insulating frame 20. The stator core 10 includes an annular stator yoke 11 and a plurality of stator teeth 12 spaced apart on the inner circumferential wall of the stator yoke 11. A winding groove 13 is formed between two adjacent stator teeth 12, and a stepped groove 14 is formed in the inner sidewall of the winding groove 13. The stepped groove 14 penetrates one end of the winding groove 13 in the axial direction. The insulating frame 20 includes an annular frame body 21. One end of the frame body 21 abuts against the end face of the stator core 10, and the frame body 21 has notches 22 spaced apart in the circumferential direction, the number of which is equal to the number of winding grooves 13. At the edge of each notch 22, a stepped edge 23 extends in the axial direction away from the frame body 21, and the stepped edge 23 is inserted into the stepped groove 14.

[0030] The stepped edging 23 is divided into a first edging 24 and a second edging 25 along the axial direction. The first edging 24 is connected to the main frame 21. The inner sidewall of the first edging 24 and the inner sidewall of the second edging 25 are located on the same side. The thickness of the second edging 25 is less than the thickness of the first edging 24. Furthermore, the second edging 25 is recessed inward from the outer sidewall of the stepped edging 23, so that the second edging 25 and the first edging 24 form a stepped shape, and a chamfer is provided at the connection between the second edging 25 and the first edging 24.

[0031] Specifically, in this embodiment of the invention, the inner sidewalls of the first edge 24 and the second edge 25 are located on the same side as the inner sidewall of the winding groove 13. That is, in this embodiment of the invention, a stepped groove 14 is formed by recessing the inner sidewall of the winding groove 13 near the end, so that when the stepped edge 23 of the skeleton body 21 is inserted into the winding groove 13, sufficient space is provided for the stepped edge 23 to be placed. In this way, when the insulating skeleton 20 is assembled with the stator core 10, the stepped edge 23 will not protrude from the inside of the winding groove 13 in the circumferential direction, thereby effectively reducing the coil steps during winding.

[0032] In this embodiment of the invention, the thickness of the skeleton body 21 along the axial direction is H0, the depth of the first edging 24 along the axial direction is H1, and the depth of the second edging 25 along the axial direction is H2, satisfying the following relationships: 1.0mm≤H0≤1.8mm; 2.0mm≤H0+H1+H2. Secondly, the depth of the stepped groove 14 along the axial direction in this embodiment of the invention is Ha, satisfying the following relationship: 0.2mm≤Ha-(H1+H2)≤0.7mm. Furthermore, the width of the stepped groove 14 in this embodiment of the invention is Ta, and the thickness of the first edging 24 is T1, satisfying the following relationships: 0≤Ta-T1≤0.5mm; 0.5H1≤T1≤H1. Additionally, the thickness of the second edging 25 in this embodiment of the invention is T2, satisfying the following relationship: 0.2H2≤T2≤0.5H2.

[0033] Optionally, in some embodiments of the present invention, a stator pin 26 is provided on the end face of the insulating frame 20, and a stator slot 15 is provided on the end face of the stator yoke 11, with the stator pin 26 being inserted into the stator slot 15.

[0034] Therefore, according to the stator assembly of this utility model, based on the fact that the thickness of the main body 21 of the insulating frame 20 meets the insulation distance requirement, a stepped edge 23 is formed on the end face of the main body 21 for insertion and assembly with several winding grooves 13. The stepped edge 23 is designed as a first edge 24 and a second edge 25 distributed axially, with the thickness of the second edge 25 being less than the thickness of the first edge 24. Thus, when the stepped edge 23 is inserted into the stepped groove 14 of the winding groove 13, since the size of the second edge 25 is smaller than the size of the stepped groove 14, the stepped edge 23 can be inserted into the stepped groove without precise alignment. In section 14, the first edge 24 can also be quickly inserted into the stepped groove 14, greatly reducing the assembly difficulty between the insulating frame 20 and the stator core 10. In other words, the stator assembly of this utility model, based on the insulation distance of the frame body 21, uses the stepped groove 14 formed by the recess in the inner side wall of the winding groove 13 of the stator core 10 to make the inner side wall of the stepped edge 23 be located on the same side as the inner side wall of the winding groove 13, thereby effectively reducing the steps of the ineffective coil. Furthermore, the stepped edge 23, by adopting a stepped segmented design, can reduce the assembly difficulty between the insulating frame 20 and the stator core 10.

[0035] The following is combined Figures 1 to 6 The following detailed description is based on a specific embodiment of the stator assembly of the present invention. It is worth understanding that the following is merely an illustrative description and should not be construed as limiting the present invention.

[0036] This embodiment provides a stator assembly, including a stator core 10 and an insulating frame 20. The stator core 10 includes an annular stator yoke 11 and a plurality of stator teeth 12 spaced apart on the inner circumferential wall of the stator yoke 11. A winding groove 13 is formed between two adjacent stator teeth 12, and a stepped groove 14 is formed by a recess in the inner sidewall of the winding groove 13. The stepped groove 14 penetrates one end of the winding groove 13 in the axial direction. The insulating frame 20 includes an annular frame body 21. One end of the frame body 21 abuts against the end face of the stator core 10, and the frame body 21 has notches 22 spaced apart in the circumferential direction, the number of which is equal to the number of winding grooves 13. At the edge of each notch 22, a stepped edge 23 extends in the axial direction away from the frame body 21, and the stepped edge 23 is inserted into the stepped groove 14.

[0037] The stepped edging 23 is divided into a first edging 24 and a second edging 25 along the axial direction. The first edging 24 is connected to the main frame 21. The inner sidewall of the first edging 24 and the inner sidewall of the second edging 25 are located on the same side, and the thickness of the second edging 25 is less than the thickness of the first edging 24. Further, the second edging 25 is recessed inward from the outer sidewall of the stepped edging 23, so that the second edging 25 and the first edging 24 form a stepped shape, and a chamfer is provided at the connection between the second edging 25 and the first edging 24. In this embodiment, the inner sidewalls of the first edging 24, the second edging 25, and the winding groove 13 are located on the same side.

[0038] Specifically, the thickness of the main frame 21 along the axial direction is H0, the depth of the first edging 24 along the axial direction is H1, and the depth of the second edging 25 along the axial direction is H2, satisfying the following relationships: H0 = 1.0 mm; H0 + H1 + H2 = 2.0 mm. Secondly, the depth of the stepped groove 14 in this embodiment along the axial direction is Ha, satisfying the following relationship: Ha - (H1 + H2) = 0.2 mm. Furthermore, the width of the stepped groove 14 in this embodiment is Ta, and the thickness of the first edging 24 is T1, satisfying the following relationships: Ta - T1 = 0; T1 = 0.5H1. In addition, the thickness of the second edging 25 in this embodiment is T2, satisfying the following relationship: T2 = 0.2H2.

[0039] In addition, in this embodiment, a stator pin 26 is provided on the end face of the insulating frame 20, and a stator slot 15 is provided on the end face of the stator yoke 11. The stator pin 26 is inserted into the stator slot 15.

[0040] In addition, in this embodiment, insulating frames 20 are symmetrically provided at both ends of the stator core 10 along its axial direction.

[0041] The following is combined Figures 1 to 6The following detailed description is based on a specific embodiment of the stator assembly of the present invention. It is worth understanding that the following is merely an illustrative description and should not be construed as limiting the present invention.

[0042] This embodiment provides a stator assembly, including a stator core 10 and an insulating frame 20. The stator core 10 includes an annular stator yoke 11 and a plurality of stator teeth 12 spaced apart on the inner circumferential wall of the stator yoke 11. A winding groove 13 is formed between two adjacent stator teeth 12, and a stepped groove 14 is formed by a recess in the inner sidewall of the winding groove 13. The stepped groove 14 penetrates one end of the winding groove 13 in the axial direction. The insulating frame 20 includes an annular frame body 21. One end of the frame body 21 abuts against the end face of the stator core 10, and the frame body 21 has notches 22 spaced apart in the circumferential direction, the number of which is equal to the number of winding grooves 13. At the edge of each notch 22, a stepped edge 23 extends in the axial direction away from the frame body 21, and the stepped edge 23 is inserted into the stepped groove 14.

[0043] The stepped edging 23 is divided into a first edging 24 and a second edging 25 along the axial direction. The first edging 24 is connected to the main frame 21. The inner sidewall of the first edging 24 and the inner sidewall of the second edging 25 are located on the same side, and the thickness of the second edging 25 is less than the thickness of the first edging 24. Further, the second edging 25 is recessed inward from the outer sidewall of the stepped edging 23, so that the second edging 25 and the first edging 24 form a stepped shape, and a chamfer is provided at the connection between the second edging 25 and the first edging 24. In this embodiment, the inner sidewalls of the first edging 24, the second edging 25, and the winding groove 13 are located on the same side.

[0044] Specifically, the thickness of the main frame 21 along the axial direction is H0, the depth of the first edging 24 along the axial direction is H1, and the depth of the second edging 25 along the axial direction is H2, satisfying the following relationships: H0 = 1.4mm; H0 + H1 + H2 = 2.4mm. Secondly, the depth of the stepped groove 14 in this embodiment along the axial direction is Ha, satisfying the following relationship: Ha - (H1 + H2) = 0.5mm. Furthermore, the width of the stepped groove 14 in this embodiment is Ta, and the thickness of the first edging 24 is T1, satisfying the following relationships: Ta - T1 = 0.3mm; T1 = 0.8H1. In addition, the thickness of the second edging 25 in this embodiment is T2, satisfying the following relationship: T2 = 0.3H2.

[0045] In addition, in this embodiment, a stator pin 26 is provided on the end face of the insulating frame 20, and a stator slot 15 is provided on the end face of the stator yoke 11. The stator pin 26 is inserted into the stator slot 15.

[0046] In addition, in this embodiment, insulating frames 20 are symmetrically provided at both ends of the stator core 10 along its axial direction.

[0047] The following is combined Figures 1 to 6 The following detailed description is based on a specific embodiment of the stator assembly of the present invention. It is worth understanding that the following is merely an illustrative description and should not be construed as limiting the present invention.

[0048] This embodiment provides a stator assembly, including a stator core 10 and an insulating frame 20. The stator core 10 includes an annular stator yoke 11 and a plurality of stator teeth 12 spaced apart on the inner circumferential wall of the stator yoke 11. A winding groove 13 is formed between two adjacent stator teeth 12, and a stepped groove 14 is formed by a recess in the inner sidewall of the winding groove 13. The stepped groove 14 penetrates one end of the winding groove 13 in the axial direction. The insulating frame 20 includes an annular frame body 21. One end of the frame body 21 abuts against the end face of the stator core 10, and the frame body 21 has notches 22 spaced apart in the circumferential direction, the number of which is equal to the number of winding grooves 13. At the edge of each notch 22, a stepped edge 23 extends in the axial direction away from the frame body 21, and the stepped edge 23 is inserted into the stepped groove 14.

[0049] The stepped edging 23 is divided into a first edging 24 and a second edging 25 along the axial direction. The first edging 24 is connected to the main frame 21. The inner sidewall of the first edging 24 and the inner sidewall of the second edging 25 are located on the same side, and the thickness of the second edging 25 is less than the thickness of the first edging 24. Further, the second edging 25 is recessed inward from the outer sidewall of the stepped edging 23, so that the second edging 25 and the first edging 24 form a stepped shape, and a chamfer is provided at the connection between the second edging 25 and the first edging 24. In this embodiment, the inner sidewalls of the first edging 24, the second edging 25, and the winding groove 13 are located on the same side.

[0050] Specifically, the thickness of the main frame 21 along the axial direction is H0, the depth of the first edging 24 along the axial direction is H1, and the depth of the second edging 25 along the axial direction is H2, satisfying the following relationships: H0 = 1.8 mm; H0 + H1 + H2 = 2.0 mm. Secondly, the depth of the stepped groove 14 in this embodiment along the axial direction is Ha, satisfying the following relationship: Ha - (H1 + H2) = 0.7 mm. Furthermore, the width of the stepped groove 14 in this embodiment is Ta, and the thickness of the first edging 24 is T1, satisfying the following relationships: Ta - T1 = 0.5 mm; T1 = H1. In addition, the thickness of the second edging 25 in this embodiment is T2, satisfying the following relationship: T2 = 0.5H2.

[0051] In addition, in this embodiment, a stator pin 26 is provided on the end face of the insulating frame 20, and a stator slot 15 is provided on the end face of the stator yoke 11. The stator pin 26 is inserted into the stator slot 15.

[0052] In addition, in this embodiment, insulating frames 20 are symmetrically provided at both ends of the stator core 10 along its axial direction.

[0053] A second aspect of this invention provides an electric motor comprising the stator assembly described above. The electric motor according to this invention reduces the height of ineffective coils, lowers the assembly difficulty of the insulating frame 20 and the stator core 10, and improves the performance of the motor.

[0054] A third aspect of this invention provides a compressor that includes the motor described in any of the above-mentioned embodiments. According to the compressor of this invention, the height of the ineffective coil can be reduced, the assembly difficulty of the insulating frame 20 and the stator core 10 can be lowered, and the performance of the motor can be improved.

[0055] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of the stator assembly, motor, and compressor of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model.

Claims

1. A stator assembly, characterized in that: The device includes a stator core and an insulating frame. The stator core includes an annular stator yoke and a plurality of stator teeth spaced apart on the inner circumferential wall of the stator yoke. A winding slot is formed between two adjacent stator teeth, and a stepped groove is formed by a recess in the inner sidewall of the winding slot. The stepped groove passes through one end of the winding slot in the axial direction. The insulating frame includes an annular frame body. One end of the frame body abuts against the end face of the stator core, and the frame body has notches spaced apart in the circumferential direction at a number equal to the number of winding slots. At the edge of each notch, a stepped edging extends in the axial direction away from the frame body, and the stepped edging is inserted into the stepped groove.

2. The stator assembly according to claim 1, characterized in that: The stepped edging is divided into a first edging and a second edging along the axial direction. The first edging is connected to the main body of the skeleton. The inner sidewall of the first edging and the inner sidewall of the second edging are located on the same side. The thickness of the second edging is less than the thickness of the first edging.

3. The stator assembly according to claim 2, characterized in that: The second edging is recessed inward from the outer wall of the stepped edging, so that the second edging and the first edging form a stepped shape, and a chamfer is provided at the connection between the second edging and the first edging.

4. The stator assembly according to claim 2, characterized in that: The thickness of the main skeleton body along the axial direction is H0, the depth of the first edge along the axial direction is H1, and the depth of the second edge along the axial direction is H2, satisfying the following relationships: 1.0mm≤H0≤1.8mm; 2.0mm≤H0+H1+H2.

5. The stator assembly according to claim 4, characterized in that: The depth of the stepped groove along the axial direction is Ha, which satisfies the relationship: 0.2mm≤Ha-(H1+H2)≤0.7mm.

6. The stator assembly according to claim 4, characterized in that: The width of the stepped groove is Ta, and the thickness of the first edging is T1, satisfying the following relationships: 0≤Ta-T1≤0.5mm; 0.5H1≤T1≤H1.

7. The stator assembly according to claim 4, characterized in that: The thickness of the second edge is T2, which satisfies the relationship: 0.2H2≤T2≤0.5H2.

8. The stator assembly according to claim 1, characterized in that: The end face of the insulating frame is provided with a stator pin, and the end face of the stator yoke is provided with a stator slot, and the stator pin is engaged in the stator slot.

9. An electric motor, characterized in that: Includes the stator assembly according to any one of claims 1 to 8.

10. A compressor, characterized in that: Includes the motor according to claim 9.

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