Rotor structure and magnetic suspension motor

Abstract

The utility model provides a rotor structure and a magnetic suspension motor, and belongs to the technical field of magnetic suspension motors. The rotor structure comprises a rotor main shaft and permanent magnets, and the permanent magnets are fixed to the outer circumferential face of the rotor main shaft and arranged in the circumferential direction of the rotor main shaft in a surrounding mode. Wherein the permanent magnet comprises at least two magnetic units, and the magnetic units are mutually spliced; the rotor main shaft is provided with a cooling flow channel, and at least part of the cooling flow channel is located between the permanent magnet and the outer circumferential surface of the rotor main shaft and used for conveying a cooling medium to cool the permanent magnet; and the cooling flow channel is communicated with a gap between the magnetic units. According to the utility model, at least part of the cooling flow channel is directly contacted with the permanent magnet, so that the cooling medium in the cooling flow channel can be directly contacted with the permanent magnet, thereby improving the cooling effect of the cooling medium on the permanent magnet; and the cooling flow channel is communicated with the gap between the magnetic units, so that the contact area between the cooling medium and the magnetic units can be increased, and the cooling effect of the cooling medium on the magnetic units is optimized.

Description

Technical Field

[0001] The utility model belongs to the technical field of magnetic suspension motors, and in particular relates to a rotor structure and a magnetic suspension motor. Background Art

[0002] In a magnetic levitation motor, permanent magnets will generate a certain amount of heat when working. The accumulation of heat will cause the temperature to rise. Excessively high temperature will affect the performance and life of the permanent magnets, causing the magnetic properties of the permanent magnets to decrease or even cause the permanent magnets to lose their magnetism.

[0003] Therefore, it is necessary to cool the permanent magnet. In the prior art, there are many ways to cool the permanent magnet, such as conduction cooling, which dissipates the heat of the permanent magnet through heat-conducting materials, or wind cooling, which uses fans or air ducts to make the air around the permanent magnet flow and take away the heat dissipated by the permanent magnet. However, the cooling effect of the existing cooling methods is poor, and the temperature of the permanent magnet cannot be reduced during operation, which affects the normal use of the permanent magnet. Utility Model Content

[0004] The purpose of this application is to provide a rotor structure and a magnetic levitation motor to solve the above-mentioned technical problems existing in the prior art.

[0005] This application is implemented as follows:

[0006] In a first aspect, an embodiment of the present application provides a rotor structure, comprising a rotor main shaft and a permanent magnet, wherein the permanent magnet is fixed to the outer peripheral surface of the rotor main shaft and is arranged around the circumference of the rotor main shaft; wherein the permanent magnet comprises at least two magnetic units, and the magnetic units are spliced ​​with each other; the rotor main shaft has a cooling channel, at least part of which is located between the permanent magnet and the outer peripheral surface of the rotor main shaft, for transmitting a cooling medium to cool the permanent magnet; and the cooling channel is connected to the gap between the magnetic units.

[0007] In a second aspect, an embodiment of the present application provides a magnetic levitation motor, including the rotor structure provided in the embodiment of the first aspect.

[0008] The technical solution provided by this application can achieve the following beneficial effects:

[0009] In the present application, a cooling channel is provided to transmit a cooling medium to cool the permanent magnet; and at least part of the cooling channel is provided between the permanent magnet and the outer peripheral surface of the rotor main shaft, so that the cooling medium in the cooling channel can directly contact the permanent magnet, thereby improving the cooling effect of the cooling medium on the permanent magnet; and the cooling channel is provided close to the outer peripheral surface of the rotor main shaft, which has less influence on the structural strength of the rotor main shaft. Compared with the cooling channel provided inside the rotor main shaft, the cooling channel can be provided with a smaller size while maintaining the same heat dissipation effect, which can further reduce the influence of the cooling channel on the structural strength of the rotor main shaft; in addition, the gap between the cooling channel and the magnetic unit is connected, which is conducive to the cooling medium entering the gap between the magnetic units, thereby increasing the contact area between the cooling medium and the magnetic unit, optimizing the cooling effect of the cooling medium on the magnetic unit, and improving the heat dissipation effect of the cooling medium on the permanent magnet. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments of the utility model or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0011] Figure 1 This is an overall schematic diagram of the rotor structure provided in some embodiments of the present application. Figure 1 ;

[0012] Figure 2 is a cross-sectional view of a rotor structure from a first perspective provided in some embodiments of the present application;

[0013] Figure 3 is a cross-sectional view of a rotor structure from a second perspective provided in some embodiments of the present application;

[0014] Figure 4 is a schematic diagram of the coordination between the rotor main shaft and the permanent magnet provided in some embodiments of the present application;

[0015] Figure 5 This is a schematic diagram of the structure of the rotor main shaft provided in some embodiments of the present application. Figure 1 ;

[0016] Figure 6 This is a schematic diagram of the structure of the rotor main shaft provided in some embodiments of the present application. Figure 2 ;

[0017] Figure 7 This is a schematic diagram of the structure of the rotor main shaft provided in some embodiments of the present application. Figure 3 ;

[0018] Figure 8 This is an overall schematic diagram of the rotor structure provided in some embodiments of the present application. Figure 2 ;

[0019] Fig. 9 This is an overall schematic diagram of the rotor structure provided in some embodiments of the present application. Figure 3 .

[0020] In the figure: 100-rotor main shaft, 110-mounting groove, 120-cooling channel, 121-guide groove, 121a-first guide sub-groove, 121b-second guide sub-groove, 122-guide channel, 210-magnetic unit, 310-first splicing gap, 320-second splicing gap, 400-sheath tube, 410-heat dissipation groove. DETAILED DESCRIPTION

[0021] The following description provides many different embodiments or examples for implementing different features of the present invention. The components and arrangements described in the following specific examples are only used to simplify the present invention and are only used as examples, not to limit the present invention.

[0022] In some existing magnetic levitation motors, the rotor structure includes permanent magnets and a rotor spindle. The permanent magnets are mounted on the outer circumference of the rotor spindle. A cooling channel is provided inside the rotor spindle. The rotor spindle conducts part of the heat generated by the permanent magnets to the cooling channel for cooling. However, since the heat conduction between the cooling channel and the permanent magnets is carried out through the rotor spindle, the heat dissipation effect is poor. Therefore, in some products, the heat dissipation effect of the permanent magnets is enhanced by increasing the size of the cooling channel. However, when the size of the cooling channel is increased, the structural strength of the rotor spindle will be further reduced, thereby affecting the normal use of the rotor spindle.

[0023] In view of this, an embodiment of the present application provides a rotor structure, including a rotor main shaft 100 and a permanent magnet, wherein the permanent magnet is fixed to the outer peripheral surface of the rotor main shaft 100, and the permanent magnet is arranged around the circumference of the rotor main shaft 100, which can be referred to Figures 2 to 4 The permanent magnet can generate a stable magnetic field through its inherent magnetic properties, so as to suspend and guide the rotor main shaft 100, so that the rotor main shaft 100 can be stably suspended at a set position and be subjected to a stable magnetic force when rotating.

[0024] The permanent magnet includes at least two magnetic units 210, each of which is fixed to the outer circumference of the rotor main shaft 100, and the magnetic units 210 are spliced ​​with each other to form a preset shape on the outer circumference of the rotor main shaft 100. The rotor main shaft 100 has a cooling channel 120, and the cooling channel 120 is used to transmit a cooling medium, which can be a gas or a liquid. At least part of the cooling channel 120 is located between the permanent magnet and the outer circumference of the rotor main shaft 100, referring to Figures 2 to 4 In this layout, the cooling channel 120 can directly contact the permanent magnet. After the cooling medium enters the cooling channel 120, it can directly contact the permanent magnet and take away the heat emitted by the permanent magnet, thereby cooling the permanent magnet. Figure 3 As shown, the direction indicated by the dotted arrow represents the flow direction of the cooling medium. The cooling medium enters from one end of the cooling channel 120, takes away the heat of the permanent magnet and then flows out from the other end.

[0025] Compared with the structure in the prior art in which heat is conducted to the cooling channel through the rotor main shaft 100, the cooling channel 120 of the rotor structure provided in the embodiment of the present application is in direct contact with the permanent magnet, omitting the process of using the rotor main shaft 100 to conduct heat between the permanent magnet and the cooling channel 120, thereby improving the heat dissipation effect on the permanent magnet. In addition, the cooling channel 120 is arranged close to the outer peripheral surface of the rotor main shaft 100, and is not arranged in the central area of ​​the rotor main shaft 100, which has little effect on the structural strength of the rotor main shaft 100. In addition, compared with the cooling channel arranged inside the rotor main shaft 100, while maintaining the same heat dissipation effect, the size of the cooling channel 120 can be set smaller, which can further reduce the effect of setting the cooling channel 120 on the structural strength of the rotor main shaft 100.

[0026] In some preferred embodiments, the cooling channel 120 is connected to the gap between the magnetic unit 210. Figure 4 As shown. Since the magnetic units 210 are spliced, there is a gap between the two adjacent magnetic units 210 after splicing. After the cooling channel 120 is connected to the gap, the cooling medium in the cooling channel 120 can be filled into the gap, thereby increasing the contact area between the cooling medium and the magnetic units 210, optimizing the cooling effect of the cooling medium on the magnetic units 210, and improving the heat dissipation effect of the cooling medium on the permanent magnet. For one of the gaps between the magnetic units 210 that is connected to the cooling channel 120, the gap can be connected to the cooling channel 120 along the extension path, or a part of the gap can be connected to the cooling channel 120, so that the cooling medium in the cooling channel 120 can enter the gap between the magnetic units 210.

[0027] The permanent magnets can be directly fixedly mounted on the outer circumference of the rotor main shaft 100, and the cooling channel 120 is directly arranged on the outer circumference of the rotor main shaft 100. The permanent magnets cover part of the cooling channel 120, and part of the cooling channel 120 is exposed to the external environment to communicate with the external environment for heat dissipation. The end of the cooling channel 120 can be exposed to the outside, or a part of the cooling channel 120 can be exposed to the outside.

[0028] In some embodiments, the rotor main shaft 100 may be provided with a mounting groove 110 on its outer circumferential surface, and the mounting groove 110 is arranged around the circumference of the rotor main shaft 100. Figures 5 to 7 As shown. The mounting groove 110 preliminarily locates the installation position of the permanent magnet, and the axial ends of the mounting groove 110 abut against the permanent magnet to limit the permanent magnet and improve the installation stability of the permanent magnet and the rotor main shaft 100. Corresponding to the permanent magnet, at least part of the cooling channel 120 is arranged at the bottom of the mounting groove 110 to meet the purpose of the cooling medium transmitted in the cooling channel 120 being able to directly contact the permanent magnet. The end of the cooling channel 120 needs to pass through the surface of the rotor main shaft 100 to communicate with the external environment.

[0029] In some optional embodiments, the cooling channel 120 includes a guide groove 121 and a guide channel 122, the guide groove 121 is located between the permanent magnet and the outer peripheral surface of the rotor main shaft 100, and the gap between the magnetic units 210 is connected to the guide groove 121. There are two guide channels 122, and the two guide channels 122 are respectively located at both ends of the guide groove 121, and are connected to the guide groove 121, playing the role of inputting and outputting cooling medium. The guide channel 122 is generally not in direct contact with the permanent magnet. In some embodiments, when the rotor main shaft 100 is provided with a mounting groove 110, the guide channel 122 is arranged at the end wall of the mounting groove 110, and the guide channel 122 can be in direct contact with the permanent magnet.

[0030] The guide groove 121 has various extension directions. In some preferred embodiments of the present application, the guide groove 121 includes a first guide groove 121a, and the first guide groove 121a is arranged to extend along the axial direction of the rotor main shaft 100. Figures 4 to 6 As shown. The first guide groove 121a mainly conducts heat in the axial direction of the rotor main shaft 100, dissipates heat toward the two ends of the guide groove 121, balances the temperature of the permanent magnet, and avoids excessive heat accumulation in the middle of the permanent magnet, resulting in excessive temperature of some permanent magnets. In addition, the first guide groove 121a is arranged to extend along the axial direction of the rotor main shaft 100, and the resistance encountered by the cooling medium when flowing in the cooling channel 120 is small, which can avoid the situation where the cooling medium accumulates in the cooling channel 120 and cannot be discharged, which is conducive to ensuring the timely replacement of the cooling medium in the cooling channel 120.

[0031] Further preferably, the guide groove 121 includes, in addition to the first guide groove 121a, a second guide groove 121b connected to the first guide groove 121a, and the second guide groove 121b is arranged around the circumference of the rotor main shaft 100, which can be referred to Figure 6 The second guide groove 121b balances the temperature of the permanent magnet in the circumferential direction to prevent heat from accumulating in a certain area of ​​the permanent magnet. The second guide groove 121b cooperates with the first guide groove 121a to increase the distribution range of the cooling channel 120, thereby balancing the temperature of various parts of the permanent magnet.

[0032] The permanent magnet includes at least two magnetic units 210. Depending on the different arrangement directions of the magnetic units 210, the extension directions of the gaps formed between the magnetic units 210 are also different. In some preferred embodiments, the extension direction of the guide groove 121 is the same as the extension direction of the gap, so that on the extension path of the gap, the gap at any part is connected to the guide groove 121, increasing the area of ​​the flow part between the gap and the guide groove 121, so that the cooling medium located in the guide groove 121 can contact the magnetic unit 210 as much as possible, thereby improving the heat dissipation effect of the magnetic unit 210.

[0033] Exemplarily, some magnetic units 210 are arranged along the circumference of the rotor main shaft 100, and a first joint gap 310 is formed between two adjacent magnetic units 210. Figure 4 As shown. The first joint gap 310 is arranged to extend along the axial direction of the rotor main shaft 100, and the first joint gap 310 is correspondingly connected to the first guide groove 121a. When the cooling medium enters the cooling channel 120 to cool the permanent magnet, the cooling medium can enter the first joint gap 310 between two adjacent magnetic units 210, increase the contact area with the magnetic unit 210, expand the cooling area of ​​the cooling medium, and improve the cooling effect.

[0034] Exemplarily, some of the magnetic units 210 are arranged along the axial direction of the rotor main shaft 100, and a second joint gap 320 is formed between two adjacent magnetic units 210. Figure 4 As shown. The second splicing gap 320 is arranged to extend along the circumference of the rotor main shaft 100, and the second splicing gap 320 is correspondingly connected with the second guide slot 121b. Corresponding connection means that any part of the second splicing gap 320 is connected with the second guide slot 121b, and the cooling medium in the second guide slot 121b can quickly enter the second splicing gap 320, and the cooling medium in the second splicing gap 320 can be continuously exchanged with the cooling medium in the second guide slot 121b, thereby improving the cooling effect of the cooling medium on the permanent magnet.

[0035] In some embodiments, the permanent magnet has both a first splicing gap 310 and a second splicing gap 320, and the cooling medium can flow quickly in the gaps distributed vertically and horizontally among the multiple magnetic units 210, dividing the permanent magnet into multiple units for heat exchange, thereby improving the utilization rate of the cooling medium and enhancing the heat dissipation effect of the permanent magnet.

[0036] In the permanent magnet, there may be a plurality of first splicing gaps 310 and a plurality of second splicing gaps 320 at the same time, and some or all of the first splicing gaps 310 may be connected to the first guide slot 121a, and some or all of the second splicing gaps 320 may be connected to the second guide slot 121b. In some embodiments, there may be a plurality of magnetic units 210, and there may also be a plurality of cooling channels 120, but in order to reduce the influence of the cooling channels 120 on the structural strength of the rotor spindle 100, the number of cooling channels 120 will not be too many, and the number of gaps between the magnetic units 210 is generally greater than the number of cooling channels 120, and the first guide slot 121a and the second guide slot 121b corresponding to each cooling channel 120 should be connected to the corresponding gaps to make full use of the cooling channels 120.

[0037] In other embodiments of the present application, the guide groove 121 is spirally extended around the axis of the rotor main shaft 100, Figure 7 As shown. The spirally extended guide groove 121 can expand the coverage of the guide groove 121 in the circumferential direction of the rotor main shaft 100, so that the guide groove 121 can contact more magnetic units 210 and increase the contact area with the magnetic units 210. In addition, the spirally extended guide groove 121 cooperates with the rotational movement of the rotor main shaft 100 to prevent the cooling medium from accumulating in the guide groove 121, reduce the flow resistance of the cooling medium, increase the flow speed of the cooling medium, and increase the replacement frequency of the cooling medium in the guide groove 121, thereby improving the heat dissipation effect on the permanent magnet.

[0038] In some specific embodiments, a plurality of cooling channels 120 are provided, and the plurality of cooling channels 120 are evenly distributed in the circumferential direction of the rotor main shaft 100. Exemplarily, there are four cooling channels 120, and the four cooling media are distributed at intervals of 90 degrees in the circumferential direction of the rotor main shaft 100. Preferably, in the circumferential direction of the rotor main shaft 100, a total of eight magnetic units 210 are spliced ​​to form an annular structure, and the eight magnetic units 210 form eight first splicing gaps 310, wherein the four first splicing gaps 310 are connected and matched with the first guide grooves 121a of the cooling channel 120.

[0039] In some embodiments of the present application, the rotor structure further includes a sheath tube 400, which is sleeved outside the rotor main shaft 100. Figure 1The sheath tube 400 cooperates with the rotor main shaft 100, and the permanent magnet is abutted between the sheath tube 400 and the main shaft to fix the position of the permanent magnet, refer to Figure 2 and Figure 3 The permanent magnet is in contact with the sheath tube 400 and the rotor main shaft 100 at the same time. Part of the heat is dissipated through the cooling channel 120 provided on the rotor main shaft 100, and part of the heat is dissipated through the sheath tube 400. The outer wall of the sheath tube 400 is provided with a plurality of heat dissipation slots 410 arranged along its axial direction. Figures 1 to 3 , Figure 8 and Fig. 9 As shown, the heat dissipation slots 410 are used to conduct the heat generated by the permanent magnets to the external environment. A plurality of heat dissipation slots 410 are arranged along the axial direction of the rotor main shaft 100 to balance the temperature of the permanent magnets in the axial direction of the rotor main shaft 100 .

[0040] In some preferred embodiments of the present application, the heat dissipation slots 410 are arranged around the circumference of the rotor main shaft 100. The heat dissipation slots 410 simultaneously dissipate heat for multiple magnetic units 210 in the circumferential direction of the rotor main shaft 100. In addition, when the guide slots 121 only extend in the axial direction of the rotor main shaft 100, the heat dissipation slots 410 extending in the circumferential direction of the rotor main shaft 100 can make up for the insufficient heat dissipation of the cooling channel 120, so that the temperature of the permanent magnets is more balanced.

[0041] In some embodiments of the present application, the heat dissipation slots 410 have different widths along the circumference of the rotor main shaft 100. The width of the portion of the heat dissipation slot 410 corresponding to the cooling channel 120 is a first width, and the portion of the heat dissipation slot 410 not corresponding to the cooling channel 120 is a second width. The heat dissipation slot 410 corresponds to the cooling channel 120, which means that in the radial direction of the rotor main shaft 100, if part of the heat dissipation slot 410 and the cooling channel 120 are in the same radial direction, then the part of the heat dissipation slot 410 corresponds to the cooling channel 120, and the part of the heat dissipation slot 410 not in the same radial direction as the cooling channel 120 does not correspond to the cooling channel 120.

[0042] The first width dimension is smaller than the second width dimension, reference Figure 8 As shown, the first width dimension is marked with letter a, and the second width dimension is marked with letter b. Since the cooling channel 120 can dissipate heat for the permanent magnet, the first width dimension of the heat dissipation slot 410 can be set to be smaller; the part of the permanent magnet corresponding to the second width dimension cannot dissipate heat through the cooling channel 120, so the second width dimension needs to be set to be larger. In this way, with the cooperation of the sheath tube 400 and the cooling channel 120, the heat dissipation of each part of the permanent magnet is stable, and the overall temperature of the permanent magnet is stable.

[0043] During the heat dissipation of the permanent magnet, the axial ends of the permanent magnet have better heat dissipation effect than the middle area. The magnetic units 210 at the two ends are in contact with the external environment or the rotor main shaft 100, so the heat is more easily transferred out. The heat in the middle of the permanent magnet is not easy to transfer out and is more likely to accumulate. In some embodiments of the present application, the width dimension of the heat dissipation slot 410 near the end of the permanent magnet is smaller than the width dimension of the heat dissipation slot 410 away from the end of the permanent magnet. Fig. 9 As shown, the width dimension of the heat dissipation slot 410 near the end of the permanent magnet is marked as c, and the width dimension of the heat dissipation slot 410 far from the end of the permanent magnet is marked as d, and the dimension c is smaller than the dimension d. The larger the dimension d is, the better the heat dissipation effect on the permanent magnet is, which can compensate for the heat accumulation in the middle of the permanent magnet and avoid the heat accumulation in the middle area of ​​the permanent magnet.

[0044] An embodiment of the present application also provides a magnetic levitation motor, comprising a rotor structure provided by any of the above embodiments.

[0045] The above description is only 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 in the protection scope of the present invention.

Claims

1. A rotor structure, characterized in that: It comprises a rotor main shaft (100) and a permanent magnet, wherein the permanent magnet is fixed to the outer peripheral surface of the rotor main shaft (100) and is arranged around the circumference of the rotor main shaft (100); The permanent magnet comprises at least two magnetic units (210), and the magnetic units (210) are spliced ​​with each other; the rotor main shaft (100) has a cooling channel (120), at least a portion of the cooling channel (120) is located between the permanent magnet and the outer peripheral surface of the rotor main shaft (100), and is used to transmit a cooling medium to cool the permanent magnet; The cooling channel (120) is connected to the gap between the magnetic unit (210).

2. A rotor structure according to claim 1, characterized in that: The cooling flow channel (120) comprises a guide groove (121) located between the permanent magnet and the outer peripheral surface of the rotor main shaft (100), the guide groove (121) comprising a first guide sub-groove (121a), and the first guide sub-groove (121a) is extended along the axial direction of the rotor main shaft (100).

3. A rotor structure according to claim 2, characterized in that: The guide groove (121) further comprises a second guide sub-groove (121b), the second guide sub-groove (121b) being connected to the first guide sub-groove (121a), and the second guide sub-groove (121b) being arranged around the circumference of the rotor main shaft (100).

4. A rotor structure according to claim 3, characterized in that: In the circumferential direction of the rotor main shaft (100), a first splicing gap (310) is provided between two adjacent magnetic units (210), the first splicing gap (310) is extended along the axial direction of the rotor main shaft (100), and the first splicing gap (310) is correspondingly connected to the first guide groove (121a); And / or, in the axial direction of the rotor main shaft (100), a second splicing gap (320) is provided between two adjacent magnetic units (210), the second splicing gap (320) is arranged around the circumference of the rotor main shaft (100), and the second splicing gap (320) is correspondingly connected to the second guide groove (121b).

5. A rotor structure according to claim 1, characterized in that: The cooling flow channel (120) comprises a guide groove (121) located between the permanent magnet and the outer peripheral surface of the rotor main shaft (100), and the guide groove (121) is spirally extended around the axis of the rotor main shaft (100); And / or, there are a plurality of cooling channels (120), and the plurality of cooling channels (120) are evenly distributed in the circumferential direction of the rotor main shaft (100).

6. A rotor structure according to claim 1, characterized in that: The rotor structure further comprises a sheath tube (400), the sheath tube (400) being sleeved outside the rotor main shaft (100) so as to abut the permanent magnet between the sheath tube (400) and the rotor main shaft (100), and the outer side wall of the sheath tube (400) being provided with a plurality of heat dissipation grooves (410) arranged along its axial direction.

7. A rotor structure according to claim 6, characterized in that: The heat dissipation groove (410) is arranged around the circumference of the rotor main shaft (100).

8. A rotor structure according to claim 7, characterized in that: The width dimension of a portion of the heat dissipation groove (410) corresponding to the cooling channel (120) is a first width dimension, and the width dimension of a portion of the heat dissipation groove (410) not corresponding to the cooling channel (120) is a second width dimension, and the first width dimension is smaller than the second width dimension.

9. A rotor structure according to claim 6, characterized in that: The width dimension of the portion of the heat dissipation groove (410) close to the end of the permanent magnet is smaller than the width dimension of the portion of the heat dissipation groove (410) far from the end of the permanent magnet.

10. A magnetic levitation motor, characterized in that: The invention comprises a rotor structure as described in any one of claims 1 to 9.

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