Inverter cabinet, air conditioning system

Abstract

This invention provides a frequency converter cabinet and an air conditioning system. The frequency converter cabinet includes a housing with an opening and a door capable of closing the opening. The door is detachably connected to the housing. The housing includes two side walls spaced apart from each other and a rear wall connected between the two side walls. A top cover is detachably connected to the top of the two side walls and the rear wall to keep the top of the housing closed. According to this invention, the detachable top cover allows some electrical components inside the housing to be installed, removed, and maintained through the top of the housing. The components inside the housing can be arranged more compactly, forming a front-to-back layered layout, eliminating the need to disassemble components in the front layer when installing or maintaining components in the rear layer. This greatly facilitates the installation, removal, and maintenance process, improves work efficiency, and reduces the overall size of the cabinet. The smaller cabinet size allows for further improvement in its protection level and a corresponding increase in power density.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of air conditioning, and particularly relates to a frequency converter cabinet and an air conditioning system. BACKGROUND

[0002] With the continuous progress and development of electronic technology under the current situation, the development of frequency converter technology and equipment is increasingly perfect. For high-power frequency converters, they have been widely used in heavy industry, water supply construction systems, central air conditioning, elevator operation and other fields. However, the development of domestic frequency converters has not yet formed a complete system, and the structure design of the frequency converter is not mature. Based on the convenience requirements of disassembly and maintenance of components, the current high-power frequency converters are large in size, low in protection level, difficult to install and maintain, and cannot meet the development requirements of miniaturization, high power density and high protection of frequency converters. SUMMARY

[0003] Therefore, the present application provides a frequency converter cabinet and an air conditioning system, which can overcome the shortcomings of large size and non-compact design layout of the frequency converter in the related art for the convenience of disassembly and maintenance of electrical components in the cabinet.

[0004] In order to solve the above problems, the present application provides a frequency converter cabinet, which comprises a cabinet with an opening and a door body capable of closing the opening, the door body is detachably connected to the cabinet, the cabinet comprises two side walls arranged opposite to each other and a rear wall connected between the two side walls, and the top ends of the two side walls and the rear wall are detachably connected with a top cover to make the top of the cabinet in a closed state.

[0005] In some embodiments, the top ends of the two side walls and the rear wall have a bending plane extending towards the inside of the cabinet, and the top cover is connected with the bending plane through a threaded part; and / or, a support is connected between the top ends of the two side walls, and the support is located at one side of the door body.

[0006] In some embodiments, one of the two side walls has a first maintenance opening, and a first shell plate is detachably connected to the first maintenance opening, and a bearing power supply is connected to one side of the first shell plate towards the inside of the cabinet.

[0007] In some embodiments, a main control component is assembled inside the cabinet, and the main control component comprises a main control assembly frame, the main control assembly frame has at least two layers from one side of the door body towards the inside of the cabinet, and the innermost layer is a capacitor module assembly layer for assembling capacitors and busbars, and the assembly entrance of the capacitor module assembly layer is matched with the position of the first maintenance opening.

[0008] In some embodiments, the main control assembly frame has a first side plate which is parallel and spaced apart from the first housing plate, and the first side plate has a capacitor disassembly and assembly operation hole corresponding to the position of the capacitor module assembly layer.

[0009] In some embodiments, the main control assembly frame further comprises a power component assembly layer which is located on the side of the capacitor module assembly layer close to the door body.

[0010] In some embodiments, the main control assembly frame further comprises an opening and closing assembly layer which is hinged to the side of the power component assembly layer close to the door body.

[0011] In some embodiments, the opening and closing assembly layer has a first side close to the door body and a second side close to the power component assembly layer, and a motor plate is assembled on the first side and a main controller is assembled on the second side.

[0012] In some embodiments, the cabinet further comprises a main control wiring board and a frequency converter wiring board, and the frequency converter wiring board is connected to the top of the main control assembly frame in an inclined manner relative to the horizontal plane.

[0013] In some embodiments, the cabinet further comprises a control device which is located on the top of the main control assembly frame and above the frequency converter wiring board.

[0014] In some embodiments, the cabinet has a bottom support frame, and the cabinet further comprises a rear vertical wall connected between the two side vertical walls, and the bottoms of the two side vertical walls and the rear vertical wall are fixedly connected to three adjacent corresponding side surfaces of the bottom support frame, and the bottom of the main control assembly frame is detachably connected to the top surface of the bottom support frame.

[0015] In some embodiments, the bottom support frame is a hollow structure, and a cabinet circulating cooling component is arranged in the hollow area.

[0016] In some embodiments, the cabinet circulating cooling component comprises an air duct shell which forms an air flow duct of the cabinet circulating cooling component with the wall of the cabinet and / or the bottom support frame, and an evaporator assembly and a fan assembly are arranged in the air duct shell.

[0017] In some embodiments, the air duct shell is provided with an air inlet and an air outlet, the evaporator assembly and the fan assembly are arranged corresponding to the air inlet and the air outlet respectively, and the main control assembly frame is located in the upper area of the air outlet.

[0018] In some embodiments, the fan assembly comprises a fan mounting member and a fan assembled on the fan mounting member, the air duct housing has a first assembly opening, the fan mounting member is pullably connected in the air duct housing through the first assembly opening; and / or, the evaporator assembly comprises an evaporator mounting plate, the rear vertical plate has a second assembly opening penetrating into the air duct housing, the evaporator assembly is pullably connected in the air duct housing through the second assembly opening.

[0019] In some embodiments, the cabinet further comprises a bottom wall at the bottom of the bottom support frame, and a drain pipe is detachably connected to the bottom wall.

[0020] The application further provides an air conditioning system comprising the above frequency converter cabinet.

[0021] The frequency converter cabinet and the air conditioning system provided by the application can realize the maintenance of the electrical components in the cabinet through the top of the cabinet due to the detachable top cover, so that the electrical components in the cabinet can be arranged more compactly, and the front and rear layers of the cabinet can be formed without the need to disassemble the components in the front layer when the components in the rear layer are maintained, which greatly facilitates the maintenance process, improves the work efficiency, and reduces the overall volume of the cabinet. The smaller volume of the cabinet can facilitate the further improvement of the protection level and the improvement of the power density. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 FIG. 1 is a perspective view of the frequency converter cabinet of the application (the cabinet door is in an open state);

[0023] Figure 2 FIG. 2 is a perspective view of the main control assembly frame in FIG. 1; Figure 1 FIG. 3 is a perspective view of the assembly relationship between the main control assembly frame and the bottom support frame in FIG. 1;

[0024] Figure 3 FIG. 4 is a perspective view of the cabinet in FIG. 1 from another angle; Figure 2 FIG. 5 is a perspective view of the cabinet in FIG. 1 from another angle;

[0025] Figure 4 FIG. 6 is an exploded view of the frequency converter cabinet in FIG. 1 (the arrows in the figure indicate the assembly path of the related components); Figure 1 FIG. 7 is an exploded view of the frequency converter cabinet in FIG. 1 from another angle (the arrows in the figure indicate the assembly path of the related components);

[0026] Figure 5 FIG. 8 is an exploded view of the frequency converter cabinet in FIG. 1 from another angle (the arrows in the figure indicate the assembly path of the related components); Figure 4 FIG. 9 is an exploded view of the frequency converter cabinet in FIG. 1 from another angle (the arrows in the figure indicate the assembly path of the related components);

[0027] Figure 6 FIG. 10 is an exploded view of the frequency converter cabinet in FIG. 1 from another angle (the arrows in the figure indicate the assembly path of the related components); Figure 1a bottom view (the arrow in the figure indicates the assembly path of the relevant components).

[0028] The reference signs are indicated as:

[0029] 1, main control component; 2, terminal block component; 3, in-box circulating heat dissipation component; 4, control device; 5, strong current device; 6, top cover; 7, opening and closing assembly layer; 8, power component assembly layer; 9, capacitor module assembly layer; 10, capacitor disassembly and assembly operation hole; 11, main controller; 12, motor board; 13, capacitor; 14, busbar; 16, heat sink; 17, power module; 18, capacitor fixing member; 21, main control terminal block; 22, frequency converter terminal block; 23, main control terminal block sheet metal; 24, frequency converter terminal block sheet metal; 31, air duct shell; 32, fan mounting member; 33, fan; 34, evaporator assembly; 35, drain pipe; 36, square sheet metal; 41, rectangular sheet metal; 42, fixed channel steel; 43, charging resistor; 51, bearing power supply; 52, first housing plate; 53, wiring sheet metal. DETAILED DESCRIPTION

[0030] For reference Figures 1 to 6 As shown, according to the embodiment of the present application, a frequency converter cabinet is provided, which comprises a cabinet with an opening (which can be formed by bending and full welding of a sheet metal piece) and a door body capable of closing the opening, the door body being detachably connected to the cabinet, the cabinet comprising two side walls arranged in opposite directions and a rear wall connected between the two side walls, and a top cover 6 being detachably connected to the top ends of the two side walls and the rear wall to make the top of the cabinet in a closed state. In this technical solution, in addition to the opening corresponding to the door body, the cabinet can be disassembled and maintained for the electrical components in the cabinet on the front surface of the cabinet, and the detachable top cover 6 can enable the electrical components in part of the cabinet to be disassembled and maintained through the top of the cabinet. In this way, the electrical components in the cabinet can be more compactly laid out, and a front and rear layered layout of the cabinet can be formed, without the need to disassemble the components in the front layer when disassembling or maintaining the components in the rear layer. This greatly facilitates the disassembly and maintenance process, improves work efficiency, and the overall volume of the cabinet is smaller, and the smaller cabinet volume can facilitate further improvement of the protection level, and the power density is also improved accordingly. In one embodiment, the two side walls and the rear wall are formed into a generally U-shaped structure by bending a sheet metal piece, thereby ensuring the sealing of the cabinet and improving the protection level of the frequency converter cabinet.

[0031] In some embodiments, the top ends of the two side walls and the rear wall have bending planes extending towards the inside of the cabinet, the top cover 6 is connected with the bending planes through screws, the bending planes can effectively support the top cover 6, facilitating the disassembly and assembly of the top cover 6. A support is further connected between the top ends of the two side walls, the support is located at one side of the door body, and the two side walls and the rear wall are connected into a rectangular frame through the support, thereby ensuring the structural stability and strength of the cabinet after the top cover 6 is disassembled. The support is, for example, a sheet metal part, which, together with the bending planes of the two side walls and the rear wall, forms a disassembly and assembly plane of the top cover 6, and the two ends of the support can be respectively welded with the two side walls, thereby ensuring the reliable stability of the cabinet structure.

[0032] In some embodiments, one of the two side walls has a first access hole, and a first shell plate 52 is detachably connected to the first access hole. The first shell plate 52 is connected to a bearing power supply 51 on the side facing the inside of the cabinet. The bearing power supply 51 supplies power to the magnetic suspension bearing of the compressor of the air conditioning system. In this technical solution, the disassembly and assembly of the bearing power supply 51 is performed through the first access hole, without the need to pass through the opening area of the cabinet. In this way, the bearing power supply 51 can be located inside the cabinet, and other necessary components can be stacked on the outside of the bearing power supply 51, without affecting the disassembly and assembly of the bearing power supply 51.

[0033] The inside of the cabinet is assembled with a main control component 1, which includes a main control assembly frame, i.e., the main control assembly frame is an assembly carrier of various electrical components of the main control component 1. The main control assembly frame has at least two layers on the side of the door body facing the inside of the cabinet. The innermost layer is a capacitor module assembly layer 9 for assembling capacitors 13 and busbars 14. The assembly entrance of the capacitor module assembly layer 9 is matched with the position of the first access hole, i.e., the disassembly and assembly of the capacitors 13 and the busbars 14 in the innermost capacitor module assembly layer 9 can be performed through the first access hole after they are assembled in the cabinet. At this time, it is not necessary to disassemble the various components on the outside, and maintenance is more convenient. When the capacitors 13 and the busbars 14 are assembled for the first time, since the main control assembly frame is not assembled in the cabinet, the capacitors 13 and the like can be assembled on the main control assembly frame outside the cabinet. However, when the main control assembly frame is once assembled in the cabinet, the disassembly and assembly of the capacitors 13 and the busbars 14 are realized through the first access hole, which is particularly convenient.

[0034] Specifically, the inverter cabinet also has a high-voltage component 5, which is installed on one of the two side walls. The high-voltage component 5 (board) is connected to a 540V DC voltage. Two bearing power supplies 51 are bolted to the detachable first outer shell plate 52. If it is necessary to disassemble or assemble the busbar 14 and the capacitor 13, the two bearing power supplies 51 can be disassembled or assembled along with the first outer shell plate 52 first, and then the busbar 14 or the capacitor 13 can be disassembled or assembled. The wiring sheet metal 53 can be used to fix the wires of the high-voltage component 5 and guide the wiring path.

[0035] The main control assembly frame has a first side plate, which is parallel and spaced apart from the first outer shell plate 52. The capacitor 13 is connected to the first side plate through a capacitor fixing part 18 (e.g., a bent sheet metal part with a threaded hole). The first side plate has a capacitor disassembly and assembly operation hole 10 at the position corresponding to the capacitor module assembly layer 9. The connection relationship of the aforementioned capacitor fixing part 18 can be made through the capacitor disassembly and assembly operation hole 10, so that the capacitor 13 can be separated from the main control assembly frame. Specifically, it can be further separated through the channel formed after the top cover is removed.

[0036] In some embodiments, the main control assembly frame also includes a power component assembly layer 8, which is located on the side of the capacitor module assembly layer 9 near the door. The power component assembly layer 8 is used to assemble the power module 17 and the corresponding heat sink 16, etc. It is located outside the capacitor module assembly layer 9 and will not obstruct the assembly components inside the capacitor module assembly layer 9.

[0037] The main control assembly frame also includes an opening and closing assembly layer 7, which is hinged to the side of the power component assembly layer 8 near the door. It can be opened or closed as needed (whether maintenance is required) to prevent obstruction of the power component assembly layer 8 during maintenance. The opening and closing assembly layer 7 has a first side near the door and a second side near the power component assembly layer 8. A motor board 12 is assembled on the first side, and a main controller 11 is assembled on the second side, thus achieving compatible integration of the motor board 12 and the main controller 11. The motor board 12 and the main controller 11 are located on the outermost layer, preventing potential heat dissipation problems that might occur if they were located internally.

[0038] In one specific embodiment, the main control component 1 includes a main controller 11, a motor board 12, a capacitor 13, a busbar 14, and a power module 17. The main controller 11 and the motor board 12 are mounted on the frame of the opening and closing assembly layer 7 (first layer) (which can be considered as a revolving door), with the motor board 12 mounted on the front and the main controller 11 mounted on the back. The heat sink 16 is mounted on the fixed sheet metal of the power component assembly layer 8 (second layer), and the power module 17 is mounted on the surface of the heat sink 16. The bottom bolts of the capacitor 13 are first installed on the capacitor fixing part 18, and then installed on the fixed sheet metal of the capacitor module assembly layer 9 (third layer), which is provided with capacitor disassembly and assembly operation holes 10 (see...).Figure 3 The capacitor 13 can be installed and removed by directly operating the bottom bolts of the capacitor 13 or by operating the capacitor fixing component 18; the busbar 14 is bolted between the capacitor 13 and the power module 17 on the right side of the main control component 1 (see...). Figure 4 ).

[0039] In some embodiments, the enclosure also houses a terminal block component 2, such as a main control terminal block 21 and a frequency converter terminal block 22. The frequency converter terminal block 22 is connected to the top of the main control assembly frame at an angle (e.g., 45°) relative to the horizontal plane. This reduces obstruction of other components in the top area, provides a wider field of vision for the operator, and facilitates wiring operations. The frequency converter terminal block 22 can be assembled via a frequency converter terminal block sheet metal 24 and connected to the main control assembly frame through the sheet metal 24. The sheet metal 24 has oblong through holes on both sides for wires to pass through, for fixing and preventing clutter. The sheet metal folded edges have grounding holes and wiring fixing holes. The grounding holes are used for grounding communication lines, and the wiring fixing holes are used to fix the wires. The main control terminal block 21 only connects to the wires required by the main controller 11 and is installed on the main control terminal block sheet metal 23. The main control terminal block sheet metal 23 has grounding holes on its folded edges for grounding communication wires. If the main controller 11 is not installed, it can be removed directly and synchronously.

[0040] Correspondingly, a control device 4 is also assembled inside the enclosure. The control device 4 is located at the top of the main control assembly frame and above the inverter terminal block 22. Since the control device 4 consists mostly of switching components with changing states, placing it above the inverter terminal block 22 facilitates the operator's observation of its status. The inverter terminal block 22 is assembled onto the main control assembly frame so that it can be installed or removed synchronously with the main controller 11. The aforementioned control device 4 is a component composed of various logic control devices, which may include circuit breakers, relays, contactors, etc., depending on the design requirements. The control device 4 is mounted on a rectangular sheet metal 41, allowing for modular installation and disassembly. The rectangular sheet metal 41 is supported by fixed channel steel 42 on both sides, and the space created by the support is used to install charging resistors 43, achieving modularity and making full use of space.

[0041] In some embodiments, the enclosure has a bottom support frame, and the bottoms of the two side walls and the rear wall are fixedly connected to three adjacent corresponding side walls of the bottom support frame to meet the protection level requirements of the enclosure. The bottom of the main control assembly frame is detachably connected to the top surface of the bottom support frame, that is, the bottom of the main control assembly frame is supported by the bottom support frame, and the structure is reliable and stable. Furthermore, the top of the main control assembly frame can also be reliably connected to the rear wall through threaded connectors.

[0042] The bottom support frame has a hollow structure, and an internal circulation heat dissipation component 3 is set in the hollow area. By setting the internal circulation heat dissipation component 3 in the hollow area, that is, in the bottom area of ​​the box, the structure of the entire box can be made more compact and the layout more reasonable. This method can effectively reduce the width of the box, which is especially suitable for situations where the space is narrow. The appearance of the box is also more regular, and there will be no situation where a heat dissipation component protrudes from one side wall as in the prior art.

[0043] In some embodiments, the internal circulating heat dissipation component 3 includes a duct housing 31. The duct housing 31, together with the walls of the enclosure and / or the bottom support frame, forms an airflow duct for the internal circulating heat dissipation component. An evaporator assembly 34 and a fan assembly are housed within the duct housing 31. An air inlet and an air outlet are constructed on the duct housing 31. The evaporator assembly 34 and the fan assembly are respectively positioned corresponding to the air inlet and air outlet, and the main control assembly frame is located in the upper region of the air outlet, thereby achieving efficient heat dissipation for various components within the enclosure, especially the main control component 1. Specifically, the evaporator assembly 34 can be a refrigerant heat exchanger, which uses refrigerant from the air conditioning system to efficiently dissipate heat from the enclosure. The internal circulating heat dissipation effectively ensures the insulation protection level of the inverter cabinet.

[0044] In some embodiments, the fan assembly includes a fan mounting member 32 and a fan 33 assembled on the fan mounting member 32. The duct housing 31 has a first assembly port, through which the fan mounting member 32 is removably connected to the duct housing 31. And / or, the evaporator assembly 34 includes an evaporator mounting plate, with a second assembly port extending into the duct housing 31 on the rear upright plate. The evaporator assembly 34 is removably connected to the duct housing 31 through the second assembly port. That is, both the fan assembly and the evaporator assembly 34 can be disassembled and assembled from the duct housing 31 using a drawer-type pull-out structure, making maintenance and disassembly very convenient.

[0045] In some embodiments, the enclosure also includes a bottom wall located at the bottom of the bottom support frame. A drain pipe 35 is detachably connected to the bottom wall. During transportation of the inverter cabinet, the drain pipe 35 is removed from the bottom wall, allowing the inverter cabinet to be placed stably on the transport vehicle's structure without the need for additional overhead structures. This ensures the reliable stability of the inverter cabinet during transportation and effectively prevents potential damage to the drain pipe 35. Specifically, the drain pipe 35 can be welded to a square sheet metal 36, through which a detachable connection to the bottom wall is achieved.

[0046] According to an embodiment of the present invention, an air conditioning system is also provided, including the frequency converter cabinet described above.

[0047] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0048] The above are merely preferred embodiments of the present invention and are 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 are merely preferred embodiments 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 frequency converter cabinet comprising a cabinet having an opening and a door body capable of closing the opening, the door body being detachably connected to the cabinet, characterized in that, The box comprises two side walls and a rear wall, the top of the box is closed by a top cover (6), one of the side walls has a first access hole, the first access hole is connected with a first cover plate (52), the first cover plate (52) is connected with a bearing power supply (51) on the side facing the inside of the box, the inside of the box is assembled with a main control component (1), the main control component (1) comprises a main control assembly frame, the main control assembly frame has at least two layers on the side of the door body facing the inside of the box, the innermost layer is a capacitor module assembly layer (9) for assembling capacitors (13) and busbars (14), the assembly entrance of the capacitor module assembly layer (9) is matched with the position of the first access hole, so that the capacitors (13) and busbars (14) in the innermost capacitor module assembly layer (9) can be assembled and disassembled through the first access hole after being assembled in the box, the main control assembly frame further comprises a power component assembly layer (8) on the side of the capacitor module assembly layer (9) close to the door body, the main control assembly frame further comprises an opening and closing assembly layer (7) hinged on the side of the power component assembly layer (8) close to the door body, the opening and closing assembly layer (7) has a first side close to the door body and a second side close to the power component assembly layer (8), the first side is assembled with a motor plate (12), and the second side is assembled with a main controller (11).

2. The frequency changer cabinet of claim 1, wherein, The top of the two side walls and the rear wall has a bending plane extending towards the inside of the box, the top cover (6) is connected with the bending plane through a threaded part, and / or a support is connected between the top ends of the two side walls, and the support is on the side of the door body.

3. The frequency changer cabinet of claim 1, wherein, The main control assembly frame has a first side plate, the first side plate is arranged in parallel and spaced apart with the first cover plate (52), and the first side plate has a capacitor disassembly operation hole (10) corresponding to the position of the capacitor module assembly layer (9).

4. The frequency changer cabinet of claim 1, wherein, The box is further assembled with a main control wiring board (21) and a frequency converter wiring board (22), wherein the frequency converter wiring board (22) is connected on the top of the main control assembly frame in an inclined manner relative to the horizontal plane.

5. The frequency changer cabinet of claim 4, wherein, The box is further assembled with a control device (4), the control device (4) is on the top of the main control assembly frame and in the upper area of the frequency converter wiring board (22).

6. The frequency changer cabinet of claim 1, wherein, The box has a bottom support frame, the bottoms of the two side walls and the rear wall are fixedly connected on three adjacent corresponding side surfaces of the top surface of the bottom support frame, and the bottom of the main control assembly frame is detachably connected on the top surface of the bottom support frame.

7. The frequency changer cabinet of claim 6, wherein, The bottom support frame is a hollow structure, and an in-box circulating heat dissipation component (3) is arranged in the hollow area.

8. The frequency changer cabinet of claim 7, wherein, The in-box circulating heat dissipation component (3) comprises an air duct shell (31) which forms an air flow air duct of the in-box circulating heat dissipation component with the wall of the box body and / or the bottom support frame, and an evaporator assembly (34) and a fan assembly are arranged in the air duct shell (31).

9. The frequency changer cabinet of claim 8, wherein, An air inlet and an air outlet are arranged on the air duct shell (31), the evaporator assembly (34) and the fan assembly are arranged corresponding to the air inlet and the air outlet respectively, and the main control assembly frame is arranged in the upper region of the air outlet.

10. The frequency changer cabinet of claim 9, wherein, The fan assembly comprises a fan mounting member (32) and a fan (33) assembled on the fan mounting member (32), the air duct shell (31) is provided with a first assembly opening, and the fan mounting member (32) is pullably connected in the air duct shell (31) through the first assembly opening; and / or the evaporator assembly (34) comprises an evaporator mounting plate, the rear vertical wall is provided with a second assembly opening penetrating into the air duct shell (31), and the evaporator assembly (34) is pullably connected in the air duct shell (31) through the second assembly opening.

11. The frequency changer cabinet of claim 6 wherein, The box body further comprises a bottom wall arranged at the bottom of the bottom support frame, and a drain pipe (35) is detachably connected to the bottom wall.

12. An air conditioning system characterized by, The frequency converter cabinet comprises the in-box circulating heat dissipation component according to any one of claims 1 to 11.

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