An anti-arc structure for a distribution box and the distribution box itself.

Abstract

This invention provides an arc-proof structure and distribution box for a power distribution box. Multiple arc-blocking plates are pre-fixed by a positioning frame. Each arc-blocking plate has an air bladder near its top edge adjacent to an electrical component. The air bladder aligns one-to-one with a first slot on the wiring terminal of the electrical component, allowing for simultaneous installation of multiple arc-blocking plates with high efficiency. The positioning frame also includes an inflation component for controlling the inflation of the air bladder. After the arc-blocking plate engages with the first slot, the air bladder inflates, securing the arc-blocking plate within the slot. The flexible fastening of the air bladder buffers mechanical vibrations, reducing the risk of loosening. Continuous air pressure ensures reliable fastening even in low-temperature environments. This invention effectively reduces the impact of mechanical vibrations and environmental temperature changes on the installation stability of the arc-blocking plates, improving the reliability of the arc-proof structure of the power distribution box.

Description

Technical Field

[0001] This invention relates to the field of electrical technology, and in particular to an anti-arc structure for a distribution box and a distribution box. Background Technology

[0002] Distribution boxes are electrical equipment characterized by their small size, easy installation, special technical performance, fixed location, unique configuration functions, no site restrictions, wide application, stable and reliable operation, high space utilization, small footprint, and environmental benefits.

[0003] The integrated distribution box contains a variety of electrical components with different functions. The terminals of each component are arranged in a distributed manner, and there is a potential risk of arc discharge between adjacent terminals. Therefore, arc-proof plates need to be inserted one by one at the gap between each group of adjacent terminals to achieve arc isolation and protection.

[0004] However, arc-proof plates need to be inserted one by one, which is quite troublesome to install. Moreover, relying solely on the simple insertion method and the gap between the terminals, the arc-proof plates are prone to displacement and loosening during long-term operation of the distribution box due to factors such as mechanical vibrations caused by equipment start-up and shutdown and thermal expansion and contraction of components caused by changes in ambient temperature. This results in insufficient stability and inadequate reliability in protecting against electric arcs. Summary of the Invention

[0005] Therefore, the purpose of this invention is to provide an arc-proof structure and distribution box for a distribution box, so as to solve the problems of insufficient installation stability of the arc-proof sheet and insufficient reliability of arc protection in the prior art.

[0006] This invention provides an arc-proof structure for a distribution box, comprising: A positioning frame, which is a U-shaped structure, is placed over the two terminals of the electrical components in the distribution box. Arc-blocking plates are fixed on the positioning frame and are spaced apart to limit multiple wire-passing grooves in the positioning frame. The wire-passing grooves are aligned one-to-one with each terminal of the electrical component. The arc-blocking plate has an air bladder near the top edge of the electrical component, and the air bladder is aligned with the first slot on the wiring terminal of the electrical component. The positioning frame is also provided with an inflation component for controlling the inflation of the airbag, so that after the arc-blocking piece is engaged with the first slot, the airbag is inflated and the arc-blocking piece is secured in the first slot by the airbag.

[0007] Optionally, a locking pin is provided on the top edge of the arc-blocking plate near the electrical component. The diameter of the locking pin is greater than the thickness of the top edge of the arc-blocking plate and the width of the first slot. The airbag is wrapped and fixed outside the locking pin.

[0008] Optionally, the inflation assembly includes: An air reservoir is disposed in the air reservoir mounting cavity within the positioning frame and communicates with the air reservoir. A sealing plate is fixedly installed in the air reservoir mounting cavity, and in the direction from the front to the back of the electrical component, the sealing plate is located on the side of the air reservoir close to the front of the electrical component. A push plate is movably disposed in the air reservoir mounting cavity and is disposed on the side of the air reservoir near the back of the electrical component; An elastic push rod mechanism is disposed on the back of the push plate and extends from the back of the positioning frame, pointing towards the bracket on the back of the electrical component. The bracket is fixed in the distribution box for the installation of the electrical component. The elastic push rod mechanism is used to drive the push plate to move in the air storage bag mounting cavity after the positioning frame is advanced to the target depth in the direction from the front to the back of the electrical device, thereby squeezing the air storage bag and squeezing the stored air in the air storage bag into the air bag.

[0009] Optionally, the inflation assembly further includes a blocking mechanism disposed on the back of the push plate, for blocking the push plate from moving in the air bladder mounting cavity before the positioning frame is advanced to the target depth in the direction from the front to the back of the electrical device.

[0010] Optionally, the blocking mechanism includes: A baffle is disposed on the outside of the front of the positioning frame and is connected to the push plate via a connecting plate; An elastic plate is disposed at both ends of the baffle and is parallel to the two side plates of the positioning frame. The elastic plate is disposed outside the side plate of the positioning frame and is in contact with the side plate of the positioning frame through a friction pad.

[0011] Optionally, a one-way movement limiting mechanism is provided between the sealing plate and the connecting plate to control the movement direction of the push plate by one-way movement limiting the connecting plate, so as to maintain the compressed state of the air storage bag.

[0012] Optionally, the elastic push rod mechanism includes a spring and a slide rod, the slide rod being connected to the push plate via the spring, and the slide rod extending from the back of the positioning frame.

[0013] Optionally, a movable plate is fixed to the lead-out end of the slide rod, and a magnet is provided between the movable plate and the positioning frame.

[0014] Optionally, the arc-blocking plate is further provided with an embedding groove for limiting the installation of the air guide tube between the air reservoir and the airbag.

[0015] Another aspect of the present invention provides a distribution box, including the above-described anti-arc structure for distribution boxes.

[0016] The arc-proof structure for distribution boxes provided by this invention uses a positioning frame to pre-fix multiple arc-blocking plates. Each arc-blocking plate has an air bladder near its top edge on the electrical component. The air bladder is aligned with a first slot on the wiring terminal of the electrical component, allowing for simultaneous installation of multiple arc-blocking plates with high efficiency. The positioning frame also includes an inflation component for controlling the inflation of the air bladder. After the arc-blocking plate engages with the first slot, the air bladder inflates, securing the arc-blocking plate within the slot. The flexible fastening of the air bladder buffers mechanical vibrations, reducing the risk of loosening. Furthermore, the continuous air pressure ensures reliable fastening even in low-temperature environments. This arc-proof structure for distribution boxes effectively reduces the impact of mechanical vibrations and environmental temperature changes on the installation stability of the arc-blocking plates, improving the reliability of the arc-proof structure. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the distribution box in an embodiment of the present invention; Figure 2 This is a schematic diagram of the electrical components installation in the distribution box according to an embodiment of the present invention; Figure 3 This is a schematic diagram showing the main results of the arc-proof structure of the distribution box in this embodiment of the invention; Figure 4 This is a partial cross-sectional schematic diagram of the arc-proof structure of the distribution box in an embodiment of the present invention; Figure 5 This is a schematic diagram of the air bladder installation structure of the arc-resistant structure of the distribution box in an embodiment of the present invention; Figure 6 This is a partial cross-sectional view of the air bladder of the arc-resistant structure of the distribution box in an embodiment of the present invention. Figure 7 This is a schematic diagram of the air duct portion of the arc-proof structure of the distribution box in an embodiment of the present invention.

[0018] The markings in the attached diagram are as follows: 1. Housing; 2. Bracket; 3. Electrical components; 4. Terminal block; 5. First slot; 6. Positioning frame; 7. Movable plate; 8. Slide rod; 9. Baffle; 10. Elastic plate; 11. Second slot; 12. Arc-blocking plate; 13. Slide groove; 14. Spring; 15. Airbag mounting groove; 16. Push plate; 17. Airbag; 18. Connecting plate; 19. Air duct; 20. Airbag; 21. Locking pin; 22. Magnet; 23. First torsion spring; 24. Flip groove; 25. Flip plate; 26. Second torsion spring; 27. Limiting groove; 28. First rubber pad; 29. ​​Protruding strip; 30. Embedded groove; 31. Threading groove; 32. Sealing plate.

[0019] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0020] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of the invention are illustrated in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0021] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] To address the issues of insufficient installation stability and inadequate arc protection reliability of existing arc-blocking plates, this invention provides an arc-blocking structure for distribution boxes. Multiple arc-blocking plates are pre-fixed within a positioning frame. Each arc-blocking plate has an air bladder positioned near the top edge of an electrical component. The air bladder aligns with a first slot on the terminal of the electrical component, allowing for simultaneous installation of multiple arc-blocking plates with high efficiency. The positioning frame also includes an inflation component for controlling the inflation of the air bladder. After the arc-blocking plate engages with the first slot, the air bladder inflates, securing the arc-blocking plate within the slot. The flexible fastening of the air bladder buffers mechanical vibrations, reducing the risk of loosening. Furthermore, the continuous air pressure ensures reliable fastening even in low-temperature environments, effectively improving the reliability of the arc-blocking structure and enhancing the safety of the distribution box.

[0024] Specifically, such as Figure 1 As shown, the distribution box uses box 1 as a protective shell, and a bracket 2 is installed inside. Electrical components 3 are fixed on the bracket 2. The electrical components 3 are, for example, circuit breakers.

[0025] To facilitate the installation and fixing of the multiple arc-blocking plates 12 in the arc-proof structure of the distribution box, please refer to the following for further details. Figure 2 and Figure 3The arc-blocking plate 12 is set on the positioning frame 6 and is spaced apart to separate multiple wire-passing grooves 31. The wire-passing grooves 31 correspond one-to-one with the wiring terminals 4 on the electrical components 3 so that the wires connected to the wiring terminals 4 can pass through the wire-passing grooves 31.

[0026] The arc-blocking plate 12 is fixed with a locking pin 21 near the top of the electrical component 3. An airbag 20 is fixedly wrapped around the locking pin 21. The upper and lower ends (connection terminals; in this embodiment, the electrical component 3 is placed vertically, corresponding to the upper and lower ends; when the electrical component 3 is placed horizontally, corresponding to the left and right ends) of the electrical component 3 are provided with first slots 5 so that the locking pin 21 and the airbag 20 can be embedded in the first slots 5, thereby realizing the positioning of the top of the arc-blocking plate 12. Combined with the positioning frame 6 to fix the electrical component 3, multiple arc-blocking plates 12 can be simultaneously and securely installed on the electrical component 3.

[0027] The positioning frame 6 is a U-shaped frame with second slots 11 at both ends, which match the four corner limits of the electrical component 3. When installing the positioning frame 6, aligning the second slots 11 of the positioning frame 6 with the four corners of the electrical component 3 allows for simultaneous alignment of multiple arc-blocking plates 12 with multiple first slots 5, eliminating the need for separate alignment operations and improving operational convenience. After alignment, the entire arc-blocking structure of the distribution box is pushed towards the electrical component 3, thereby causing all the arc-blocking plates 12 to be simultaneously inserted into the first slots 5.

[0028] After the locking pin 21 of the arc-blocking plate 12 and the airbag 20 are inserted into the first slot 5, the airbag 20 is inflated by the inflation assembly, which can stably fix the arc-blocking plate 12 on the electrical component 3.

[0029] To achieve inflation control of the airbag 20, please refer to the following in this embodiment: Figure 3 , Figure 4 , Figure 5 The inflation assembly includes an air bladder mounting groove 15 on the positioning frame 6, in which an air bladder 17 is installed (it can be installed on the side plate or bottom plate of the U-shaped structure of the positioning frame 6, depending on the available space). The air bladder 17 is connected to each air bladder 20 through an air guide pipe 19. One side of the air bladder 17 is limited and fixed to the positioning frame 6 by a sealing plate 32, and the other side is provided with a push plate 16. The push plate 16 is connected to an elastic push rod mechanism, which includes a spring 14 and a slide rod 8. The spring 14 and the slide rod 8 are set in the slide groove 13 of the side plate of the positioning frame 6 and are led out from the inside of the positioning frame 6. A baffle 9 is also provided on the outside of the front of the positioning frame 6. The push plate 16 is hinged to a connecting plate 18 so that the other end of the connecting plate 18 points to the baffle 9 and is connected to the baffle 9.

[0030] When the anti-arc structure of the distribution box is pushed from the front to the back of the electrical component 3, the baffle 9 first abuts against the front of the positioning frame 6, limiting the connecting plate 18, and the air bladder 17 is inflated. As the anti-arc structure of the distribution box is pushed towards the back of the electrical component 3, the slide rod 8 abuts against the bracket 2, causing the spring 14 to be compressed. The locking pin 21 and the air bladder 20 are inserted into the first slot 5. After reaching the bottom, the slide rod 8 stops and is maintained in the state of being pushed into the slide groove 13 of the positioning frame 6. At this time, the baffle 9 is released from limiting the connecting plate 18. Under the action of the spring 14, the push plate 16 is pushed outward relative to the positioning frame 6, squeezing the air bladder 17 and compressing the gas in the air bladder 17 into the air bladder 20. The air bladder 20 expands, which can fasten the locking pin 21 and the air bladder 20 in the first slot 5, thus fixing the anti-arc structure of the distribution box to the electrical component 3.

[0031] When the minimum diameter of the locking pin 21 and the airbag 20 is greater than the minimum width of the opening of the first slot 5, the arc-resistant structure of the distribution box can be installed by pushing it in along the extension direction of the first slot 5. When the diameter of the locking pin 21 is greater than the minimum width of the opening of the first slot 5, the stability of the engagement can be improved and the risk of detachment can be reduced. When the minimum diameter of the locking pin 21 and the airbag 20 is less than the width of the opening of the first slot 5, the arc-resistant structure of the distribution box can be installed by directly inserting it into the first slot 5 from the opening direction, but the fixing strength will be lower. The specific installation method can be selected according to actual needs.

[0032] To facilitate the fixing and unlocking of the baffle 9 relative to the positioning frame 6, in this embodiment, elastic plates 10 are provided at both ends of the baffle 9. The elastic plates 10 are located on the outer side of the side plate of the positioning frame 6, and a first rubber pad 28 and a raised strip 29 are respectively provided on the mating surface of the elastic plate 10 and the positioning frame 6 to provide friction. A horizontal guide and limiting structure can also be provided between the elastic plate 10 and the positioning frame 6 to allow for assembly into a single structure. Specifically, it can be selected to be separate or connected according to actual needs. When separated, the baffle 9 and the elastic plate 10 can be reused. When connected as a whole, the problem of small parts being easily lost can be avoided.

[0033] During installation, the elastic plates 10 on both sides of the external clamping baffle 9 are pressed together, and the first rubber pad 28 and the raised strip 29 provide friction to fix the positioning frame 6 and the baffle 9. After the entire anti-arc structure of the distribution box is pushed to the end in the direction close to the electrical component 3, the clamping of the elastic plate 10 is released, the first rubber pad 28 and the raised strip 29 are released, and the baffle 9 is released from its abutment limit relative to the positioning frame 6. The first rubber pad 28 and the raised strip 29 are used to provide friction, and friction pads made of other materials can also be selected.

[0034] To ensure the reliability of maintaining the inflated state of the airbag 20, in this embodiment, a movable plate 7 is also provided on the back of the positioning frame 6. The slide rod 8 is fixedly connected to the movable plate 7. On the mating surface of the movable plate 7 and the side plate of the positioning frame 6, there is also an attractive magnet 22. After the anti-arc structure of the distribution box is pushed all the way to the end in the direction closer to the electrical component 3, the magnet 22 magnetically attracts and fixes the movable plate 7 and the side plate of the positioning frame 6, thereby maintaining the outward pushing force of the slide rod 8 on the push plate 16 through the spring 14, maintaining the compressed state of the airbag 17, thereby ensuring the inflated state of the airbag 20 and preventing the positioning frame 6 from being popped open again (the arc-blocking plate can also be manually pressed to prevent it from popping open, and then released after the airbag 20 is inflated, which can also maintain the fixed state), ensuring the fixed reliability of the protective structure.

[0035] To further improve the reliability of maintaining the inflated state of the airbag 20, a one-way movement limiting mechanism is provided between the sealing plate 32 and the connecting plate 18. This mechanism controls the movement direction of the push plate 16 by limiting the movement of the connecting plate 18 in one direction, thereby maintaining the compressed state of the airbag 17.

[0036] For details, please refer to further information. Figure 5 and Figure 6 The sealing plate 32 is fixed on the positioning frame 6. The one-way movable limiting mechanism includes a flip groove 24 set on the top of the sealing plate 32. A flip plate 25 is hinged in the flip groove 24. The side wall of the flip groove 24 is used to limit the rotation posture of the flip plate 25. The flip plate 25 is also connected to a second torsion spring 26, which is used to drive the flip plate 25 to rotate in the direction of the flip groove 24. The bottom of the connecting plate 18 is provided with multiple limiting grooves 27. When the pushing plate 16 pushes the connecting plate 18 to move outward, the limiting grooves 27 can press down the flip plate 25. As the flip plate 25 resets under the action of the second torsion spring 26, the flip plate 25 enters the downward limiting groove 27 and restricts the retraction of the connecting plate 18 through the limiting groove 27, thereby realizing the one-way compression of the air storage bag 17 by the pushing plate 16 and improving the reliability of maintaining the inflation state of the air bag 20.

[0037] A first torsion spring 23 is also provided at the end where the connecting plate 18 is connected to the push plate 16. This spring is used to maintain the downward preload of the connecting plate 18 and prevent the connecting plate 18 from being lifted, which would damage the limiting state of the limiting groove 27 and the flipping groove 24. When disassembly is required, lifting the connecting plate 18 can release the limiting of the movable limiting mechanism.

[0038] When the baffle 9 and the connecting plate 18 are hinged, the state of the baffle 9 will affect the reliability of the connecting plate 18 pressing against the top of the sealing plate 32. Correspondingly, a movement direction limit can be set between the baffle 9 and the positioning frame 6 so that the movement direction of the baffle 9 is consistent with the extension direction of the connecting plate 18. Moreover, by limiting the movement direction of the baffle 9, the requirement for setting the first torsion spring 23 can be reduced.

[0039] To facilitate the installation of the gas duct 19, in this embodiment, as follows: Figure 7 As shown, an embedding groove 30 is provided on one side of the arc-blocking plate 12, and the branch pipe of the air guide pipe 19 is embedded in the embedding groove 30, and is connected to the airbag 20 on each arc-blocking plate 12 through the branch pipe. Among them, the locking pin 21 is an inflatable structure, which facilitates the locking and fixing of the airbag 20 with the locking pin 21.

[0040] In an optional embodiment, the air supply control structure of airbag 20 and air reservoir 17 can be implemented through an independent locking device. For example, when the anti-arc structure of the distribution box is installed directly from top to bottom, a gear and rack structure is set on the positioning frame 6. The rack is fixedly connected to the push plate 16, and the gear is connected to a knob. The knob is led out from the side plate of the positioning frame 6. A limit hook is also set on the side plate of the positioning frame 6. A limit rod that can be raised and lowered is set on the knob (the limit rod can also be set on the side of the positioning frame, and a slot is set on the corresponding knob for engaging with the limit rod to lock the knob). By rotating the knob, the gear and rack structure is driven, which drives the push plate 16 to compress the air reservoir 17. After reaching the position, the limit rod of the knob is lowered, and the limit hook on the side plate of the positioning frame 6 limits the compression state of the air reservoir 17. The reverse operation can release the inflation state of the airbag 20, which is convenient for disassembly and maintenance.

[0041] The arc-proof structure of the distribution box of the present invention utilizes airbags to achieve flexible locking, which can buffer mechanical vibration, reduce the interference of mechanical vibration on the fixed reliability, improve the arc-proof reliability, and thus improve the reliability of the distribution box.

[0042] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0043] The embodiments described above are merely illustrative of several specific implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of protection of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. An anti-arc structure for a distribution box, characterized in that, include: A positioning frame, which is a U-shaped structure, is placed over the two terminals of the electrical components in the distribution box. Arc-blocking plates are fixed on the positioning frame and are spaced apart to limit multiple wire-passing grooves in the positioning frame. The wire-passing grooves are aligned one-to-one with each terminal of the electrical component. The arc-blocking plate has an air bladder near the top edge of the electrical component, and the air bladder is aligned with the first slot on the wiring terminal of the electrical component. The positioning frame is also provided with an inflation component for controlling the inflation of the airbag, so that after the arc-blocking piece is engaged with the first slot, the airbag is inflated and the arc-blocking piece is secured in the first slot by the airbag.

2. The arc-proof structure of the distribution box according to claim 1, characterized in that, A locking pin is also provided on the top edge of the arc-blocking plate near the electrical component. The diameter of the locking pin is greater than the thickness of the top edge of the arc-blocking plate and the width of the first slot. The airbag is wrapped and fixed outside the locking pin.

3. The arc-proof structure of the distribution box according to claim 2, characterized in that, The inflation assembly includes: An air reservoir is disposed in the air reservoir mounting cavity within the positioning frame and communicates with the air reservoir. A sealing plate is fixedly installed in the air reservoir mounting cavity, and in the direction from the front to the back of the electrical component, the sealing plate is located on the side of the air reservoir close to the front of the electrical component. A push plate is movably disposed in the air reservoir mounting cavity and is disposed on the side of the air reservoir near the back of the electrical component; An elastic push rod mechanism is disposed on the back of the push plate and extends from the back of the positioning frame, pointing towards the bracket on the back of the electrical component. The bracket is fixed in the distribution box for the installation of the electrical component. The elastic push rod mechanism is used to drive the push plate to move in the air storage bag mounting cavity after the positioning frame is advanced to the target depth in the direction from the front to the back of the electrical device, thereby squeezing the air storage bag and squeezing the stored air in the air storage bag into the air bag.

4. The arc-proof structure of the distribution box according to claim 3, characterized in that, The inflation assembly further includes a blocking mechanism disposed on the back of the push plate, used to block the push plate from moving in the air bladder mounting cavity before the positioning frame is advanced to the target depth in the direction from the front to the back of the electrical component.

5. The arc-proof structure of the distribution box according to claim 4, characterized in that, The blocking mechanism includes: A baffle is disposed on the outside of the front of the positioning frame and is connected to the push plate via a connecting plate; An elastic plate is disposed at both ends of the baffle and is parallel to the two side plates of the positioning frame. The elastic plate is disposed outside the side plate of the positioning frame and is in contact with the side plate of the positioning frame through a friction pad.

6. The arc-proof structure of the distribution box according to claim 5, characterized in that, A one-way movement limiting mechanism is provided between the sealing plate and the connecting plate to control the movement direction of the push plate by limiting the movement of the connecting plate in one direction, so as to maintain the compression state of the air storage bag.

7. The arc-proof structure of the distribution box according to claim 3, characterized in that, The elastic push rod mechanism includes a spring and a slide rod. The slide rod is connected to the push plate via the spring and extends from the back of the positioning frame.

8. The arc-proof structure of the distribution box according to claim 7, characterized in that, The slide bar is also fixed with a movable plate at its lead-out end, and a magnet is provided between the movable plate and the positioning frame.

9. The arc-proof structure of the distribution box according to claim 3, characterized in that, The arc-blocking plate is also provided with an embedding groove for limiting the installation of the air guide tube between the air storage bag and the air bag.

10. A distribution box, characterized in that, The distribution box arc-proof structure includes any one of claims 1 to 9.

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