Photovoltaic energy storage devices

Abstract

This invention discloses a photovoltaic energy storage device, which relates to the field of photovoltaic energy storage technology. Due to the upward surge of hot air inside the device, newly entering air is directly driven upwards and cannot penetrate deep into the device, resulting in ineffective cooling of the energy storage unit at the center. This photovoltaic energy storage device, through an internal guide plate in conjunction with an air intake mechanism, allows air to pass through the air intake mechanism. The inclined installation of the internal guide plate causes the incoming air to move obliquely downwards, entering the space between the partition plates. This prevents the upward surge of hot air from directly driving newly entering air upwards and preventing it from penetrating deep into the device, thus avoiding the ineffective cooling of the energy storage unit at the center.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic energy storage technology, specifically to photovoltaic energy storage devices. Background Technology

[0002] Photovoltaics, or photovoltaic (PV) power generation systems, are power generation systems that utilize the photovoltaic effect of semiconductor materials to convert solar radiation energy into electrical energy. PV power generation systems are divided into stand-alone PV systems and grid-connected PV systems. A PV power generation system consists of equipment such as solar cell arrays, battery banks, charge / discharge controllers, inverters, AC distribution cabinets, and solar tracking control systems. PV energy storage devices store the electrical energy generated by the solar photovoltaic system. Common PV energy storage devices are battery banks, which store the generated electrical energy through multiple energy storage units. When needed, the energy is transmitted to external electrical devices via an inverter.

[0003] In existing energy storage devices, there are usually multiple energy storage units inside, with gaps between them. When dissipating heat, the heat in the gaps is transferred outward with the air. However, due to the upward surge of the hot air inside, the air that just enters is directly carried upward out of the device and cannot penetrate deep into the device, resulting in the energy storage unit in the center not being able to be effectively cooled. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] Photovoltaic energy storage devices, including:

[0006] The housing has air inlet slots on both sides and a heat dissipation slot at the center of the top of the housing.

[0007] An air intake mechanism is installed at the air intake slot of the housing and is used to filter the incoming air.

[0008] A heat dissipation mechanism is mounted on the top of the housing;

[0009] A support frame is fixedly installed inside the housing, and a partition plate is fixedly installed inside the support frame. The partition plates are evenly installed from top to bottom inside the support frame, and symmetrical oblique slots are formed on the top of the partition plates. Through the cooperation of the oblique slots and baffles, air is intermittently blocked by the baffles as it flows between the partition plates. Utilizing the gap between the baffles and the top of the energy storage unit, some of the air blocked by the baffles passes through the gap. Simultaneously, the airflow path at the gap is small, increasing the airflow velocity and improving the amount of air in contact with the surface of the energy storage unit, thus enhancing the cooling effect. At the same time, the oblique slots allow the bottom of the energy storage unit to also contact the air, ensuring a secure fit while preventing the bottom of the energy storage unit from overheating. Energy storage units are installed on the top of each partition plate. A baffle plate is fixedly installed on the bottom of each partition plate. The baffle plate corresponds to the inclined slot, and the bottom of the baffle plate does not contact the top of the energy storage unit. An inner guide plate is fixedly installed at the air inlet slot of each shell. With the cooperation of the inner guide plate and the air inlet mechanism, after the air passes through the air inlet mechanism, the inclined installation of the inner guide plate causes the incoming air to move obliquely downward and enter the space between the partition plates. This avoids the upward surge of the internal hot air during the heat dissipation and cooling process, which would cause the incoming air to be directly driven upward and rush out of the device, unable to penetrate into the device, thus preventing the energy storage unit in the center from being effectively cooled. The inner guide plates are evenly installed from top to bottom at the air inlet slot, and the inner guide plates are inclined downward from the inside to the outside.

[0010] Preferably, the air intake mechanism includes a fixed frame, which is fixedly installed on the outside of the housing and corresponds one-to-one with the air intake slot. A grid plate is fixedly installed on the inner wall of the fixed frame, and grid slots are evenly opened on the outer side of the grid plate. A sponge pad is fixedly installed on the side of the grid plate near the inner guide plate. The side of the sponge pad away from the grid plate is tightly fitted with the outer side of the inner guide plate, and the outer side of the sponge pad is tightly fitted with the inner wall of the fixed frame. Through the porous structure of the sponge pad ring, moisture and dust in the air are blocked during the air passage, preventing moisture and dust from contacting the energy storage unit and causing short circuits in the energy storage device, which could lead to fires. At the same time, when impacted, it works with the side pads to assist in impact buffering while the inner guide plate restricts the inward movement of the sponge pad, improving the safety and anti-collision effect. A louver is fixedly installed on the inner wall of the fixed frame. The end of the louver away from the fixed frame is inclined downward, and the louvers are evenly installed from top to bottom inside the fixed frame, with gaps between the louvers.

[0011] Preferably, side pads are fixedly installed between the louvers. The side pads are symmetrically installed along the center of the louver axis and are made of rubber. A bottom baffle is fixedly installed on the inner wall of the fixing frame. The bottom baffle is located on the side of the grid plate away from the sponge pad and there is a gap between the bottom baffle and the grid plate. The bottom of the outer side of the bottom baffle is evenly provided with notches. Through the cooperation between the bottom baffle and the grid plate, when in use, after the sponge pad absorbs a lot of water, the overflowing water droplets can be discharged outward from the notches. At the same time, by utilizing the gap between the grid plate and the bottom baffle, when impacted, there is a certain gap between the cushioning of the sponge pad and the cushioning of the side pads. The gap allows the louvers to deform and be damaged to a certain extent when they collide with the bottom baffle, consuming a certain amount of impact force and improving the safety protection effect. The bottom baffle is located below the louvers.

[0012] Preferably, the heat dissipation mechanism includes a top slot plate, which is fixedly installed on the top of the housing. The top of the top slot plate has uniformly spaced through slots, which correspond to the heat dissipation slots of the housing. The edges of the top of the top slot plate are all inclined surfaces sloping downwards from the inside out. An outer cover frame is fixedly installed on the top of the top slot plate. The bottom of the outer cover frame has uniformly spaced toothed grooves. The toothed grooves of the outer cover frame cooperate with the notches of the inner cover frame, making the airflow path more tortuous. Simultaneously, the space between the outer cover frame and the inner cover frame blocks dust from entering the interior, improving the dustproof and anti-clogging effect of the heat dissipation path. A top cover plate is fixedly installed on the top of the outer cover frame, and an inner cover frame is fixedly installed on the top of the top slot plate. The top of the inner cover frame has uniformly spaced notches.

[0013] Preferably, the inner cover frame is located inside the outer cover frame, and the top of the inner cover frame does not contact the top cover plate. The through groove of the top groove plate is located inside the inner cover frame. A fixing strip is fixedly installed at the bottom of the top groove plate. The fixing strip is located at the center of the bottom of the top groove plate. Inclined guide plates are fixedly installed on both sides of the fixing strip. The end of the inclined guide plate away from the fixing strip is inclined downward. There is a gap between the inclined guide plate and the top groove plate, and the gap gradually increases as it moves away from the fixing strip.

[0014] This invention provides a photovoltaic energy storage device. It has the following beneficial effects:

[0015] 1. This photovoltaic energy storage device, through the inner guide plate and the air intake mechanism, allows the air to move obliquely downwards after passing through the air intake mechanism, and enter the space between the partition plates. This avoids the upward surge of the internal hot air during the heat dissipation and cooling process, which would cause the newly entered air to be directly driven upwards and rush out of the device, unable to penetrate deep into the device, thus preventing the energy storage unit in the center from being effectively cooled.

[0016] Second, this photovoltaic energy storage device uses a combination of inclined slots in the partition plates and wind baffles to allow air to flow between the partition plates. The air is intermittently blocked by the wind baffles, and the gap between the wind baffles and the top of the energy storage unit allows some of the air blocked by the wind baffles to pass through the gap. At the same time, the air flow path at the gap is small, which increases the air velocity and increases the amount of air in contact with the surface of the energy storage unit, thereby improving the cooling effect on the energy storage unit. Meanwhile, the inclined slots also allow the bottom of the energy storage unit to contact the air, ensuring the fixation effect while preventing the bottom of the energy storage unit from getting too hot.

[0017] Third, this photovoltaic energy storage device, through the porous structure of the sponge pad ring, blocks moisture and dust in the air during the air passage process, preventing moisture and dust from contacting the energy storage unit and causing short circuits and fires. At the same time, when subjected to impact, it works with the side pads to assist in impact buffering while the inner guide plate restricts the inward movement of the sponge pad, thereby improving the safety and anti-collision effect.

[0018] IV. This photovoltaic energy storage device, through the cooperation of the bottom baffle and the grid plate, allows the sponge pad to absorb a large amount of water during use, and the overflowing water droplets can be discharged outward from the notch. At the same time, by utilizing the gap between the grid plate and the bottom baffle, a certain gap exists between the cushioning of the sponge pad and the cushioning of the side pads when impacted. The gap is used to reduce the deformation and damage of the louvered plate when it collides with the bottom baffle, thus absorbing a certain impact force and improving the safety protection effect.

[0019] Fifth, this photovoltaic energy storage device, through the matching of the toothed grooves of the outer frame and the notched grooves of the inner frame, makes the airflow path more tortuous. At the same time, the space between the outer frame and the inner frame blocks dust from entering the interior from the outside, improving the dustproof and anti-clogging effect of the heat dissipation path. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the photovoltaic energy storage device of the present invention;

[0021] Figure 2 This is a schematic diagram of the photovoltaic energy storage device of the present invention;

[0022] Figure 3 This is a schematic diagram of the photovoltaic energy storage device of the present invention;

[0023] Figure 4 This is a schematic diagram of the photovoltaic energy storage device of the present invention;

[0024] Figure 5 This is a schematic diagram of the air intake mechanism of the present invention;

[0025] Figure 6 This is a sectional view of the air intake mechanism of the present invention;

[0026] Figure 7 This is a schematic diagram of the heat dissipation mechanism of the present invention;

[0027] Figure 8 This is a cross-sectional view of the heat dissipation mechanism of the present invention.

[0028] In the diagram: 1. Shell; 2. Air intake mechanism; 3. Heat dissipation mechanism; 4. Support frame; 5. Inner guide plate; 6. Energy storage unit; 7. Dividing plate; 8. Wind baffle; 21. Fixing frame; 22. Louvered plate; 23. Bottom baffle; 24. Sponge pad; 25. Grille plate; 26. Side pad; 31. Top groove plate; 32. Outer cover frame; 33. Top cover plate; 34. Inner cover frame; 35. Fixing strip; 36. Inclined guide plate. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] First embodiment, such as Figures 1 to 4 As shown, the present invention provides a technical solution:

[0031] Photovoltaic energy storage devices, including:

[0032] The housing 1 has air inlet slots on both sides and a heat dissipation slot at the center of the top of the housing 1.

[0033] Air intake mechanism 2 is installed at the air intake slot of housing 1 and is used to filter the incoming air;

[0034] Heat dissipation mechanism 3 is installed on the top of housing 1;

[0035] A support frame 4 is fixedly installed inside the housing 1, and a partition plate 7 is fixedly installed inside the support frame 4. The partition plates 7 are evenly installed from top to bottom inside the support frame 4, and oblique slots are symmetrically opened on the top of the partition plates 7. After the outside air passes through the air inlet mechanism 2, the low-temperature outside air begins to pass through the air inlet slots of the housing 1. During the process of passing through the air inlet slots, the outside air is guided by the inclination of the inner guide plate 5, so that the flowing air flows obliquely downward under the guidance of the inner guide plate 5 and enters the space between the partition plates 7 inside the support frame 4. This allows the air introduced from both sides to enter the space between the partition plates 7. Each unit is equipped with an energy storage unit 6. A baffle plate 8 is fixedly installed at the bottom of the partition plate 7. The baffle plate 8 corresponds to the inclined channel one by one, and the bottom of the baffle plate 8 does not contact the top of the energy storage unit 6. During the airflow between the partition plates 7, the air directly contacts the surface of the energy storage unit 6 and absorbs the heat of the energy storage unit 6. During the airflow, the baffle plate 8 blocks the airflow in the inclined channel and flows downward towards the energy storage unit. An inner guide plate 5 is fixedly installed at the air inlet slot of the housing 1. The inner guide plates 5 are evenly installed from top to bottom at the air inlet slot and are inclined downward from the inside to the outside.

[0036] The second embodiment is based on the first embodiment; please refer to [link / reference]. Figures 5 to 6 As shown, the air intake mechanism 2 includes a fixed frame 21, which is fixedly installed on the outside of the housing 1, and the fixed frame 21 corresponds one-to-one with the air intake slot. A grille plate 25 is fixedly installed on the inner wall of the fixed frame 21. Grille slots are evenly opened on the outer side of the grille plate 25. A sponge pad 24 is fixedly installed on the side of the grille plate 25 near the inner guide plate 5. The side of the sponge pad 24 away from the grille plate 25 is tightly fitted to the outer side of the inner guide plate 5. In the air intake mechanism 2, the gaps between the louvers 22 provide a flow path for the air to enter. At the same time, when the inclined louvers 22 are installed outdoors, they guide the dripping rainwater, causing the rainwater to flow along the inclined... Facing both sides, the air passes through the gaps between the louvers 22 and then contacts the grille plate 25. The grille plate 25 cooperates with the sponge pad 24 to allow the air to pass through the grille groove and the sponge pad 24 into the housing 1. At the same time, it blocks moisture and dust in the air, preventing water vapor and dust from entering the interior and causing short circuits. The outer side of the sponge pad 24 is tightly attached to the inner wall of the fixed frame 21. The louvers 22 are fixedly installed on the inner wall of the fixed frame 21. The end of the louvers 22 away from the fixed frame 21 is inclined downwards. The louvers 22 are evenly installed from top to bottom inside the fixed frame 21, and there are gaps between the louvers 22.

[0037] Side pads 26 are fixedly installed between the louvers 22. The side pads 26 are symmetrically installed along the center of the axis of the louvers 22 and are made of rubber. A bottom baffle 23 is fixedly installed on the inner wall of the fixed frame 21. The bottom baffle 23 is located on the side of the grid plate 25 away from the sponge pad 24. When the energy storage device is impacted, the impact force is first buffered by the side pads 26 between the louvers 22. The elastic deformation characteristics of the rubber material of the side pads 26 are used to initially buffer the impact. When the impact force is too large and the louvers 22 are deformed and damaged, they begin to contact the grid plate 25. The sponge pad 24 between the grid plate 25 and the inner guide plate 5 is used to further buffer the impact by restricting the sponge pad 24 with the inner guide plate 5. This achieves double-interval buffering of the impact. There is a gap between the bottom baffle 23 and the grid plate 25. The bottom of the outer side of the bottom baffle 23 is evenly provided with notches, and the bottom baffle 23 is located below the louvers 22.

[0038] The third embodiment is based on embodiments one and two; please refer to [link / reference]. Figures 7 to 8 As shown, the heat dissipation mechanism 3 includes a top slot plate 31, which is fixedly installed on the top of the housing 1. The top of the top slot plate 31 is uniformly provided with through slots, which correspond to the heat dissipation slots of the housing 1. The edges of the top of the top slot plate 31 are all inclined surfaces that slope downwards from the inside out. An outer cover frame 32 is fixedly installed on the top of the top slot plate 31. The bottom of the outer cover frame 32 is uniformly provided with toothed grooves. The high-temperature air inside the housing 1 surges upwards and contacts the bottom of the inclined guide plate 36. Through the inclination of the inclined guide plate 36, the high-temperature air moves to both sides and enters the space between the inclined guide plate 36 and the top slot plate 31 from the edge of the inclined guide plate 36. A top cover plate 33 is fixedly installed on the top of the outer cover frame 32, and an inner cover frame 34 is fixedly installed on the top of the top slot plate 31. The top of the inner cover frame 34 is uniformly provided with notches.

[0039] The inner frame 34 is located inside the outer frame 32, and the top of the inner frame 34 does not contact the top cover plate 33. The through slot of the top groove plate 31 is located inside the inner frame 34. A fixing strip 35 is fixedly installed at the bottom of the top groove plate 31. The fixing strip 35 is located at the center of the bottom of the top groove plate 31, and inclined guide plates 36 are fixedly installed on both sides of the fixing strip 35. Then, high-temperature air passes through the through slot of the top groove plate 31 and enters the inner side of the inner frame 34. Under the restriction of the top cover plate 33, it enters the gap between the inner frame 34 and the outer frame 32 from the top of the inner frame 34. Finally, it is discharged from the energy storage device through the toothed groove at the bottom of the outer frame 32 for heat dissipation. The end of the inclined guide plate 36 away from the fixing strip 35 is inclined downward, and there is a gap between the inclined guide plate 36 and the top groove plate 31. The gap gradually increases as it moves away from the fixing strip 35.

[0040] In use, the energy storage device is connected to the photovoltaic system via a cable, so that the electrical energy generated by the photovoltaic system is introduced into the energy storage device through the inverter. Multiple energy storage units 6 store the electrical energy generated by the photovoltaic system. At the same time, during use, the energy storage units 6 generate heat as they continuously absorb electrical energy, which raises the temperature inside the shell 1. At this time, the hot air surges upward inside the shell and is discharged from the shell by the heat dissipation mechanism 3. Meanwhile, as the gas escapes, the external gas decreases in internal pressure and enters the interior of the shell 1 through the air intake mechanisms 2 on both sides to cool the interior.

[0041] After the outside air passes through the air intake mechanism 2, the low-temperature outside air begins to pass through the air intake slot of the housing 1. During the process of passing through the air intake slot, the outside air is guided by the inclination of the inner guide plate 5, causing the air to flow obliquely downward under the guidance of the inner guide plate 5 and enter the space between the partition plates 7 inside the support frame 4. The air introduced from both sides enters the space between the partition plates 7. At the same time, during the flow of the air between the partition plates 7, it directly contacts the surface of the energy storage unit 6 and absorbs the heat of the energy storage unit 6. During the flow, through the cooperation of the partition plates 7 and the baffle plate 8, the air flowing at the oblique passage is blocked by the baffle plate 8 and flows downward toward the energy storage unit.

[0042] In the air intake mechanism 2, the gaps between the louvers 22 provide a flow path for air to enter. At the same time, when the inclined louvers 22 are installed outdoors, they guide the dripping rainwater, causing the rainwater to flow to both sides along the inclined surface. After passing through the gaps between the louvers 22, the air contacts the grille plate 25. Through the grille groove of the grille plate 25 and the sponge pad 24, the air can pass through the grille groove and the sponge pad 24 to enter the interior of the housing 1. At the same time, it blocks moisture and dust in the air, preventing water vapor and dust from entering the interior and causing short circuits. At the same time, when the energy storage device is impacted, the side pads 26 between the louvers 22 first buffer the impact force. The elastic deformation characteristics of the rubber material of the side pads 26 provide initial buffering during the impact. When the impact force is too large and the louvers 22 are deformed and damaged, they begin to contact the grille plate 25. The sponge pad 24 between the grille plate 25 and the inner guide plate 5 provides a second buffering treatment by restricting the sponge pad 24 with the inner guide plate 5, thus achieving double-interval buffering of impact.

[0043] In the heat dissipation mechanism 3, the high-temperature air inside the housing 1 surges upward and contacts the bottom of the inclined guide plate 36. Due to the inclination of the inclined guide plate 36, the high-temperature air moves to both sides and enters the space between the inclined guide plate 36 and the top slot plate 31 from the edge of the inclined guide plate 36. Then, the high-temperature air passes through the through slot of the top slot plate 31 and enters the inner side of the inner cover frame 34. Under the restriction of the top cover plate 33, it enters the gap between the inner cover frame 34 and the outer cover frame 32 from the top of the inner cover frame 34. Finally, it is discharged from the energy storage device through the toothed groove at the bottom of the outer cover frame 32 for heat dissipation.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0045] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A photovoltaic energy storage device, characterized in that, include: The housing (1) has air inlet slots on both sides and a heat dissipation slot at the center of the top of the housing (1). An air intake mechanism (2) is installed at the air intake slot of the housing (1) and is used to filter the incoming air. A heat dissipation mechanism (3) is installed on the top of the housing (1); A support frame (4) is fixedly installed inside the housing (1), and a partition plate (7) is fixedly installed inside the support frame (4). The partition plate (7) is evenly installed from top to bottom inside the support frame (4), and the top of the partition plate (7) is symmetrically provided with oblique slots. An energy storage unit (6) is installed on the top of each partition plate (7). A wind baffle (8) is fixedly installed at the bottom of the partition plate (7). The wind baffle (8) corresponds to the oblique slots one by one, and the bottom of the wind baffle (8) does not contact the top of the energy storage unit (6). An inner guide plate (5) is fixedly installed at the air inlet slot of the housing (1). The inner guide plate (5) is evenly installed from top to bottom at the air inlet slot, and the inner guide plate (5) is inclined downward from the inside to the outside. The air intake mechanism (2) includes a fixed frame (21), which is fixedly installed on the outside of the housing (1), and the fixed frame (21) corresponds to the air intake slot. A grille plate (25) is fixedly installed on the inner wall of the fixed frame (21), and grille slots are evenly opened on the outer side of the grille plate (25). A sponge pad (24) is fixedly installed on the side of the grid plate (25) near the inner guide plate (5). The side of the sponge pad (24) away from the grid plate (25) is closely attached to the outer side of the inner guide plate (5), and the outer side of the sponge pad (24) is closely attached to the inner wall of the fixed frame (21). The inner wall of the fixed frame (21) is fixedly installed with louvers (22). The end of the louvers (22) away from the fixed frame (21) is inclined downward. The louvers (22) are evenly installed from top to bottom inside the fixed frame (21). There are gaps between the louvers (22). Side pads (26) are fixedly installed between the louvers (22). The side pads (26) are symmetrically installed along the center of the axis of the louvers (22). The side pads (26) are made of rubber. A bottom baffle (23) is fixedly installed on the inner wall of the fixed frame (21). The bottom baffle (23) is located on the side of the grid plate (25) away from the sponge pad (24), and there is a gap between the bottom baffle (23) and the grid plate (25). The bottom of the outer side of the bottom baffle (23) is uniformly provided with notches, and the bottom baffle (23) is located below the louvered plate (22).

2. The photovoltaic energy storage device according to claim 1, characterized in that: The heat dissipation mechanism (3) includes a top groove plate (31), which is fixedly installed on the top of the housing (1). The top of the top groove plate (31) is evenly provided with through grooves, and the through grooves of the top groove plate (31) correspond to the heat dissipation grooves of the housing (1). The edge of the top of the top groove plate (31) is a sloping surface that slopes downward from the inside to the outside.

3. The photovoltaic energy storage device according to claim 2, characterized in that: The top of the top groove plate (31) is fixedly installed with an outer cover frame (32), the bottom of the outer cover frame (32) is evenly provided with toothed grooves, the top of the outer cover frame (32) is fixedly installed with a top cover plate (33), the top of the top groove plate (31) is fixedly installed with an inner cover frame (34), and the top of the inner cover frame (34) is evenly provided with notches.

4. The photovoltaic energy storage device according to claim 3, characterized in that: The inner frame (34) is located inside the outer frame (32), and the top of the inner frame (34) does not contact the top cover plate (33). The through groove of the top groove plate (31) is located inside the inner frame (34).

5. The photovoltaic energy storage device according to claim 4, characterized in that: A fixing strip (35) is fixedly installed at the bottom of the top groove plate (31). The fixing strip (35) is located at the center of the bottom of the top groove plate (31). An inclined guide plate (36) is fixedly installed on both sides of the fixing strip (35). The end of the inclined guide plate (36) away from the fixing strip (35) is inclined downward. There is a gap between the inclined guide plate (36) and the top groove plate (31). The gap gradually increases as it moves away from the fixing strip (35).

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