A kind of energy storage device of photovoltaic direct-flexible microgrid

Abstract

The present invention discloses an energy storage device for a photovoltaic direct-flexible microgrid, belonging to the technical field of photovoltaic energy storage; the energy storage device comprises a placement box, a cooling mechanism, a driving mechanism and a clamping mechanism; a plurality of battery packs are arranged side by side in the placement box in sequence; the cooling mechanism comprises a cooling pipe, a connecting pipe and a cooling water tank; a cooling pipe is installed on the surface of the battery pack; under the action of the driving mechanism, the clamping plates on both sides move toward the middle at the same time to push the battery pack, thereby clamping and limiting the plurality of battery packs; the clamping mechanism comprises a placement table, a driving table, a cross rod, a push rod and a push plate; the driving mechanism squeezes the push rod when moving, the push rod is squeezed and contracts to squeeze the cross rod, the cross rod is squeezed to push the push plate forward, the push plate moves forward to push the battery pack, so that the battery pack fits with the inner wall surface of the placement box; the problem of heating of the battery pack and easy displacement of the battery pack during installation is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of photoelectric energy storage and relates to an energy storage device of a photoelectric direct-flexible microgrid. Background Art

[0002] The photovoltaic storage direct-flexible microgrid is a microgrid system that combines photovoltaic power generation, energy storage devices and flexible power transmission technology. Its energy storage device plays a vital role in the entire system. It is responsible for storing the electricity generated by photovoltaic power generation and releasing the electricity when needed to ensure the stable operation of the microgrid. The battery pack is the core part of the energy storage device, which is responsible for storing the electricity generated by the photovoltaic power generation system. The battery pack is usually composed of multiple battery cells connected in series or in parallel to provide the required voltage and capacity.

[0003] Due to the continuous use of battery packs for charging or discharging, a large amount of heat is generated. In addition, the tight spatial arrangement of the batteries will cause the temperature inside the energy storage battery pack to rise rapidly. However, the existing battery packs for photovoltaic, direct and flexible microgrids lack an effective cooling mechanism. In addition, since the battery packs for photovoltaic, direct and flexible microgrids are generally large in size, they are mostly installed by hoisting. This makes it difficult for workers to accurately grasp the installation position of the battery pack when installing the battery pack, and the battery pack may be offset.

[0004] To this end, we propose an energy storage device for a photovoltaic-storage direct-flexible microgrid. Summary of the invention

[0005] The present invention overcomes the shortcomings of the prior art and proposes an energy storage device for a photovoltaic-storage-direct-flexible microgrid, which solves the problems of battery pack heating and easy deviation during installation of the battery pack.

[0006] In order to achieve the above object, the present invention is achieved through the following technical solutions:

[0007] An energy storage device for a photovoltaic storage direct-flexible microgrid comprises a storage box, wherein a plurality of battery groups are sequentially arranged side by side in the storage box; a cooling mechanism, a driving mechanism and a clamping mechanism;

[0008] The cooling mechanism includes a cooling pipe, a connecting pipe and a cooling water tank; the cooling pipe is installed on the surface of the battery pack; a water pump is provided at the water outlet of the cooling water tank; multiple groups of connecting pipe openings are installed on the side wall of the placement box, one end of each group of connecting pipe openings is respectively connected to the two ends of the cooling pipe, and the other end of each group of connecting pipe openings is respectively connected to the water inlet and the water outlet of the cooling water tank, so as to form a cooling water circulation path;

[0009] The driving mechanism includes two movable plates that can move relative to each other; clamping plates are provided on the inner sides of the two side walls of the placement box, and the clamping plates are connected to the movable plates on the same side; under the action of the driving mechanism, the clamping plates on both sides move toward the middle at the same time to push the battery pack, thereby clamping and limiting the position of multiple battery packs;

[0010] The clamping mechanism includes a placement table, a driving table, a cross rod, a push rod and a push plate; each battery pack is placed on a placement table; the placement table is slidably connected to the placement box, and the placement table is equipped with a driving table; both ends of the driving table are slidably connected to limited blocks, and the two ends on one side of the cross rod are respectively rotatably connected to the limit blocks, and a push plate is installed between the two ends on the other side of the cross rod; the battery pack is located on one side of the push plate; a spring is fixedly connected between the two limit blocks; push rods are slidably connected at both ends of the driving table; one end of the push rod is located on the outside of the driving table, and the other end of the push rod extends into the driving table and abuts against the cross rod; the movable plates on both sides contact the push rods at both ends of the placement box; when the movable plate moves, the push rod is squeezed, and the push rod is squeezed and contracted to squeeze the cross rod, and the cross rod is squeezed to push the push plate forward, and the push plate moves forward to push the battery pack, so that the battery pack fits the inner wall surface of the placement box.

[0011] Furthermore, the cooling tube includes a first cooling tube and a second cooling tube; the first cooling tube is installed on the surface of one side of the battery pack, and the second cooling tube is installed on the surface of the other side of the battery pack; the first cooling tube and the second cooling tube are both U-shaped tubular structures, and the outer size of the second cooling tube is larger than that of the first cooling tube, so that the first cooling tube can be embedded in the U-shaped inner side of the second cooling tube.

[0012] Furthermore, the cooling tube also includes a third cooling tube; the third cooling tube is fixed on the inner side of the splint, and the third cooling tube is also a U-shaped tubular structure. The size of the third cooling tube adjacent to the first cooling tube is the same as the size of the second cooling tube; the size of the third cooling tube adjacent to the second cooling tube is the same as the size of the first cooling tube.

[0013] Furthermore, the cooling water tank is installed on the front end surface of the placement box, and two rows of connecting pipe openings are installed upper and lower on the inner side of the side wall of the placement box connected to the cooling water tank. Each row of connecting pipe openings includes multiple pairs of connecting pipe openings arranged equidistantly, and each pair of connecting pipe openings is two connecting pipe openings arranged upper and lower. The water inlet and water outlet of the cooling water tank are respectively connected to connecting pipes, and the two connecting pipes are respectively connected to the upper and lower rows of connecting pipe openings.

[0014] Furthermore, the driving mechanism includes a bidirectional threaded rod and a rotating motor; the outer surfaces of both ends of the bidirectional threaded rod are meshedly connected with a movable plate; and one end of the bidirectional threaded rod is connected to the rotating motor.

[0015] Furthermore, a fixed box is fixedly connected to the back surface of the placement box, and a bidirectional threaded rod is rotatably installed inside the fixed box. A movable groove is opened on the back surface of the placement box located at the fixed box; one end of the movable plate passes through the movable groove and extends into the interior of the placement box and is fixedly connected to the splint.

[0016] Furthermore, the placement platform is a Z-shaped structure, and a track groove with a width adapted to the width of the battery pack is provided on the bottom surface of the placement platform.

[0017] Furthermore, the placement tables are an odd number, and the middle placement table is fixedly connected to the placement box; the inner wall surface of the placement box is symmetrically provided with sliding grooves, and the remaining placement tables are equally divided into two groups and are respectively slidably connected to the sliding grooves on both sides.

[0018] Furthermore, a control panel is installed on the front end surface of the placement box, and the rotating motor and the cooling water tank are electrically controlled and connected by the control panel.

[0019] Furthermore, a sealing cover is installed on the top surface of the placement box, and connection ports are sequentially opened on the top surface of the sealing cover.

[0020] The beneficial effects of the present invention compared with the prior art are as follows:

[0021] The present invention can cool the battery pack in the placement box through the cooperation of the sliding groove, the placement table, the first cooling pipe, the second cooling pipe, the connecting pipe and the cooling water tank, so as to avoid damage caused by excessive temperature of the battery pack; the driving force is provided by the cooperation of the fixing box, the two-way threaded rod, the movable groove, the movable plate, the clamping plate, the third cooling pipe and the rotating motor, and the cooperation of the driving table, the cross rod, the push rod, the limit block, the spring and the push plate avoids the difficulty for workers to accurately grasp the installation position of the battery pack when installing the battery pack, thereby solving the problem of heating of the battery pack and displacement during installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is one of the overall external structure schematic diagrams of the present invention;

[0023] Figure 2 This is the second schematic diagram of the overall external structure of the present invention;

[0024] Figure 3 This is one of the schematic diagrams of the internal structure of the placement box of the present invention;

[0025] Figure 4 It is a partial structural schematic diagram of a bidirectional threaded rod connected to a placement box of the present invention;

[0026] Figure 5 It is a structural schematic diagram of the clamping mechanism of the present invention;

[0027] Figure 6 It is a schematic diagram of a part of the structure of the drive platform of the present invention after being cut apart;

[0028] Figure 7 This is a schematic diagram of the installation structure of the first cooling tube and the second cooling tube of the present invention;

[0029] Figure 8 This is a schematic diagram of the position structure of the connecting pipe opening of the present invention.

[0030] In the figure:

[0031] 1. Placement box; 2. Sealing cover; 3. Connection port; 4. Sliding groove; 5. Placement table; 6. Battery pack; 7. First cooling pipe; 8. Second cooling pipe; 9. Connection pipe; 10. Cooling water tank; 11. Fixing box; 12. Bidirectional threaded rod; 13. Moving groove; 14. Moving plate; 15. Clamp; 16. Third cooling pipe; 17. Rotating motor; 18. Driving table; 19. Cross rod; 20. Push rod; 21. Limit block; 22. Spring; 23. Push plate; 24. Control panel; 25. Water pump; 26. Connection pipe port. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention is further described in detail in conjunction with the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. The technical solutions of the present invention are described in detail below in conjunction with the embodiments and the accompanying drawings, but the scope of protection is not limited thereto.

[0033] See also Figures 1 to 8 This embodiment proposes an energy storage device for a photovoltaic direct-flexible microgrid, including a placement box 1, a cooling mechanism, a driving mechanism and a clamping mechanism.

[0034] A sealing cover 2 is installed on the top surface of the storage box 1 , and connection ports 3 are sequentially opened on the top surface of the sealing cover 2 ; five battery packs 6 are sequentially arranged in the storage box 1 .

[0035] The cooling mechanism includes a first cooling pipe 7, a second cooling pipe 8, a connecting pipe 9, a cooling water tank 10, a clamping plate 15 and a third cooling pipe 16; see Figure 3, a first cooling tube 7 is installed on the left surface of the battery pack 6, and a second cooling tube 8 is installed on the right surface of the battery pack 6; a clamping plate 15 is provided on the inner side of the two side walls of the placement box 1, and a third cooling tube 16 is fixed on the clamping plate 15, and the clamping plates 15 on both sides are parallel to the side walls of the battery pack 6, the third cooling tube 16 on the left is adjacent to the first cooling tube 7 on the leftmost side wall of the battery pack 6, and the third cooling tube 16 on the right is adjacent to the second cooling tube 8 on the rightmost side wall of the battery pack 6; the first cooling tube 7, the second cooling tube 8 and the third cooling tube 16 are all U-shaped tubular structures, and the outer size of the second cooling tube 8 is larger than that of the first cooling tube 7, so that the first cooling tube 7 can be embedded in the U-shaped inner side of the second cooling tube 8; the third cooling tube 16 on the left is the same size as the second cooling tube 8, so that the first cooling tube 7 can be embedded in the U-shaped inner side of the third cooling tube 16 on the left; the third cooling tube 16 on the right is the same size as the first cooling tube 7, so that the third cooling tube 16 on the right can be embedded in the U-shaped inner side of the second cooling tube 8.

[0036] A cooling water tank 10 is installed on the front end surface of the placement box 1. The cooling water tank 10 is an existing cooling water circulation processor, which is used to provide circulating cooling water to the first cooling pipe 7, the second cooling pipe 8 and the third cooling pipe 16. A water pump 25 is arranged at the water outlet of the cooling water tank 10; two rows of connecting pipe openings 26 are installed up and down on the inner side of the side wall of the placement box 1 connected to the cooling water tank 10, each row of connecting pipe openings 26 includes six pairs of connecting pipe openings 26 arranged at equal intervals, and each pair of connecting pipe openings 26 is two connecting pipe openings 26 arranged up and down. The purpose of such arrangement is to dock with the U-shaped pipe openings of the first cooling pipe 7, the second cooling pipe 8 and the third cooling pipe 16 after bonding. The water inlet and the water outlet of the cooling water tank 10 are respectively connected with connecting pipes 9, and the two connecting pipes 9 are respectively connected to the upper and lower rows of connecting pipe openings 26; one of the two connecting pipes 9 is used for return water and the other is used for discharge water. The connecting pipe opening 26 and the U-shaped pipe openings of the first cooling pipe 7, the second cooling pipe 8 and the third cooling pipe 16 can be directly connected by a hose, or an automatic water inlet joint and an electric control valve can be installed at the connecting pipe opening 26, so that the U-shaped pipe openings of the first cooling pipe 7, the second cooling pipe 8 and the third cooling pipe 16 are supplied with water through the electric control valve after the automatic water inlet joint is inserted. Among them, the automatic water inlet joint and the electric control valve are both existing technologies, such as PPR quick plug joints.

[0037] The clamping plates 15 on both sides are connected to the driving mechanism; under the action of the driving mechanism, the clamping plates 15 on both sides move toward the middle at the same time, and the movement of the clamping plates 15 drives the third cooling tube 16 to move, the third cooling tube 16 on the left side is engaged with the first cooling tube 7 on the leftmost battery pack 6, and the third cooling tube 16 on the right side is engaged with the second cooling tube 8 on the rightmost battery pack 6, thereby pushing the battery packs 6 on both sides to move toward the middle, and so on, the five battery packs 6 are clamped and limited, and cooling water pipelines are provided between the five battery packs 6 to cool the batteries.

[0038] The driving mechanism includes a bidirectional threaded rod 12, a moving plate 14 and a rotating motor 17; a fixed box 11 is fixedly connected to the back surface of the placement box 1, and a bidirectional threaded rod 12 is rotatably installed inside the fixed box 11, and a moving groove 13 is opened on the back surface of the placement box 1 located at the fixed box 11; the outer surfaces of both ends of the bidirectional threaded rod 12 are meshed with the moving plates 14, and one end of the moving plate 14 passes through the moving groove 13 and extends into the inside of the placement box 1 and is fixedly connected with the clamping plate 15; one end of the bidirectional threaded rod 12 is fixedly connected to the output shaft of the rotating motor 17, and the rotating motor 17 is fixedly set on the placement box 1. Start the rotating motor 17, and the operation of the rotating motor 17 drives the bidirectional threaded rod 12 to rotate, and the rotation of the bidirectional threaded rod 12 drives the moving plate 14 meshed with the outer surface to move in the moving groove 13, and the movement of the moving plate 14 drives the clamping plate 15 to move, and the movement of the clamping plate 15 drives the third cooling pipe 16 to move together.

[0039] The clamping mechanism is installed inside the placement box 1, and the clamping mechanism includes a placement table 5, a driving table 18, a cross bar 19, a push rod 20 and a push plate 23; the placement table 5 is a Z-shaped structure as a whole, and the bottom surface of the placement table 5 is relatively long for placing the battery pack 6; the bottom surface of the placement table 5 is provided with a track groove whose width is adapted to the width of the battery pack 6 to prevent the battery pack 6 from shifting when moving. Each battery pack 6 is equipped with a placement table 5; the inner wall surface of the placement box 1 is symmetrically provided with sliding grooves 4, the top of the middle placement table 5 is fixedly connected to the inner wall of the placement box 1, and the remaining four placement tables 5 are equally divided into two groups and their tops are symmetrically inserted into the sliding grooves 4 on both sides and are slidably connected to the placement box 1 through the sliding grooves 4, and the rear surface of the bottom surface of the placement table 5 is installed.

[0040] The two ends of the top of the driving platform 18 are slidably connected to the limit blocks 21, and a cross bar 19 is installed inside the driving platform 18. The two ends of one side of the cross bar 19 are respectively rotatably connected to the limit blocks 21, and a push plate 23 is installed between the two ends of the other side of the cross bar 19. A spring 22 is fixedly connected between the two limit blocks 21; push rods 20 are slidably connected at both ends of the driving platform 18; one end of the push rod 20 is located outside the driving platform 18, and the other end of the push rod 20 extends into the driving platform 18 and abuts against the cross bar 19; the moving plates 14 on both sides contact the push rods 20 at both ends of the placement box 1; when the moving plates 14 move, the push rods 20 are squeezed, and the push rods 20 are squeezed and contracted to squeeze the cross bar 19, and the cross bar 19 is squeezed to push the push plate 23 forward, and the push plate 23 moves forward to push the battery pack 6, so that the battery pack 6 fits the inner wall surface of the placement box 1.

[0041] A control panel 24 is installed on the front end surface of the storage box 1 , and the rotating motor 17 , the cooling water tank 10 and various electronic control components are electrically controlled and connected by the control panel 24 .

[0042] The working principle of the energy storage device of the photovoltaic direct-flexible microgrid proposed in this embodiment is as follows:

[0043] When the device is needed, the battery pack 6 is first placed on the placement table 5, and then the rotating motor 17 is started. The rotating motor 17 drives the bidirectional threaded rod 12 to rotate, and the bidirectional threaded rod 12 rotates to drive the moving plate 14 engaged with the outer surface to move in the moving groove 13. The movement of the moving plate 14 drives the clamping plate 15 to move, and the movement of the clamping plate 15 drives the third cooling tube 16 to move together. The movement of the moving plate 14 squeezes the push rod 20, and the push rod 20 is squeezed and contracted to squeeze the cross rod 19. The cross rod 19 is squeezed and pushes the push plate 23 to move forward. The push plate 23 moves forward to push the battery pack 6, so that the battery pack 6 and the inner wall surface of the placement box 1 are in contact. The third cooling tube 16 and the first cooling tube 7 are in contact with the surface of the battery pack 6 at the same time, so that the first cooling tube 7 and the second cooling tube 8 cooperate to fit the battery pack 6, and the battery pack 6 is clamped and limited. The ports of the third cooling tube 16, the first cooling tube 7 and the second cooling tube 8 are all connected to the connecting pipe port 26. At this time, the cooling water in the cooling water tank 10 is transported to the water pump 25 through the connecting pipe 9, and then the water pump 25 is used to operate to inject the cooling water into the connecting pipe port 26 and enter the first cooling tube 7, the second cooling tube 8 and the third cooling tube 16, and the cooling treatment is carried out by the contact between the cooling water and the surface of the battery pack 6.

[0044] The above content is a further detailed description of the present invention in combination with a specific preferred embodiment. It cannot be determined that the specific embodiments of the present invention are limited to this. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the present invention, which should be regarded as belonging to the present invention and the scope of patent protection determined by the submitted claims.

Claims

1. An energy storage device for a photovoltaic-storage direct-flexible microgrid, comprising a storage box (1), wherein a plurality of battery groups (6) are sequentially arranged side by side in the storage box (1); characterized in that: It also includes a cooling mechanism, a driving mechanism and a clamping mechanism; The cooling mechanism comprises a cooling pipe, a connecting pipe (9) and a cooling water tank (10); the cooling water tank (10) is mounted on the front end surface of the placement box (1), and the surface of the battery pack (6) is mounted with a cooling pipe; the cooling pipe comprises a first cooling pipe (7) and a second cooling pipe (8); the surface of one side of the battery pack (6) is mounted with the first cooling pipe (7), and the surface of the other side of the battery pack (6) is mounted with the second cooling pipe (8); the first cooling pipe (7) and the second cooling pipe (8) are both U-shaped tubular structures, and the outer size of the second cooling pipe (8) is larger than that of the first cooling pipe (7), so that the first cooling pipe (7) can be embedded in the U-shaped inner side of the second cooling pipe (8); A water pump (25) is provided at the water outlet of the cooling water tank (10); a plurality of groups of connecting pipe openings (26) are installed on the inner side of the side wall of the placement box (1) connected to the cooling water tank (10), one end of each group of connecting pipe openings (26) is respectively connected to the two ends of the cooling pipe, and the other end of each group of connecting pipe openings (26) is respectively connected to the water inlet and the water outlet of the cooling water tank (10), so as to form a cooling water circulation path; The driving mechanism comprises a bidirectional threaded rod (12), a rotating motor (17) and two relatively movable plates (14); both ends of the bidirectional threaded rod (12) are meshedly connected to the movable plates (14); one end of the bidirectional threaded rod (12) is connected to the rotating motor (17); a clamping plate (15) is provided on the inner sides of the two side walls of the placement box (1), and the clamping plate (15) is connected to the movable plate (14) on the same side; under the action of the driving mechanism, the clamping plates (15) on both sides simultaneously move toward the middle to push the battery pack (6), thereby clamping and limiting the position of multiple battery packs (6); the clamping mechanism comprises a placement table (5), a driving table (18), a cross rod (19), a push rod (20) and a push plate (23); each battery pack (6) is placed on a placement table (5); the placement table (5) is slidably connected to the placement box (1), and the placement table (5) is installed with a driving table (18); both ends of the driving table (18) are slidably connected to the limiting blocks (21 ), two ends of one side of the cross bar (19) are rotatably connected to the limit blocks (21), and a push plate (23) is installed between the two ends of the other side of the cross bar (19); the battery pack (6) is located on one side of the push plate (23); a spring (22) is fixedly connected between the two limit blocks (21); push rods (20) are slidably connected at both ends of the driving platform (18); one end of the push rod (20) is located outside the driving platform (18), and the other end of the push rod (20) extends into the driving platform (18). 8) and abut against the cross bar (19); the movable plates (14) on both sides contact the push rods (20) at both ends of the placement box (1); when the movable plates (14) move, the push rods (20) are squeezed, and the push rods (20) are squeezed and contracted to squeeze the cross bar (19), and the cross bar (19) is squeezed to push the push plate (23) forward, and the push plate (23) moves forward to push the battery pack (6), so that the battery pack (6) fits the inner wall surface of the placement box (1).

2. The energy storage device of the photovoltaic-storage-direct-flexible microgrid according to claim 1 is characterized in that: The cooling tube also includes a third cooling tube (16); the third cooling tube (16) is fixed on the inner side of the clamping plate (15); the third cooling tube (16) is also a U-shaped tubular structure; the size of the third cooling tube (16) adjacent to the first cooling tube (7) is the same as the size of the second cooling tube (8); the size of the third cooling tube (16) adjacent to the second cooling tube (8) is the same as the size of the first cooling tube (7).

3. The energy storage device of the photovoltaic-storage-direct-flexible microgrid according to claim 2 is characterized in that: Two rows of connecting pipe openings (26) are installed on the inner side of the side wall of the placement box (1) connected to the cooling water tank (10), each row of connecting pipe openings (26) includes a plurality of pairs of connecting pipe openings (26) arranged at equal intervals, each pair of connecting pipe openings (26) is two connecting pipe openings (26) arranged one above the other, the water inlet and the water outlet of the cooling water tank (10) are respectively connected to connecting pipes (9), and the two connecting pipes (9) are respectively connected to the two rows of connecting pipe openings (26) above and below.

4. The energy storage device of the photovoltaic-storage-direct-flexible microgrid according to claim 1 is characterized in that: A fixing box (11) is fixedly connected to the back surface of the placement box (1), and a bidirectional threaded rod (12) is rotatably mounted inside the fixing box (11). A moving groove (13) is provided on the back surface of the placement box (1) at the fixing box (11); one end of a moving plate (14) passes through the moving groove (13) and extends into the interior of the placement box (1) and is fixedly connected to a clamping plate (15).

5. The energy storage device of the photovoltaic-storage-direct-flexible microgrid according to claim 1 is characterized in that: The placement platform (5) is a Z-shaped structure, and a track groove having a width adapted to the width of the battery pack (6) is provided on the bottom surface of the placement platform (5).

6. The energy storage device of the photovoltaic-storage-direct-flexible microgrid according to claim 1 is characterized in that: The placement tables (5) are an odd number, and the middle placement table (5) is fixedly connected to the placement box (1); the inner wall surface of the placement box (1) is symmetrically provided with sliding grooves (4), and the remaining placement tables (5) are equally divided into two groups and are respectively slidably connected to the sliding grooves (4) on both sides.

7. The energy storage device of the photovoltaic-storage-direct-flexible microgrid according to claim 1 is characterized in that: A control panel (24) is installed on the front surface of the placement box (1), and the rotating motor (17) and the cooling water tank (10) are electrically controlled and connected by the control panel (24).

8. The energy storage device of the photovoltaic-storage-direct-flexible microgrid according to claim 1 is characterized in that: A sealing cover (2) is installed on the top surface of the placement box (1), and connection ports (3) are sequentially opened on the top surface of the sealing cover (2).

Images