Ship distribution box capable of avoiding water vapor erosion

Abstract

The utility model discloses a ship distribution box capable of avoiding water vapor erosion, which relates to the field of ship distribution boxes and comprises a box body, an inner cavity is arranged in the box body, two groups of round holes are arranged at the bottom of the inner cavity, a cover plate is movably mounted on one side of the box body through a connecting device, and a sealing convex block and a first inclined block are fixedly mounted on the cover plate. A limiting plate is fixed to the bottom of the inner cavity, a round hole is formed in the limiting plate, a fixed inflation ring is installed in the round hole, and a sealing inflation ring is arranged in the fixed inflation ring. According to the ship distribution box capable of avoiding water vapor erosion, the problem that an existing ship distribution box capable of avoiding water vapor erosion is poor in sealing effect is solved, the limiting plate is fixedly installed between the box body and the bottom plate, the fixed inflation ring is arranged in the circular hole formed in the limiting plate in a sleeved mode, and the sealing inflation ring is arranged on one side of the fixed inflation ring; and a plurality of groups of first sealing blocks and second sealing blocks are sequentially arranged on the inner ring of the sealing inflation ring.

Description

Technical Field

[0001] The utility model relates to the field of ship distribution boxes, in particular to a ship distribution box which can avoid water vapor corrosion. Background Art

[0002] A distribution box is an electrical device used for the distribution, control and protection of electric energy in a power system. It assembles switchgear, measuring instruments, protective electrical appliances and auxiliary equipment in a closed or semi-enclosed metal cabinet or on a screen in accordance with electrical wiring requirements to form a low-voltage distribution device. The main function of the distribution box is to reasonably distribute electric energy, facilitate the opening and closing operations of the circuit, and have a high level of safety protection. It can intuitively display the conduction status of the circuit. The structure of the distribution box usually includes a casing, partitions, line inlets, line outlets, terminal connection devices, fuses and protective devices, etc. However, when the distribution box is used on a ship, the original structure will allow water vapor to enter the interior of the distribution box, thereby corroding the distribution box and affecting its normal use.

[0003] An existing ship distribution box that can avoid water vapor erosion mainly has a bellows on the top of the ship distribution box, an exhaust fan inside the bellows, an air duct connected to one side of the bellows, one end of the air duct passes through the partition inside the ship distribution box and is installed at the bottom of the ship distribution box. When the ship distribution box is in use, the exhaust fan runs to introduce external air into the interior of the ship distribution box, thereby increasing the fluidity of the air, thereby achieving the effect of avoiding water vapor erosion.

[0004] However, for an existing ship distribution box that can avoid water vapor erosion, if the air at the location where the ship distribution box is installed is relatively humid, if an exhaust fan is used to increase the air flow inside the ship distribution box, the erosion of the ship distribution box by water vapor will be enhanced, and the use effect of the device cannot be achieved. Moreover, since the ship distribution box needs to connect multiple sets of wires, when multiple sets of thicker wires enter the ship distribution box through the wire entry holes, gaps will inevitably be generated, allowing water vapor to enter, thereby causing erosion to the ship distribution box. Utility Model Content

[0005] Based on this, the purpose of the present invention is to provide a ship distribution box that can avoid water vapor corrosion, so as to solve the technical problem that the existing ship distribution box that can avoid water vapor corrosion has poor sealing effect.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solution: a ship distribution box that can avoid water vapor erosion, comprising a box body, the box body has an inner cavity, the bottom of the inner cavity has two groups of circular holes, a cover plate is movably installed on one side of the box body through a connecting device, the cover plate is fixedly installed with a sealing protrusion and a first oblique block, the bottom of the inner cavity is fixed with a limit plate, a circular hole is opened in the limit plate, and a fixed inflatable ring is installed inside the circular hole, a sealing inflatable ring is provided inside the fixed inflatable ring, one side of the sealing inflatable ring is fixed with a first sealing block and a second sealing block in sequence, one side of the fixed inflatable ring is connected to a connecting pipe, the other end of the connecting pipe is fixedly installed on the air guide pipe, one end of the air guide pipe is fixedly installed with an air guide valve, and the other end of the air guide pipe is fixedly installed with an exhaust valve, the surface of the limiting plate is fixed with a bottom plate, a rubber layer is fixedly installed on one side of the box body, a sealing groove is opened on one side of the rubber layer, and a second oblique block is fixedly installed between the rubber layers.

[0007] By adopting the above technical solution, the problem of poor sealing effect of the existing ship distribution box that can avoid water vapor erosion is solved. A limit plate is fixedly installed between the box body and the bottom plate, and a fixed inflatable ring is set inside the circular hole opened in the limit plate. A sealing inflatable ring is provided on one side of the fixed inflatable ring, and the inner ring of the sealing inflatable ring is sequentially provided with multiple groups of first sealing blocks and second sealing blocks. When the fixed inflatable ring and the sealing inflatable ring are not inflated, the sealing inflatable ring is in a contracted state. At this time, multiple groups of wires are passed through the sealing inflatable ring, and the protrusions at the ends of the second sealing blocks are inserted between the wires. Then, the exhaust valve is closed, and the air guide valve is opened to fill the air guide pipe with gas. The gas is introduced into the sealing inflatable ring through the connecting pipe, causing the sealing inflatable ring to expand and thus fit tightly with the multiple groups of wires, reducing the gaps between the wires, thereby achieving a sealing effect. In addition, the two sides of the first sealing block are set as curved surfaces, which can better fit with the wires. The end of the second sealing block is provided with a protrusion, which can further reduce the gaps between the wires, thereby enhancing the sealing effect of the device and preventing water vapor from entering the ship distribution box and causing erosion inside the distribution box.

[0008] The present invention is further configured such that a circular hole is provided inside the bottom plate, and the diameter of the circular hole provided inside the bottom plate is the same as the diameter of the circular hole provided at the bottom of the inner cavity.

[0009] By adopting the above technical solution, circular holes are opened inside the bottom plate and at the bottom of the inner cavity, and the diameter of the circular hole opened inside the bottom plate is the same as the diameter of the circular hole opened at the bottom of the inner cavity, which facilitates the installation of the sealing inflatable ring without affecting the normal use of the sealing inflatable ring.

[0010] The present invention is further configured such that the diameter of the circular hole opened inside the limiting plate is larger than the diameter of the circular hole opened inside the bottom plate and the diameter of the circular hole opened at the bottom of the inner cavity.

[0011] By adopting the above technical solution, by making the diameter of the circular hole opened inside the limiting plate larger than the diameter of the circular hole opened inside the bottom plate and the diameter of the circular hole opened at the bottom of the inner cavity, it is convenient to fix the fixed inflatable ring between the bottom plate and the inner cavity, while preventing the fixed inflatable ring from falling off, thereby affecting the normal use of the device.

[0012] The utility model is further configured such that the diameter of the fixed inflatable ring is larger than the diameter of the sealing inflatable ring, and the fixed inflatable ring is sleeved in the circular hole opened inside the limiting plate, and the two ends of the sealing inflatable ring are respectively sleeved in the circular hole opened at the bottom of the inner cavity and the circular hole opened inside the bottom plate.

[0013] By adopting the above technical solution, by setting the diameter of the fixed inflatable ring to be larger than the diameter of the sealing inflatable ring, the sealing inflatable ring is set in the circular hole opened at the bottom of the inner cavity and the circular hole opened inside the bottom plate. By fixing the fixed inflatable ring between the bottom plate and the inner cavity, the sealing inflatable ring is fixed between the circular hole opened at the bottom of the inner cavity and the circular hole opened inside the bottom plate, which can prevent the sealing inflatable ring from falling off, thereby affecting the normal use of the device.

[0014] The present invention is further configured such that through holes are symmetrically provided on both sides of the box body, and air guide tubes are sleeved inside the through holes symmetrically provided on both sides of the box body.

[0015] By adopting the above technical solution, the symmetrical through holes on both sides of the box body can limit the air guide tube and prevent the air guide tube from sliding inside the box body.

[0016] The present invention is further configured such that the first sealing block is provided with two layers on the inner side of the sealing inflatable ring, and the first sealing block is arranged in a ring shape on the inner side of the sealing inflatable ring.

[0017] By adopting the above technical solution, by arranging the first sealing block in a ring shape on the inner side of the sealing inflatable ring and providing two layers, the contact area between the first sealing block and the wire can be increased, thereby reducing the gap between the wires, enhancing the sealing efficiency of the sealing inflatable ring, and enabling the ship distribution box to achieve the desired use effect.

[0018] The utility model is further configured such that one side of the first oblique block and the second oblique block are both provided with an inclined surface, one side of the rubber layer is provided with an inclined surface, and the first oblique block, the second oblique block, the first sealing block and the second sealing block are all configured to be a relatively soft rubber material.

[0019] By adopting the above technical solution, by providing inclined surfaces on one side of the first oblique block and the second oblique block, the contact between the first oblique block and the second oblique block is made tighter, thereby enhancing the sealing effect of the ship's distribution box. By setting the first sealing block and the second sealing block to a relatively soft rubber material, it is convenient for the wires to squeeze the first sealing block and the second sealing block, so that the first sealing block and the second sealing block occupy more space.

[0020] The present invention is further configured such that two sides of the first sealing block are configured as curved surfaces, and the end portion of the second sealing block is configured with a protrusion.

[0021] By adopting the above technical solution, by setting the two sides of the first sealing block as curved surfaces, the contact area of ​​the first sealing block is enhanced, and a gap is avoided between the wire and the first sealing block. By setting a protrusion at the end of the second sealing block, when the wire squeezes the protrusion, the protrusion will occupy more gap, thereby achieving the purpose of reducing the gap and making the sealing effect of the ship distribution box better.

[0022] In summary, the present invention has the following beneficial effects:

[0023] 1. The utility model solves the problem of poor sealing effect of the existing ship distribution box that can avoid water vapor erosion by providing a sealing protrusion, a first oblique block, an inner cavity, a rubber layer, a sealing groove, a second oblique block, an air guide pipe, an air guide valve, an exhaust valve, a connecting pipe, a fixed inflatable ring, a sealed inflatable ring, a first sealing block, a limiting plate, a bottom plate and a second sealing block. The limiting plate is fixedly installed between the box body and the bottom plate, and a fixed inflatable ring is sleeved inside the circular hole opened inside the limiting plate. A sealed inflatable ring is provided on one side of the fixed inflatable ring, and the inner ring of the sealed inflatable ring is sequentially provided with multiple groups of first sealing blocks and second sealing blocks. When the fixed inflatable ring and the sealed inflatable ring are not inflated, the sealing block is provided in a closed position. The sealing inflatable ring is in a contracted state. At this time, multiple sets of wires are passed through the sealing inflatable ring, and the convex block at the end of the second sealing block is inserted between the wires. Then the exhaust valve is closed, and the air guide valve is opened to fill the air guide pipe with gas. The gas is introduced into the sealing inflatable ring through the connecting pipe, so that the sealing inflatable ring expands and fits tightly with the multiple sets of wires, reducing the gaps between the wires, thereby achieving a sealing effect. Moreover, the two sides of the first sealing block are set to curved surfaces, which can better fit the wires. The end of the second sealing block is provided with a bulge, which can further reduce the gaps between the wires, thereby enhancing the sealing effect of the device and preventing water vapor from entering the ship's distribution box and causing erosion inside the distribution box.

[0024] 2. The utility model is provided with a rubber layer, and a sealing groove is opened inside the rubber layer. A second oblique block is provided between the rubber layers, and a first oblique block is installed on one side of the cover. When the cover is in a closed state, the sealing protrusion provided on one side of the cover will be embedded in the sealing groove. The first oblique block on one side of the cover is tightly against the second oblique block, so that the ship distribution box is sealed, thereby achieving the effect of isolating water vapor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the closed structure of the utility model;

[0026] Figure 2 This is a first structural diagram of the utility model;

[0027] Figure 3 This is a first partial enlarged view of the present invention;

[0028] Figure 4 This is a schematic diagram of the structure of the gas guide component of the utility model;

[0029] Figure 5 This is a cross-sectional view of the air guide assembly of the present utility model;

[0030] Figure 6 This is a schematic diagram of the bottom structure of the utility model;

[0031] Figure 7 This is a partial enlarged view of the sealing block of the present utility model;

[0032] Figure 8 This is a second structural diagram of the present utility model;

[0033] Figure 9 This is a schematic diagram of the third structure of the utility model;

[0034] Figure 10 This is a fourth structural diagram of the present utility model.

[0035] In the figure: 1. Box body; 2. Cover plate; 21. Sealing protrusion; 22. First oblique block; 3. Inner cavity; 4. Rubber layer; 41. Sealing groove; 42. Second oblique block; 5. Air guide tube; 51. Air guide valve; 52. Exhaust valve; 53. Connecting pipe; 6. Fixed inflatable ring; 61. Sealing inflatable ring; 62. First sealing block; 63. Second sealing block; 7. Limiting plate; 8. Bottom plate. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0037] The following describes an embodiment of the present invention based on its overall structure.

[0038] A ship distribution box capable of avoiding water vapor corrosion, such as Figure 1 - Figure 10As shown, it includes a box body 1, an inner cavity 3 is opened inside the box body 1, and two groups of circular holes are opened at the bottom of the inner cavity 3 to facilitate the fixation of the air guide tube 5. A cover plate 2 is movably installed on one side of the box body 1 through a connecting device. The cover plate 2 is fixedly installed with a sealing protrusion 21 and a first inclined block 22. A limiting plate 7 is fixed at the bottom of the inner cavity 3. A circular hole is opened inside the limiting plate 7, and a fixed inflatable ring 6 is installed inside the circular hole. The fixed inflatable ring 6 can be limited by the circular hole to prevent the fixed inflatable ring 6 from falling off, thereby affecting the normal use of the device. A sealing inflatable ring 61 is provided inside the fixed inflatable ring 6, and a first sealing block 62 and a second sealing block 63 are fixed on one side of the sealing inflatable ring 61 in sequence. By providing the first sealing Block 62 and the second sealing block 63 can effectively reduce the gap between multiple groups of wires, thereby enhancing the sealing of the ship's distribution box. A connecting pipe 53 is connected to one side of the fixed inflatable ring 6, and the other end of the connecting pipe 53 is fixedly installed on the air guide pipe 5. An air guide valve 51 is fixedly installed at one end of the air guide pipe 5, and an exhaust valve 52 is fixedly installed at the other end of the air guide pipe 5. By arranging the air guide valve 51 and the exhaust valve 52 at both ends of the air guide pipe 5, the charging and discharging states of the sealed inflatable ring 61 and the fixed inflatable ring 6 can be controlled. A bottom plate 8 is fixed to the surface of the limiting plate 7, a rubber layer 4 is fixedly installed on one side of the box body 1, a sealing groove 41 is opened on one side of the rubber layer 4, and a second oblique block 42 is fixedly installed between the rubber layers 4.

[0039] See also Figure 8 and Figure 10 A circular hole is opened inside the bottom plate 8, and the diameter of the circular hole opened inside the bottom plate 8 is the same as the diameter of the circular hole opened at the bottom of the inner cavity 3. By opening circular holes inside the bottom plate 8 and the bottom of the inner cavity 3, and the diameter of the circular hole opened inside the bottom plate 8 is the same as the diameter of the circular hole opened at the bottom of the inner cavity 3, it is convenient to install the sealing inflatable ring 61 without affecting the normal use of the sealing inflatable ring 61.

[0040] See also Figure 9 The diameter of the circular hole opened inside the limiting plate 7 is larger than the diameter of the circular hole opened inside the bottom plate 8 and the diameter of the circular hole opened at the bottom of the inner cavity 3. By making the diameter of the circular hole opened inside the limiting plate 7 larger than the diameter of the circular hole opened inside the bottom plate 8 and the diameter of the circular hole opened at the bottom of the inner cavity 3, it is convenient to fix the fixed inflatable ring 6 between the bottom plate 8 and the inner cavity 3, and at the same time prevent the fixed inflatable ring 6 from falling off, thereby affecting the normal use of the device.

[0041] See also Figure 4 and Figure 9The diameter of the fixed inflatable ring 6 is larger than the diameter of the sealing inflatable ring 61, and the fixed inflatable ring 6 is sleeved in the circular hole opened inside the limiting plate 7, and the two ends of the sealing inflatable ring 61 are respectively sleeved in the circular hole opened at the bottom of the inner cavity 3 and the circular hole opened inside the bottom plate 8. By setting the diameter of the fixed inflatable ring 6 to be larger than the diameter of the sealing inflatable ring 61, the sealing inflatable ring 61 is sleeved in the circular hole opened at the bottom of the inner cavity 3 and the circular hole opened inside the bottom plate 8. By fixing the fixed inflatable ring 6 between the bottom plate 8 and the inner cavity 3, the sealing inflatable ring 61 is fixed between the circular hole opened at the bottom of the inner cavity 3 and the circular hole opened inside the bottom plate 8, which can prevent the sealing inflatable ring 61 from falling off, thereby affecting the normal use of the device.

[0042] See also Figure 8 The box body 1 has symmetrical through holes on both sides, and an air guide tube 5 is sleeved inside the through holes symmetrically opened on both sides of the box body 1. The symmetrical through holes on both sides of the box body 1 limit the air guide tube 5 and prevent the air guide tube 5 from sliding inside the box body 1.

[0043] See also Figure 7 The first sealing block 62 is provided with two layers on the inner side of the sealing inflatable ring 61, and the first sealing block 62 is arranged in a ring shape on the inner side of the sealing inflatable ring 61. By arranging the first sealing block 62 in a ring shape on the inner side of the sealing inflatable ring 61 and providing two layers, the contact area between the first sealing block 62 and the wire can be increased, thereby reducing the gap between the wires, enhancing the sealing efficiency of the sealing inflatable ring 61, and making the ship distribution box achieve the desired use effect.

[0044] See also Figure 3 The first oblique block 22 and the second oblique block 42 are both provided with an inclined surface on one side, and the rubber layer 4 is provided with an inclined surface on one side. The first oblique block 22, the second oblique block 42, the first sealing block 62 and the second sealing block 63 are all set to a relatively soft rubber material. By providing an inclined surface on one side of the first oblique block 22 and the second oblique block 42, the first oblique block 22 and the second oblique block 42 are in closer contact, thereby enhancing the sealing effect of the ship distribution box. By setting the first sealing block 62 and the second sealing block 63 to a relatively soft rubber material, it is convenient for the wire to squeeze the first sealing block 62 and the second sealing block 63, so that the first sealing block 62 and the second sealing block 63 occupy more space.

[0045] See also Figure 3 The two sides of the first sealing block 62 are set to curved surfaces, and the end of the second sealing block 63 is provided with a protrusion. By setting the two sides of the first sealing block 62 to curved surfaces, the contact area of ​​the first sealing block 62 is enhanced, and a gap is avoided between the wire and the first sealing block 62. By providing a protrusion at the end of the second sealing block 63, when the wire squeezes the protrusion, the protrusion will occupy more gaps, thereby achieving the purpose of reducing the gap and making the sealing effect of the ship distribution box better.

[0046] The working principle of the present invention is as follows: when assembling the control device inside the ship's distribution box, it is necessary to introduce the wires first. At this time, the fixed inflatable ring 6 and the sealing inflatable ring 61 are not inflated, and the sealing inflatable ring 61 is in a contracted state. At this time, multiple groups of wires are passed through the sealing inflatable ring 61, and the protrusions at the ends of the second sealing block 63 are inserted between the wires. Then, the exhaust valve 52 is closed, and the air guide valve 51 is opened to fill the air into the air guide pipe 5. The gas will be introduced into the sealing inflatable ring 61 through the connecting pipe 53, so that the sealing inflatable ring 61 expands and fits tightly with the multiple groups of wires, reducing the gaps between the wires, thereby achieving a sealing effect. Moreover, both sides of the first sealing block 62 are set as curved surfaces, which can better fit with the wires. The end of the second sealing block 63 is provided with a protrusion. It can further reduce the gap between the wires, thereby enhancing the sealing effect of the device, and through the close fit of the first sealing block 62 and the second sealing block 63 with the wires, the friction between the sealing inflatable ring 61 and the wires is enhanced, making the wires not easy to slip, which is convenient for the use of the device. After the inflatable ring 6 and the sealing inflatable ring 61 are fixed and the air guide valve 51 is closed, and after the wires are connected to the control device, the cover plate 2 is rotated, and the sealing protrusion 21 provided on one side of the cover plate 2 is embedded into the sealing groove 41 opened on one side of the rubber layer 4. The first inclined block 22 on one side of the cover plate 2 will be tightly fixed to the second inclined block 42 installed on the inner wall of the box body 1, so that the ship distribution box is sealed, achieving the effect of isolating water vapor and avoiding water vapor from corroding the inside of the ship distribution box.

[0047] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not limitations on the present invention. The specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and purpose of the present invention, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A ship distribution box capable of avoiding water vapor erosion, comprising a box body (1), characterized in that: The box body (1) is provided with an inner cavity (3), and two groups of circular holes are provided at the bottom of the inner cavity (3). A cover plate (2) is movably mounted on one side of the box body (1) through a connecting device, and a sealing protrusion (21) and a first inclined block (22) are fixedly mounted on the cover plate (2). A limiting plate (7) is fixed at the bottom of the inner cavity (3), and a circular hole is provided inside the limiting plate (7), and a fixed inflatable ring (6) is installed inside the circular hole. A sealing inflatable ring (61) is provided inside the fixed inflatable ring (6), and a first sealing block (61) is fixed on one side of the sealing inflatable ring (61). 2) and a second sealing block (63), one side of the fixed inflatable ring (6) is connected to a connecting pipe (53), the other end of the connecting pipe (53) is fixedly mounted on the air guide pipe (5), one end of the air guide pipe (5) is fixedly mounted with an air guide valve (51), and the other end of the air guide pipe (5) is fixedly mounted with an exhaust valve (52), a bottom plate (8) is fixedly mounted on the surface of the limiting plate (7), a rubber layer (4) is fixedly mounted on one side of the box body (1), a sealing groove (41) is opened on one side of the rubber layer (4), and a second inclined block (42) is fixedly mounted between the rubber layers (4).

2. A ship distribution box capable of avoiding water vapor corrosion according to claim 1, characterized in that: A circular hole is provided inside the bottom plate (8), and the diameter of the circular hole provided inside the bottom plate (8) is the same as the diameter of the circular hole provided at the bottom of the inner cavity (3).

3. A ship distribution box capable of avoiding water vapor corrosion according to claim 1, characterized in that: The diameter of the circular hole opened inside the limiting plate (7) is larger than the diameter of the circular hole opened inside the bottom plate (8) and the diameter of the circular hole opened at the bottom of the inner cavity (3).

4. A ship distribution box capable of avoiding water vapor corrosion according to claim 1, characterized in that: The diameter of the fixed inflatable ring (6) is larger than the diameter of the sealing inflatable ring (61), and the fixed inflatable ring (6) is sleeved in a circular hole opened inside the limiting plate (7), and the two ends of the sealing inflatable ring (61) are respectively sleeved in a circular hole opened at the bottom of the inner cavity (3) and a circular hole opened inside the bottom plate (8).

5. The ship distribution box capable of preventing water vapor corrosion according to claim 1, characterized in that: Through holes are symmetrically provided on both sides of the box body (1), and air guide tubes (5) are sleeved inside the through holes symmetrically provided on both sides of the box body (1).

6. The ship distribution box capable of preventing water vapor corrosion according to claim 1, characterized in that: The first sealing block (62) is provided with two layers on the inner side of the sealing inflatable ring (61), and the first sealing block (62) is arranged in an annular shape on the inner side of the sealing inflatable ring (61).

7. The ship distribution box capable of preventing water vapor corrosion according to claim 1, characterized in that: One side of the first inclined block (22) and the second inclined block (42) is provided with an inclined surface, and one side of the rubber layer (4) is provided with an inclined surface. The first inclined block (22), the second inclined block (42), the first sealing block (62) and the second sealing block (63) are all made of relatively soft rubber material.

8. The ship distribution box capable of preventing water vapor corrosion according to claim 1, characterized in that: Both sides of the first sealing block (62) are arranged as curved surfaces, and the end of the second sealing block (63) is provided with a protrusion.

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