High-waterproofness low-voltage direct-current bus duct

Abstract

The invention discloses a high-waterproofness low-voltage direct-current bus duct, and relates to the field of bus ducts, the high-waterproofness low-voltage direct-current bus duct comprises a bus duct, a bus duct cover body is arranged above the bus duct, an upper sealing shell is arranged on the upper surface of the bus duct cover body in a splicing manner, and a lower sealing shell is arranged on the periphery of the bottom of the bus duct in a splicing manner; the bottom of the upper sealing shell and the upper surface of the lower sealing shell are attached and kept sealed, and an upper cavity is formed in the upper sealing shell. A waterproof structure wrapping the whole bus duct and the bus duct cover body is formed between the upper sealing shell and the lower sealing shell, the waterproof effect on the bus duct is improved, when water flows through the rubber channel, due to the effect of water pressure, the rubber channel can be squeezed towards the inner wall of the rectangular groove, and therefore the sealing performance is higher, the waterproof effect is better, and the service life of the bus duct is prolonged. And even if the rubber channel is aged, the water pressure can still extrude the rubber channel towards the inner wall of the rectangular groove, so that a good waterproof effect is kept.

Description

Technical Field

[0001] The invention relates to the field of bus ducts, and in particular to a low-voltage direct current bus duct with high waterproofness. Background Art

[0002] When the existing bus duct is placed outdoors, its use is indeed easily affected by rain, causing the inside of the bus duct to be damp, which in turn causes risks such as reduced insulation performance, short circuit and even equipment damage. In order to deal with this problem, some bus ducts are cast to enhance their waterproof performance. However, although this cast bus duct can effectively prevent water, its material and structure often make it more sensitive to changes in ambient temperature. In a high temperature environment, the casting material is prone to expansion or softening, resulting in a decrease in its sealing performance, while in a low temperature environment, the material may become rigid or even crack, which also affects its waterproof effect. In addition, changes in ambient temperature may also affect the electrical properties inside the bus duct, such as conductivity and insulation performance, and thus affect the safe and stable operation of the entire power system. As for the bus ducts used in normal use, the waterproof design is not ideal. Although the humidity in the air has little effect on their operation when these bus ducts are used indoors, once they are placed in an outdoor environment, especially when exposed to rain for a long time, their waterproof performance is weak, which will cause problems such as moisture inside the bus duct and reduced insulation performance, posing a threat to the safety of the power system.

[0003] Therefore, it is necessary to propose a highly waterproof low-voltage DC bus duct to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide a low-voltage DC bus duct with high waterproofness, so as to solve the problem that the bus duct is placed in an outdoor environment, especially exposed to rain for a long time, and its waterproof performance is weak, which will cause the bus duct to become damp inside and the insulation performance to decrease, posing a threat to the safety of the power system.

[0005] To achieve the above object, the present invention provides the following technical solution: a highly waterproof low-voltage DC bus duct, comprising a bus duct, a bus duct cover is arranged above the bus duct, an upper sealing shell is spliced ​​on the upper surface of the bus duct cover, a lower sealing shell is spliced ​​on the outer periphery of the bottom of the bus duct, and the bottom of the upper sealing shell and the upper surface of the lower sealing shell are attached and kept sealed; The upper sealed shell is provided with an upper chamber inside, and the upper chamber is used to store water. The lower sealed shell is provided with a lower chamber inside, and the upper and lower surfaces of the lower sealed shell are respectively provided with a rectangular groove and a drainage groove, and the rectangular groove and the drainage groove are both communicated with the interior of the lower chamber; A rubber channel is fixedly arranged on the lower surface of the upper sealing shell. The rubber channel is in a rectangular frame structure. The bottom of the rubber channel is inserted into the rectangular groove. The upper end of the rubber channel is communicated with the interior of the upper chamber.

[0006] Preferably, a temperature sensor is installed on the inner wall of the lower chamber, and a solenoid valve is provided in the drainage groove.

[0007] Preferably, a floating plate is provided in the lower chamber, and the floating plate is in a rectangular frame structure, and the inner and outer circle surfaces of the rectangular frame structure are respectively attached to the corresponding inner walls of the lower chamber, and a circular hole is provided on the floating plate. There are multiple circular holes, and the multiple circular holes are equidistantly distributed along the trajectory of the rectangular frame structure, and the circular holes penetrate the upper and lower surfaces of the floating plate at the same time.

[0008] Preferably, a water receiving hole is provided on the upper surface of the upper sealing shell, the lower end of the water receiving hole is communicated with the upper chamber, and a plurality of the water receiving holes are provided, and the plurality of water receiving holes are distributed in a rectangular array.

[0009] Preferably, a filter layer is provided inside the upper chamber, and the periphery of the filter layer is movably attached to the inner wall of the upper chamber.

[0010] Preferably, a spring is fixedly provided on the bottom surface of the upper chamber, and the upper end of the spring is fixedly connected to the bottom surface of the filter layer. A slag discharge groove is provided on the outer periphery of the upper end of the upper sealing shell, and one end of the slag discharge groove is connected to the upper chamber. The slag discharge groove is located above the filter layer.

[0011] Preferably, the filter layer has a wavy structure.

[0012] Preferably, a cover is opened and closed on the upper sealing shell.

[0013] Preferably, an electrical box is installed on the side of the lower sealed shell, and a DC battery, a controller, and a radiator are placed inside the electrical box.

[0014] Preferably, a copper plate is provided in the bus duct, and a rectangular groove for the copper plate to movably pass through is provided on the lower sealing shell.

[0015] Technical effects and advantages of the present invention: 1. The upper sealing shell and the lower sealing shell of the present invention form a waterproof structure covering the entire exterior of the bus duct and the bus duct cover, which increases the waterproof effect of the bus duct. When water flows through the rubber channel, the rubber channel is squeezed toward the inner wall of the rectangular groove due to the water pressure, thereby achieving stronger sealing and better waterproof effect. Even after the rubber channel ages, this part of the water pressure can still squeeze the rubber channel toward the inner wall of the rectangular groove, thereby maintaining a good waterproof effect. 2. The present invention is based on the upper sealing shell and the lower sealing shell being respectively spliced ​​and arranged on the corresponding bus duct cover and bus duct, and can be directly applied to the bus duct that has been used, without replacing the bus duct of a new model in order to increase the waterproof effect of the bus duct, thus saving costs and facilitating promotion; 3. In order to take into account the heat dissipation effect of the bus duct in the present invention, a lower chamber is provided inside the lower sealed shell, and water is also stored in the lower chamber. When the bus duct generates heat, this part of the heat can be absorbed by the water in the lower chamber, which has a good heat dissipation effect; 4. In the present invention, the amount of water stored in the upper chamber is relatively large, so the water in the upper chamber can be replenished to the lower chamber multiple times, achieving the purpose of continuous heat dissipation; 5. The temperature sensor of the present invention can monitor the water temperature in the lower chamber. When the monitored water temperature exceeds the set maximum threshold, the solenoid valve is controlled to open, so that the high-temperature water in the lower chamber can be automatically discharged from the drain groove, avoiding the phenomenon that the water temperature cannot be automatically discharged when it is too high, which affects the heat dissipation of the bus duct; 6. In the present invention, since the floating plate has a certain isolation effect on the upper and lower water layers, it also prevents the water added to the lower chamber from mixing with the hot water to be discharged from the original lower chamber, so that the hot water in the lower chamber can be drained cleanly, and the cold water in the upper chamber will basically not be discharged, thereby improving the utilization rate of cold water when the bus duct dissipates heat; 7. When it rains, rainwater can be replenished into the upper chamber through the water receiving hole, making full use of natural resources; 8. When the filter layer moves upward, the impurities on the surface of the filter layer can be pushed to the slag discharge groove and discharged, achieving the purpose of automatic cleaning of impurities, without manual maintenance, and low maintenance cost; 9. When the filter layer shakes, the impurity particles mixed in the gap structure on the upper surface of the filter layer can be shaken off and discharged from the slag discharge trough, which prolongs the service life of the filter layer while maintaining the filter layer's filtering effect on rainwater. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the structure of a low-voltage DC bus duct with high waterproofness according to the present invention from one perspective; Figure 2 It is a schematic structural diagram of a low-voltage DC bus duct with high waterproofness according to the present invention from another perspective; Figure 3 It is a schematic diagram of the bus duct, the upper shell and the lower shell of the present invention; Figure 4 A cross-sectional view of a low-voltage DC bus duct with high waterproofness according to the present invention; Figure 5 For the present invention Figure 4 A schematic diagram of the enlarged structure in the middle.

[0017] In the figure: 1. bus duct; 2. copper plate; 3. bus duct cover; 4. upper sealing shell; 5. lower sealing shell; 501. rectangular trough; 601. upper chamber; 602. lower chamber; 603. water receiving hole; 604. rubber channel; 605. drainage trough; 606. solenoid valve; 607. temperature sensor; 608. floating plate; 609. round hole; 610. electrical box; 611. filter layer; 612. spring; 613. slag discharge trough; 614. cover. DETAILED DESCRIPTION

[0018] 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. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] The present invention provides Figure 1 A highly waterproof low-voltage DC bus duct as shown in Figure 5 includes a bus duct 1, and a bus duct cover 3 is arranged above the bus duct 1. The bus duct 1 and the bus duct cover 3 are both existing technologies, and a copper plate 2 is arranged inside the bus duct 1, which will not be described in detail here.

[0020] In order to solve the problem that the bus duct is placed in an outdoor environment, especially exposed to rain for a long time, and its waterproof performance is weak, which will cause the inside of the bus duct to be damp, the insulation performance to be reduced, and other problems posing a threat to the safety of the power system, in the present invention, an upper sealing shell 4 is arranged on the upper surface of the bus duct cover 3, and a lower sealing shell 5 is arranged on the bottom periphery of the bus duct 1, and the bottom of the upper sealing shell 4 and the upper surface of the lower sealing shell 5 are attached to and kept sealed; the upper sealing shell 4 and the lower sealing shell 5 form a waterproof structure that covers the entire outside of the bus duct 1 and the bus duct cover 3, thereby increasing the waterproof effect of the bus duct 1.

[0021] Furthermore, the upper sealing shell 4 and the lower sealing shell 5 are respectively spliced ​​and arranged on the corresponding bus duct cover 3 and the bus duct 1. Therefore, the scope of application is wide, and it can be directly applied to the bus duct 1 that has been used. There is no need to replace the bus duct 1 with a new model in order to increase the waterproof effect of the bus duct 1, which saves costs and facilitates promotion.

[0022] Considering that the copper plate 2 in the bus duct 1 in the prior art is used to transmit large-flow current, it is easy to generate a large amount of heat, and the bus duct 1 itself needs to be sealed and cannot be provided with heat dissipation structures such as heat dissipation holes. Therefore, the heat is not easy to dissipate. Therefore, in order to take into account the heat dissipation effect of the bus duct 1 in the present invention, a lower chamber 602 is provided inside the lower sealing shell 5, and water is also stored in the lower chamber 602. When the bus duct 1 generates heat, this part of the heat can be absorbed by the water in the lower chamber 602, thereby achieving a good heat dissipation effect.

[0023] Considering the need to provide a continuous heat dissipation effect for the bus duct 1, a rectangular groove 501 and a drainage groove 605 are respectively provided on the upper and lower surfaces of the lower sealing shell 5, and the rectangular groove 501 and the drainage groove 605 are both connected to the interior of the lower chamber 602. An upper chamber 601 is provided inside the upper sealing shell 4. The upper chamber 601 is used to store water. The amount of water stored in the upper chamber 601 is relatively large. Therefore, the water in the upper chamber 601 can be replenished to the lower chamber 602 many times. When the water in the upper chamber 601 is replenished to the lower chamber 602, the drainage groove 605 can be opened to allow the water in the upper chamber 601 to flow to the lower chamber 602. When the water in the lower chamber 602 absorbs enough heat, the drainage groove 605 is opened to discharge the water with heat from the drainage groove 605, and then the water in the upper chamber 601 is continuously supplied to the lower chamber 602, thereby achieving the purpose of continuous heat dissipation.

[0024] In order to automatically determine when the water temperature in the lower chamber 602 reaches a high level and needs to be discharged, a temperature sensor 607 is installed on the inner wall of the lower chamber 602, and an electromagnetic valve 606 is provided in the drainage groove 605; the temperature sensor 607 can monitor the water temperature in the lower chamber 602. When the monitored water temperature exceeds the set maximum threshold, the electromagnetic valve 606 is controlled to open, so that the high-temperature water in the lower chamber 602 can be automatically discharged from the drainage groove 605, thereby avoiding the phenomenon that the water temperature cannot be automatically discharged when it is too high, thereby affecting the heat dissipation of the bus duct 1.

[0025] In actual use, a drainage pipe may be connected to the drainage groove 605, and the drainage pipe may drain the water in the lower chamber 602 to a fixed position for discharge.

[0026] In the present invention, an electrical box 610 is also installed on the side of the lower sealing shell 5. A DC battery, a controller, and a radiator are placed inside the electrical box 610. The DC battery is used to power the solenoid valve 606, the temperature sensor 607 and other mechanisms, and the radiator is used to dissipate heat for the electrical structure inside the electrical box 610. The DC battery, the controller, and the radiator are all existing common technologies and are not described in detail here. When working, the controller is connected between the temperature sensor 607 and the solenoid valve 606. When the temperature sensor 607 detects that the water temperature in the lower chamber 602 exceeds the set maximum threshold, the solenoid valve 606 can be controlled to open by the controller, thereby achieving the purpose of automatic control.

[0027] Because the water in the upper chamber 601 can be replenished to the lower chamber 602 multiple times, and in the prior art, if the upper chamber 601 is directly connected to the lower chamber 602, when the hot water in the lower chamber 602 is discharged, the cold water in the upper chamber 601 is replenished to the lower chamber 602 at the same time, and a part of the cold water will be mixed with the hot water, causing a part of the cold water to be directly discharged with the hot water or a part of the hot water is still not discharged. After the new cold water is replenished in the lower chamber 602, the temperature of this part of the cold water is actually greater than the temperature of the cold water in the upper chamber 601. Therefore, when the bus duct 1 is cooled, the heat dissipation efficiency is greatly reduced. In order to improve the utilization rate of cold water in heat dissipation of the bus duct 1, a floating plate 608 is provided in the lower chamber 602 in the present invention. The floating plate 608 It is a rectangular frame structure, and the inner and outer circle surfaces of the rectangular frame structure are respectively attached to the corresponding inner walls of the lower chamber 602; when the water in the lower chamber 602 is discharged to the outside through the drainage groove 605, the water level in the lower chamber 602 drops, and the water in the upper chamber 601 is replenished in the lower chamber 602 at the same time. This part of water pushes the upper surface of the floating plate 608, so that the floating plate 608 drops along the height direction of the lower chamber 602. Since the floating plate 608 has a certain isolation effect on the upper and lower water layers, it also prevents the water replenished by the upper chamber 601 to the lower chamber 602 from mixing with the hot water that is about to be discharged from the original lower chamber 602, so that the hot water in the lower chamber 602 can be drained cleanly, and the cold water in the upper chamber 601 will basically not be discharged, thereby improving the utilization rate of cold water when the bus duct 1 dissipates heat.

[0028] The floating plate 608 is provided with a circular hole 609, and there are multiple circular holes 609, which are distributed at equal distances along the trajectory of the rectangular frame structure, and the circular holes 609 penetrate the upper and lower surfaces of the floating plate 608 at the same time; when the floating plate 608 is pushed to the bottom of the lower chamber 602, since the floating plate 608 has the circular holes 609 connecting the upper and lower surfaces of the floating plate 608, the water above and below the floating plate 608 is connected to a certain extent, and the floating plate 608 can use its own buoyancy to gradually return to the top of the lower chamber 602.

[0029] It should be noted that the diameter of the circular hole 609 is relatively small. When the water in the upper chamber 601 enters the lower chamber 602 and pushes the floating plate 608 downward, only a small amount of water can enter the bottom of the floating plate 608 from the circular hole 609, thereby reducing the loss of cold water.

[0030] Considering that the bus duct 1 can be installed in two ways: indoors and outdoors; for the way of arranging the bus duct 1 indoors, a water inlet pipe can be connected to the upper sealing shell 4, and the water inlet pipe is connected to the nearest water source to replenish water into the upper chamber 601. An existing water level sensor can also be provided inside the upper chamber 601. When the water level in the upper chamber 601 drops to a certain level, water is automatically replenished into the upper chamber 601, which is practical and convenient.

[0031] In view of the situation where the bus duct 1 is arranged outdoors, a water receiving hole 603 can be provided on the upper surface of the upper sealing shell 4, and the lower end of the water receiving hole 603 is connected to the upper chamber 601. There are multiple water receiving holes 603, and the multiple water receiving holes 603 are distributed in a rectangular array. When it rains, rainwater can be replenished into the upper chamber 601 through the water receiving holes 603, making full use of natural resources. At the same time, a pipe for replenishing water into the upper chamber 601 can be provided on the upper sealing shell 4. It can be set according to actual needs and will not be elaborated here.

[0032] A rubber channel 604 is fixedly provided on the lower surface of the upper sealing shell 4. The rubber channel 604 is a rectangular frame structure. The bottom of the rubber channel 604 is inserted into the rectangular groove 501, and the upper end of the rubber channel 604 is connected to the interior of the upper chamber 601. When working, the water in the upper chamber 601 will be replenished to the lower chamber 602 through the rubber channel 604. Because it is necessary to consider the situation of water leakage to the bus duct 1, the bottom of the rubber channel 604 in the present invention is inserted into the rectangular groove 501, so that the water flowing out of the rubber channel 604 can directly flow into the lower chamber 602 without leaking into the bus duct 1.

[0033] Furthermore, when water flows through the rubber channel 604, due to the effect of water pressure, the rubber channel 604 will be squeezed toward the inner wall of the rectangular groove 501, thereby achieving stronger sealing and better waterproof effect. Even after the rubber channel 604 ages, this part of water pressure can still squeeze the rubber channel 604 toward the inner wall of the rectangular groove 501, maintaining a good waterproof effect.

[0034] In the above-mentioned case where the bus duct 1 is arranged outdoors, a water receiving hole 603 is set on the upper surface of the upper sealing shell 4, and the water receiving hole 603 is used to connect rainwater to the upper chamber 601 for replenishment. Therefore, a filter layer 611 is set inside the upper chamber 601, and the outer periphery of the filter layer 611 is movably fitted on the inner wall of the upper chamber 601. When rainwater enters the upper chamber 601, it will be filtered through the filter layer 611 to avoid impurities entering the upper chamber 601 and causing blockage and other problems.

[0035] Furthermore, a spring 612 is fixedly provided on the bottom surface of the upper chamber 601, and the upper end of the spring 612 is fixedly connected to the bottom surface of the filter layer 611. A slag discharge groove 613 is provided on the outer periphery of the upper end of the upper sealing shell 4, and one end of the slag discharge groove 613 is connected to the upper chamber 601, and the slag discharge groove 613 is located above the filter layer 611; since the impact force of rainwater is sometimes large and sometimes small, and the flow rate is unstable, when the rainwater entering the water receiving hole 603 impacts the surface of the filter layer 611, it will compress the spring 612. When the force of rainwater becomes smaller, the spring 612 is reset, forming a phenomenon that the filter layer 611 moves back and forth up and down. When the filter layer 611 moves upward, it can push and discharge impurities on the surface of the filter layer 611 to the slag discharge groove 613, thereby achieving the purpose of automatically cleaning impurities, without manual maintenance, and low maintenance cost.

[0036] Furthermore, since the impact force of rainwater changes rapidly, the filter layer 611 usually moves back and forth up and down at a relatively fast speed, that is, the filter layer 611 has a certain shaking phenomenon. When the filter layer 611 shakes, the impurity particles mixed in the void structure on the upper surface of the filter layer 611 can be shaken off and discharged from the slag discharge groove 613, thereby extending the service life of the filter layer 611 while maintaining the filtering effect of the filter layer 611 on rainwater.

[0037] In actual use, the filter layer 611 has a wavy structure, which is more conducive to the impurities on the surface of the filter layer 611 moving to the slag discharge groove 613.

[0038] It should be noted that the filter layer 611 may use a composite filter layer structure of a filter mesh, an activated carbon layer, and a filter cotton layer, which will not be described in detail here.

[0039] A cover 614 is provided on the upper sealing shell 4 in an openable manner for regular manual maintenance or overhaul.

[0040] In the present invention, a rectangular groove for the copper plate 2 to move through is provided on the lower sealing shell 5, and the rectangular groove has a wall structure, which is used to separate the water and the copper plate 2 in the lower chamber 602, and achieves the purpose of water-electricity separation. In actual use, the lower sealing shell 5 can also be set as a concave frame structure, which is more practical, and there is no need to worry about the contact between water and the copper plate 2. It can be set according to actual needs, and the principle is the same, so it will not be repeated here.

Claims

1. A low-voltage DC bus duct with high waterproofness, comprising a bus duct (1), a bus duct cover (3) being arranged above the bus duct (1), characterized in that: An upper sealing shell (4) is spliced ​​on the upper surface of the bus duct cover (3), a lower sealing shell (5) is spliced ​​on the bottom periphery of the bus duct (1), and the bottom of the upper sealing shell (4) and the upper surface of the lower sealing shell (5) are in contact with each other and remain sealed; An upper chamber (601) is provided inside the upper sealed shell (4), and the upper chamber (601) is used to store water; a lower chamber (602) is provided inside the lower sealed shell (5), and a rectangular groove (501) and a drainage groove (605) are provided on the upper and lower surfaces of the lower sealed shell (5), respectively, and the rectangular groove (501) and the drainage groove (605) are both connected to the interior of the lower chamber (602); A rubber channel (604) is fixedly provided on the lower surface of the upper sealing shell (4); the rubber channel (604) is in a rectangular frame structure; the bottom of the rubber channel (604) is inserted into the rectangular groove (501); and the upper end of the rubber channel (604) is in communication with the interior of the upper chamber (601).

2. The highly waterproof low-voltage DC bus duct according to claim 1, characterized in that: A temperature sensor (607) is installed on the inner wall of the lower chamber (602), and a solenoid valve (606) is provided in the drainage groove (605).

3. The highly waterproof low-voltage DC bus duct according to claim 1, characterized in that: A floating plate (608) is arranged in the lower chamber (602), and the floating plate (608) is in a rectangular frame structure, and the inner and outer ring surfaces of the rectangular frame structure are respectively attached to the corresponding inner walls of the lower chamber (602), and a circular hole (609) is arranged on the floating plate (608). There are a plurality of circular holes (609), and the plurality of circular holes (609) are distributed at equal distances along the trajectory of the rectangular frame structure, and the circular holes (609) simultaneously penetrate the upper and lower surfaces of the floating plate (608).

4. The highly waterproof low-voltage DC bus duct according to claim 1, characterized in that: The upper surface of the upper sealing shell (4) is provided with a water receiving hole (603), the lower end of the water receiving hole (603) is in communication with the upper chamber (601), a plurality of the water receiving holes (603) are provided, and the plurality of water receiving holes (603) are distributed in a rectangular array.

5. The highly waterproof low-voltage DC bus duct according to claim 1, characterized in that: A filter layer (611) is disposed inside the upper chamber (601), and the periphery of the filter layer (611) is movably attached to the inner wall of the upper chamber (601).

6. The highly waterproof low-voltage DC bus duct according to claim 5, characterized in that: A spring (612) is also fixedly arranged on the bottom surface of the upper chamber (601), and the upper end of the spring (612) is fixedly connected to the bottom surface of the filter layer (611). A slag discharge groove (613) is arranged on the outer periphery of the upper end of the upper sealing shell (4), and one end of the slag discharge groove (613) is connected to the upper chamber (601). The slag discharge groove (613) is located above the filter layer (611).

7. The highly waterproof low-voltage DC bus duct according to claim 5, characterized in that: The filter layer (611) has a wavy structure.

8. The highly waterproof low-voltage DC bus duct according to claim 1, characterized in that: A cover (614) is provided on the upper sealing shell (4) in an openable and closable manner.

9. The highly waterproof low-voltage DC bus duct according to claim 1, characterized in that: An electrical box (610) is installed on the side of the lower sealed shell (5), and a DC battery, a controller, and a radiator are placed inside the electrical box (610).

10. The highly waterproof low-voltage DC bus duct according to claim 1, characterized in that: A copper plate (2) is arranged in the bus duct (1), and a rectangular groove for the copper plate (2) to movably pass through is arranged on the lower sealing shell (5).

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