Radiation-proof high-low temperature vacuum motor

Abstract

The utility model discloses an anti-radiation high and low temperature vacuum motor, and particularly relates to the field of high and low temperature vacuum motors, the anti-radiation high and low temperature vacuum motor comprises a high and low temperature vacuum motor shell, a stator, a rotor and a rotating shaft, the stator is installed on the side wall of the inner cavity of the high and low temperature vacuum motor shell, and the rotating shaft is transversely arranged at the center of the inner cavity of the high and low temperature vacuum motor shell. A rotor is arranged on the outer diameter surface of the rotating shaft, a bearing is arranged on the contact face of the rotating shaft and the high-low temperature vacuum motor shell, and a sealing assembly is arranged on one side of the bearing. A high-low temperature vacuum motor is generally applied to fields with extremely strict environmental requirements, such as space flight and aviation and nuclear industry. Through the radiation-resistant ceramic layer, the lead-boron polyethylene plate, the nickel-based alloy layer and the modified phenolic aldehyde amine epoxy anticorrosive coating in the radiation-resistant layer in the high-low temperature vacuum motor shell, the effects of preventing the internal structure of the motor from being damaged and preventing the performance from being reduced and even losing efficacy are achieved, and through the structure, high-energy particles and radiation are prevented from penetrating through the motor shell to damage the interior of the motor. And the effect of preventing radiation is effectively achieved.

Description

Technical Field

[0001] The utility model relates to the field of high and low temperature vacuum motors, and more specifically, the utility model relates to a high and low temperature vacuum motor with radiation protection. Background Art

[0002] A high and low temperature vacuum motor is a motor that can operate stably within a wide temperature range (usually from extremely low temperatures to extremely high temperatures) and in a vacuum environment. Such motors usually have special designs to adapt to extreme working conditions, such as the use of high and low temperature resistant materials, special lubrication and sealing technologies, and a structural design that can maintain performance in a vacuum environment. High and low temperature vacuum motors can be applied to fields such as spacecraft manufacturing, ground simulation equipment for aerospace equipment, biomedicine, and automated equipment in extreme natural environments;

[0003] For example, the patent application No. CN202320467223.3 provides a high and low temperature vacuum motor with radiation protection. Through the radiation protection layer, it can effectively prevent the radiation from spreading out during the use of the vacuum motor. The low temperature gas is introduced into the vacuum motor through the low temperature inlet pipe. The low temperature gas spirally cools in the vacuum motor. During the process of cooling the vacuum motor, the temperature of the low temperature gas itself will gradually rise. After circulating the cooling of the vacuum motor once, the heated gas is discharged through the high temperature exhaust pipe, thus realizing the function of circulating cooling the vacuum motor with low temperature cold air; the above device mainly uses the radiation protection layer to effectively prevent the radiation from spreading out during the use of the vacuum motor, and similarly can prevent the radiation from being transported inward. However, high and low temperature vacuum motors are usually applied to fields with extremely strict environmental requirements, such as aerospace and nuclear industry. In these environments, the motor may be exposed to high-energy particles and radiation, which can penetrate traditional motor materials, resulting in damage to the internal structure, performance degradation, or even failure. The radiation protection layer in the above device is made by pressing a metal fiber radiation protection blended fabric, and the design and development of the metal fiber blended fabric are mainly for electromagnetic radiation. In an environment of high-energy particles and radiation, its protection effect may not be sufficient to provide adequate protection. Therefore, the above device cannot effectively prevent radiation.

[0004] Therefore, a high and low temperature vacuum motor with radiation protection is proposed to solve the above problems. Summary of the Utility Model

[0005] In order to overcome the above-mentioned defects of the prior art, the utility model provides a high and low temperature vacuum motor with radiation protection to solve the problems raised in the above background art.

[0006] To achieve the above object, the present utility model provides the following technical solution: A high and low temperature vacuum motor with radiation protection, comprising a high and low temperature vacuum motor housing, a stator, a rotor and a rotating shaft. The stator is installed on the side wall of the inner cavity of the high and low temperature vacuum motor housing. A rotating shaft is horizontally arranged at the center of the inner cavity of the high and low temperature vacuum motor housing, and a rotor is arranged on the outer diameter surface of the rotating shaft. A rear shaft cover is arranged on one side of the high and low temperature vacuum motor housing. A commutator is arranged on the outer diameter surface of the rotating shaft. A bearing is arranged at the contact surface between the rotating shaft and the high and low temperature vacuum motor housing, and a sealing assembly is arranged on one side of the bearing. A magnetic coil is installed around the outer diameter surface of the rotor;

[0007] The high and low temperature vacuum motor housing is composed of an installation layer, a heat dissipation layer and a radiation protection layer. The heat dissipation layer is installed inside the radiation protection layer, and an installation layer is arranged on the side of the heat dissipation layer away from the radiation protection layer. The heat dissipation layer is composed of two groups of arc-shaped copper heat dissipation plates, and the two groups of copper heat dissipation plates are combined into a circular shape. One end of the copper heat dissipation plate in the heat dissipation layer longitudinally penetrates and extends above the radiation protection layer to be connected with an auxiliary heat dissipation mechanism. The radiation protection layer includes a radiation-resistant ceramic layer, a lead borated polyethylene board, a nickel-based alloy layer and a modified phenolic amine epoxy anti-corrosion coating. The lead borated polyethylene board is installed inside the radiation-resistant ceramic layer, the nickel-based alloy layer is installed inside the lead borated polyethylene board, and the modified phenolic amine epoxy anti-corrosion coating is sprayed on the outer diameter surface of the radiation-resistant ceramic layer.

[0008] Preferably, a radiation protection shell is arranged on one side of the high and low temperature vacuum motor housing, and the radiation protection materials between the radiation protection shell and the radiation protection layer are set to be compatible. The radiation protection materials between the rear shaft cover and the radiation protection layer are set to be compatible.

[0009] Preferably, the auxiliary heat dissipation mechanism includes a housing and ventilation openings. The housing is installed on the outer diameter surface of the high and low temperature vacuum motor housing, and ventilation openings are arranged through the side wall and the upper end surface of the housing. A heat conduction plate is arranged in the inner cavity of the housing, and a fan is arranged on the top end surface of the inner cavity of the housing.

[0010] Preferably, the sealing assembly includes a Ste gland, a Gr seal, a Y-shaped sealing ring and a labyrinth sealing cover. There are two groups of Gr seals and Y-shaped sealing rings. The two groups of Gr seals are located between the two groups of Y-shaped sealing rings. A Ste gland is arranged between the two groups of Gr seals, and a labyrinth sealing cover is arranged on one side of the Y-shaped sealing ring. The sealing assembly is installed on the outer diameter surface of the rotating shaft.

[0011] Preferably, the rotating shaft and the high and low temperature vacuum motor housing form a rotating structure that rotates around the center of the bearing through the bearing. A controller is arranged in the inner cavity of the rear shaft cover, and the controller is electrically connected to the fan, the commutator and the magnetic coil through wires.

[0012] Preferably, the housing is bolt - limitedly connected to the outer diameter surface of the high - low temperature vacuum motor housing through bolts, and the upper end surface of the end of the copper heat - dissipation plate in the heat - dissipation layer that longitudinally penetrates and extends above the radiation - proof layer is closely arranged.

[0013] The technical effects and advantages of the present utility model:

[0014] Compared with the prior art, when the high - low temperature vacuum motor with radiation protection is in use, since the high - low temperature vacuum motor is usually applied to fields with extremely strict environmental requirements, such as aerospace and nuclear industry, the radiation - resistant ceramic layer, lead - borated polyethylene board, nickel - based alloy layer and modified phenolic amine epoxy anticorrosive coating in the radiation - proof layer of the high - low temperature vacuum motor housing can prevent the internal structure of the motor from being damaged, its performance from declining, or even failing. Through the above - mentioned structure, high - energy particles and radiation are prevented from passing through the motor housing to damage the inside of the motor, thus effectively achieving the effect of radiation prevention.

[0015] Compared with the prior art, when the high - low temperature vacuum motor with radiation protection is in use, the high - low temperature vacuum motor housing plays the role of heat dissipation and radiation prevention. Since the heat - dissipation layer is composed of two groups of arc - shaped copper heat - dissipation plates, and the two groups of copper heat - dissipation plates are combined into a circle, one end of the copper heat - dissipation plate in the heat - dissipation layer longitudinally penetrates and extends above the radiation - proof layer. The heat generated in the inner cavity of the high - low temperature vacuum motor housing is transmitted out through the arc - shaped copper heat - dissipation plate, and the heat is timely dissipated through the auxiliary heat - dissipation mechanism. At the same time, the rear axle cover is further used to dissipate heat. And since the heat - conducting plate is closely arranged on the upper end surface of the end of the copper heat - dissipation plate in the heat - dissipation layer that longitudinally penetrates and extends above the radiation - proof layer, when the fan is started, the heat of the heat - conducting plate is taken out through the ventilation port, thus dissipating the heat of the heat - conducting plate. Also, because the copper heat - dissipation plate is closely arranged with the heat - conducting plate, heat transfer occurs, so as to dissipate the heat of the copper heat - dissipation plate, thereby dissipating the heat of the high - low temperature vacuum motor housing. And the radiation - proof material between the housing and the radiation - proof layer is set to be adaptable, so as to prevent radiation from affecting the work of the auxiliary heat - dissipation mechanism. Through the above - mentioned structure, the high - low temperature vacuum motor housing can be effectively cooled.

[0016] Compared with the prior art, when the high - low temperature vacuum motor with radiation protection is in use, radiation prevention is carried out through the radiation - proof layer. Among them, the radiation - resistant ceramic layer in the radiation - proof layer can maintain good structural stability under the radiation of high - energy particles and gamma rays. The lead - borated polyethylene board can effectively shield alpha, beta, gamma, X - rays and neutron radiation. And the nickel - based alloy layer is installed inside the lead - borated polyethylene board, so as to be used for fixedly installing the stator, rotor, rotating shaft, rear axle cover, commutator, sealing component, magnetic coil and radiation - proof shell. At the same time, the radiation - proof materials between the radiation - proof shell and the rear axle cover and the radiation - proof layer are set to be adaptable, thus preventing radiation from diffusing into the inside of the high - low temperature vacuum motor housing along the gaps of the high - low temperature vacuum motor housing. Brief Description of the Drawings

[0017] Figure 1 This is a schematic diagram of the front cross-sectional structure of the present utility model.

[0018] Figure 2 This is a schematic diagram of the side cross-sectional structure of the high and low temperature vacuum motor housing of the present utility model.

[0019] Figure 3 This is a schematic diagram of the cross-sectional structure of the high and low temperature vacuum motor housing of the present utility model.

[0020] Figure 4 This is a schematic diagram of the front cross-sectional structure of the sealing assembly of the present utility model.

[0021] Figure 5 This is a schematic diagram of the three-dimensional structure of the high and low temperature vacuum motor housing of the present utility model.

[0022] The reference numerals in the drawings are: 1. High and low temperature vacuum motor housing; 101. Installation layer; 102. Heat dissipation layer; 103. Radiation protection layer; 1031. Radiation-resistant ceramic layer; 1032. Lead borate polyethylene board; 1033. Nickel-based alloy layer; 1034. Modified phenolic amine epoxy anti-corrosion coating; 104. Auxiliary heat dissipation mechanism; 1041. Housing; 1042. Vent; 1043. Heat conduction plate; 1044. Fan; 2. Stator; 3. Rotor; 4. Rotating shaft; 5. Rear end cover; 6. Commutator; 7. Sealing assembly; 71. Straton; 72. Grilon; 73. Y-shaped sealing ring; 74. Labyrinth seal cover; 8. Magnetic coil; 9. Radiation protection shell. Detailed Description of the Preferred Embodiment

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model. Embodiment 1

[0024] As shown in the attached Figures 1 to 3 A radiation-proof high and low temperature vacuum motor includes a high and low temperature vacuum motor housing 1, a stator 2, a rotor 3, and a rotating shaft 4. The stator 2 is installed on the side wall of the inner cavity of the high and low temperature vacuum motor housing 1. A rotating shaft 4 is horizontally arranged at the center of the inner cavity of the high and low temperature vacuum motor housing 1, and a rotor 3 is arranged on the outer diameter surface of the rotating shaft 4. A rear end cover 5 is arranged on one side of the high and low temperature vacuum motor housing 1. A commutator 6 is arranged on the outer diameter surface of the rotating shaft 4. A bearing is arranged on the contact surface between the rotating shaft 4 and the high and low temperature vacuum motor housing 1, and a sealing assembly 7 is arranged on one side of the bearing. A magnetic coil 8 is arranged around the outer diameter surface of the rotor 3;

[0025] The high and low temperature vacuum motor housing 1 is composed of an installation layer 101, a heat dissipation layer 102 and a radiation protection layer 103. The heat dissipation layer 102 is installed inside the radiation protection layer 103, and the installation layer 101 is arranged on the side of the heat dissipation layer 102 away from the radiation protection layer 103. The heat dissipation layer 102 is composed of two groups of arc-shaped copper heat dissipation plates, and the two groups of copper heat dissipation plates are combined into a circle. One end of the copper heat dissipation plate in the heat dissipation layer 102 longitudinally penetrates and extends above the radiation protection layer 103 and is connected with an auxiliary heat dissipation mechanism 104. The radiation protection layer 103 includes a radiation-resistant ceramic layer 1031, a lead borate polyethylene board 1032, a nickel-based alloy layer 1033 and a modified phenolic amine epoxy anti-corrosion coating 1034. The lead borate polyethylene board 1032 is installed inside the radiation-resistant ceramic layer 1031, the nickel-based alloy layer 1033 is installed inside the lead borate polyethylene board 1032, and the modified phenolic amine epoxy anti-corrosion coating 1034 is sprayed on the outer diameter surface of the radiation-resistant ceramic layer 1031.

[0026] Among them: Since high and low temperature vacuum motors are usually applied to fields with extremely strict environmental requirements, such as aerospace and nuclear industry, the radiation-resistant ceramic layer 1031, lead borate polyethylene board 1032, nickel-based alloy layer 1033 and modified phenolic amine epoxy anti-corrosion coating 1034 in the radiation protection layer 103 of the high and low temperature vacuum motor housing 1 play the role of preventing damage to the internal structure of the motor, performance degradation, and even failure, avoiding high-energy particles and radiation from penetrating the motor housing and damaging the inside of the motor, and effectively playing the role of preventing radiation. Among them, the radiation protection layer 103 is used for radiation protection. The radiation-resistant ceramic layer 1031 in the radiation protection layer 103 can maintain good structural stability under the radiation of high-energy particles and γ rays. The lead borate polyethylene board 1032 can effectively shield α, β, γ, X rays and neutron radiation. And the nickel-based alloy layer 1033 is installed inside the lead borate polyethylene board 1032 for fixing and installing the stator 2, rotor 3, shaft 4, rear end cover 5, commutator 6, sealing component 7, magnetic coil 8 and radiation protection shell 9. At the same time, the radiation protection materials between the radiation protection shell 9 and the rear end cover 5 and the radiation protection layer 103 are set to be compatible to avoid radiation from diffusing into the inside of the high and low temperature vacuum motor housing 1 along the gaps of the high and low temperature vacuum motor housing 1. Embodiment 2

[0027] On the basis of Embodiment 1, the solution in Embodiment 1 is further refined and introduced in combination with the following specific working methods, such as Figures 1 to 5 shown, see the following description for details:

[0028] As a preferred implementation method, a radiation protection shell 9 is arranged on one side of the high and low temperature vacuum motor housing 1, and the radiation protection materials between the radiation protection shell 9 and the radiation protection layer 103 are set to be compatible, and the radiation protection materials between the rear end cover 5 and the radiation protection layer 103 are set to be compatible.

[0029] As a preferred embodiment, the auxiliary heat dissipation mechanism 104 includes a shell 1041 and a vent 1042, the shell 1041 is installed on the outer diameter surface of the high and low temperature vacuum motor shell 1, and the side wall and the upper end surface of the shell 1041 are penetrated with the vent 1042, the inner cavity of the shell 1041 is provided with a heat conducting plate 1043, and the top end surface of the inner cavity of the shell 1041 is provided with a fan 1044, wherein the high and low temperature vacuum motor shell 1 is utilized to achieve the effects of heat dissipation and radiation protection, wherein the heat dissipation layer 102 is composed of two groups of arc-shaped copper heat dissipation plates, and the two groups of copper heat dissipation plates are combined in a circular shape, one end of the copper heat dissipation plate in the heat dissipation layer 102 is longitudinally penetrated and extended to the top of the radiation protection layer 103, and the heat generated in the inner cavity of the high and low temperature vacuum motor shell 1 is transmitted through the arc-shaped copper heat dissipation plate, and the auxiliary The heat dissipation mechanism 104 dissipates the heat, and further dissipates the heat through the rear axle cover 5. Since the heat conducting plate 1043 is closely attached to the upper end surface of the copper heat dissipation plate in the heat dissipation layer 102, which extends longitudinally to the end above the radiation protection layer 103, the fan 1044 is started, and the fan 1044 brings the heat of the heat conducting plate 1043 out through the vent 1042 to dissipate the heat of the heat conducting plate 1043. Since the copper heat dissipation plate and the heat conducting plate 1043 are closely attached, heat transfer is performed to dissipate the heat of the copper heat dissipation plate and the high and low temperature vacuum motor housing 1. The radiation protection material between the housing 1041 and the radiation protection layer 103 is matched to prevent radiation from affecting the operation of the auxiliary heat dissipation mechanism 104. The above structure can effectively dissipate the heat of the high and low temperature vacuum motor housing 1.

[0030] As a preferred embodiment, the sealing assembly 7 includes a step seal 71, a grid ring 72, a Y-type sealing ring 73 and a labyrinth sealing cover 74. The grid ring 72 and the Y-type sealing ring 73 are each provided in two groups. The two groups of grid rings 72 are located between the two groups of Y-type sealing rings 73. The step seal 71 is provided between the two groups of grid rings 72, and a labyrinth sealing cover 74 is provided on one side of the Y-type sealing ring 73. The sealing assembly 7 is installed on the outer diameter surface of the rotating shaft 4.

[0031] As a preferred embodiment, the rotating shaft 4 forms a rotating structure that rotates around the center of the bearing through the high and low temperature vacuum motor housing 1. The inner cavity of the rear axle cover 5 is provided with a controller, and the controller is electrically connected to the fan 1044, the commutator 6 and the magnetic coil 8 through wires.

[0032] As a preferred embodiment, the shell 1041 is bolted to the outer diameter surface of the high and low temperature vacuum motor shell 1 by bolts, and the heat conducting plate 1043 is tightly arranged on the upper end surface of the red copper heat sink in the heat dissipation layer 102 that extends longitudinally to the end above the radiation protection layer 103.

[0033] The working process of the present utility model is as follows: The radiation-resistant ceramic layer 1031, lead borated polyethylene board 1032, nickel-based alloy layer 1033, and modified phenolic amine epoxy anti-corrosion coating 1034 in the radiation protection layer 103 of the high and low temperature vacuum motor housing 1 are used to prevent damage to the internal structure of the motor, performance degradation, and even failure, avoiding high-energy particles and radiation from penetrating the motor housing and damaging the interior of the motor, effectively achieving the effect of preventing radiation. The radiation protection layer 103 is used for radiation protection. The radiation-resistant ceramic layer 1031 in the radiation protection layer 103 can maintain good structural stability under the radiation of high-energy particles and gamma rays. The lead borated polyethylene board 1032 can effectively shield alpha, beta, gamma, X-rays, and neutron radiation. The nickel-based alloy layer 1033 is installed inside the lead borated polyethylene board 1032 to be used for fixedly installing the stator 2, rotor 3, rotating shaft 4, rear axle cover 5, commutator 6, sealing assembly 7, magnetic coil 8, and radiation protection shell 9. At the same time, the radiation protection materials between the radiation protection shell 9 and the rear axle cover 5 and the radiation protection layer 103 are set to be adapted to avoid radiation from diffusing into the interior of the high and low temperature vacuum motor housing 1 along the gaps of the high and low temperature vacuum motor housing 1.

[0034] Finally: The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A high and low temperature vacuum motor with radiation protection, comprising a high and low temperature vacuum motor housing (1), a stator (2), a rotor (3) and a rotating shaft (4), characterized in that: The stator (2) is installed on the side wall of the inner cavity of the high and low temperature vacuum motor housing (1). A rotating shaft (4) is horizontally arranged at the center of the inner cavity of the high and low temperature vacuum motor housing (1), and a rotor (3) is arranged on the outer diameter surface of the rotating shaft (4). A rear shaft cover (5) is arranged on one side of the high and low temperature vacuum motor housing (1). A commutator (6) is arranged on the outer diameter surface of the rotating shaft (4). A bearing is arranged on the contact surface between the rotating shaft (4) and the high and low temperature vacuum motor housing (1), and a sealing assembly (7) is arranged on one side of the bearing. A magnetic coil (8) is installed around the outer diameter surface of the rotor (3); The high and low temperature vacuum motor housing (1) is composed of an installation layer (101), a heat dissipation layer (102) and a radiation protection layer (103). The heat dissipation layer (102) is installed inside the radiation protection layer (103), and the installation layer (101) is arranged on the side of the heat dissipation layer (102) away from the radiation protection layer (103). The heat dissipation layer (102) is composed of two groups of arc-shaped copper heat dissipation plates, and the two groups of copper heat dissipation plates are combined into a circular shape. One end of the copper heat dissipation plate in the heat dissipation layer (102) longitudinally penetrates and extends above the radiation protection layer (103) and is connected with an auxiliary heat dissipation mechanism (104). The radiation protection layer (103) includes a radiation-resistant ceramic layer (1031), a lead borate polyethylene board (1032), a nickel-based alloy layer (1033) and a modified phenolic amine epoxy anti-corrosion coating (1034). The lead borate polyethylene board (1032) is installed inside the radiation-resistant ceramic layer (1031). The nickel-based alloy layer (1033) is installed inside the lead borate polyethylene board (1032). The modified phenolic amine epoxy anti-corrosion coating (1034) is sprayed on the outer diameter surface of the radiation-resistant ceramic layer (1031).

2. The anti-radiation high and low temperature vacuum motor according to claim 1, characterized in that: A radiation protection shell (9) is arranged on one side of the high and low temperature vacuum motor housing (1), and the radiation protection materials between the radiation protection shell (9) and the radiation protection layer (103) are set to be compatible. The radiation protection materials between the rear shaft cover (5) and the radiation protection layer (103) are set to be compatible.

3. The high and low temperature vacuum motor with radiation protection according to claim 1, characterized in that: The auxiliary heat dissipation mechanism (104) includes a housing (1041) and a ventilation port (1042). The housing (1041) is installed on the outer diameter surface of the high and low temperature vacuum motor housing (1), and the side wall and the upper end surface of the housing (1041) are penetrated with ventilation ports (1042). A heat conduction plate (1043) is arranged in the inner cavity of the housing (1041). A fan (1044) is arranged on the top end surface of the inner cavity of the housing (1041).

4. A high and low temperature vacuum motor with radiation protection according to claim 1, characterized in that: The sealing assembly (7) includes a sterling seal (71), a grilon seal (72), a Y-shaped sealing ring (73) and a labyrinth seal cover (74). There are two groups of grilon seals (72) and Y-shaped sealing rings (73). The two groups of grilon seals (72) are located between the two groups of Y-shaped sealing rings (73). A sterling seal (71) is arranged between the two groups of grilon seals (72), and a labyrinth seal cover (74) is arranged on one side of the Y-shaped sealing ring (73). The sealing assembly (7) is installed on the outer diameter surface of the rotating shaft (4).

5. A high and low temperature vacuum motor with radiation protection according to claim 3, characterized in that: The rotating shaft (4) forms a rotating structure that rotates around the center of the bearing with the high and low temperature vacuum motor housing (1) through the bearing. A controller is arranged in the inner cavity of the rear shaft cover (5), and the controller is electrically connected to the fan (1044), the commutator (6), and the magnetic coil (8) through wires.

6. A high and low temperature vacuum motor with radiation protection according to claim 3, characterized in that: The housing (1041) is bolt - limitedly connected to the outer diameter surface of the high and low temperature vacuum motor housing (1) through bolts. The heat conduction plate (1043) is closely arranged on the upper end surface of the end of the copper heat dissipation plate in the heat dissipation layer (102) that longitudinally extends above the radiation - proof layer (103).

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