A sealing structure for a penetration piece of an irradiation device

Abstract

The present invention discloses a sealing structure for a penetration piece of an irradiation device, and relates to the technical field of research reactor irradiation test. It mainly includes a connecting seat and a connecting pipe, wherein the connecting seat has a first channel for the penetration piece to be inserted movably; one end of the connecting pipe is interconnected with the first channel, and the other end of the connecting pipe is provided with a sealing joint; the sealing joint includes a locking sleeve, a connecting sleeve and a sealing sleeve, and the sealing sleeve includes an elastic inner ring component and an elastic outer ring component nested inside and outside, and a second channel connected to the first channel is formed between the elastic inner ring component and the elastic outer ring component; the locking sleeve can act on the elastic inner ring component and / or the elastic outer ring component, so that the elastic outer ring component and the elastic inner ring component jointly clamp the sealing penetration piece. The sealing structure clamps and seals the penetration piece by means of a movable locking seal through the sealing joint, which is not only reliable in sealing, but also convenient in disassembly and assembly of the sealing part, and has the characteristics of miniaturization of structure and convenient operation.

Description

Technical Field

[0001] The invention relates to the technical field of research reactor irradiation testing, and in particular to a sealing structure for a penetration piece of an irradiation device. Background Art

[0002] As the absolute carrier for irradiation testing of nuclear materials and nuclear fuels, the irradiation device plays an indescribable role in irradiation technology research and irradiation testing. The advancement of irradiation technology is mainly judged by whether the existing irradiation device can meet the needs of irradiation testing for more and more accurate parameters. In order to obtain more irradiation parameters of nuclear materials and nuclear fuels during irradiation testing, promote the process of irradiation device instrumentation, and as the degree of instrumentation of irradiation devices continues to increase, the number of penetrations loaded on irradiation devices continues to increase. Even in harsh environments, the penetrations and penetration sealing devices of irradiation devices need to meet the environmental requirements of high temperature and high pressure. In order to effectively prevent the leakage of radioactive materials and ensure environmental safety during the operation of nuclear power plants, the penetrations of irradiation devices must have good sealing performance.

[0003] There are generally three types of penetration sealing methods: direct welding, mechanical sealing, and a combination of welding and mechanical sealing. Direct welding has high requirements for welding. Electrodeless argon arc welding can easily damage penetrations, and laser welding does not penetrate enough to meet the requirements of high-pressure working conditions. Mechanical sealing mainly relies on the assistance of supporting components such as sealing rings. In a radiation environment, the life of supporting components such as sealing rings is limited, making it difficult to meet the requirements of long-term irradiation tests. The combination of welding and mechanical sealing will make the penetration sealing structure complex and uncompact, which not only leads to a large workload for assembly and testing, but also cannot be installed on nuclear fuel and nuclear material irradiation devices due to its complicated structure and large size.

[0004] In view of the fact that the seals of penetrations on irradiation devices are mainly the above-mentioned direct welding type, mechanical seals, and the combination of welding and mechanical seals, all of the above methods have certain defects, such as easy damage to the instrument during welding, serious wear of mechanical seal parts, low reliability, and inability to be reused, and the mechanical seal type and the combination of welding and mechanical seals have defects such as high welding difficulty, complex mechanical structure, and large appearance of the sealing device. Therefore, it is necessary to design a set of simple and easy-to-operate sealing structures that can not only ensure the reliability of the penetration seal, but also facilitate the replacement of the seal. Summary of the invention

[0005] The purpose of the present invention is to provide a sealing structure for a penetration piece of an irradiation device, which clamps and seals the penetration piece by means of a sealing joint using a movable locking seal. Not only is the seal reliable, but the sealing part is also easy to disassemble and assemble. At the same time, it has the characteristics of miniaturized structure and convenient operation.

[0006] The embodiment of the present invention is achieved as follows:

[0007] A sealing structure for a penetration piece of an irradiation device comprises a connecting seat and a connecting tube, wherein the connecting seat has a connecting portion connected to the irradiation device, and the connecting seat has a first channel for the penetration piece to be movably inserted; one end of the connecting tube is connected to the first channel and communicates with each other so that the penetration piece can be inserted into the first channel, and a sealing joint is arranged at the other end of the connecting tube; wherein the sealing joint comprises a locking sleeve, a connecting outer sleeve and a sealing sleeve arranged in the inner hole of the connecting outer sleeve, wherein the sealing sleeve comprises an elastic inner ring component and an elastic outer ring component nested inside and outside, wherein at least one group of second channels for sealingly clamping the penetration piece is formed between the elastic inner ring component and the elastic outer ring component, and the second channel is communicated with the first channel; the inner hole of the connecting outer sleeve comprises a tapered section, wherein the elastic outer ring component forms a taper fit with the tapered section, and the locking sleeve can act on the elastic inner ring component and / or the elastic outer ring component so that after the elastic outer ring component is squeezed by the tapered section, it clamps the sealing penetration piece together with the elastic inner ring component.

[0008] In a possible embodiment, the elastic inner ring assembly includes a sealing gasket inner ring and a shielding gasket inner ring, the elastic outer ring assembly includes a sealing gasket outer ring and a shielding gasket outer ring, the sealing gasket inner ring is sleeved in the inner hole of the sealing gasket outer ring, and a channel serving as at least a part of the second channel is formed between the sealing gasket inner ring and the sealing gasket outer ring; the shielding gasket inner ring is sleeved in the inner hole of the shielding gasket outer ring, and a channel serving as another part of the second channel is formed between the shielding gasket inner ring and the shielding gasket outer ring; the shielding gasket outer ring is located on the side of the sealing gasket outer ring close to the first channel, the shielding gasket outer ring and the sealing gasket outer ring are elastic, and the shielding gasket outer ring and the sealing gasket outer ring both form a taper fit with the tapered section; the locking sleeve is used to act on the sealing gasket inner ring and / or the sealing gasket outer ring.

[0009] In a possible embodiment, the inner ring of the shielding gasket and the inner ring of the sealing gasket are elastic, the inner hole wall of the outer ring of the shielding gasket is provided with a first groove distributed along the axial direction, the outer ring wall of the inner ring of the shielding gasket is provided with a second groove distributed along the axial direction, and the first groove and the second groove are spliced ​​together to form a channel serving as the other part of the second channel; the inner hole wall of the outer ring of the sealing gasket is provided with a third groove distributed along the axial direction, the outer ring wall of the inner ring of the sealing gasket is provided with a fourth groove distributed along the axial direction, and the third groove and the fourth groove are spliced ​​together to form a channel serving as at least a part of the second channel.

[0010] In a possible implementation manner, the number of the second channels is at least three groups.

[0011] In a possible implementation manner, the outer ring of the shielding pad and the inner ring of the shielding pad are made of silicone rubber, flexible graphite and carbonized fiber that have been irradiated in the pile.

[0012] In a possible implementation, the tapering angle of the tapered section ranges from 10° to 20°.

[0013] In a possible embodiment, the locking sleeve includes a locking nut and a pressure cover assembly, the locking nut and the end of the connecting sleeve away from the first channel cooperate with each other through threads, the pressure cover assembly is arranged in the inner hole of the locking nut, and the pressure cover assembly has a third channel for connecting with the second channel, when the locking nut is screwed in relative to the connecting sleeve, it can drive the pressure cover assembly to act on the elastic inner ring assembly and / or the elastic outer ring assembly.

[0014] In a possible embodiment, the gland assembly includes a gland inner ring and a gland outer ring which are nested inside and outside, and a third channel is formed between the gland inner ring and the gland outer ring; the locking nut has an acting portion that contacts the gland outer ring so that at least one of the gland outer ring and the gland inner ring acts on the elastic inner ring assembly and / or the elastic outer ring assembly.

[0015] In a possible implementation manner, the outer ring of the gland is provided with a positioning ear, and the end of the connecting sleeve is provided with a positioning notch for snap-fitting with the connecting ear.

[0016] In a possible embodiment, the outer ring of the gland includes a coaxially formed large diameter section and a small diameter section, the large diameter section is located on the side of the small diameter section away from the first channel, the diameter of the large diameter section is larger than the diameter of the end of the connecting sleeve, and the diameter of the small diameter section is smaller than the diameter of the end of the connecting sleeve, so that the small diameter section can smoothly enter the inner hole of the connecting sleeve.

[0017] The beneficial effects of the embodiments of the present invention are:

[0018] The sealing structure for the penetration piece of the irradiation device provided by the embodiment of the present invention can be directly connected to the irradiation device by setting a connecting seat and a connecting pipe, so as to facilitate the routing of the penetration piece along the connecting seat and the connecting pipe. At the same time, by setting a sealing joint, the sealing joint includes an elastic inner ring component and the elastic outer ring component that can clamp the penetration piece. Under the action of the locking sleeve and the restriction of the connecting sleeve, the elastic outer ring component and the elastic inner ring component can be close to each other and seal and clamp the penetration piece. In this way, the characteristics of reliable sealing and simple operation are met. At the same time, the entire sealing structure can achieve the advantages of being small, compact and easy to disassemble and assemble. Compared with the current three sealing methods, it not only does not cause damage to the instrument, but can be reused, and has a relatively simple structure, which is also convenient for disassembly and replacement of the sealing sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 A schematic diagram of the overall structure of a sealing structure provided by an embodiment of the present invention;

[0021] Figure 2 A schematic cross-sectional structure diagram of a sealing joint provided in an embodiment of the present invention;

[0022] Figure 3 A schematic diagram of the structure of a connecting jacket provided in an embodiment of the present invention;

[0023] Figure 4 A schematic diagram of the structure of the outer ring of the sealing gasket provided in an embodiment of the present invention;

[0024] Figure 5 A schematic diagram of the structure of the inner ring of the sealing gasket provided in an embodiment of the present invention;

[0025] Figure 6 A schematic structural diagram of a gland assembly provided in an embodiment of the present invention.

[0026] Icons: 1-connecting seat; 2-connecting pipe; 3-sealing joint; 11-base; 12-screw; 31-locking sleeve; 32-connecting outer sleeve; 33-sealing sleeve; 311-locking nut; 312-outer ring of pressure cover; 313-inner ring of pressure cover; 314-third channel; 315-positioning ear; 321-conical section; 322-positioning notch; 331-outer ring of sealing gasket; 332-inner ring of sealing gasket; 333-outer ring of shielding gasket; 334-inner ring of shielding gasket; 335-third groove; 336-fourth groove. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0031] In addition, the terms "parallel", "vertical", etc. do not mean that the components must be absolutely parallel or vertical, but can be slightly tilted. For example, "parallel" only means that its direction is more parallel than "vertical", and does not mean that the structure must be completely parallel, but can be slightly tilted.

[0032] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] Example

[0034] See also Figure 1 The present embodiment provides a sealing structure for a penetration piece of an irradiation device, which mainly includes a connection seat 1 and a connection pipe 2. The connection seat 1 has a connection portion connected to the irradiation device, that is, the connection portion is used to connect to the irradiation device, and the connection method is mainly a detachable fixed connection or a welded fixed connection, which is selected according to the specific scene requirements. The connection seat 1 has a first channel for the penetration piece to be inserted movably, that is, the first channel is used as an insertion channel of the penetration piece, so as to facilitate the routing of the penetration piece. In the present embodiment, the connecting base 1 includes a coaxially arranged base 11 and a collar 12. The base 11 is used to be welded to the flange of the irradiation device. The penetrating piece (such as a wire) of the irradiation device is led from the flange to the inner hole of the base 11. The collar 12 is detachably seated in the inner hole of the base 11, and all the rat holes on the collar 12 are connected to the inner hole of the base 11, thereby forming the first channel together. In different embodiments, the number of rat holes of the collar 12 is set according to different needs. For example, three groups of rat holes are set (an air inlet and outlet hole is opened in the middle of the collar, and the three groups of rat holes are distributed around the circumference of the air hole), so as to facilitate more penetrating pieces to seal the wiring.

[0035] One end of the connecting pipe 2 is connected to the first channel and interconnected, so that the through-piece can be inserted into the first channel, specifically, it can be sealed and plugged with the mouse hole of the mouse dragon 12. The number of connecting pipes 2 is consistent with the number of mouse holes, which can be adjusted according to the actual scene requirements, so that different through-pieces can be respectively inserted into different connecting pipes 2. The connecting pipe 2 can be in the form of a straight pipe or a curved pipe, which is mainly used to provide a routing channel for the through-piece. A sealing joint 3 is provided at the other end of the connecting pipe 2. The sealing joint 3 is mainly used to achieve a sealed connection after the through-piece is routed, and may have the advantages of convenient operation and reliable sealing.

[0036] Specifically, see Figure 2 , the sealing joint 3 comprises a locking sleeve 31, a connecting sleeve 32 and a sealing sleeve 33 arranged in the inner hole of the connecting sleeve 32, which means that the sealing joint 3 is mainly composed of these three parts, wherein the connecting sleeve 32 is used to provide an installation and constraint basis, the sealing sleeve 33 is used to provide a structural basis for clamping and sealing the through-piece, and the locking sleeve 31 is used to provide a structural basis for adjusting the force. Further elaboration, the sealing sleeve 33 comprises an elastic inner ring component and an elastic outer ring component nested inside and outside, and at least one group of second channels for sealing and clamping the through-piece is formed between the elastic inner ring component and the elastic outer ring component, and the second channel is connected to the first channel, which means that the sealing sleeve 33 is composed of two parts nested inside and outside, and there is a gap between the two parts, namely the elastic inner ring component and the elastic outer ring component, and a second channel connected to the first channel is formed in the gap, so that it is convenient for the through-piece to be routed from the inside of the connecting pipe 2 to the second channel. When there are multiple connecting pipes 2, the number of the second channels matches it. For example, in some embodiments, the number of the second channels is at least three groups, so as to facilitate the sealing connection of more through-pieces.

[0037] In order to make the elastic inner ring component and the elastic outer ring component close to each other or even squeeze each other to achieve the change of the second channel and achieve the purpose of clamping the sealing penetration, the inner hole of the connecting sleeve 32 includes a tapered section 321, and the elastic outer ring component forms a taper match with the tapered section 321. The taper match here mainly refers to the outer wall of the elastic outer ring component forming a tapered surface that cooperates with the inner hole wall of the tapered section 321, so that the self-locking property of the tapered surface can be used to achieve the purpose of squeezing the outer wall of the elastic outer ring component, that is, as the tapered surface shrinks, the outer wall of the elastic outer ring component is squeezed more. In addition, the locking sleeve 31 can act on the elastic inner ring component and / or the elastic outer ring component, so that after the elastic outer ring component is squeezed by the tapered section 321, it clamps the sealing penetration together with the elastic inner ring component, thereby achieving the purpose of sealing connection of the penetration.

[0038] Through the above technical solution, the penetration piece can be routed from the first channel, the inner hole of the connecting pipe 2, and the second channel in sequence, and a stable clamping sealing connection is formed between the elastic inner ring component and the elastic outer ring component. This method not only facilitates the reliable sealing of the penetration piece, but also the clamping method is simple and easy to operate, and the sealing sleeve 33 can be easily replaced at any time. At the same time, the overall structure is compact and simple, which can meet the premise of miniaturization design and can also achieve the sealing clamping of more penetration pieces. In general, this sealing structure can replace the existing penetration piece sealing structure with large volume, complex structure and high processing requirements, and has better sealing performance and stronger adaptability. At the same time, it can also be flexibly assembled and used according to test needs, and can not only seal multiple penetration pieces, but also can seal penetration pieces of different diameters.

[0039] The elastic inner ring assembly and the elastic outer ring assembly not only need to have a certain elastic deformation to achieve the sealing clamping of the above-mentioned action, but also need to ensure the shielding of radiation, so as to ensure the safety and reliability of the test. In this embodiment, the elastic inner ring assembly and the elastic outer ring assembly are mainly composed of two parts, namely the sealing part and the shielding part. For details, please refer to Figure 2 and Figure 3 , the elastic inner ring assembly includes a sealing gasket inner ring 332 and a shielding gasket inner ring 334, the elastic outer ring assembly includes a sealing gasket outer ring 331 and a shielding gasket outer ring 333, the sealing gasket inner ring 332 is sleeved in the inner hole of the sealing gasket outer ring 331, and a channel as at least part of the second channel is formed between the sealing gasket inner ring 332 and the sealing gasket outer ring 331, that is, the channel formed between the sealing gasket inner ring 332 and the sealing gasket outer ring 331 is used as a part of the second channel, and the remaining part is formed by the shielding part. Specifically, the shielding gasket inner ring 334 is sleeved in the inner hole of the shielding gasket outer ring 333, and a channel as the other part of the second channel is formed between the shielding gasket inner ring 334 and the shielding gasket outer ring 333.

[0040] The shielding pad outer ring 333 is located on the side of the sealing pad outer ring 331 close to the first channel, that is, close to the irradiation device, so as to achieve the shielding of radioactive substances. The locking sleeve 31 is used to act on the sealing pad inner ring 332 and / or the sealing pad outer ring 331, so as to facilitate the subsequent taper extrusion action. The shielding pad outer ring 333 and the sealing pad outer ring 331 are both elastic, and the shielding pad outer ring 333 and the sealing pad outer ring 331 are both tapered with the tapered section 321, so as to achieve the above-mentioned extrusion sealing function. It can be understood that the shielding pad outer ring 333 and the sealing pad outer ring 331 together form a cone with an inner hole, and the cone can form a taper with the tapered section 321, so that the shielding pad outer ring 333 and the shielding pad inner ring 334 can seal and clamp the penetration piece, while the sealing pad outer ring 331 and the sealing pad inner ring 332 can also seal and clamp the penetration piece, thereby improving the reliability of the sealing clamping, especially in the case of irradiation environment, the sealing accuracy requirement is higher. In some embodiments, the vertical height of the conical section 321 is smaller than the sum of the vertical heights of the shielding pad outer ring 333 and the sealing pad outer ring 331, so that the radial extrusion pressure of the conical surface of the conical section 321 can effectively act. The taper range of the conical section 321 is 10°-20°. The purpose is to have an appropriate cone angle. When the cone angle is too large, the radial component of force is too large, which increases the friction between the sealing pad 33 and the cone surface. When the cone angle is too small, the radial component of force is too small, and the sealing effect will be poor.

[0041] To improve the clamping fit of the second channel and the feedthrough, refer to Figure 4 and Figure 5 , the shielding gasket inner ring 334 and the sealing gasket inner ring 332 are also elastic, the inner hole wall of the shielding gasket outer ring 334 is provided with a first groove distributed along the axial direction, and the outer ring wall of the shielding gasket inner ring 334 is provided with a second groove distributed along the axial direction, and a first groove and a second groove are spliced ​​together to form a channel as another part of the second channel, that is, the channel formed by the splicing of the first groove and the second groove is another part of the above-mentioned second channel, wherein the first groove and the second groove are a group, and their number is consistent with the number of the second channel. Similarly, the inner hole wall of the sealing gasket outer ring 331 is provided with a third groove 335 distributed along the axial direction, and the outer ring wall of the sealing gasket inner ring 332 is provided with a fourth groove 336 distributed along the axial direction, and a third groove 335 and a fourth groove 336 are spliced ​​together to form a channel as at least part of the second channel. It should be noted that the cross-sectional shape and size of the first groove, the second groove, the third groove 335 and the fourth groove 336 do not have to be exactly the same, and can be selected according to the actual scene requirements. For example, the cross-sectional shape of the groove is semicircular or semi-elliptical, and the cross-sectional shape of the spliced ​​channel is circular or elliptical, which can form a good fit with the through-piece, thereby achieving a better clamping and sealing effect.

[0042] In addition, in order to further ensure the clamping compatibility between the second channel and the through-piece, the shielding pad outer ring 333 and the shielding pad inner ring 334 are made of silicone rubber, flexible graphite and carbon fiber that have been irradiated in the pile (the above three materials must be irradiated in the pile and verified to be qualified. The materials used must be irradiated in the nuclear reaction test reactor to verify the radiation resistance and neutron shielding performance of the materials), so that the shielding pad outer ring 333 and the shielding pad inner ring 334 can withstand a radiation dose greater than 0.6Gy, and the maximum plastic deformation is less than 30%, so as to shield 90% of γ and α rays. Furthermore, in order to improve safety performance, the sealing pad outer ring 331 and the sealing pad inner ring 332 can also be made of the above materials.

[0043] In this embodiment, in order to better achieve the purpose of conveniently controlling the locking sleeve 31 to act on the sealing sleeve 33, please refer to Figure 6 The locking sleeve 31 includes a locking nut 311 and a gland assembly. The locking nut 311 and the end of the connecting sleeve 32 away from the first channel cooperate with each other through threads, which means that the connecting sleeve 32 mainly includes a cylindrical section, a conical cylindrical section (for forming a conical section 321) and a cylindrical section connected in sequence. The cylindrical section close to the first channel is plugged and matched with the connecting pipe 2, and the end of the cylindrical section away from the first channel is processed with threads for cooperating with the locking nut 311. The gland assembly is arranged in the inner hole of the locking nut 311, and the gland assembly has a third channel 314 for communicating with the second channel. When the locking nut 311 is screwed in relative to the connecting sleeve 32, it can drive the gland assembly to act on the elastic inner ring assembly and / or the elastic outer ring assembly, thereby achieving the clamping and sealing of the through-piece. Through the above technical scheme, on the one hand, a third channel (the number of the third channel is equal to that of the second channel) is formed to facilitate the routing of the through-piece, and on the other hand, it is realized that the through-piece can be clamped and sealed by twisting or rotating the locking nut 311, thereby achieving better operation convenience. The force transmitted to the elastic inner ring component and / or the elastic outer ring component (specifically, the outer ring 331 and / or the inner ring 332 of the sealing gasket) through the locking nut 311 is radially extruded inward during the downward movement, so that the hole wall forming the channel is close to the through-piece, thereby achieving the purpose of sealing. The greater the preload force, the greater the extrusion force on the through-piece and the better the sealing effect.

[0044] In order to realize that the gland assembly also has a certain clamping and sealing function for the through-piece, the gland assembly includes a gland inner ring 313 and a gland outer ring 312 which are nested inside and outside, and a third channel 314 is formed between the gland inner ring 313 and the gland outer ring 312. The third channel is also formed by two grooves spliced ​​together, for example, the same molding method as the second channel is adopted (refer to the above description, which will not be repeated here). The locking nut 311 has an action portion that contacts the gland outer ring 312, that is, the cap head of the locking nut 311 has a cover plate with a reduced diameter that can contact and act with the gland outer ring 312, so that at least one of the gland outer ring 312 and the gland inner ring 313 acts as an elastic inner ring assembly and / or an elastic outer ring assembly. Of course, at least one of the gland outer ring 312 and the gland inner ring 313 here represents direct contact with the elastic inner ring component and / or the elastic outer ring component can be only the gland outer ring 312 or the gland inner ring 313, or the gland outer ring 312 and the gland inner ring 313 can act together.

[0045] In order to prevent the gland outer ring 312 from rotating with the locking nut 311, the gland outer ring 312 is provided with a positioning ear 315, and the end of the connecting sleeve 32 is provided with a positioning notch 322 for engaging with the connecting ear 315, so that the connection stability of the gland outer ring 312 is ensured by the mutual engagement of the connecting ear 315 and the positioning notch 322, and the gland outer ring 312 will not rotate with the locking nut 311. In addition, the gland outer ring 312 includes a coaxially formed large diameter section and a small diameter section, the large diameter section is located on the side of the small diameter section away from the first channel, the diameter of the large diameter section is larger than the diameter of the end of the connecting sleeve 32, and the diameter of the small diameter section is smaller than the diameter of the end of the connecting sleeve 32, so that the small diameter section can smoothly enter the inner hole of the connecting sleeve, so as to smoothly interact with the sealing gasket outer ring 331 and / or the sealing gasket inner ring 332. More specifically, the inner holes of the large diameter section and the small diameter section are combined into a stepped hole, the small diameter hole realizes the clamping seal of the through-piece, and the large diameter hole provides space for convenient disassembly or other operations. Through the above technical scheme, the structural form of inner and outer pressure covers, inner and outer gaskets and inner and outer shielding pads is adopted, which can meet the requirements of replacement of sealing rings and shielding rings at any time, and also meet the forward and reverse installation requirements of the penetration parts, and its practicality is wider.

[0046] This embodiment also provides some installation processes of the sealing structure: for the irradiation device of the peripheral channel (the flange material is aluminum alloy, and the connecting seat 1 material is stainless steel), after the irradiation device is assembled, the compensation wire (through-piece) of the sensor led out from the flange passes through the first channel of the connecting seat 1, the connecting pipe 2, and the second channel in sequence. First, weld the connecting seat 1 (base 11 and / or flange 12) to the flange of the irradiation device, and weld the two ends of the connecting pipe 2 to the flange 12 and the connecting sleeve 32 respectively; then, pass the penetration piece through the shielding gasket outer ring 333 and the sealing gasket outer ring 331 in turn, and then install the sealing gasket inner ring 332 and the shielding gasket inner ring 334 into the sealing gasket outer ring 331 and the shielding gasket outer ring 333 respectively, and place the penetration piece into the second channel; then, install the gland inner ring 313, the penetration piece passes through the third channel between the gland outer ring 312 and the gland inner ring 313, and install the gland outer ring 312 into the connecting sleeve 32; finally, fix it with the locking nut 311 and apply a pre-tightening force to complete the sealing of the penetration piece of the irradiation device. When more than three penetrations with different diameters are led out of the irradiation device, it is necessary to customize the gland outer ring 312, gland inner ring 313, sealing gasket outer ring 331, sealing gasket inner ring 332, shielding gasket outer ring 333 and shielding gasket inner ring 334 according to the size of the penetrations, and the through holes thereon must match the diameter of the penetrations.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. It should be noted that the structures or components illustrated in the accompanying drawings are not necessarily drawn to scale, and the present invention omits the description of known components and processing technologies and processes to avoid unnecessary limitations on the present invention.

Claims

1. A sealing structure for a penetration piece of an irradiation device, characterized in that: include: A connecting seat, wherein the connecting seat has a connecting portion connected to the irradiation device, and the connecting seat has a first channel for the penetration member to movably penetrate; a connecting pipe, one end of which is connected to the first channel and communicates with each other so that the penetration piece can penetrate into the first channel, and the other end of the connecting pipe is provided with a sealing joint; Wherein, the sealing joint comprises a locking sleeve, a connecting sleeve and a sealing sleeve arranged in the inner hole of the connecting sleeve, the sealing sleeve comprises an elastic inner ring component and an elastic outer ring component nested inside and outside, at least one set of second channels for sealing and clamping the penetration piece is formed between the elastic inner ring component and the elastic outer ring component, and the second channel is communicated with the first channel; The inner hole of the connecting sleeve includes a tapered section, the elastic outer ring component and the tapered section form a taper fit, and the locking sleeve can act on the elastic inner ring component and / or the elastic outer ring component, so that after the elastic outer ring component is squeezed by the tapered section, it clamps and seals the penetration together with the elastic inner ring component; Wherein, the elastic inner ring assembly includes a sealing gasket inner ring and a shielding gasket inner ring, the elastic outer ring assembly includes a sealing gasket outer ring and a shielding gasket outer ring, the sealing gasket inner ring is sleeved in the inner hole of the sealing gasket outer ring, and a channel serving as at least a part of the second channel is formed between the sealing gasket inner ring and the sealing gasket outer ring; the shielding gasket inner ring is sleeved in the inner hole of the shielding gasket outer ring, and a channel serving as another part of the second channel is formed between the shielding gasket inner ring and the shielding gasket outer ring; The shielding pad outer ring is located on the side of the sealing pad outer ring close to the first channel, the shielding pad outer ring and the sealing pad outer ring are elastic, and both the shielding pad outer ring and the sealing pad outer ring form a taper fit with the conical section; the locking sleeve is used to act on the sealing pad inner ring and / or the sealing pad outer ring.

2. The sealing structure for a penetration piece of an irradiation device according to claim 1, characterized in that: The inner ring of the shielding gasket and the inner ring of the sealing gasket are elastic, the inner hole wall of the outer ring of the shielding gasket is provided with a first groove distributed along the axial direction, the outer ring wall of the inner ring of the shielding gasket is provided with a second groove distributed along the axial direction, the first groove and the second groove are spliced ​​together to form a channel serving as the other part of the second channel; the inner hole wall of the outer ring of the sealing gasket is provided with a third groove distributed along the axial direction, the outer ring wall of the inner ring of the sealing gasket is provided with a fourth groove distributed along the axial direction, the third groove and the fourth groove are spliced ​​together to form a channel serving as at least a part of the second channel.

3. The sealing structure for a penetration piece of an irradiation device according to any one of claims 1 to 2, characterized in that: The number of the second channels is at least three.

4. The sealing structure for a penetration piece of an irradiation device according to claim 2, characterized in that: The outer ring of the shielding pad and the inner ring of the shielding pad are made of silicone rubber, flexible graphite and carbonized fiber that have been irradiated in the pile.

5. The sealing structure for a penetration piece of an irradiation device according to claim 1, characterized in that: The taper range of the tapered section is 10°-20°.

6. The sealing structure for a penetration piece of an irradiation device according to claim 1, characterized in that: The locking sleeve includes a locking nut and a gland assembly. The locking nut and the end of the connecting sleeve away from the first channel cooperate with each other through threads. The gland assembly is arranged in the inner hole of the locking nut, and the gland assembly has a third channel for communicating with the second channel. When the locking nut is screwed in relative to the connecting sleeve, it can drive the gland assembly to act on the elastic inner ring assembly and / or the elastic outer ring assembly.

7. The sealing structure for a penetration piece of an irradiation device according to claim 6, characterized in that: The gland assembly includes a gland inner ring and a gland outer ring which are nested inside and outside, and the third channel is formed between the gland inner ring and the gland outer ring; the locking nut has an acting portion which contacts the gland outer ring, so that at least one of the gland outer ring and the gland inner ring acts on the elastic inner ring assembly and / or the elastic outer ring assembly.

8. The sealing structure for a penetration piece of an irradiation device according to claim 7, characterized in that: The outer ring of the gland is provided with a positioning ear, and the end of the connecting sleeve is provided with a positioning notch for snap-fitting with the positioning ear.

9. The sealing structure for a penetration piece of an irradiation device according to claim 7, characterized in that: The outer ring of the gland includes a coaxially formed large diameter section and a small diameter section, the large diameter section is located on the side of the small diameter section away from the first channel, the diameter of the large diameter section is larger than the diameter of the end of the connecting sleeve, and the diameter of the small diameter section is smaller than the diameter of the end of the connecting sleeve, so that the small diameter section can smoothly enter the inner hole of the connecting sleeve.

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