Sealing device of high-level solid waste overpressure machine and waste treatment equipment

Abstract

The sealing device is arranged at the position where a piston rod of the overpressure machine penetrates through a shielding plate and comprises a shaft sleeve, sealing assemblies and a gas conveying assembly, the shaft sleeve is arranged in a through hole in the shielding plate, an inner hole of the shaft sleeve allows the piston rod to pass through, and the two ends of the shaft sleeve are each provided with one sealing assembly. The sealing assemblies are used for radially sealing the piston rod, a sealing cavity is formed between the inner surface of the shaft sleeve between the two sealing assemblies and the outer surface of the piston rod, and the gas conveying assembly penetrates through the shaft sleeve, communicates with the sealing cavity and is used for supplying gas into the sealing cavity and judging whether sealing failure occurs or not according to the gas supply state. The device is simple in structure, high in sealing performance, easy to replace and capable of monitoring the sealing effectiveness. The invention further provides waste treatment equipment.

Description

Technical Field

[0001] The invention belongs to the technical field of radioactive waste treatment, and in particular relates to a sealing device of a high-level solid waste super press and waste treatment equipment. Background Art

[0002] In the radioactive solid waste treatment process, high-level solid waste generally needs to be compressed using a super press. Specifically, the piston rod of the high-level solid waste super press passes through the shielding plate and enters the hot chamber. When the super press is working, the piston rod needs to move back and forth in a straight line. In order to ensure the seal inside and outside the hot chamber, prevent the aerosol from diffusing with the gas to outside the hot chamber, and prevent the piston rod from bringing radioactive aerosols outside the hot chamber during movement, causing pollution to the environment outside the hot chamber, a sealing structure needs to be set on the shielding plate. However, since the piston rod needs to move, the sealing structure here is a dynamic seal, which is easy to damage and needs to be replaced frequently.

[0003] It is also difficult to replace, and the previous sealing structure is relatively simple, and it is impossible to monitor whether the seal has failed, and it is also difficult to set up monitoring components to ensure the integrity of the seal. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a sealing device for a high-level solid waste super press in view of the above-mentioned deficiencies in the prior art. The device has a simple structure and

[0005] The sealing performance is strong, the replacement is easy, and the sealing effectiveness can be monitored. The invention also provides a waste treatment device.

[0006] The present invention provides a sealing device for a high-level solid waste super press, which is arranged at a position where a piston rod of the super press passes through a shielding plate, and comprises a shaft sleeve, a sealing component and a gas transmission component. The shaft sleeve is arranged inside a through hole on the shielding plate, and the inner hole of the shaft sleeve allows the piston rod to pass through. A group of sealing components are respectively arranged at both ends of the shaft sleeve, which are used to radially seal the piston rod and form a sealing cavity between the inner surface of the shaft sleeve and the outer surface of the piston rod between the two groups of sealing components. The gas transmission component passes through the shaft sleeve and is connected to the sealing cavity, and is used to supply gas to the sealing cavity, and judge whether a sealing failure occurs according to the gas supply state.

[0007] Furthermore, two sleeves are provided, which are butt-jointed along the axial direction of the piston rod, and three groups of sealing assemblies are provided. The three groups of sealing assemblies are respectively arranged between the butt ends of the two sleeves and at the non-butt ends of the two sleeves, so that the sleeves and the corresponding segments of the piston rod form two sealing cavities in the axial direction of the piston rod. The air supply assembly supplies air to the two sealing cavities respectively, and determines whether the sealing failure of the two sealing cavities occurs according to the air supply status.

[0008] Furthermore, the two sealed cavities are set to be the first sealed cavity and the second sealed cavity from the outside to the inside of the shielding plate, and the gas supply assembly supplies gas to the first sealed cavity and the second sealed cavity respectively, so that the air pressure in the first sealed cavity is greater than the air pressure in the second sealed cavity, and the air pressure in the second sealed cavity is greater than the ambient air pressure inside the shielding plate.

[0009] Furthermore, the gas delivery component comprises a control module and a monitoring component (51), wherein the monitoring components are provided with two flow meters, each of which is used to monitor the flow value of gas supplied by the gas delivery component to the two sealed cavities, respectively; the control module is electrically connected to the two monitoring components, respectively, and is used to determine that a sealing failure has occurred and generate sealing component damage information when the flow value monitored by the monitoring component exceeds a set range.

[0010] Furthermore, three groups of sealing components are set as the first sealing component, the second sealing component and the third sealing component from the outside to the inside of the shielding plate, respectively. When the flow value of the monitoring component of the first sealing cavity exceeds the set range, the control module generates damage information of the first sealing component and / or the second sealing component, and when the flow value of the monitoring component of the second sealing cavity exceeds the set range, the control module generates damage information of the second sealing component and / or the third sealing component.

[0011] Furthermore, the through hole on the shielding plate is a stepped hole, which is divided into two sections, wherein the diameter of the first hole section close to the outer side of the shielding plate is larger than the diameter of the second hole section close to the inner side of the shielding plate, and the two sleeves are set to be the first sleeve and the second sleeve from the outer side to the inner side of the shielding plate respectively, the second sleeve is arranged in the first hole section of the stepped hole, and the end face facing the inner side of the shielding plate presses the third sealing assembly against the step surface at the connection between the two hole sections of the stepped hole, one section of the first sleeve is inserted into the first hole section of the stepped hole, and the end face of this section and the end face of the second sleeve facing the outer side of the shielding plate press the two sides of the second sealing assembly together; the other section of the first sleeve is arranged on the outer side of the shielding plate, and the first sealing assembly is arranged in the inner hole of this section.

[0012] Furthermore, the device also includes a first guide sleeve, the inner hole of the first sleeve is a stepped hole, the diameter of the hole section close to the outer side of the shielding plate in the stepped hole is larger than the diameter of the hole section close to the inner side of the shielding plate, the first guide sleeve is arranged in the large diameter hole section of the stepped hole of the first sleeve, the inner hole of the first guide sleeve allows the piston rod to pass through, and the end face of the first guide sleeve facing the inner side of the shielding plate presses the first sealing assembly against the step surface of the stepped hole of the first sleeve.

[0013] Furthermore, the device also includes a second guide sleeve, the inner hole of the second sleeve is a stepped hole, the diameter of the hole section close to the inner side of the shielding plate in the stepped hole is larger than the diameter of the hole section close to the outer side of the shielding plate, the second guide sleeve is arranged in the large diameter hole section of the second sleeve stepped hole, the inner hole of the second guide sleeve allows the piston rod to pass through, and the end surface of the second guide sleeve facing the outer side of the shielding plate is tightened by the step surface of the second sleeve stepped hole, so that the end surface of the second guide sleeve facing the inner side of the shielding plate together with the end surface of the second sleeve facing the inner side of the shielding plate presses the third sealing assembly against the step surface of the stepped hole of the shielding plate.

[0014] Furthermore, a protruding flange ring structure is provided on the outer peripheral surface of the segment of the first sleeve disposed on the outer side of the shielding plate, and an elastic sealing member is sandwiched between the flange ring structure and the outer surface of the shielding plate.

[0015] Furthermore, each group of the sealing assembly includes a bracket, a sealing ring and a dust ring. A first groove is provided on the surface of the bracket in contact with the piston rod, and a second groove is provided on the surface of the bracket in contact with the shaft sleeve / shielding plate. Two sealing rings are provided, one sealing ring and the dust ring are embedded in the first groove together, thereby forming a dynamic seal with the piston rod, and the dust ring in the first groove is closer to the outside of the shielding plate than the sealing ring. The other sealing ring is embedded in the second groove, thereby forming a static seal with the shaft sleeve / shielding plate.

[0016] The present invention also provides a waste treatment equipment, including a super press, a hot chamber and the sealing device of the above-mentioned high-level solid waste super press, the interior of the hot chamber is used as a waste treatment space, the piston rod of the super press passes through the shielding plate of the hot chamber, and is used to compress the waste, and the sealing device of the high-level solid waste super press is arranged at the position where the piston rod of the super press passes through the shielding plate, and is used to seal the gap between the piston rod and the shielding plate.

[0017] The sealing device of the high-level solid waste super press of the present invention comprises a sleeve, a sealing assembly and a gas supply assembly. A set of sealing assemblies are respectively arranged at both ends of the sleeve, which are used to radially seal the piston rod, and the inner surface of the sleeve and the outer surface of the piston rod between the two sets of sealing assemblies form a sealing cavity, and then the gas supply assembly is used to supply gas into the sealing cavity. In this setting structure, firstly, two sets of sealing assemblies are used in combination. On the one hand, through this arrangement, even if any one of the sets is damaged and fails, it does not affect the sealing function of the other set. On the other hand, the sealing cavity formed by the two sets of sealing assemblies provides space for the setting of gas supply, that is, it provides a feasible setting scheme for monitoring the sealing through the gas supply state without affecting the sealing performance; and further adopting the gas supply mode, on the one hand, the sealing integrity can be monitored through the gas supply state, so that the sealing failure can be discovered in time and the leakage problem can be effectively avoided. On the other hand, the gas supply setting originally used to monitor the sealing performance can also achieve gas sealing. At the same time, the sealing effect of the sealing assemblies on both sides is strengthened by air pressure, and the gas inside the shielding plate can be prevented from flowing out.

[0018] It can be seen that compared with the conventional dynamic sealing structure in which a sealing ring is directly used at the gap, the sealing device of the present invention not only further improves the sealing performance through ingenious structural setting and creative combination, but also provides a setting space for sealing monitoring. At the same time, the sealing monitoring setting itself also enhances the sealing ability, and can realize the monitoring of sealing performance without affecting the sealing integrity. The overall effect complements each other. And precisely because the sealing performance is much higher than the conventional dynamic sealing structure, it is possible to use a sealing component that is easier to disassemble and install, which is convenient for timely replacement when failure occurs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 1 is a schematic structural diagram of a sealing device for a high-level solid waste super press in Example 1 of the present invention;

[0020] Figure 2 yes Figure 1 A magnified view of the structure at center A;

[0021] Figure 3 yes Figure 1 A magnified view of the structure at B in the middle;

[0022] Figure 4 yes Figure 1 Enlarged view of the structure at C in the middle.

[0023] In the figure: 1. Shielding plate; 2. Piston rod; 3. Bushing; 31. First bushing; 32. Second bushing; 4. Sealing assembly; 41. First sealing assembly; 42. Second sealing assembly; 43. Third sealing assembly; 44. Bracket; 45. Sealing ring; 46. Dustproof ring; 5. Gas transmission assembly; 51. Monitoring component; 6. First guide sleeve; 7. Second guide sleeve. DETAILED DESCRIPTION

[0024] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of the present invention.

[0025] In the description of the present invention, it should be noted that the terms "upper", "lower" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience and simplification of the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0026] In the description of the present invention, the terms “first”, “second” and “third” are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connect", "set", "install", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection or 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 those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0028] Example 1

[0029] like Figure 1 As shown, the sealing device of the high-level solid waste super press of the present embodiment is arranged at the position where the piston rod 2 of the super press passes through the shielding plate 1, and comprises a sleeve 3, a sealing component 4 and a gas supply component 5. The sleeve 3 is arranged inside the through hole on the shielding plate 1, and the inner hole of the sleeve 3 allows the piston rod 2 to pass through. A group of sealing components 4 are respectively provided at both ends of the sleeve 3 for radially sealing the piston rod 2, and forming a sealed cavity between the inner surface of the sleeve 3 and the outer surface of the piston rod 2 between the two groups of sealing components 4. The gas supply component 5 passes through the sleeve 3 and is connected to the sealed cavity, and is used to supply gas to the sealed cavity, and judge whether the sealing failure occurs according to the gas supply state.

[0030] The sealing device of the high-level solid waste super press of the present embodiment firstly adopts the combined effect of two groups of sealing components 4. On the one hand, this arrangement ensures that even if any one of the groups is damaged and fails, it will not affect the sealing function of the other group. On the other hand, the sealing cavity formed by the two groups of sealing components 4 provides space for the setting of the gas supply, that is, it provides a feasible setting scheme for monitoring the sealing through the gas supply status without affecting the sealing. And further adopting the gas supply method, on the one hand, the sealing integrity can be monitored through the gas supply status, so that the sealing failure can be discovered in time and the leakage problem can be effectively avoided. On the other hand, the gas supply setting originally used to monitor the sealing can also achieve gas sealing. At the same time, the sealing effect of the sealing components on both sides is strengthened by air pressure, and the gas outflow from the inner side of the shielding plate 1 can be avoided.

[0031] It can be seen that compared with the conventional dynamic sealing structure in which a sealing ring is directly used at the gap, the sealing device of this embodiment not only further improves the sealing performance through ingenious structural setting and creative combination, but also provides a setting space for sealing monitoring. At the same time, the sealing monitoring setting itself also enhances the sealing ability, and can realize the monitoring of sealing performance without affecting the integrity of the seal. The overall effect complements each other. And precisely because the sealing performance is much higher than the conventional dynamic sealing structure, a sealing component that is easier to disassemble and install can be used, which is convenient for timely replacement when failure occurs.

[0032] In this embodiment, two sleeves 3 are provided, which are butt-jointed along the axial direction of the piston rod 2. Three groups of sealing assemblies 4 are provided, and the three groups of sealing assemblies 4 are respectively arranged between the butt ends of the two sleeves 3 and at the non-butt ends of the two sleeves 3, so that in the axial direction of the piston rod 2, the sleeves 3 and the corresponding sections of the piston rod 2 form two sealed cavities. The air supply assembly 5 supplies air to the two sealed cavities respectively, and judges whether the sealing failure of the two sealed cavities occurs respectively according to the air supply status.

[0033] This embodiment further optimizes the above-mentioned structural setting of separating two sealing chambers by three groups of sealing components 4 according to the working conditions of the super pressurizer. On the one hand, this structural setting increases the sealing of the first-level sealing component 4 and the first-level air seal; on the other hand, it can make the piston rod 2 segment corresponding to the sealing setting as long as possible without making the single-stage air seal too long. Therefore, it will not affect the accuracy and effectiveness of the sealing integrity monitoring, and can ensure that the radioactive material on the inside of the shielding plate 1 will not be brought out through the piston rod 2 when the super pressurizer is working.

[0034] More importantly, when the monitoring component shows that the air supply state is abnormal, if the abnormal air supply state is in the sealed cavity near the outside of the shielding plate 1, the damaged sealing components 4 at both ends of the outer sealed cavity can be directly replaced, and there is still a layer of sealing components 4 inside, so there is no need to de-source the radiation source inside the shielding plate 1; and when the abnormality is in the sealed cavity near the inside of the shielding plate 1, the sealing component 4 near the outside of the shielding plate 1 in the inner sealed cavity can also be directly replaced. If the damaged sealing component 4 near the inside of the shielding plate 1 is still able to ensure the airtight and dynamic sealing effects, it does not need to be directly replaced. Therefore, there is no need to de-source the radiation source inside the shielding plate 1, but to de-source and clean the radiation source inside the shielding plate 1 during the overhaul period before replacement. It can be seen that the setting of the two sealed cavities can further simplify the disassembly and replacement steps, avoid a significant impact on the production progress due to maintenance, and extend the overhaul time cycle.

[0035] In this embodiment, two sealed cavities are set to be the first sealed cavity and the second sealed cavity from the outside to the inside of the shielding plate 1, and the gas delivery component 5 supplies gas to the first sealed cavity and the second sealed cavity respectively, so that the air pressure in the first sealed cavity is greater than the air pressure in the second sealed cavity, and the air pressure in the second sealed cavity is greater than the ambient air pressure inside the shielding plate 1. That is, the air pressure in the first sealed cavity, the second sealed cavity and the inside of the shielding plate 1 is distributed in a gradually decreasing gradient, so when the gas flows, it will automatically flow to the low-pressure area to prevent radioactive substances from leaking with the gas.

[0036] In this embodiment, the gas delivery component 5 includes a control module and a monitoring component 51. The monitoring components 51 are provided with two flow meters, which are respectively used to monitor the flow value of the gas delivery component 5 supplying gas to the two sealed cavities. The control module is electrically connected to the two monitoring components 51, respectively, and is used to determine that the seal failure occurs and generate damage information of the sealing component 4 when the flow value monitored by the monitoring component 51 exceeds the set range. The gas delivery component 5 can be connected to the sealed cavity by a gas delivery pipe, and the flow meter is arranged on the gas delivery pipe, and the gas supply flow value is monitored by monitoring the flow in the pipe. When the air tightness in the sealed cavity is intact, the gas delivery component 5 will not continue to supply gas to the inside of the sealed cavity while ensuring a certain pressure in the sealed cavity, so the flow meter reading is basically zero and remains unchanged. If the flow meter reading increases, it means that the seal is damaged. The aforementioned setting range can be specifically set according to the sensitivity of the selected flow meter to avoid misjudgment, which will not be repeated here. In other embodiments, other instruments such as pressure can also be used as monitoring components 51.

[0037] In this embodiment, three groups of sealing components 4 are set to be the first sealing component 41, the second sealing component 42 and the third sealing component 43 from the outside to the inside of the shielding plate 1, that is, on the whole, the first sealing component 41, the second sealing component 42, the first sleeve 31 and the piston rod 2 form a first sealing cavity, the first sleeve 31 is radially provided with an air inlet hole, which is connected to the air supply pipeline of the air transmission component 5, and a gas flow meter is installed on the air supply pipeline to monitor the first sealing cavity; the second sealing component 42, the third sealing component 43, the second sleeve 32 and the piston rod 2 form a second sealing cavity, the second sleeve 32 is radially provided with an air inlet hole, which is connected to the air supply pipeline, and a gas flow meter is installed on the air supply pipeline to monitor the second sealing cavity.

[0038] The control module generates damage information of the first sealing component 41 and / or the second sealing component 42 when the flow value of the monitoring component 51 of the first sealing cavity exceeds the set range, and generates damage information of the second sealing component 42 and / or the third sealing component 43 when the flow value of the monitoring component 51 of the second sealing cavity exceeds the set range.

[0039] In the present embodiment, the through hole on the shielding plate 1 is a stepped hole, which is divided into two sections, wherein the diameter of the first hole section close to the outer side of the shielding plate 1 is larger than the diameter of the second hole section close to the inner side of the shielding plate 1 (the outer side of the shielding plate 1 refers to the outer side of the heat chamber or shielding chamber formed by the shielding plate 1, and the inner side also refers to the inner side of the heat chamber or shielding chamber formed by the shielding plate 1), and two sleeves 3 are set to be the first sleeve 31 and the second sleeve 32 from the outer side to the inner side of the shielding plate 1, respectively, the second sleeve 32 is arranged in the first hole section of the stepped hole, and the end surface facing the inner side of the shielding plate 1 presses the third sealing component 43 against the step surface at the connection between the two hole sections of the stepped hole, a section of the first sleeve 31 is penetrated in the first hole section of the stepped hole, and the end surface of this section and the end surface of the second sleeve 32 facing the outer side of the shielding plate 1 press the two sides of the second sealing component 42 together; another section of the first sleeve 31 is arranged on the outer side of the shielding plate 1, and the first sealing component 41 is arranged in the inner hole of this section.

[0040] This segmented structure is more convenient for disassembly, assembly and replacement of the sealing device. Figure 1(The above, below, etc. in the following expressions are made according to the above and below positions in the attached drawings). When the reading of the gas flow meter in the first sealed cavity is basically zero and remains unchanged, it indicates that the first sealing assembly 41 and the second sealing assembly 42 have good performance. If the reading of the gas flow meter increases, it indicates that the first sealing assembly 41 and / or the second sealing assembly 42 are damaged and need to be replaced at the same time. During replacement, the first sleeve 31, the first guide sleeve 6, and the first sealing assembly 41 are taken out upward as a combined module, and then the second sealing assembly 42 is taken out upward, and then the new second sealing assembly 42 is reinstalled, and finally the first sleeve 31, the first guide sleeve 6, and the first sealing assembly 41 combined module after the first sealing assembly 41 is replaced are reinstalled as a whole.

[0041] When the reading of the gas flow meter in the second sealed chamber is basically zero and remains unchanged, it means that the performance of the second sealing assembly 42 and the third sealing assembly 43 is good. If the reading of the gas flow meter increases, it means that the second sealing assembly 42 and / or the third sealing assembly 43 are damaged and the second sealing assembly 42 needs to be replaced. During replacement, the first sleeve 31, the first guide sleeve 6, and the first sealing assembly 41 are taken out upward as a combined module, and then the second sealing assembly 42 is taken out upward, and then the new second sealing assembly 42 is reinstalled, and finally the first sleeve 31, the first guide sleeve 6, and the first sealing assembly 41 combined module are reinstalled as a whole. After reinstallation, if the reading of the gas flow meter in the second sealed chamber is not zero, but remains unchanged at a certain value, it means that the third sealing assembly 43 has failed, but can continue to be used. The third sealing assembly 43 can be replaced after the radiation source is removed and cleaned in the hot chamber during the overhaul period, and the piston rod 2 is taken out.

[0042] Since the piston rod 2 moves up and down during operation, after moving downward, the part of the piston rod 2 that enters the radioactive environment below (hot chamber or shielding chamber) will be contaminated. The contaminated part cannot directly enter the clean area above when moving upward, and can only reach the lower end of the first sealing component 41 at most. Therefore, according to the movement stroke requirements, this embodiment sets the spacing between the first sealing component 41 and the third sealing component 43 to be greater than the working stroke, and accordingly sets a part of the first sleeve 31 outside the shielding plate 1.

[0043] In this embodiment, the device also includes a first guide sleeve 6, the inner hole of the first sleeve 31 is a stepped hole, the diameter of the hole section close to the outer side of the shielding plate 1 in the stepped hole is larger than the diameter of the hole section close to the inner side of the shielding plate 1, the first guide sleeve 6 is arranged in the large-diameter hole section of the stepped hole of the first sleeve 31, the inner hole of the first guide sleeve 6 allows the piston rod 2 to pass through, and the end face of the first guide sleeve 6 facing the inner side of the shielding plate 1 presses the first sealing assembly 41 against the step surface of the stepped hole of the first sleeve 31 to prevent the first sealing assembly 41 from falling out of the original position due to the movement of the piston rod 2.

[0044] In this embodiment, the device further includes a second guide sleeve 7, the inner hole of the second sleeve 32 is a stepped hole, the diameter of the hole section near the inner side of the shielding plate 1 in the stepped hole is larger than the diameter of the hole section near the outer side of the shielding plate 1, the second guide sleeve 7 is arranged in the large diameter hole section of the stepped hole of the second sleeve 32, the inner hole of the second guide sleeve 7 allows the piston rod 2 to pass through, and the end face of the second guide sleeve 7 facing the outer side of the shielding plate 1 is pressed against the step surface of the stepped hole of the second sleeve 32, so that the end face of the second guide sleeve 7 facing the inner side of the shielding plate 1 and the end face of the second sleeve 32 facing the inner side of the shielding plate 1 together press the third sealing assembly 43 against the step surface of the stepped hole of the shielding plate 1. The first guide sleeve 6 and the second guide sleeve 7 can not only assist in pressing the sealing assembly, but also support and guide the movement of the piston rod 2.

[0045] In this embodiment, Figure 1 As shown, the first sleeve 31 is provided with a protruding flange ring structure on the outer peripheral surface of the segment on the outside of the shielding plate 1, and an elastic seal is sandwiched between the flange ring structure and the outer surface of the shielding plate 1, that is, an elastic seal is provided between the end surface of the flange ring structure facing the shielding plate 1 and the outer surface of the shielding plate 1. The flange ring structure can better fix the sleeve on the shielding plate 1, and the elastic seal can be an O-ring, which can be compressed, so as to ensure that the first sleeve can be compressed by bolts and the sealing components can be compressed.

[0046] In this embodiment, each group of sealing components 4 includes a bracket 44, a sealing ring 45 and a dust ring 46. A first groove is provided on the surface of the bracket 44 that contacts the piston rod 2, and a second groove is provided on the surface that contacts the sleeve 3 / shielding plate 1. Two sealing rings 45 are provided. One sealing ring 45 and the dust ring 46 are embedded in the first groove together, so as to form a dynamic seal with the piston rod 2, and the dust ring 46 in the first groove is closer to the outer side of the shielding plate 1 than the sealing ring 45. The other sealing ring 45 is embedded in the second groove, so as to form a static seal with the sleeve 3 / shielding plate 1.

[0047] Specifically, the bracket 44 can be a metal bracket, and the sealing ring 45 can be an O-ring. Figure 2 As shown, in the first sealing assembly 41, the first groove is a groove formed on the inner surface of the bracket 44, and the second groove is formed on the surface of the bracket 44 in contact with the step surface of the first sleeve 31 (i.e. Figure 2 The dovetail groove of the lower surface of the first sealing assembly 41 in the metal bracket is provided, a dust ring 46 and an O-ring 45 are installed in the first groove of the metal bracket as an axial dynamic seal of the piston rod 2, and another O-ring 45 is installed in the second groove of the metal bracket as an end surface static seal.

[0048] like Figure 3As shown, the first groove of the second sealing component 42 is a groove opened on the inner hole surface of the bracket 44, and the second groove is a groove opened on the outer circle (outer edge) surface of the bracket 44. An O-ring 45 and a dust ring 46 are installed in the inner hole groove of the metal bracket as an axial dynamic seal of the piston rod 2, and another O-ring 45 is installed in the outer edge groove of the metal bracket as a radial static seal.

[0049] like Figure 4 As shown, the first groove of the third sealing component 43 is a groove opened on the inner hole surface of the bracket 44, and the second groove is opened on the surface of the bracket 44 that contacts the step surface of the through hole of the shielding plate 1 (ie Figure 4 an O-ring 45 and a dust ring 46 are installed in the inner hole groove of the metal bracket as an axial dynamic seal of the piston rod 2, and another O-ring 45 is installed in the dovetail groove on the lower end surface of the metal bracket as an end surface static seal.

[0050] In general, this embodiment provides a sealing device for a high-level solid waste super press, which is used in the technical field of radioactive solid waste treatment, and aims to solve the problem that the sealing structure of the piston rod 2 of the high-level solid waste super press passing through the shielding plate 1 cannot be monitored for failure and is difficult to replace. It can be used in the gap position where the piston rod 2 of the super press passes through the shielding plate 1 of the hot chamber.

[0051] Combined with Figure 1 In the structure shown in the figure, the upper side of the shielding plate 1 is the outer side, and the lower side is the inner side. The main components of the device are the shielding plate 1, the piston rod 2, the upper sleeve (the first sleeve 31), the lower sleeve (the second sleeve 32), the upper guide sleeve (i.e., the first guide sleeve 6), the lower guide sleeve (i.e., the second guide sleeve 7), the upper sealing assembly (the first sealing assembly 41), the middle sealing assembly (the second sealing assembly 42), and the lower sealing assembly (the third sealing assembly 43).

[0052] The lower sealing assembly is installed at the step at the lower end of the through hole of the shielding plate 1; the lower guide sleeve is embedded in the lower end of the lower sleeve, and is installed together in the through hole of the shielding plate 1 and on the lower sealing assembly; the middle sealing assembly is installed in the through hole of the shielding plate and on the lower sleeve; the upper sleeve is installed in the through hole of the shielding plate and on the middle sealing assembly; the upper sealing assembly is installed in the upper part of the inner hole of the upper sleeve; the upper guide sleeve is embedded in the upper sleeve and on the upper sealing assembly; the piston rod 2 passes through the upper guide sleeve, the upper sealing assembly, the middle sealing assembly, the lower guide sleeve, and the lower sealing assembly from top to bottom, and passes through the heat chamber below the shielding plate 1. A first annular cylindrical sealing cavity is formed between the upper sealing assembly, the middle sealing assembly, the first sleeve and the piston rod, and a second annular cylindrical sealing cavity is formed between the middle sealing assembly, the lower sealing assembly, the second sleeve and the piston rod.

[0053] When in use, the piston rod 2 passes through the shielding plate 1 and cooperates with the upper guide sleeve (i.e., the first guide sleeve 6) and the lower guide sleeve (i.e., the second guide sleeve 7); a dynamic seal is formed between the upper sealing assembly (the first sealing assembly 41), the middle sealing assembly (the second sealing assembly 42), the lower sealing assembly (the third sealing assembly 43) and the piston rod 2; the upper sealing assembly and the middle sealing assembly constitute an upper sealing chamber (the first sealing chamber), radially supplying air from the upper sleeve (the first sleeve 31), and a gas flow meter is installed on the air supply pipeline to monitor the upper sealing chamber; the middle sealing assembly and the lower sealing assembly constitute a lower sealing chamber (the second sealing chamber), radially supplying air from the lower sleeve (the second sleeve 32), and a gas flow meter is installed on the air supply pipeline to monitor the lower sealing chamber, and the gas supply gas can be compressed air, and the gas supply pressure of the lower sealing chamber is ≥0.1MPa, and the pressure difference between the upper sealing chamber and the lower sealing chamber is ≥0.1MPa. The gas supply pressure of the upper sealing chamber is greater than the gas supply pressure of the lower sealing chamber, and the gas supply pressure of the lower sealing chamber is greater than the ambient pressure in the lower heat chamber, so as to ensure that the airflow flows from the heat chamber outside to the heat chamber. The device of this embodiment has the following beneficial effects:

[0054] 1. The structure is equipped with upper and lower shaft sleeves and upper, middle and lower sealing rings. At the same time, gas is introduced into the upper and lower sealing cavities formed by the three seals to form a gas seal. The sealing ring seal and the gas seal form a double guarantee.

[0055] 2. The upper and lower sleeves form a transition area to prevent the piston rod 2 from entering the area contaminated by radioactive aerosols inside the hot chamber and then being exposed outside the hot chamber after movement, causing contamination outside the hot chamber.

[0056] 3. The air supply pressure of the upper sealed chamber is greater than that of the lower sealed chamber, and the air supply pressure of the lower sealed chamber is greater than the ambient pressure in the hot chamber, ensuring that the airflow flows from the hot chamber to the hot chamber and preventing the radioactive aerosol from leaking out.

[0057] 4. The sealing structure can monitor whether the sealing component 4 fails through the gas flow meter on the gas supply pipeline. After the seal fails, it can be replaced outside the hot room without damaging the sealing boundary.

[0058] Example 2

[0059] The waste treatment equipment of this embodiment includes a super press, a hot chamber and the sealing device of the high-level solid waste super press in Example 1. The interior of the hot chamber is used as a waste treatment space. The piston rod 2 of the super press passes through the shielding plate 1 of the hot chamber to compress the waste. The sealing device of the high-level solid waste super press is arranged at the position where the piston rod 2 of the super press passes through the shielding plate 1 to seal the gap between the piston rod 2 and the shielding plate 1.

[0060] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A sealing device for a high-level solid waste super press, arranged at the position where the piston rod (2) of the super press passes through the shielding plate (1), characterized in that: It comprises a shaft sleeve (3), a sealing component (4) and a gas transmission component (5). The shaft sleeve (3) is arranged inside the through hole on the shielding plate (1), and the inner hole of the shaft sleeve (3) allows the piston rod (2) to pass through. A set of sealing components (4) are respectively provided at both ends of the shaft sleeve (3) for radially sealing the piston rod (2) and forming a sealing cavity between the inner surface of the shaft sleeve (3) and the outer surface of the piston rod (2) between the two sets of sealing components (4). The gas delivery component (5) passes through the shaft sleeve (3) and is connected to the sealing cavity, and is used to supply gas to the sealing cavity and determine whether a sealing failure occurs based on the gas supply status.

2. The sealing device of the high-level solid waste super press according to claim 1 is characterized in that: The shaft sleeves (3) are provided with two, which are arranged in a butt joint along the axial direction of the piston rod (2). The sealing assembly (4) is provided in three groups, and the three groups of the sealing assembly (4) are respectively arranged between the butt ends of the two sleeves (3) and at the non-butt ends of the two sleeves (3), so that the sleeves (3) and the corresponding sections of the piston rod (2) form two sealing cavities in the axial direction of the piston rod (2). The gas delivery assembly (5) supplies gas to the two sealed cavities respectively, and determines whether sealing failure occurs in the two sealed cavities respectively according to the gas supply status.

3. The sealing device of the high-level solid waste super press according to claim 2 is characterized in that: The two sealed cavities are respectively defined as a first sealed cavity and a second sealed cavity from the outside to the inside of the shielding plate (1), The gas delivery assembly (5) supplies gas to the first sealed cavity and the second sealed cavity respectively, so that the air pressure in the first sealed cavity is greater than the air pressure in the second sealed cavity, and the air pressure in the second sealed cavity is greater than the ambient air pressure inside the shielding plate (1).

4. The sealing device for high-level solid waste super press according to claim 3 is characterized in that: The gas delivery assembly (5) comprises a control module and a monitoring component (51). The monitoring components (51) are provided with two flow meters, which are respectively used to monitor the flow value of gas supplied by the gas delivery component (5) to the two sealed chambers. The control module is electrically connected to the two monitoring components (51) respectively, and is used to determine that a sealing failure has occurred and generate damage information of the sealing component (4) when the flow value monitored by the monitoring component (51) exceeds a set range.

5. The sealing device for high-level solid waste super press according to claim 4 is characterized in that: The three sealing components (4) are respectively a first sealing component (41), a second sealing component (42) and a third sealing component (43) from the outside to the inside of the shielding plate (1). The control module generates damage information of the first sealing component (41) and / or the second sealing component (42) when the flow value of the monitoring component (51) of the first sealing chamber exceeds a set range, and When the flow value of the monitoring component (51) of the second sealed cavity exceeds a set range, damage information of the second sealing component (42) and / or the third sealing component (43) is generated.

6. The sealing device of the high-level solid waste super press according to claim 2 is characterized in that: The through hole on the shielding plate (1) is a stepped hole, which is divided into two sections, wherein the diameter of the first hole section close to the outside of the shielding plate (1) is larger than the diameter of the second hole section close to the inside of the shielding plate (1). The two shaft sleeves (3) are respectively a first shaft sleeve (31) and a second shaft sleeve (32) from the outside to the inside of the shielding plate (1), The three sealing components (4) are respectively a first sealing component (41), a second sealing component (42) and a third sealing component (43) from the outside to the inside of the shielding plate (1). The second shaft sleeve (32) is arranged in the first hole section of the stepped hole, and the third sealing assembly (43) is pressed against the step surface at the connection between the two hole sections of the stepped hole with the end surface facing the inner side of the shielding plate (1). A section of the first shaft sleeve (31) is inserted into the first hole section of the stepped hole, and the end surface of the section and the end surface of the second shaft sleeve (32) facing the outside of the shielding plate (1) are pressed against two sides of the second sealing assembly (42); Another section of the first shaft sleeve (31) is arranged outside the shielding plate (1), and the first sealing component (41) is arranged in the inner hole of the other section.

7. The sealing device of the high-level solid waste super press according to claim 6 is characterized in that: It also includes a first guide sleeve (6), The inner hole of the first shaft sleeve (31) is a stepped hole, wherein the diameter of the hole section close to the outer side of the shielding plate (1) is larger than the diameter of the hole section close to the inner side of the shielding plate (1). The first guide sleeve (6) is arranged in the large diameter hole section of the stepped hole of the first shaft sleeve (31), and the inner hole of the first guide sleeve (6) allows the piston rod (2) to pass through. The first guide sleeve (6) has its end surface facing the inner side of the shielding plate (1) pressing the first sealing assembly (41) against the step surface of the step hole of the first shaft sleeve (31).

8. The sealing device for high-level solid waste super press according to claim 6 is characterized in that: It also includes a second guide sleeve (7), The inner hole of the second shaft sleeve (32) is a stepped hole, wherein the diameter of the hole section close to the inner side of the shielding plate (1) is larger than the diameter of the hole section close to the outer side of the shielding plate (1). The second guide sleeve (7) is arranged in the large diameter hole section of the stepped hole of the second sleeve (32), and the inner hole of the second guide sleeve (7) allows the piston rod (2) to pass through. The end surface of the second guide sleeve (7) facing the outside of the shielding plate (1) is pressed against the step surface of the step hole of the second shaft sleeve (32), so that the end surface of the second guide sleeve (7) facing the inside of the shielding plate (1) and the end surface of the second shaft sleeve (32) facing the inside of the shielding plate (1) together press the third sealing assembly (43) against the step surface of the step hole of the shielding plate (1).

9. The sealing device for high-level solid waste super press according to claim 6, characterized in that: The first shaft sleeve (31) is provided with a protruding flange ring structure on the outer peripheral surface of the segment arranged on the outside of the shielding plate (1), and an elastic sealing member is sandwiched between the flange ring structure and the outer surface of the shielding plate (1).

10. The sealing device of a high-level solid waste super press according to any one of claims 1 to 9, characterized in that: Each set of the sealing components (4) comprises a bracket (44), a sealing ring (45) and a dust ring (46). The support (44) has a first groove on its surface in contact with the piston rod (2), and a second groove on its surface in contact with the shaft sleeve (3) / shielding plate (1). The sealing rings (45) are provided with two, one sealing ring (45) and a dust ring (46) are embedded in the first groove, thereby fitting with the piston rod (2) to form a dynamic seal, and the dust ring (46) in the first groove is closer to the outer side of the shielding plate (1) than the sealing ring (45). Another sealing ring (45) is embedded in the second groove, thereby fitting with the shaft sleeve (3) / shielding plate (1) to form a static seal.

11. A waste treatment device, characterized in that: A super press, a hot chamber and a sealing device for a high-level solid waste super press according to any one of claims 1 to 10, The interior of the hot chamber is used as a waste treatment space. The piston rod (2) of the super compressor passes through the shielding plate (1) of the hot chamber to compress the waste. The sealing device of the high-level solid waste super press is arranged at the position where the piston rod (2) of the super press passes through the shielding plate (1), and is used to seal the gap between the piston rod (2) and the shielding plate (1).

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