Sealing device

Abstract

The utility model provides a sealing device. The sealing device comprises two annular plates which are arranged in parallel and oppositely in the first direction; first sealing structures are arranged on the first surfaces, opposite to each other, of the two annular plates; a first sealing structure and a second sealing structure are arranged on the first surface of one annular plate at intervals, and the second sealing structure is close to the axis of one annular plate relative to the first sealing structure; one end of the pipe is detachably and hermetically connected with one annular plate through a second sealing structure, and the other end of the pipe is hermetically connected with the other annular plate; the two annular plates can be detachably connected with end plates at the two ends of a to-be-detected object in a sealed mode through the first sealing structures, so that the two annular plates, the pipe and the to-be-detected object can form a closed space, the closed space is provided with a communication part capable of being communicated with the outside, and the axis direction of the pipe and the axis direction of the to-be-detected object are both the first direction. According to the sealing device, the weight is reduced by reducing the contact area of gas and the sealing device during pressure measurement, the cost is lower, and assembling is facilitated.

Description

Technical Field

[0001] The present application relates to the technical field of pressure testing, and in particular to a sealing device. Background Art

[0002] An expansion joint is a flexible structure installed on a container shell or pipeline to compensate for additional stress caused by temperature difference and mechanical vibration. Before the expansion joint leaves the factory, it needs to be pressure tested to ensure its tightness: the internal pressure of the expansion joint is 0.02Mpa and the pressure is maintained for 15 minutes. During the pressure test, a sealing device is required to seal both ends of the expansion joint to maintain pressure. However, in the field of gas turbines, the expansion joints used in the assembly process are very large, with a maximum diameter of up to 5.2 meters and a height of up to 2 meters, which makes it difficult to maintain pressure for large-sized expansion joints.

[0003] The sealing device for large-diameter expansion joints in the prior art includes: a pull rod and two blind plates spaced and facing each other, the two ends of the pull rod are respectively threadedly connected to the two blind plates, an annular groove is set on the opposite side of the two blind plates, a sealing ring is set in the groove, and a threaded hole for introducing gas is also set on the blind plate, and the sealing disk is threadedly connected to the blind plate through the threaded hole. Before the test, the expansion joint to be tested is placed between the two blind plates, and the spacing between the two blind plates is adjusted by the pull rod, so that the ring plates at both ends of the expansion joint to be tested are in close contact with the sealing ring, so that the two blind plates completely cover the two ends of the expansion joint through the sealing ring to achieve a sealing effect. Then, gas is introduced through the threaded hole, and finally the sealing disk is screwed into the threaded hole to achieve sealing.

[0004] However, when the inventors were implementing the invention, they found that the two blind plates were subjected to great force during the pressure test, which required that the blind plates and the sealing disks have sufficient thickness to withstand the pressure, which is very costly. In addition, the pressure test device has high requirements for lifting and installation conditions during installation and disassembly, making the operation extremely inconvenient, time-consuming and labor-intensive. Utility Model Content

[0005] The purpose of the embodiments of the present application is to provide a sealing device to solve the technical problems of existing large-diameter expansion joint sealing devices, such as high cost, time-consuming and labor-intensive installation and disassembly.

[0006] In order to solve the above technical problems, the embodiments of the present application provide the following technical solutions: including:

[0007] Two annular plates, the two annular plates are arranged parallel and opposite to each other along a first direction;

[0008] A first sealing structure, wherein the first surfaces of the two annular plates facing each other are both provided with the first sealing structure;

[0009] A second sealing structure, wherein the first sealing structure and the second sealing structure are arranged on a first surface of one of the annular plates in a spaced relationship, and the second sealing structure is closer to an axis of one of the annular plates relative to the first sealing structure;

[0010] a tube, one end of which is detachably and hermetically connected to one of the annular plates through the second sealing structure, and the other end of which is hermetically connected to the other annular plate;

[0011] Among them, the two annular plates can be detachably sealed and connected with the end plates at both ends of the object to be detected through the first sealing structure, so that the two annular plates, the tube and the object to be detected can form a closed space, and the closed space has a connecting part that can communicate with the outside, and the axial direction of the tube and the axial direction of the object to be detected are both the first direction.

[0012] In some modified implementations of the first aspect of the present application, the first sealing structure includes a first sealing ring and a first extrusion portion that are spaced apart;

[0013] The first sealing ring is fixedly arranged on the first surface and is coaxial with the annular plate, the first extrusion portion is threadedly connected to the annular plate, and the first extrusion portion is away from the axis of the annular plate relative to the first sealing ring;

[0014] The first sealing ring and the second sealing structure are spaced apart, and the second sealing structure is closer to an axis of the annular plate relative to the first sealing ring;

[0015] The first extrusion portion can cooperate with the annular plate to clamp a portion of the end plate of the object to be detected, so that the end plate of the object to be detected fits tightly with the first sealing ring.

[0016] In some embodiments, the first extrusion portion includes a connecting member and a pressing plate;

[0017] The connecting piece is away from the axis of the annular plate relative to the first sealing ring, the pressing plate is arranged in parallel between the two annular plates, and the connecting piece is threadedly connected to the annular plates;

[0018] The connecting member can adjust the distance between the annular plate and the pressing plate so that the pressing plate and the annular plate clamp a portion of the end plate of the object to be detected.

[0019] In some embodiments, the first extrusion portion further comprises a support member;

[0020] The support member is away from the axis of the annular plate relative to the connecting member, the support member is connected to or in contact with the annular plate, and the support member is connected to or in contact with the pressing plate.

[0021] In some embodiments, there are a plurality of the first extrusion parts, and the plurality of the first extrusion parts are arranged on the annular plate at equal intervals along a circumferential trajectory.

[0022] In some embodiments, the first sealing structure further includes a limiting portion;

[0023] The limiting portion is arranged on the first surface, the first sealing ring is fixedly arranged in the limiting portion, the limiting portion and the second sealing structure are spaced apart, and the limiting portion is used to limit the first sealing ring from moving in radial direction.

[0024] In some embodiments, the first sealing structure further comprises two metal rings;

[0025] The two metal rings are arranged on the first surface at intervals, the two metal rings are coaxial with the first sealing ring, the first sealing ring is fixedly arranged between the two metal rings, and the two metal rings form the limiting portion.

[0026] In some embodiments, the first surface is provided with an annular limiting groove, the limiting groove is coaxial with the first sealing ring, the first sealing ring is arranged in the limiting groove, and the limiting groove forms the limiting portion.

[0027] In some embodiments, the second sealing structure comprises a limiting plate, a second sealing ring and a second extrusion portion, the limiting plate is annular, one end of the tube is arranged on the first surface of the limiting plate, and the limiting plate is coaxial with the tube;

[0028] The second sealing ring is fixedly arranged on the first surface of one of the annular plates, the second sealing ring is coaxial with one of the annular plates, the second sealing ring and the first sealing ring are spaced apart, and the second sealing ring is closer to the axis of one of the annular plates relative to the first sealing ring;

[0029] The second extrusion portion is threadedly connected to one of the annular plates, and the second extrusion portion is close to the axis of one of the annular plates relative to the second sealing ring;

[0030] Wherein, the second extrusion portion can cooperate with one of the annular plates to clamp the limiting plate, so that the limiting plate and the second sealing ring are tightly fitted.

[0031] In some embodiments, the connecting portion is located on the tube or one of the annular plates.

[0032] Compared with the prior art, the sealing device provided by the present application, by setting two annular plates, the two annular plates can be detachably sealed and connected with the end plates at both ends of the object to be detected through the first sealing structure; and one end of the tube is detachably sealed and connected with an annular plate through the second sealing structure, and the other end of the tube is sealed and connected with another annular plate, and the second sealing structure is close to the axis of an annular plate relative to the first sealing structure, so that the two annular plates, the tube and the object to be detected can form a closed space, and since the diameter of the object to be detected is greater than its height, the contact area between the gas and the sealing device during the pressure test can be reduced by setting the tube and the two annular plates, thereby reducing the pressure on the sealing device during the pressure test, and due to the reduction in the pressure on the sealing device, the thickness of the two annular plates and the tube can be reduced during the design, thereby reducing the weight of the sealing device, reducing the production cost, and the installation and disassembly are more time-saving and labor-saving. In addition, since one end of the tube is detachably connected with an annular plate through the second sealing structure, the sealing device of the present application can be reused.

[0033] The sealing device of the present application reduces the contact area between the gas and the sealing device during pressure measurement by providing two annular plates and a tube, thereby reducing the weight of the sealing device, making the sealing device of the present application lower in cost and easier to install and disassemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present application will become easy to understand. In the accompanying drawings, several embodiments of the present application are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0035] Figure 1 The structural diagram of the sealing device of the present application is schematically shown;

[0036] Figure 2 Schematically shows Figure 1 A partial enlarged view of point D in the middle.

[0037] Description of Figure Numbers:

[0038] 1. annular plate; 2. first sealing structure; 21. first sealing ring; 22. first extrusion part; 221. connecting member; 222. pressure plate; 223. supporting member; 23. limiting part; 3. second sealing structure; 31. limiting plate; 32. second sealing ring; 33. second extrusion part; 4. tube; 5. object to be detected; 51. end plate. DETAILED DESCRIPTION

[0039] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0040] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which this application belongs.

[0041] The sealing device of the present application is applied to pressure testing of large-sized expansion joints. Other objects to be tested that can reduce the contact area between the gas and the sealing device by using the sealing device of the present application can also be pressure tested by using the sealing device of the present application.

[0042] like Figure 1 As shown, the present application provides a sealing device, comprising: two annular plates 1, the two annular plates 1 are arranged parallel and opposite to each other along a first direction;

[0043] A first sealing structure 2, wherein the first surfaces of the two annular plates 1 facing each other are both provided with the first sealing structure 2;

[0044] A second sealing structure 3, wherein the first sealing structure 2 and the second sealing structure 3 are arranged on a first surface of the annular plate 1, and the second sealing structure 3 is close to the axis of the annular plate 1 relative to the first sealing structure 2;

[0045] a tube 4, one end of which is detachably and hermetically connected to one of the annular plates 1 via the second sealing structure 3, and the other end of which is hermetically connected to the other annular plate 1;

[0046] Among them, the two annular plates 1 can be detachably sealed and connected to the end plates 51 at both ends of the object to be detected 5 through the first sealing structure 2, so that the two annular plates 1, the tube 4 and the object to be detected 5 can form a closed space, and the closed space has a connecting part that can communicate with the outside, and the axial direction of the tube 4 and the axial direction of the object to be detected 5 are both the first direction.

[0047] Specifically, the two annular plates 1 are used to be detachably sealed and connected to the end plates 51 at both ends of the object to be detected 5. The end plates 51 at both ends of the object to be detected 5 are perpendicular to the first direction. The two annular plates 1 can be coaxial or not. In order to reduce the weight of the two annular plates 1, the two annular plates 1 are preferably coaxial. The two annular plates 1 can be circular rings, elliptical rings or other ring shapes, and their specific shapes can be set according to the shapes of the end plates 51 at both ends of the object to be detected 5. The present application is mainly used for pressure testing of large-diameter expansion joints, so the present application preferably uses a circular annular plate 1.

[0048] The dimensions of the inner and outer circles of the two annular plates 1 are designed according to the caliber of the end plates at both ends of the object to be detected 5 and the height of the object to be detected 5. It should be noted that since the present application is mainly used for pressure testing of large-diameter expansion joints, the calibers at both ends of the large-diameter expansion joints are greater than the height. Therefore, during the design, the dimensions can be adjusted to ensure that the contact area between the two annular plates 1 and the tube 4 and the pressure test gas during the pressure test is smaller than the contact area between the two traditional blind plates and the pressure test gas. Since the pressure of the internal stamping during the pressure holding process is consistent, the bearing capacity of the sealing device is reduced by reducing the contact area between the gas and the sealing device during the pressure test. Therefore, compared with the two traditional blind plates, the thickness of the two annular plates 1 and the tube 4 can be designed to be thinner, thereby reducing the overall weight of the sealing device.

[0049] The first sealing structure 2 enables the end plates 51 at both ends of the object to be detected 5 to be detachably sealed and connected. The size of the first sealing structure 2 is designed according to the size of the caliber at both ends of the object to be detected 5. Since the size of the caliber at both ends of the object to be detected may be the same or different, that is, the size of the two first sealing structures 2 may be the same or different. The shape of the two first sealing structures 2 can also be designed according to the shape of the two ends of the object to be detected 5.

[0050] The first sealing structure 2 may include a first elastic member and a first fixing member. The first elastic member may be fixedly arranged on the first surface by gluing. The shape of the first elastic member may be designed according to the shapes of the end plates 51 at both ends of the object to be detected 5. The size of the first elastic member may be designed according to the size of the end plates 51 at both ends of the object to be detected 5. It is sufficient to ensure that the end plates 51 at both ends of the object to be detected 5 can contact with the first elastic member to achieve sealing.

[0051] The first fixing member can be detachably connected with the annular plate 1 and the end plate 51 by snapping, and the first fixing member may include a first fixing member and a second sub-first fixing member, the first sub-fixing member is fixedly arranged on the first surface, and the first sub-fixing member is away from the axis of the annular plate 1 relative to the contact point between the end plate 51 and the first elastic member, and the first sub-fixing member is provided with a threaded through hole along the radial direction of the object to be detected 5. During assembly, the annular plate 1 can be squeezed with the help of an external tool so that the threaded through hole is located on the side of the end plate 51 away from the annular plate 1, and then the second sub-fixing member is threadedly connected with the first sub-fixing member through the threaded through hole, and by rotating the first sub-fixing member, part of the second sub-fixing member can squeeze the end plate 51 to achieve the sealing of the object to be detected 5 and the annular plate 1, and the external tool can be removed at this time.

[0052] In order to ensure the sealing effect between the object to be detected 5 and the annular plate 1 , there can be multiple first fixing members, and multiple fixing members are arranged on the outside of the first sealing ring 21 . The specific number of first fixing members can be selected according to the size of the object to be detected 5 .

[0053] The second sealing structure 3 enables the end plates 51 at both ends of the object to be detected 5 to be detachably sealed and connected. The second sealing structure 3 may only include a second elastic member, and the specific structure of the second elastic member may refer to the first elastic member. When the object to be detected 5 is sealed and detachably connected with the two annular plates 1 through the second sealing structure 3, the second elastic member is tightly fitted with one end of the tube 4; or,

[0054] The second sealing structure 3 also includes a second fixing piece. A blind hole is provided on one end of the tube 4 close to the axis of the annular plate 1. The second fixing piece is clamped with the tube 4 through the blind hole. The specific structure and quantity of the second fixing piece can refer to the first fixing piece and will not be repeated here.

[0055] The tube 4 can form a closed space with the object to be detected 5 and the two annular plates 1, thereby realizing a pressure test. In order to further reduce the weight of the sealing device, the other end of the tube 4 can be arranged on the outside of the other annular plate 1, and the other end of the tube 4 can also be sealed and connected through the second sealing structure 3; or, when the tube 4 and the annular plate 1 are both made of metal, the other end of the tube 4 can be welded to the other annular plate 1, making assembly more time-saving and labor-saving.

[0056] The enclosed space has a connecting part connected to the outside, and the connecting part is used to introduce gas or liquid into the enclosed space to achieve pressure testing, and the connecting part can be closed after the gas or liquid is introduced to maintain the enclosed space in a sealed state. The specific setting method of the connecting part can refer to the setting method of the connecting part on the existing sealing device, which will not be repeated here.

[0057] Compared with the prior art, the sealing device provided by the present application is provided with two annular plates 1, and the two annular plates 1 can be detachably sealed and connected with the end plates 51 at both ends of the object to be detected 5 through the first sealing structure 2; and one end of the tube 4 is detachably sealed and connected with an annular plate 1 through the second sealing structure 3, and the other end of the tube 4 is sealed and connected with another annular plate 1, and the second sealing structure 3 is close to the axis of an annular plate 1 relative to the first sealing structure 2, so that the two annular plates 1, the tube 4 and the object to be detected 5 can form a closed space. Since the diameter of the object to be detected 5 is greater than its height, the contact area between the gas and the sealing device during the pressure test can be reduced by setting the tube 4 and the two annular plates 1, thereby reducing the pressure on the sealing device during the pressure test, and due to the reduction in the pressure on the sealing device, the thickness of the two annular plates 1 and the tube 4 can be reduced during the design, thereby reducing the weight of the sealing device, reducing the production cost, and the installation and disassembly are more time-saving and labor-saving. In addition, since one end of the tube 4 is detachably connected with an annular plate 1 through the second sealing structure 3, the sealing device of the present application can be reused.

[0058] The sealing device of the present application reduces the contact area between the gas and the sealing device during pressure measurement by providing two annular plates 1 and a tube 4, thereby reducing the weight of the sealing device, making the sealing device of the present application lower in cost and easier to install and disassemble.

[0059] like Figure 2 As shown, in some embodiments, the first sealing structure 2 includes a first sealing ring 21 and a first extrusion portion 22 that are spaced apart;

[0060] The first sealing ring 21 is fixedly disposed on the first surface and is coaxial with the annular plate 1. The first extrusion portion 22 is threadedly connected to the annular plate 1. The first extrusion portion 22 is away from the axis of the annular plate 1 relative to the first sealing ring 21.

[0061] The first sealing ring 21 and the second sealing structure 3 are arranged at intervals, and the second sealing structure 3 is close to an axis of the annular plate 1 relative to the first sealing ring 21;

[0062] The first extrusion portion 22 can cooperate with the annular plate 1 to clamp a portion of the end plate 51 of the object to be detected 5 , so that the end plate 51 of the object to be detected 5 is tightly fitted with the first sealing ring 21 .

[0063] like Figure 2 As shown, in some embodiments, the first extrusion portion 22 includes a connecting member 221 and a pressing plate 222;

[0064] The connecting member 221 is away from the axis of the annular plate 1 relative to the first sealing ring 21, the pressing plate 222 is arranged in parallel between the two annular plates 1, and the connecting member 221 is threadedly connected to the annular plates 1;

[0065] The connecting member 221 can adjust the distance between the annular plate 1 and the pressing plate 222 , so that the pressing plate 222 and the annular plate 1 clamp a portion of the end plate 51 of the object to be detected 5 .

[0066] Specifically, for the convenience of assembly, the first extrusion part 22 is threadedly connected to the annular plate 1. The connecting piece 221 of the first extrusion part 22 may include a nut, and either a bolt or a screw, wherein the bolt is preferred, the axis of the bolt is in the first direction, the bolt is away from the axis of the annular plate 1 relative to the first sealing ring 21, the bolt is threadedly connected to the annular plate 1, the bolt is threadedly connected to the nut, and the end plate 51 is located between the nut and the annular plate 1, and by rotating the nut, part of the nut can be squeezed to the end plate 51, thereby making the end plate 51 and the first sealing ring 21 fit tightly, thereby achieving the sealing of the object to be detected 5 and the annular plate 1.

[0067] In order to increase the contact area between the first extrusion part 22 and the end plate 51 and ensure the stability of the first extrusion part 22 during extrusion, the first extrusion part 22 also includes a pressing plate 222, and the bolt is threadedly connected to the annular plate 1 and is slidably connected to the pressing plate 222 along the first direction. By rotating the nut, part of the pressing plate 222 can be pressed against the end plate 51, so that the end plate 51 and the first sealing ring 21 are tightly fitted. Or,

[0068] The connecting member 221 can also be a screw, the axis of the screw is in the first direction, the threads at both ends of the screw are in opposite directions, the two ends of the screw are respectively threadedly connected to the annular plate 1 and the pressure plate 222, and the distance between the annular plate 1 and the pressure plate 222 can be adjusted by rotating the screw forward and backward.

[0069] like Figure 2 As shown, in some embodiments, the first extrusion portion 22 further includes a support member 223;

[0070] The support member 223 is away from the axis of the annular plate 1 relative to the connecting member 221 , the support member 223 is connected to or in contact with the annular plate 1 , and the support member 223 is connected to or in contact with the pressing plate 222 .

[0071] Specifically, the support member 223 can prevent the pressing plate 222 from tilting, so that the pressing plate 222 is subjected to a more uniform force, and the squeezing effect of the pressing plate 222 is ensured. The support member 223 can be a cushion block, which can be placed between the annular plate 1 and the pressing plate 222, or the cushion block is connected to the annular plate 1 and contacts the pressing plate 222 when the pressing plate 222 squeezes the end plate 51; or the cushion block is connected to the pressing plate 222 and contacts the annular plate 1 when the pressing plate 222 squeezes the end plate 51.

[0072] Alternatively, the structure of the support member 223 may be the same as that of the connecting member 221. In this case, the connection method between the support member 223 and the annular plate 1 and the pressure plate 222 can refer to the connection method between the connecting member 221 and the annular plate 1 and the pressure plate 222, which will not be repeated here.

[0073] In some embodiments, there are multiple connecting members 221, and the multiple connecting members 221 are arranged on the annular plate 1 at equal intervals along a circular trajectory.

[0074] Specifically, in order to ensure the sealing effect between the object to be detected 5 and the annular plate 1, there are multiple first extrusion parts 22, and the multiple first extrusion parts 22 are all arranged on the outside of the first sealing ring 21. The number of first extrusion parts 22 can be specifically designed according to the size of the object to be detected 5.

[0075] like Figure 2 As shown, in some embodiments, the first sealing structure 2 further includes a limiting portion 23;

[0076] The limiting portion 23 is disposed on the first surface, the first sealing ring 21 is fixedly disposed in the limiting portion 23, the limiting portion 23 is spaced apart from the second sealing structure 3, and the first limiting member is used to limit the radial movement of the first sealing ring 21.

[0077] The first sealing structure 2 also includes two metal rings;

[0078] The two metal rings are arranged on the first surface at an interval, the two metal rings are coaxial with the first sealing ring 21 , the first sealing ring 21 is fixedly arranged between the two metal rings, and the two metal rings form the limiting portion 23 .

[0079] In some embodiments, the first surface is provided with an annular limiting groove, the limiting groove is coaxial with the first sealing ring 21 , the first sealing ring 21 is arranged in the limiting groove, and the limiting groove forms the limiting portion 23 .

[0080] Specifically, the first sealing ring 21 can be fixed on the first surface by gluing. The limiting portion 23 can prevent the first sealing ring 21 from moving in the radial direction and deforming, thereby ensuring the sealing effect between the annular plate 1 and the object to be detected 5.

[0081] When the limiting parts 23 are two metal rings, the annular plate 1 can be made of metal. In this case, the two metal rings can be fixedly connected to the annular plate 1 by welding, which makes the processing simpler and more convenient, and the processing cost is lower.

[0082] When the limiting portion 23 is a limiting groove, the limiting groove can be processed by using existing mechanical equipment.

[0083] like Figure 2 As shown, in some embodiments, the second sealing structure 3 includes a limiting plate 31, a second sealing ring 32 and a second extrusion portion 33, the limiting plate 31 is annular, one end of the tube 4 is arranged on the first surface of the limiting plate 31, and the limiting plate 31 is coaxial with the tube 4;

[0084] The second sealing ring 32 is fixedly disposed on the first surface of one of the annular plates 1, the second sealing ring 32 is coaxial with one of the annular plates 1, the second sealing ring 32 and the first sealing ring 21 are spaced apart, and the second sealing ring 32 is closer to the axis of one of the annular plates 1 relative to the first sealing ring 21;

[0085] The second extrusion portion 33 is threadedly connected to one of the annular plates 1, and the second extrusion portion 33 is close to the axis of one of the annular plates 1 relative to the second sealing ring 32;

[0086] The second extrusion portion 33 can cooperate with one of the annular plates 1 to clamp the limiting plate 31 , so that the limiting plate 31 and the second sealing ring 32 fit tightly.

[0087] Specifically, the stop plate 31 and the tube 4 can both be made of metal, and the stop plate 31 and the tube 4 can be connected by welding. The specific configuration of the second sealing ring 32 can refer to the first sealing ring 21, and the specific structure and connection method of the second extrusion part 33 can refer to the first extrusion part 22.

[0088] The second sealing structure 3 realizes a detachable sealed connection between the tube 4 and the annular plate 1, which is beneficial to the reuse of the sealing device of the present application and is easier to operate.

[0089] In some embodiments, the connecting portion is located on the tube 4 or one of the annular plates 1 .

[0090] Specifically, the specific position of the connecting part can be selected according to actual needs, which is more flexible.

[0091] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A sealing device, characterized in that: include: Two annular plates, the two annular plates are arranged parallel and opposite to each other along a first direction; A first sealing structure, wherein the first surfaces of the two annular plates facing each other are both provided with the first sealing structure; A second sealing structure, wherein the first sealing structure and the second sealing structure are arranged on a first surface of one of the annular plates in a spaced relationship, and the second sealing structure is closer to an axis of one of the annular plates relative to the first sealing structure; a tube, one end of which is detachably and hermetically connected to one of the annular plates through the second sealing structure, and the other end of which is hermetically connected to the other annular plate; Among them, the two annular plates can be detachably sealed and connected with the end plates at both ends of the object to be detected through the first sealing structure, so that the two annular plates, the tube and the object to be detected can form a closed space, and the closed space has a connecting part that can communicate with the outside, and the axial direction of the tube and the axial direction of the object to be detected are both the first direction.

2. The sealing device according to claim 1, characterized in that: The first sealing structure comprises a first sealing ring and a first extrusion portion which are arranged at intervals; The first sealing ring is fixedly arranged on the first surface and is coaxial with the annular plate, the first extrusion portion is threadedly connected to the annular plate, and the first extrusion portion is away from the axis of the annular plate relative to the first sealing ring; The first sealing ring and the second sealing structure are spaced apart, and the second sealing structure is closer to an axis of the annular plate relative to the first sealing ring; The first extrusion portion can cooperate with the annular plate to clamp a portion of the end plate of the object to be detected, so that the end plate of the object to be detected fits tightly with the first sealing ring.

3. The sealing device according to claim 2, characterized in that: The first extrusion portion includes a connecting member and a pressing plate; The connecting piece is away from the axis of the annular plate relative to the first sealing ring, the pressing plate is arranged in parallel between the two annular plates, and the connecting piece is threadedly connected to the annular plates; The connecting member can adjust the distance between the annular plate and the pressing plate so that the pressing plate and the annular plate clamp a portion of the end plate of the object to be detected.

4. The sealing device according to claim 3, characterized in that: The first extrusion portion further includes a support member; The support member is away from the axis of the annular plate relative to the connecting member, the support member is connected to or in contact with the annular plate, and the support member is connected to or in contact with the pressing plate.

5. The sealing device according to claim 2, characterized in that: There are a plurality of first extrusion parts, and the plurality of first extrusion parts are arranged on the annular plate at equal intervals along a circumferential trajectory.

6. The sealing device according to claim 2, characterized in that: The first sealing structure further includes a limiting portion; The limiting portion is arranged on the first surface, the first sealing ring is fixedly arranged in the limiting portion, the limiting portion and the second sealing structure are spaced apart, and the limiting portion is used to limit the first sealing ring from moving in radial direction.

7. The sealing device according to claim 6, characterized in that: The first sealing structure also includes two metal rings; The two metal rings are arranged on the first surface at intervals, the two metal rings are coaxial with the first sealing ring, the first sealing ring is fixedly arranged between the two metal rings, and the two metal rings form the limiting portion.

8. The sealing device according to claim 6, characterized in that: The first surface is provided with an annular limiting groove, the limiting groove is coaxial with the first sealing ring, the first sealing ring is arranged in the limiting groove, and the limiting groove forms the limiting portion.

9. The sealing device according to claim 2, characterized in that: The second sealing structure comprises a limit plate, a second sealing ring and a second extrusion portion, the limit plate is annular, one end of the tube is arranged on the first surface of the limit plate, and the limit plate is coaxial with the tube; The second sealing ring is fixedly disposed on the first surface of one of the annular plates, the second sealing ring is coaxial with one of the annular plates, the second sealing ring and the first sealing ring are spaced apart, and the second sealing ring is closer to the axis of one of the annular plates relative to the first sealing ring; The second extrusion portion is threadedly connected to one of the annular plates, and the second extrusion portion is close to the axis of one of the annular plates relative to the second sealing ring; Wherein, the second extrusion portion can cooperate with one of the annular plates to clamp the limiting plate, so that the limiting plate and the second sealing ring are tightly fitted.

10. The sealing device according to claim 1, characterized in that: The communication portion is located on the tube or one of the annular plates.

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