Sealing device

Abstract

The utility model provides a sealing device, which comprises a gland, a sealing ring and a sealing ring, and is characterized in that the gland comprises a hollow cylindrical main body part and a flange part; the flange part is integrally arranged on the periphery of the main body part; the flange part is integrally arranged on the periphery of the main body part; the end cover is arranged at the bottom of the gland and is connected with the gland through a connecting piece; wherein a to-be-detected workpiece is located between the gland and the end cover; the workpiece to be detected is hollow; the to-be-detected workpiece comprises an upper workpiece and a lower workpiece which are stacked up and down, and the upper workpiece and the lower workpiece are welded and connected; the top and the inner surface of the upper workpiece are in pressing contact with the flange part through the upper sealing piece in the axial direction of the gland and in the radial direction of the gland respectively; and the top and the inner surface of the lower workpiece are in pressing contact with the main body part through a lower sealing piece in the axial direction of the gland and in the radial direction of the gland respectively.

Description

Technical Field

[0001] The present application relates to fields such as nuclear power, and in particular to a sealing device. Background Art

[0002] The control rod drive mechanism (CRDM) of the reactor is an important servo mechanism in the reactor control and protection system. The main function of the control rod drive mechanism is to drive the control rod assembly to move up and down in the core according to the command to keep the control rod assembly at the command height, or to release the control rod assembly by power failure so that it can be quickly inserted into the core under the action of gravity, so as to complete the functions of reactor startup, power regulation, power maintenance, normal shutdown and accident shutdown.

[0003] Usually, CRDM is composed of dozens of control rod assemblies, which are distributed on the top cover of the pressure vessel in a closely arranged manner. The upper and lower parts of the control rod assembly are also called the upper assembly and the lower assembly. The upper and lower assemblies are connected by a sealing weld, and the sealing weld adopts a specially designed structure, called a Canopy sealing weld or an Ω weld. This type of sealing weld belongs to the nuclear safety level I weld, is a component of the pressure boundary of the reactor primary loop system, and is related to the safe operation of the entire reactor.

[0004] Since the Canopy weld is easily exposed to high temperature, high pressure and irradiation for a long time, if it leaks, it will directly affect the integrity of the circuit and will also affect the top cover and its accessories, thus affecting the safety of the reactor equipment. Therefore, in the prior art, an O-shaped rubber sealing ring is used in combination with a sealing retaining ring in a radial sealing form to ensure the sealing performance of the Canopy weld.

[0005] This solution is only suitable for the case where the height dimension of the sealing part (i.e., the product design dimension) is relatively large. In this way, there is enough installation space at the bottom of the O-shaped rubber sealing ring to accommodate the sealing retaining ring, thereby further improving the sealing effect of the O-shaped rubber sealing ring. However, when the height dimension of the sealing part is limited, if the O-shaped rubber sealing ring is still used in conjunction with the sealing retaining ring and in the form of radial sealing, the height of the groove area where the O-shaped rubber sealing ring and the sealing retaining ring are located almost accounts for the vast majority of the height of the sealing part, which will make it impossible to fully envelop the groove area. If only a single O-shaped rubber sealing ring is used for sealing, the O-shaped rubber sealing ring cannot meet the requirement of withstanding high pressure.

[0006] Therefore, it is necessary to propose solutions to the problems of the prior art. Utility Model Content

[0007] The present application is aimed at the situation in the prior art that a workpiece to be inspected has no space for installing a sealing retaining ring and cannot withstand high pressure if only a single O-ring is used for sealing. The present application provides a sealing device which adopts a double sealing form of axial sealing and radial sealing to achieve high-pressure sealing.

[0008] The present application provides a sealing device, the sealing device comprising:

[0009] a gland, the gland comprising a main body portion in a hollow cylindrical shape and a flange portion; the flange portion is integrally arranged on the outer periphery of the main body portion; and

[0010] An end cover, which is arranged at the bottom of the gland and connected to the gland via a plurality of connectors;

[0011] Wherein, a workpiece to be detected is located between the pressure cover and the end cover; the workpiece to be detected is hollow; the workpiece to be detected includes an upper workpiece and a lower workpiece stacked up and down, and the upper workpiece and the lower workpiece are welded together;

[0012] Among them, the top and the inner surface of the upper workpiece are respectively pressed and contacted with the flange part along the axial direction of the pressure cover and along the radial direction of the pressure cover through the upper seal; the top and the inner surface of the lower workpiece are respectively pressed and contacted with the main body part along the axial direction of the pressure cover and along the radial direction of the pressure cover through the lower seal.

[0013] Furthermore, the main body portion includes a first main body portion and a second main body portion stacked up and down; the flange portion includes a first flange portion and a second flange portion stacked up and down; and the flange portion is integrally arranged on the outer periphery of the first main body portion.

[0014] In some embodiments of the present application, a groove is provided at the bottom of the first flange portion, and the top of the upper workpiece is inserted into the interior of the groove.

[0015] In some embodiments of the present application, the upper workpiece is arranged at intervals along the outer peripheral surface of the first main body, and an arc groove is provided on the top of the lower workpiece; the inner surface of the upper workpiece, the arc groove surface of the lower workpiece and the outer peripheral surface of the first main body are combined to form a cavity, and the cavity is used to inject liquid to detect the weld area formed by the welding of the upper workpiece and the lower workpiece, wherein the weld area is exposed to the cavity.

[0016] In some embodiments of the present application, a liquid inlet is provided on one side of the top of the first main body, and the liquid inlet is configured to be connected to an injection tube of an external injection device, and the liquid inlet is connected to the cavity through a pipeline provided on the first main body.

[0017] In some embodiments of the present application, an exhaust port is further provided on one side of the top of the first main body portion, and the exhaust port and the liquid inlet are arranged opposite to each other along the axial direction of the pressure cover, and the exhaust port is not arranged lower than the liquid inlet in the axial direction of the pressure cover; the exhaust port is configured as an air hole plug inserted therein.

[0018] In some embodiments of the present application, along the axial direction of the pressure cover, there is a first distance between the bottom surface of the pressure cover and the bottom surface of the workpiece to be inspected, and the first distance is 0-0.05 mm.

[0019] In some embodiments of the present application, along the axial direction of the gland, there is a second spacing between the bottom surface of the groove in the first flange portion of the gland and the bottom plane of the first main body portion of the gland, and there is a third spacing between the top plane of the upper workpiece and the top plane of the lower workpiece, and the relationship between the second spacing and the third spacing is:

[0020] The third spacing -0.03mm<the second spacing<the third spacing+0.03mm.

[0021] In some embodiments of the present application, the upper seal and the lower seal are annular sealing rings.

[0022] In some embodiments of the present application, the end cover is in the shape of a hollow cylinder, and the multiple connecting members are evenly distributed along the circumferential direction of the end cover.

[0023] In the embodiment of the present application, a sealing device is provided, which adopts a combination of axial sealing and radial sealing to achieve the cavity described in this article to withstand a certain high pressure (>10MPa) for the workpiece to be detected without a sealing retaining ring installation space in the prior art. If only a single O-shaped rubber sealing ring is used for sealing, it cannot withstand high pressure. Further, the sealing device adopts a connection method of multiple connectors to clamp and seal the workpiece to be detected. This method is highly operable and can be reused. Moreover, the top of the workpiece to be detected is inserted into the groove of the gland in the sealing device to control the deformation of the workpiece to be detected during the clamping process, thereby ensuring the reliability of the seal. In addition, the main body and end cover of the gland in the sealing device adopt a hollow cylindrical structure, which can not only control its own weight, but also make the cavity formed by the gland and the workpiece to be detected a relatively small space, thereby shortening the time of liquid injection and pressurization in the cavity. The sealing device provided in the embodiment of the present application can achieve the effect of high-pressure sealing for workpieces with complex shapes and small height dimensions of the sealing part. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 It is a three-dimensional cross-sectional schematic diagram of a sealing device in an embodiment of the present application.

[0026] Figure 2 It is a two-dimensional cross-sectional schematic diagram of a sealing device in an embodiment of the present application.

[0027] Figure 3 It is a cross-sectional schematic diagram of a gland in one embodiment of the present application.

[0028] Figure 4 It is a cross-sectional schematic diagram of an end cover in one embodiment of the present application.

[0029] Figure 5 It is a schematic cross-sectional view of a workpiece to be inspected in one embodiment of the present application.

[0030] Fig. 6A Schematic diagram of a pressure hull test sample in one embodiment of the present application.

[0031] Figure 6B for Fig. 6A A partial enlarged schematic diagram of the Canopy weld is shown.

[0032] Fig. 7A and Figure 7B They are schematic diagrams of the annular inner holes of the gland and the end cover in one embodiment of the present application.

[0033] Figure 8 It is a schematic structural diagram of the groove of the lower workpiece in one embodiment of the present application.

[0034] Fig. 9 Schematic diagram of limiting dimension A and limiting dimension B.

[0035] Fig. 10A This is a schematic diagram of the ideal installation situation of the gland, end cover and the workpiece to be inspected.

[0036] Fig. 10B for Fig. 10A A local enlarged schematic diagram of area I is shown.

[0037] Fig.11A A schematic diagram of an example of a non-ideal installation situation of a gland, an end cap and a workpiece to be inspected.

[0038] Fig. 11B for Fig.11AA local enlarged schematic diagram of area II is shown.

[0039] Fig. 12A A schematic diagram of another example of a non-ideal installation situation of a gland, an end cap and a workpiece to be inspected.

[0040] Fig. 12B for Fig. 12A A local enlarged schematic diagram of area III is shown.

[0041] Fig.13A This is a schematic diagram of another example of a non-ideal installation situation of the pressure cover, the end cover and the workpiece to be inspected.

[0042] Fig. 13B for Fig.13A A local enlarged schematic diagram of region IV is shown. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application and are not used to limit the present application. In the present application, unless otherwise stated, the directional words used, such as "up", "down", "left", and "right", generally refer to the upper, lower, left, and right of the device in actual use or working state, specifically the drawing direction in the accompanying drawings.

[0044] A sealing device is provided in an embodiment of the present application, and the sealing device includes: a gland, the gland includes a main body portion and a flange portion in a hollow cylindrical shape; the flange portion is integrally arranged on the outer periphery of the first main body portion; and an end cover, the end cover is arranged at the bottom of the gland, and the end cover is connected to the gland through a plurality of connectors; wherein a workpiece to be detected is located between the gland and the end cover; the workpiece to be detected is hollow; the workpiece to be detected includes an upper workpiece and a lower workpiece stacked up and down, and the upper workpiece and the lower workpiece are welded together; wherein the top and the inner surface of the upper workpiece are respectively pressed and contacted with the flange portion through the upper sealing member and along the axial direction of the gland and along the radial direction of the gland; the top and the inner surface of the lower workpiece are respectively pressed and contacted with the main body portion through the lower sealing member and along the axial direction of the gland and along the radial direction of the gland (or referred to as tight fit, the same below).

[0045] In the embodiment of the present application, a sealing device is provided, which is aimed at the situation in the prior art that the workpiece to be detected without a sealing retaining ring installation space is sealed with only a single O-shaped rubber sealing ring and cannot withstand high pressure. A combination of axial sealing and radial sealing is adopted to achieve that the cavity described in this article can withstand a certain high pressure (>10MPa). Further, the sealing device adopts a plurality of bolt connection methods to clamp and seal the workpiece to be detected. This method is highly operable and can be reused. Moreover, the top of the workpiece to be detected is inserted into the groove of the gland in the sealing device to control the deformation of the workpiece to be detected due to pressure and expansion during the clamping process, thereby ensuring the reliability of the seal. In addition, the main body and end cover of the gland in the sealing device adopt a hollow cylindrical structure, which can not only control its own weight, but also make the cavity formed by the gland and the workpiece to be detected a relatively small space, thereby shortening the time of liquid injection and pressurization in the cavity.

[0046] The sealing device provided in the embodiments of the present application will be described in detail below. It should be noted that the description order of the following embodiments is not intended to limit the preferred order of the embodiments of the present application. In the following embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0047] See also Figures 1 to 13B As shown, the sealing device includes a gland 10 and an end cap 20 .

[0048] Specifically, the gland 10 includes a main body 11 and a flange 12. The main body 11 is in the shape of a hollow cylinder. Further, the main body 11 includes a first main body 111 and a second main body 112 stacked up and down, as shown in FIG. Figure 2 and Figure 3 As shown, the first main body portion 111 and the second main body portion 112 are an integral structure, and the outer diameter of the first main body portion 111 is greater than the outer diameter of the second main body portion 112. The flange portion 12 is integrally arranged on the outer periphery of the main body portion 11, specifically, the flange portion 12 is located on the outer periphery of the first main body portion 111. Further, the flange portion 12 includes a first flange portion 121 and a second flange portion 122 stacked up and down, and the first flange portion 121 and the second flange portion 122 are an integral structure. Among them, the first flange portion 121 protrudes outward more than the second flange portion 122 in the radial direction of the gland 10. As shown Fig. 7A As shown, the gland 10 may be an annular flange structure.

[0049] The end cover 20 is disposed at the bottom of the gland 10, and the end cover 20 is in a hollow cylindrical shape. Figure 4As shown, in this embodiment, the end cover 20 includes a third main body 210 and a fourth main body 220 stacked up and down, the third main body 210 and the fourth main body 220 are an integral structure, and the outer diameter of the third main body 210 is smaller than the outer diameter of the fourth main body 220. Specifically, the outer peripheral surface of the third main body 210 along the axial direction of the end cover 20 is in contact with the inner surface of the second main body 112. Figure 7B As shown, the end cover 20 may be an annular flange structure.

[0050] The end cover 20 is connected to the gland 10 via a plurality of connectors 430. In this embodiment, the connector 430 may be a bolt, that is, the end cover 20 may be connected to the gland 10 via a plurality of bolts. Furthermore, a plurality of bolts are evenly distributed along the circumferential direction of the end cover 20 to clamp the workpiece to be tested as described below, thereby improving the overall sealing effect. This method is highly operable and can be reused. In other embodiments, the connector 430 may also be other components that play a role in connection and tightening.

[0051] like Figure 1 and Figure 2 As shown, a workpiece 30 to be inspected is located between the pressure cover 10 and the end cover 20. The workpiece 30 to be inspected is hollow. The workpiece 30 to be inspected includes an upper workpiece 310 and a lower workpiece 320. Figure 5 The virtual frame shown in the figure is shown in the figure, and the upper workpiece 310 and the lower workpiece 320 are welded together. It should be noted that, in order to facilitate a better understanding of the structures of the gland 10, the end cover 20 and the workpiece 30 to be inspected, the gland 10 is divided into a first main body portion 111, a second main body portion 112, a first flange portion 121 and a second flange portion 122, the end cover 20 is divided into a third main body portion 210 and a fourth main body portion 220, and the workpiece 30 to be inspected is divided into an upper workpiece 310 and a lower workpiece 320, and in Figures 3 to 5 The approximate position is shown in the form of a dotted frame. Fig. 6A As shown, the workpiece 30 to be tested can be a pressure shell test sample (hereinafter referred to as the pressure shell, the same below). The test pressure value of the pressure shell test sample is 22.8Mpa. The weld of the pressure shell is a Canopy weld, such as Figure 6B In addition, it is worth noting that, during the process of installing the pressure hull between the gland 10 and the end cover 20, the gland 10 should be pressed into the pressure hull slowly and steadily to avoid scratching the inner surface of the pressure hull due to the use of hard force on the gland 10.

[0052] In this embodiment, the top and the inner surface of the upper workpiece 310 are respectively pressed and contacted with the flange portion 12 along the axial direction of the gland 10 and along the radial direction of the gland 10 through the upper seal 410. The upper seal 410 includes a first upper seal 411 and a second upper seal 412. Figure 1 and Figure 2 As shown. Furthermore, the top of the upper workpiece 310 is pressed and contacted with the first flange portion 121 along the axial direction of the gland 10 through the first upper seal 411, thereby achieving an upper axial seal. The inner surface of the upper workpiece 310 is pressed and contacted with the joint of the first flange portion 121 and the second flange portion 122 along the radial direction of the gland 10 through the second upper seal 412, thereby achieving an upper radial seal. Of course, in other embodiments, the inner surface of the upper workpiece 310 is pressed and contacted with the first flange portion 121 along the radial direction of the gland 10 through the second upper seal 412, which is not limited here.

[0053] The top and the inner surface of the lower workpiece 320 are respectively pressed and contacted with the main body 11 along the axial direction of the gland 10 and along the radial direction of the gland 10 through the lower seal 420. The lower seal 420 includes a first lower seal 421 and a second lower seal 422. Figure 1 and Figure 2 As shown, the top of the lower workpiece 320 is pressed and contacted with the first main body 111 along the axial direction of the gland 10 through the first lower seal 421, thereby achieving lower axial sealing. The inner surface of the lower workpiece 320 is pressed and contacted with the second main body 112 along the radial direction of the gland 10 through the second lower seal 422, thereby achieving lower radial sealing.

[0054] The upper seal 410 and the lower seal 420 are annular seals (or O-rings). In other words, in this embodiment, the first upper seal 411, the second upper seal 412, the first lower seal 421 and the second lower seal 422 are all annular seals. Figure 8 A first lower seal 421 is shown.

[0055] Since the sealing device described in the present application adopts a combination of axial sealing and radial sealing, the cavity 440 described below can withstand a certain high pressure (which may be greater than 10 MPa).

[0056] Combined with reference Figure 3As shown, in one embodiment of the present application, a groove 123 is provided at the bottom of the first flange portion 121, and the top of the upper workpiece 310 is inserted into the groove 123. In this way, after the top of the workpiece 30 to be inspected is inserted into the groove 123 of the gland 10 in the sealing device, the workpiece 30 to be inspected can be prevented from being deformed by pressure and expanding outwards during the clamping process, thereby affecting the sealing performance.

[0057] Continue reading Figure 1 and Figure 2 As shown, in one embodiment of the present application, the upper workpiece 310 is arranged at intervals along the outer peripheral surface of the first main body 111, and the top of the lower workpiece 320 is provided with an arc groove 321, as shown in FIG. Figure 8 In this embodiment, the arc groove 321 is an annular arc groove. Figure 1 and Figure 2 The inner surface of the upper workpiece 310, the arc groove surface of the lower workpiece 320 and the outer peripheral surface of the first main body 111 enclose a cavity 440, and the cavity 440 is used to inject liquid to detect the weld area (or weld position) formed by the welding of the upper workpiece 310 and the lower workpiece 320, wherein the weld area (or weld position) is at least exposed to the cavity 440. The following will further describe how to detect the weld area (or weld position) formed by the welding of the upper workpiece 310 and the lower workpiece 320, such as Fig. 6A and Figure 6B Canopy weld shown.

[0058] Here, it should be noted that since the main bodies of the pressure cover 10 and the end cover 20 are designed to be hollow cylindrical, this structural design can not only control the weight of the pressure cover 10 and the end cover 20, but also the cavity 440 formed by the pressure cover 10 and the end cover 20 and the workpiece 30 to be inspected can be a relatively small space. Even by adjusting the distance between the inner surface of the upper workpiece 310 and the outer peripheral surface of the first main body 111 or the size of the arc groove 321 of the lower workpiece 320, the space of the cavity 440 can be minimized, thereby shortening the time for liquid injection and pressurization in the cavity 440.

[0059] In addition, it should be noted that the pressure cover 10 and the end cover 20 are in direct contact with the workpiece 30 to be inspected. In the present embodiment, the materials of the pressure cover 10 and the end cover 20 may include but are not limited to stainless steel, and corresponding ultrasonic flaw detection is performed on the raw materials of the pressure cover 10 and the end cover 20 to avoid the influence of material defects on the test.

[0060] Continue reading Figure 1 and Figure 2As shown, a liquid inlet 124 is provided on one side of the top of the first main body 111, and the liquid inlet 124 is configured to be connected to a liquid injection tube 401 of an external liquid injection device (not shown in the figure). Further, the liquid inlet 124 can be spot-welded to the liquid injection tube 401 of the liquid injection device. The liquid inlet 124 is connected to the cavity 440 through a pipe 125 provided on the first main body 111. In this embodiment, the liquid injection tube 401 can be a thin tube with an inner diameter of 6 mm and an outer diameter of 14 mm. Of course, the specific size of the liquid injection tube 401 can be designed as needed.

[0061] like Figure 3 As shown, the shape (here, the cross-sectional shape) of the pipe 125 is L-shaped. Of course, the cross-sectional shape of the pipe 125 is not limited thereto, and may also be a straight line, for example.

[0062] Furthermore, an exhaust port 126 is provided on one side of the top of the first main body portion 111, and the exhaust port 126 and the liquid inlet 124 are arranged opposite to each other along the axial direction of the gland 10. The exhaust port is arranged not lower than the liquid inlet in the axial direction of the gland, so as to exhaust the air in the cavity as much as possible. In this embodiment, the exhaust port 126 and the liquid inlet 124 are symmetrically arranged along the axial direction of the gland 10. Furthermore, the pore diameter of the exhaust port 126 is 11 mm. Of course, the specific size of the exhaust port 126 can be designed as needed. Continue reading Figure 1 and Figure 2 As shown, the exhaust port 126 can be configured as an air hole plug 127 inserted therein. Further, the exhaust port 126 adopts a pipe thread sealing head structure, which is convenient for installation and disassembly.

[0063] Combination Figure 1 , Figure 2 and Figure 8 As shown, in this embodiment, the injection device can be a test water press, which injects clean water into the cavity 440 through the injection pipe 401 and through the liquid inlet 124 and the pipe 125 built into the first main body 111. At this time, the air in the cavity 440 can be discharged from the exhaust port 126, and then the clean water gradually fills the cavity 440. Subsequently, the air hole plug 127 is tightened to the exhaust port 126, and the clean water is continued to be injected into the cavity 440 through the test water press to complete the pressure increase, pressure maintenance, and pressure reduction series of tests. In other embodiments, the injection device can inject other liquids into the cavity 440, not limited to clean water.

[0064] It should be noted that the above-mentioned pressure increase refers to the continuous injection of clean water into the cavity 440 after the clean water is filled in the cavity 440 and the pore plug 127 is tightened to the exhaust port 126 to increase the water pressure value in the cavity 440. Maintaining pressure refers to raising the water pressure value in the cavity 440 to a preset detection value and maintaining it for a certain time (e.g., 30 minutes). Depressurization refers to gradually loosening the pore plug 127 after the water pressure value in the cavity 440 reaches the preset detection value to reduce the water pressure value in the cavity 440. In the entire series of tests of pressure increase, pressure maintenance, and pressure reduction, the user can check whether the weld area (or weld position) formed by the welding of the upper workpiece 310 and the lower workpiece 320 has surface penetration. After completing the preliminary test, it is necessary to continue to perform visual inspection and liquid penetration detection on the weld area (or weld position) to determine whether the weld area (or weld position) formed by the welding of the upper workpiece 310 and the lower workpiece 320 meets the required sealing performance. The visual inspection and liquid penetration inspection here are conventional inspection methods used by those skilled in the art and will not be described in detail here.

[0065] Before the above series of tests are performed, the connecting member 430 between the gland 10 and the end cover 20 (for example, in this embodiment, the connecting member 430 is a bolt, such as Figure 2 The test piece (as shown) should be pre-tightened to prevent leakage of high-pressure water column during the test.

[0066] In one embodiment of the present application, along the axial direction of the gland 10, the bottom surface of the gland 10 (eg Figure 3 N surface shown in FIG. 1 ) and the bottom surface of the workpiece 30 to be inspected (as shown in FIG. Figure 5 There is a first spacing between the M surface shown in the figure, and the first spacing is 0-0.05mm. In this way, it can be prevented that "when the workpiece 30 to be inspected is installed between the gland 10 and the end cover 20, and the bolts between the gland 10 and the end cover 20 are tightened, the bottom surface of the gland 10 (such as Figure 3 N surface shown in FIG. 1 ) and the bottom surface of the workpiece 30 to be inspected (such as Figure 5 When the first upper seal 411 and the first lower seal 421 are pressed into contact (or tightly fitted), there may be a large gap (such as the M surface shown in FIG. 1 ) between the axial sealing contact surface C between the bottom end surface of the first upper seal 411 and the top end surface of the upper workpiece 310 and the axial sealing contact surface D between the bottom end surface of the first lower seal 421 and the top end surface of the lower workpiece 320. Fig. 11B , Fig. 12B as well as Fig. 13B The gap E or gap F shown in the figure results in insufficient compression of the O-ring, and thus the effect of high sealing performance cannot be achieved", thereby ensuring the reliability of the axial seals at the above two positions (axial sealing contact surface C and axial sealing contact surface D).

[0067] In one embodiment of the present application, along the axial direction of the gland 10, there is a second distance between the bottom surface of the groove 123 in the first flange portion 121 of the gland 10 and the bottom plane of the first main body portion 111 of the gland 10 (i.e., Figure 3 The top plane of the upper workpiece 310 and the top plane of the lower workpiece 320 have a third distance (ie, as shown in FIG. Figure 5 The relationship between the second spacing Q and the third spacing P is: the third spacing P-0.03mm<the second spacing Q<the third spacing P+0.03mm. In this way, it can prevent the situation that "when the workpiece 30 to be inspected is installed between the gland 10 and the end cover 20, and the bolts between the gland 10 and the end cover 20 are tightened, when one of the positions of the axial sealing contact surface C between the bottom end face of the first upper seal 411 and the top end face of the upper workpiece 310 and the axial sealing contact surface D between the bottom end face of the first lower seal 421 and the top end face of the lower workpiece 320 is in tight contact, then there may be a large gap at the other position, thus causing insufficient compression of the O-ring, and thus failing to achieve a sealing effect", thereby ensuring the reliability of the axial sealing at the above two positions (axial sealing contact surface C and axial sealing contact surface D).

[0068] It is worth noting that in the actual design process, it is necessary to simultaneously meet the following two conditions: "along the axial direction of the pressure cover 10, there is a first spacing between the bottom surface of the pressure cover 10 and the bottom surface of the workpiece 30 to be inspected, and the first spacing is 0-0.05mm" and "along the axial direction of the pressure cover 10, there is a second spacing between the bottom surface of the groove 123 in the first flange portion 121 of the pressure cover 10 and the bottom plane of the first main body portion 111 of the pressure cover 10, and there is a third spacing between the top plane of the upper workpiece 310 and the top plane of the lower workpiece 320, and the relationship between the second spacing and the third spacing is: third spacing -0.03mm<second spacing<third spacing+0.03mm". If any of the above conditions is not met, the above-mentioned adverse situation may occur.

[0069] In order to better understand the above two embodiments, further explanation will be given below in conjunction with the accompanying drawings, wherein the workpiece 30 to be inspected is a pressure hull test sample.

[0070] Let "the bottom surface of the gland 10 is 0 to 0.05 mm lower than the bottom surface of the pressure shell" be the limiting dimension A (e.g. Fig. 9 The reference numeral A shown in FIG. 1 is shown in FIG. 1 , and the second spacing Q is controlled within the third spacing P ± 0.03 mm. The limiting dimension B is as follows (eg Fig. 9The second spacing is defined as Q between the bottom surface of the groove 123 in the first flange portion 121 of the gland 10 and the bottom plane of the first main body portion 111 of the gland 10. Figure 3 There is a third spacing between the top plane of the upper workpiece 310 and the top plane of the lower workpiece 320, and the third spacing is defined as P, such as Figure 5 The symbol P is shown.

[0071] When the gland 10, the end cap 20 and the workpiece 30 to be inspected are ideally installed (the limit dimensions A and B are met at this time), as Fig. 10A and Fig. 10B As shown, the upper axial sealing contact surface (such as Fig. 10A The axial seal contact surface C shown in the figure and the lower axial seal contact surface (as shown in the figure Fig. 10A The axial sealing contact surface D) shown in the figure fits each other (theoretical gap ≤ 0.03mm, wherein the theoretical gap refers to the gap between the upper axial sealing contact surface and the lower axial sealing contact surface, and the gap is very small, and the effect on the compression of the O-ring rubber sealing ring can be ignored), thereby ensuring the reliability of the axial sealing at the above two positions (i.e., the axial sealing contact surface C and the axial sealing contact surface D).

[0072] When the gland 10, the end cap 20 and the workpiece 30 to be inspected are not installed in an ideal manner (at this time, the limit dimension A is not subject to tolerance restriction), if the limit dimension A is too large, the following may occur: Fig.11A and Fig. 11B As shown in the figure, there is a large gap between the upper axial sealing contact surface C and the lower axial sealing contact surface D (such as Fig. 11B The gap E / F shown in the figure causes the O-rings at these positions (i.e., the axial sealing contact surface C and the axial sealing contact surface D) to be insufficiently compressed, thereby failing to achieve a high sealing effect.

[0073] When the gland 10, the end cap 20 and the workpiece 30 to be inspected are not installed in an ideal manner (at this time, the limit dimension B is not subject to tolerance restriction), if the limit dimension B is too large (i.e., Q>P+0.03mm), the following may occur: Fig. 12A and Fig. 12B As shown in the figure, there is a large gap between the upper axial sealing contact surface C (such as Fig. 12B The gap E) shown in the figure causes the O-ring at this position (i.e., the upper axial sealing contact surface C) to be insufficiently compressed, thereby failing to achieve a high sealing effect.

[0074] When the gland 10, end cap 20 and the workpiece 30 to be detected are in a non-ideal installation situation (at this time, the limiting dimension B is not subjected to tolerance limitation), if the limiting dimension B is too small (i.e., Q < P - 0.03 mm), then the situations shown in Fig.13A and Fig. 13B may occur. That is, there is a large gap in the lower axial sealing contact surface D (such as the gap F shown in Fig. 13B ), resulting in insufficient compression of the O-ring rubber seal at this position (i.e., the lower axial sealing contact surface D), and thus it is impossible to achieve a high sealing effect.

[0075] In the embodiment of the present application, a sealing device is provided. For a workpiece to be detected without a sealing ring installation space in the prior art, if only a single O-ring rubber seal is used for sealing and it cannot withstand high pressure, a combination of axial sealing and radial sealing is adopted to enable the cavity 440 described herein to withstand a certain high pressure (> 10 MPa). Further, the sealing device adopts a connection method of multiple connectors 430 to clamp and seal the workpiece 30 to be detected. This method is highly operable and can be reused. Moreover, the top end of the workpiece to be detected is inserted into the groove of the gland 10 in the sealing device to control the deformation amount of the workpiece to be detected expanding under pressure during the clamping process, thereby ensuring the reliability of the seal. In addition, the main body of the gland 10 and the end cap 20 in the sealing device adopt a hollow cylindrical structure, which can not only control their own weight but also make the cavity 440 formed by the gland 10 and the workpiece to be detected a relatively small space, thereby shortening the liquid injection and pressurization time in the cavity 440.

[0076] The above has introduced the sealing device provided by the present application in detail. Specific examples are used herein to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A sealing device, characterized in that: The sealing device comprises: a gland, the gland comprising a main body portion in a hollow cylindrical shape and a flange portion; the flange portion is integrally arranged on the outer periphery of the main body portion; and An end cover, which is arranged at the bottom of the gland and connected to the gland via a plurality of connectors; Wherein, a workpiece to be detected is located between the pressure cover and the end cover; the workpiece to be detected is hollow; the workpiece to be detected includes an upper workpiece and a lower workpiece stacked up and down, and the upper workpiece and the lower workpiece are welded together; Among them, the top and the inner surface of the upper workpiece are respectively pressed and contacted with the flange part along the axial direction of the pressure cover and along the radial direction of the pressure cover through the upper seal; the top and the inner surface of the lower workpiece are respectively pressed and contacted with the main body part along the axial direction of the pressure cover and along the radial direction of the pressure cover through the lower seal.

2. The sealing device according to claim 1, characterized in that The main body portion includes a first main body portion and a second main body portion stacked up and down; the flange portion includes a first flange portion and a second flange portion stacked up and down; the flange portion is integrally arranged on the outer periphery of the first main body portion.

3. The sealing device according to claim 2, characterized in that: A groove is provided at the bottom of the first flange portion, and the top of the upper workpiece is inserted into the groove.

4. The sealing device according to claim 2, characterized in that: The upper workpieces are arranged at intervals along the outer peripheral surface of the first main body, and an arc-shaped groove is provided on the top of the lower workpiece; the inner surface of the upper workpiece, the arc-shaped groove surface of the lower workpiece and the outer peripheral surface of the first main body form a cavity, and the cavity is used to inject liquid to detect the weld area formed by welding the upper workpiece and the lower workpiece, wherein the weld area is exposed to the cavity.

5. The sealing device according to claim 4, characterized in that A liquid inlet is provided on one side of the top of the first main body, and the liquid inlet is configured to be connected to a liquid injection tube of an external liquid injection device. The liquid inlet is connected to the cavity through a pipeline provided on the first main body.

6. The sealing device according to claim 5, characterized in that: An exhaust port is also provided on one side of the top of the first main body, and the exhaust port and the liquid inlet are arranged opposite to each other along the axial direction of the pressure cover, and the exhaust port is not arranged lower than the liquid inlet in the axial direction of the pressure cover; the exhaust port is configured as an air hole plug inserted therein.

7. The sealing device according to claim 1, characterized in that: Along the axial direction of the pressure cover, there is a first distance between the bottom surface of the pressure cover and the bottom surface of the workpiece to be detected, and the first distance is 0-0.05 mm.

8. The sealing device according to claim 1, characterized in that: Along the axial direction of the gland, there is a second spacing between the bottom surface of the groove in the first flange portion of the gland and the bottom plane of the first main body portion of the gland, and there is a third spacing between the top plane of the upper workpiece and the top plane of the lower workpiece, and the relationship between the second spacing and the third spacing is: The third spacing -0.03mm<the second spacing<the third spacing+0.03mm.

9. The sealing device according to claim 1, characterized in that: The upper sealing member and the lower sealing member are annular sealing rings.

10. The sealing device according to claim 1, characterized in that The end cover is in a hollow cylindrical shape, and the multiple connecting members are evenly distributed along the circumferential direction of the end cover.

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