A self-locking lead sealing device for a pressure vessel

Abstract

To solve the technical problem that the existing sealing method of sensor leads passing through the pressure vessel is prone to sealing failure and affects the measurement results of the sensor, an embodiment of the present invention provides a self-locking pressure vessel lead sealing device, including: a lead pipe; a joint, in which there is provided: a lead interface for sealing connection with the outlet of the lead pipe; a cavity, one side of the cavity is communicated with the lead interface through a lead channel, and the cavity is used for arranging a sealing structure and a self-locking structure; a sealing structure, sealingly connected to the side of the cavity close to the lead interface; and a self-locking structure; and a gland, connected to the joint and covering the self-locking structure and the sealing structure in the cavity; one end of the lead passes through the lead interface, the lead channel, the first lead hole of the sealing structure to the second lead hole of the self-locking structure in sequence from the outlet of the lead pipe, and one end of the lead is locked in the second lead hole of the self-locking structure; the embodiment of the present invention has better sealing performance and higher reliability.

Description

Technical Field

[0001] The present invention relates to a self-locking lead sealing device for a pressure vessel. Background Art

[0002] In the in-core components of a nuclear reactor, the fluid-induced vibration test of the heat transfer tubes of a steam generator, and the hydrostatic test of a pressure vessel, a large number of test sensors are arranged inside the pressure vessel. In order to lead out the measurement wires of the sensors from the pressure vessel while sealing the pressure vessel and without damaging the signal transmission of the sensors, a lead sealing device needs to be designed.

[0003] The traditional lead sealing method for a pressure vessel mainly adopts the method of gathering the leads together and then leading them out from the reserved lead holes, and then using a fastener to squeeze the sealing surface by means of a thread for sealing. Since there are many moving devices in the reactor, during the use of the sealing device, the thread connection is likely to become loose or even fall off due to vibration, resulting in the failure of the sealing structure. Since the sealing structure cannot be inspected and adjusted in time during the operation of the reactor, it will cause inaccurate measurement results of the sensors and even lead to safety problems. If the method of pouring glue is used to seal the sensor leads, it is easy to cause sealing failure due to improper structural design or process, and it is easy to damage the leads during disassembly and assembly, affecting the signal transmission, and making the sensors unable to be reused.

[0004] The lead sealing device is required to lead out the measurement wires of the sensors from the pressure vessel while sealing the pressure vessel and without damaging the signal transmission of the sensors. In a working environment with impacts, vibrations, and variable loads, if the sealing device cannot be maintained and adjusted in time, it may cause the failure of the sealing structure, resulting in inaccurate measurement results of the sensors and even safety problems. This puts higher requirements on the reliability of the sealing structure. Summary of the Invention

[0005] To solve the technical problem that the existing sealing method for sensor leads passing through a pressure vessel is prone to sealing failure and affects the measurement results of the sensors, an embodiment of the present invention provides a self-locking lead sealing device for a pressure vessel.

[0006] The embodiment of the present invention is realized through the following technical solutions:

[0007] In a first aspect, an embodiment of the present invention provides a self-locking lead sealing device for a pressure vessel, including:

[0008] A lead tube, through which leads are used to pass.

[0009] A joint, in which there is provided:

[0010] A lead interface, which is used for sealing connection with the outlet of the lead tube.

[0011] A cavity, one side of the cavity is communicated with a lead interface through a lead channel;

[0012] A sealing structure, arranged inside the cavity, and sealingly connected to one side of the cavity close to the lead interface; and

[0013] A self-locking structure, arranged inside the cavity, one side of the self-locking structure is connected to the sealing structure; and

[0014] A gland, used for threaded connection with a joint, so that the self-locking structure and the sealing structure are covered inside the cavity by the spiral descent of the gland relative to the joint;

[0015] One end of the lead sequentially passes through the lead interface, the lead channel, the first lead hole of the sealing structure to the second lead hole of the self-locking structure from the outlet of the lead tube, and one end of the lead is locked in the second lead hole of the self-locking structure.

[0016] Further, the sealing structure includes a first sealing structure layer; the first sealing structure layer includes:

[0017] A first fixing block, the first fixing block is provided with a first lead hole a, and one side of the first fixing block is used for contacting a protrusion arranged on one side of the cavity;

[0018] A ring groove, used for being arranged on one side of the first fixing block; and

[0019] A first washer, arranged in the ring groove, and used for contacting a protrusion on one side of the cavity.

[0020] Further, the sealing structure includes a second sealing structure layer; the second sealing structure layer is arranged on the first sealing structure layer, and the second sealing structure layer includes:

[0021] A second fixing block, the second fixing block is provided with a first lead hole b, one side of the second fixing block is arranged on the other side of the first fixing block, and the other side of the second fixing block is connected to a positioning block;

[0022] A positioning block, the positioning block is provided with a first lead hole b, and is installed on the second fixing block through a positioning boss arranged on the other side of the second fixing block; and

[0023] A second washer, arranged in the first lead hole b on the positioning block, so that when the lead enters the first lead hole b, the lead is sealingly connected to the first lead hole b on the positioning block through the second washer.

[0024] Further, positioning bosses are arranged on both the upper and lower opposite sides and the left and right opposite sides of the positioning block.

[0025] Further, the sealing structure includes a third sealing structure layer; the third sealing structure layer is arranged on the second sealing structure layer, and the third sealing structure layer includes:

[0026] The third fixing block, the third fixing block is provided with a first lead hole c, and one side of the third fixing block is arranged on the positioning block;

[0027] A ring groove, concentrically arranged on the third fixing block outside the first lead hole c;

[0028] An elastic washer, arranged in the ring groove and the height of the elastic washer is lower than that of the ring groove;

[0029] A double conical washer, arranged in the first lead hole c, so that when the lead enters the first lead hole c, the lead is hermetically connected to the first lead hole c through the double conical washer; and

[0030] The fourth fixing block, the fourth fixing block is provided with a first lead hole d, and the fourth fixing block is arranged on the other side of the third fixing block;

[0031] The third fixing block is provided with a first conical groove, and the fourth fixing block is provided with a second conical groove; the first conical groove is assembled with the second conical groove through the double conical washer.

[0032] Further, the protrusion is an annular protrusion with a triangular cross-section, and the tip of the annular protrusion with a triangular cross-section contacts the washer.

[0033] Further, the self-locking structure includes:

[0034] A positioning tooth part, provided with a plurality of positioning teeth for positioning different height positions, arranged on one side of the inner cavity of the joint;

[0035] A positioning seat, provided with a second lead hole, and at least a pair of opposite sides of the positioning seat are respectively provided with guide grooves;

[0036] A plurality of sliders, each slider is slidably arranged in the guide groove, one end of each slider is used to extend out of the guide groove to adjust the radial length of the positioning seat, and the part of each slider extending out of the guide groove is used to be engaged with the positioning teeth to lock the position of the positioning seat; and

[0037] A plurality of springs, one end of each spring is connected to one end of the slider, and the other end of each spring is used to be connected to the end opposite to one end of the slider in the guide groove.

[0038] Further, the cross-section of the slider is a convex-shaped structure; the slider is slidably arranged in the guide groove, and when the slider slides out of the guide groove, the convex-shaped structure of the slider extending out of the guide groove is engaged with the positioning teeth for positioning different height positions to lock the position of the positioning seat.

[0039] Furthermore, the axes of the lead pipe, the lead interface, the lead channel, the first lead hole, and the second lead hole are on the same straight line; the first lead hole a is provided at the center of the second fixing block, the first lead hole b is provided at the center of the positioning block, the first lead hole c is provided at the center of the third fixing block, and the first lead hole d is provided at the center of the fourth fixing block.

[0040] Furthermore, a fastener is provided in the cavity of the joint; one end of the fastener is used to contact the self-locking mechanism, and the other end of the fastener is used to contact the gland; the gland is threadedly connected to the joint so that the spiral descent of the gland relative to the joint causes the fastener to press and cover the self-locking structure and the sealing structure in the cavity.

[0041] Compared with the prior art, the embodiment of the present invention has the following advantages and beneficial effects:

[0042] The self-locking pressure vessel lead sealing device of the embodiment of the present invention solves the technical problem that the existing sealing method for sensor leads passing through the pressure vessel is prone to seal failure and affects the measurement results of the sensor through the lead pipe, the lead interface, the cavity, the sealing structure, the self-locking structure, and the gland; by setting the sealing structure and adopting the self-locking structure, the embodiment of the present invention can lead the sensor lead out of the pressure vessel while sealing the pressure vessel, and does not damage the signal transmission of the sensor, having better sealing performance and higher reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0044] Figure 1 It is a schematic structural diagram of a self-locking pressure vessel lead sealing device.

[0045] Figure 2 is Figure 1 an enlarged schematic view of part A in

[0046] Figure 3 is Figure 1 an enlarged schematic view of part B in

[0047] Figure 4 is Figure 1 an enlarged schematic view of part C in

[0048] Figure 5 is Figure 1 an enlarged schematic view of part D in

[0049] Figure 6 is Figure 1 an enlarged schematic view of the E position in

[0050] Figure 7 a schematic view of the second - layer sealing structure of the present invention.

[0051] Figure 8 a schematic view of the self - locking structure assembly of the present invention.

[0052] Marks in the drawings and corresponding component names:

[0053] 1 - lead pipe, 2 - joint, 3 - first fixing block, 4 - first washer, 5 - second fixing block, 6 - positioning block, 7 - second washer, 8 - third fixing block, 9 - elastic washer, 10 - double - conical washer, 11 - fourth fixing block, 12 - self - locking structure, 13 - fastener, 14 - gland, 15 - protrusion, 16 - lead, 17 - through - hole, 18 - part of the slider extending out of the guide groove, 19 - positioning tooth, 20 - positioning boss, 121 - positioning seat, 122 - spring, 123 - slider. Specific embodiments

[0054] To make the objectives, technical solutions and advantages of the present invention more clear and understandable, the present invention will be further described in detail below with reference to the embodiments and the drawings. The illustrative embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0055] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present invention. However, it is obvious to those of ordinary skill in the art that the present invention does not have to employ these specific details. In other embodiments, well - known structures, circuits, materials or methods are not specifically described to avoid obscuring the present invention.

[0056] Throughout the specification, the reference to "an embodiment", "embodiment", "an example" or "example" means that a particular feature, structure or characteristic described in connection with the embodiment or example is included in at least one embodiment of the present invention. Thus, the phrases "an embodiment", "embodiment", "an example" or "example" appearing throughout the specification do not necessarily all refer to the same embodiment or example. In addition, the specific features, structures or characteristics may be combined in any suitable combination and / or sub - combination in one or more embodiments or examples. Moreover, those of ordinary skill in the art should understand that the drawings provided herein are for illustrative purposes only and are not necessarily drawn to scale. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0057] In the description of the present invention, the orientation or positional relationship indicated by terms such as "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the protection scope of the present invention.

[0058] Embodiment

[0059] To solve the technical problem that the existing sealing method of the sensor lead passing through the pressure vessel is prone to seal failure and affect the measurement result of the sensor. In a first aspect, an embodiment of the present invention provides a self-locking pressure vessel lead sealing device. Refer to Figure 1-8 As shown, it includes: a lead tube 1 for the lead 16 to pass through inside; a joint 2 with a lead interface inside for sealing connection with the outlet of the lead tube; a cavity, one side of the cavity is connected to the lead interface through a lead channel; a sealing structure provided inside the cavity and sealingly connected to the side of the cavity close to the lead interface; and a self-locking structure 12 provided inside the cavity, one side of the self-locking structure is connected to the sealing structure; and a gland for threadedly connecting with the joint to cover the self-locking structure and the sealing structure inside the cavity by the spiral descent of the gland relative to the joint; one end of the lead passes through the outlet of the lead tube, through the lead interface, the lead channel, the first lead hole of the sealing structure to the second lead hole of the self-locking structure in sequence, and one end of the lead is locked in the second lead hole of the self-locking structure.

[0060] Thus, the embodiment of the present invention solves the technical problem that the existing sealing method of the sensor lead passing through the pressure vessel is prone to seal failure and affect the measurement result of the sensor through the lead tube, the lead interface, the cavity, the sealing structure, the self-locking structure and the gland; by setting the sealing structure and adopting the self-locking structure, the embodiment of the present invention can seal the pressure vessel while leading out the sensor lead, and does not damage the signal transmission of the sensor, and has better sealing performance and higher reliability.

[0061] Optionally, the fastener is a nut.

[0062] Further, the sealing structure includes a first sealing structure layer; the first sealing structure layer includes:

[0063] A first fixing block, the first fixing block 3 is provided with a first lead hole a, and one side of the first fixing block is used to contact the protrusion 15 provided on one side of the cavity;

[0064] A ring groove for being provided on one side of the first fixing block; and

[0065] The first washer 4 is disposed in the annular groove and is used to contact the protrusion on one side of the cavity.

[0066] Furthermore, the sealing structure includes a second sealing structure layer; the second sealing structure layer is disposed on the first sealing structure layer, and the second sealing structure layer includes:

[0067] A second fixing block 5, the second fixing block is provided with a first lead hole b, one side of the second fixing block is disposed on the other side of the first fixing block, and the other side of the second fixing block is connected to the positioning block;

[0068] A positioning block 6, the positioning block is provided with a first lead hole b and is mounted on the second fixing block through a positioning boss disposed on the other side of the second fixing block; and

[0069] A second washer 7 is disposed in the first lead hole b on the positioning block, so that when the lead enters the first lead hole b, the lead is hermetically connected to the first lead hole b on the positioning block through the second washer.

[0070] Furthermore, positioning bosses 20 are provided on the upper and lower opposite sides and the left and right opposite sides of the positioning block.

[0071] Furthermore, the sealing structure includes a third sealing structure layer; the third sealing structure layer is disposed on the second sealing structure layer, and the third sealing structure layer includes:

[0072] A third fixing block 8, the third fixing block is provided with a first lead hole c, and one side of the third fixing block is disposed on the positioning block;

[0073] An annular groove is concentrically disposed on the third fixing block outside the first lead hole c;

[0074] An elastic washer 9 is disposed in the annular groove and the height of the elastic washer is lower than that of the annular groove;

[0075] A double conical washer 10 is disposed in the first lead hole c, so that when the lead enters the first lead hole c, the lead is hermetically connected to the first lead hole c through the double conical washer; and

[0076] A fourth fixing block 11, the fourth fixing block is provided with a first lead hole d, and the fourth fixing block is disposed on the other side of the third fixing block;

[0077] The third fixing block is provided with a first conical groove, and the fourth fixing block is provided with a second conical groove; the first conical groove is assembled with the second conical groove through the double conical washer.

[0078] Furthermore, the protrusion is an annular protrusion with a triangular cross-section, and the tip of the annular protrusion with a triangular cross-section contacts the washer.

[0079] Furthermore, the self-locking structure includes:

[0080] The positioning tooth part is provided with a plurality of positioning teeth 19 for positioning different height positions, and is arranged on one side of the inner cavity of the joint.

[0081] The positioning seat 121 is provided with a second lead hole, and at least a pair of opposite sides of the positioning seat are respectively provided with guide grooves.

[0082] A plurality of sliders, each slider is slidably arranged in the guide groove, one end of each slider is used to extend out of the guide groove to adjust the radial length of the positioning seat, and the part 18 of each slider extending out of the guide groove is used to be clamped with the positioning teeth to realize the locking of the position of the positioning seat; and

[0083] A plurality of springs 122, one end of each spring is connected to one end of the slider, and the other end of each spring is used to be connected to the end opposite to one end of the slider in the guide groove.

[0084] Further, the cross-section of the slider is a convex-shaped structure; the slider is slidably arranged in the guide groove, and when the slider slides out of the guide groove, the convex-shaped structure of the slider extending out of the guide groove is clamped with the positioning teeth for positioning different height positions to realize the locking of the position of the positioning seat.

[0085] Optionally, the slider is provided with a through hole 17 for facilitating the sliding and removal of the slider.

[0086] Further, the axes of the lead pipe, the lead interface, the lead channel, the first lead hole and the second lead hole are on the same straight line; the first lead hole a is arranged at the center of the second fixing block, the first lead hole b is arranged at the center of the positioning block, the first lead hole c is arranged at the center of the third fixing block, and the first lead hole d is arranged at the center of the fourth fixing block.

[0087] Further, a fastener is arranged in the cavity of the joint; one end of the fastener is used to contact the self-locking mechanism, and the other end of the fastener is used to contact the gland; the gland is threadedly connected to the joint so that the fastener presses and covers the self-locking structure and the sealing structure in the cavity by the spiral descent of the gland relative to the joint.

[0088] Specifically, the self-locking pressure vessel lead sealing device includes: a lead pipe 1, a joint 2, a first sealing structure layer (including a first fixing block 3 and a first gasket 4), a second sealing structure layer (a second fixing block 5, a positioning block 6 and a second gasket 7), a third sealing structure layer (a third fixing block 8, an elastic gasket 9, a double-cone gasket 10 and a fourth fixing block 11), a self-locking structure 12, a fastener 13 and a gland 14.

[0089] The first sealing structure layer includes a first fixed block and a first gasket. A hole is opened at the center of the first fixed block, and the sensor lead passes through the hole. The position where the first fixed block contacts the connector 2 is conical (protrusion 15), which has higher assembly reliability. The first gasket 4 is assembled in the annular groove on the first fixed block and contacts the annular protrusion with a triangular cross section on the inner side of the connector. When an axial force is applied to the first fixed block (3), the annular protrusion with a triangular cross section is pressed against the first gasket (4), thereby forming a line seal with better sealing performance.

[0090] The second sealing structure layer includes a second fixed block 5, a positioning block 6 and a second gasket 7. The second gasket 7 is an O-type gasket. Four positioning bosses 20 are provided on the second fixed block for installing the positioning block 6. A hole is opened on the second fixed block for the lead to pass through, and an O-type gasket is placed between the lead hole and the positioning block. The position where the second sealing structure layer is assembled with the joint is conical, and the assembly reliability is higher. When an axial force is applied to the second sealing structure layer, the positioning block is pressed against the O-type gasket by the reaction force of the joint, thereby sealing the lead.

[0091] The third sealing structure layer includes a third fixed block 8, an elastic gasket 9, a double-conical gasket 10 and a fourth fixed block 11. The elastic gasket is assembled in the annular groove on the third fixed block, and the height of the elastic gasket is lower than the height of the annular groove. The fourth layer of fixed blocks is assembled with the third fixed block ( through the annular groove. The center positions of the third fixed block and the fourth fixed block are both conical, so as to be assembled with the double-conical gasket. When an axial force is applied to the third sealing structure layer, the elastic gasket is compressed, and the double-conical gasket between the third fixed block and the fourth fixed block is pressed. Due to the structure of the conical surface, the double-conical gasket will be subjected to the radial reaction force provided by the fixed block, thereby pressing the sensor lead to form a sealing structure.

[0092] The self-locking structure includes a positioning seat 121, a spring 122 and a slider 123. A hole is opened at the center of the positioning seat for the sensor lead to pass through. A guide groove is opened on the positioning seat for positioning and guiding the slider, and can also prevent the slider from overturning when subjected to force. One end of the spring 122 is fixed on the positioning seat 121 by welding, and the other end is connected to the slider 123. The slider 123 is a conical surface in the circumference, and the angle of the conical surface is consistent with the assembly position in the joint to ensure the reliability of the connection. Through the above structure, the self-locking structure can realize the function of variable diameter. When subjected to axial force, it can be assembled with the serrated stepped structure on the joint 2, namely the positioning tooth 19, to form "self-locking". At the same time, the axial position of the self-locking structure 12 is adjustable, which provides space for the change of the sealing structure in the joint 2. The slider 123 has a through hole in the axial direction, and the self-locking structure 12 can be taken out by reducing the diameter, which is convenient for the disassembly of the sealing device.

[0093] Install a gland on the three-layer sealing structure and the self-locking structure. The fastener and the joint are connected by a threaded connection. By rotating the fastener, an axial force is applied to the gland, thereby transmitting the axial force to the self-locking structure to complete the installation of the lead sealing device.

[0094] Thus, the embodiment of the present invention solves the sealing problem when the sensor lead penetrates the pressure vessel. In a working environment with impacts, vibrations, and variable loads, if the sealing device cannot be maintained and adjusted in time, it may cause the failure of the sealing structure, resulting in inaccurate sensor measurement results or even safety problems. By setting a three-layer sealing structure and adopting a self-locking structure, the present invention can lead the sensor lead out of the pressure vessel while sealing the pressure vessel without damaging the signal transmission of the sensor, having better sealing performance and higher reliability, and ensuring the smooth progress of the test research and the accuracy of data measurement.

[0095] Furthermore, the embodiment of the present invention also has the following beneficial effects: 1) A self-locking structure is provided in the sealing device of the embodiment of the present invention, which can ensure the safety and reliability of the sealing structure. 2) When the sensor lead is led out of the pressure vessel in the embodiment of the present invention, the lead can be not damaged, ensuring the multiple use of the sensor. 3) The sealing device of the embodiment of the present invention has a multi-layer structure, which can ensure the reliability of the sealing performance. 4) The sealing device of the embodiment of the present invention is easy to disassemble, which can reduce the damage to the lead caused by disassembly.

[0096] The above specific embodiments further elaborate on the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above is only the specific embodiment of the present invention and is not used to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A self-locking lead sealing device for a pressure vessel, characterized in that, Comprising: A lead pipe through which a lead is to pass inside; A connector, inside which are provided: A lead interface for sealing connection with the outlet of the lead pipe; A cavity, one side of which is communicated with the lead interface through a lead channel; A sealing structure provided inside the cavity and sealingly connected with the side of the cavity close to the lead interface; And A self-locking structure provided inside the cavity, one side of the self-locking structure being connected with the sealing structure; And A gland for threaded connection with the connector to cover the self-locking structure and the sealing structure inside the cavity by the spiral descent of the gland relative to the connector; One end of the said lead passes through the lead interface, the lead channel, the first lead hole of the sealing structure to the second lead hole of the self-locking structure in sequence from the outlet of the lead pipe, and one end of the said lead is locked inside the second lead hole of the self-locking structure; Wherein, the said sealing structure comprises a first sealing structure layer; The first sealing structure layer comprises: A first fixing block provided with a first lead hole a, one side of the first fixing block being for contact with a projection provided on one side of the cavity; A ring groove for being provided on one side of the first fixing block; And A first washer provided inside the ring groove for contact with the projection on one side of the cavity; Wherein, the said self-locking structure comprises: A positioning tooth part provided with a plurality of positioning teeth for positioning different height positions, provided on one side of the cavity inside the connector; A positioning seat provided with a second lead hole, at least a pair of opposite sides of the positioning seat being respectively provided with guiding grooves; A plurality of sliders, each slider being slidably provided inside the guiding groove, one end of each slider being for protruding outside the guiding groove to adjust the radial length of the positioning seat, and the part of each slider protruding outside the guiding groove being for engaging with the positioning teeth to realize the locking of the position of the positioning seat; And A plurality of springs, one end of each spring being connected with one end of the slider, and the other end of each spring being for connection with the end opposite to one end of the slider inside the guiding groove.

2. The self-locking pressure vessel lead wire sealing device according to claim 1, wherein, The said sealing structure comprises a second sealing structure layer; The second sealing structure layer is provided on the first sealing structure layer, and the second sealing structure layer comprises: A second fixing block provided with a first lead hole b, one side of the second fixing block being provided on the other side of the first fixing block, and the other side of the second fixing block being connected with a positioning block; A positioning block provided with a first lead hole b and installed on the second fixing block through a positioning boss provided on the other side of the second fixing block; And A second washer provided inside the first lead hole b on the positioning block, so that when the lead enters the first lead hole b, the lead is sealingly connected with the first lead hole b on the positioning block through the second washer.

3. The self-locking pressure vessel lead wire sealing device according to claim 2, characterized in that, The upper and lower opposite sides and the left and right opposite sides of the said positioning block are all provided with positioning bosses.

4. The self-locking pressure vessel lead wire sealing device according to claim 2, wherein The said sealing structure comprises a third sealing structure layer; The third sealing structure layer is provided on the second sealing structure layer, and the third sealing structure layer comprises: A third fixing block provided with a first lead hole c, one side of the third fixing block being provided on the positioning block; A ring groove concentrically provided on the third fixing block outside the first lead hole c; An elastic washer provided inside the ring groove and the height of the elastic washer being lower than that of the ring groove; A double conical surface washer provided inside the first lead hole c, so that when the lead enters the first lead hole c, the lead is sealingly connected with the first lead hole c through the double conical surface washer; And The fourth fixing block is provided with a first lead hole d, and the fourth fixing block is arranged on the other side of the third fixing block; The third fixing block is provided with a first tapered groove, and the fourth fixing block is provided with a second tapered groove; the first tapered groove is assembled with the second tapered groove through a double conical washer.

5. The self-locking pressure vessel lead wire sealing device according to claim 4, characterized in that, The axes of the lead pipe, the lead interface, the lead channel, the first lead hole, and the second lead hole are on the same straight line; the first lead hole a is arranged at the center of the second fixing block, the first lead hole b is arranged at the center of the positioning block, the first lead hole c is arranged at the center of the third fixing block, and the first lead hole d is arranged at the center of the fourth fixing block.

6. The self-locking pressure vessel lead wire sealing device according to claim 4, wherein The protrusion is an annular protrusion with a triangular cross-section, and the tip of the annular protrusion with a triangular cross-section contacts the washer.

7. The self-locking pressure vessel lead sealing device according to claim 1, characterized in that The cross-section of the slider is a convex-shaped structure; the slider is slidably arranged in the guide groove. When the slider slides out of the guide groove, the convex-shaped structure of the slider extending out of the guide groove is engaged with the positioning teeth at different height positions to lock the position of the positioning seat.

8. The self-locking pressure vessel lead sealing device according to claim 1, wherein A fastener is arranged in the cavity of the joint; one end of the fastener is used to contact the self-locking mechanism, and the other end of the fastener is used to contact the gland; the gland is threadedly connected to the joint, and the spiral descent of the gland relative to the joint causes the fastener to press and cover the self-locking structure and the sealing structure in the cavity.

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