Special-shaped vacuum opening structure and vacuum opening method

Abstract

The structure comprises a suction opening base, a suction opening plug and a sealing ring, the suction opening base is connected with a suction opening valve and a target container, the suction opening plug is located in the suction opening base and connected with a connecting rod, the connecting rod penetrates out of one end of the suction opening valve, and the sealing ring is located between the suction opening plug and the suction opening base. A special-shaped protrusion is arranged on the edge of the upper surface of the drawing opening plug, and the special-shaped protrusion is an asymmetric protrusion with one side being a fold line and the other side being a smooth arc line. A limiting piece is arranged in the drawing opening base and matched with the special-shaped protrusion of the drawing opening plug. The number of the special-shaped protrusions is one or more, and the number of the limiting pieces is consistent with the number of the special-shaped protrusions. Compared with the prior art, the structure is simple, the reliability is high, operation is easy and convenient, the problem that the connecting rod and the extraction opening plug cannot be effectively installed or separated during vacuum treatment can be effectively solved, and therefore the risk of vacuum leakage caused by the fact that the connecting rod is left after vacuum treatment is completed is avoided.

Description

Technical Field

[0001] The invention relates to the field of vacuum technology for superconducting power equipment, and in particular to a special-shaped vacuum extraction port structure and a vacuum extraction port method. Background Art

[0002] In the field of vacuum science, vacuum means a gas state with a pressure lower than one atmosphere in a given space. People usually call this rarefied gas state a vacuum state. Compared with the atmospheric state on which humans depend for survival, this specific vacuum state has the following main characteristics:

[0003] (1) The gas pressure in a vacuum state is less than one atmosphere. Therefore, various vacuum containers on the surface of the earth will be affected by atmospheric pressure, and the size of the pressure difference is determined by the pressure difference between the inside and outside of the container. Since one atmosphere of pressure acting on the surface of the earth is 101325N / ㎡, when the pressure inside the container is very small, the atmospheric pressure that the container bears can reach one atmosphere.

[0004] (2) In a vacuum state, due to the rarefaction of the gas, the number of gas molecules per unit volume, i.e., the molecular density of the gas, is less than the molecular density of the gas at atmospheric pressure. Therefore, the number of collisions between molecules, between molecules and other particles (such as electrons, ions, etc.), and between molecules and various surfaces (such as the wall) is relatively reduced, which increases the molecular free path of the gas.

[0005] (3) Under vacuum conditions, due to the decrease in molecular density, the content of gases such as oxygen and hydrogen (including water content) that make up the atmosphere also decreases relatively.

[0006] Therefore, when some materials or products need to have less impurities or need to remove the influence of moisture, the production container or manufacturing container will be vacuum treated. In addition, vacuum is also applied in some occasions where heat preservation is required, and a certain degree of heat preservation is achieved by using the lack of heat conduction and heat convection in vacuum. Different applications usually require different vacuum states.

[0007] Vacuum degree at 10 3 Pa-10 5 The range of Pa is called rough vacuum. At this time, compared with normal pressure, the gas state has only a change in the number of molecules from large to small, but no change in the characteristics of gas molecules, and the molecules collide with each other frequently. Generally, rough vacuum is required in vacuum attraction, transportation of solids, liquids, colloids and particles, vacuum forming, vacuum filtration, vacuum impregnation and other occasions.

[0008] Vacuum degree at 10 -1 Pa-10 3The range of Pa is called low vacuum, at which the collisions between gas molecules and between molecules and the wall are comparable, and the density of gas molecules is relatively small. Under this vacuum degree, the reduction of gas molecule density can not only achieve non-oxidative heating, but also the gradual disappearance of gas heat conduction and heat convection when the gas pressure decreases to achieve vacuum insulation and insulation. At the same time, the principle of lowering the boiling point of liquid when the pressure decreases can also be used to achieve vacuum freezing and vacuum drying. Low vacuum is generally required in vacuum melting, heat treatment, vacuum insulation, vacuum insulation, vacuum freezing, vacuum hot rolling and other occasions of ferrous metals.

[0009] Vacuum degree at 10 -3 Pa-10 -1 Pa range is called high vacuum, at this time, there are very few collisions between molecules, there are very few collisions between molecules and the wall, and the density of gas molecules is small. In this case, the characteristics of low gas molecule density and weak chemical reaction between any substance and residual gas molecules can be used to carry out vacuum metallurgy, vacuum coating, etc. High vacuum is generally required in vacuum melting and refining of rare metals, ultra-pure metals and alloys, semiconductor materials, vacuum coating, ion implantation, etc.

[0010] Vacuum degree at 10 -6 Pa-10 -3 The Pa range is called ultra-high vacuum. At this time, the density of gas molecules is extremely low, and the number of collisions with the wall is extremely small, which increases the time it takes to form a single molecular layer on the surface. There are only atoms of the solid itself in the gaseous space, and almost no other atoms or molecules. Therefore, the study of surface physics and surface chemistry can be achieved by utilizing the principle that the density of gas molecules is extremely low, the collisions with the surface are extremely rare, and the time it takes to form a single molecular layer on the surface is very long. This vacuum condition is generally used in controlled thermonuclear fusion, research on surface physics and surface chemistry, simulation of the space environment, and operation of large synchrotron proton accelerators.

[0011] In the application of superconducting technology, it generally requires the use of low-temperature cooling media such as liquid helium and liquid nitrogen. The temperature of the low-temperature cooling medium is at least 200K different from the normal temperature. Therefore, for such a large temperature difference, the thermal insulation container needs to have very good insulation performance, that is, to minimize the heat leakage from the outside to the low-temperature medium. There are three main ways of heat transfer: heat conduction, heat convection and heat radiation. In general thermal insulation containers, a multi-layer insulation layer composed of multiple layers of aluminum-coated film and non-woven fabrics staggered and stacked, and a vacuum are usually used to form a vacuum multi-layer composite insulation structure. The aluminum-coated film is used to block thermal radiation, the non-woven fabric is used to block heat conduction, and the vacuum is used to block thermal convection. As mentioned earlier, in situations where vacuum insulation is required, the vacuum degree needs to reach a low vacuum, that is, the vacuum degree is between 10 -1 Pa-10 3Pa range. However, in the application of superconducting technology, the temperature difference between the refrigerant and the room temperature is too large. Therefore, there is a higher requirement for the vacuum degree, and the vacuum state needs to reach a high vacuum, that is, 10 -3 Pa-10 -1 Pa range, even the vacuum degree needs to be less than 10 -3 Pa.

[0012] In order to make the target container reach the required vacuum degree, the target container needs to be evacuated. At this time, a vacuum processing system is usually required. The simplest vacuum processing system includes the container to be evacuated (i.e. the target container), a vacuum gauge, connecting pipes, vacuum valves, and vacuum pumps. Since the target container needs to be disconnected from the connecting pipes, vacuum valves, and vacuum pumps after reaching the target vacuum degree and completing the vacuum processing. Therefore, a vacuum extraction port is usually used in the target container to achieve this function.

[0013] Generally speaking, the structure of vacuum pumping includes a pumping base, a pumping plug and two sealing rings, while the pumping base includes a sealing flange and a base pipe. Generally speaking, the vacuum pumping port needs to be used with a pumping port valve. As shown, the pumping port valve consists of a tee, a connecting rod, and a sealing flange. The sealing flange and the flange structure on the tee are both KF flange structures, and there is a sealing O-ring between the sealing flange and the tee, and the three are assembled together through a clamp. Two sealing rings and a connecting rod are used to form a column seal in the straight pipe of the sealing flange. The column seal is a dynamic seal structure mainly used for seals that need to move. There is a round handle on one end of the outer side of the connecting rod for controlling the connecting rod, and a thread matching the threaded hole of the pumping port plug on the other end. In normal use, the connecting rod and the pumping port plug are combined together through threads. Since the flange of the pumping port base and the pumping port valve are also KF flange structures, the two are also combined together through a clamp and an O-ring. When pumping, the pumping port valve is first assembled with the vacuum pumping port, and then the connecting pipe and the pumping port valve are assembled together through a clamp and an O-ring. After the pumping port valve is connected to the connecting pipe and the vacuum pumping port, align the thread on the connecting rod with the threaded hole on the pumping port plug, and then assemble the two together. After the connecting rod and the pumping port plug are assembled, when the target container is vacuumed, first turn on the vacuum pump, and then pull out the pumping port plug placed in the pumping port through the connecting rod. In this way, the target container and the vacuum pump form an evacuation passage through the connecting pipe, and the target container is evacuated by the vacuum pump. After the target container reaches the target vacuum degree, push the connecting rod so that the pumping port plug is inserted into the pumping port base, and then rotate the connecting rod to withdraw it to separate it from the pumping port plug. Then stop the vacuum pump, stop evacuation, and remove the pipeline.

[0014] It can be seen from the above usage that whether the connecting rod is installed or removed, the connecting rod and the draw-out plug need to be assembled and fixed by threads. However, since the draw-out port and the draw-out port are both cylindrical or cylindrical trapezoidal. Therefore, in the process of installing or separating the connecting rod and the draw-out plug, the installation or separation of the connecting rod and the draw-out plug can only be achieved with the help of the friction between the plug and the draw-out base. When the connecting rod and the draw-out plug fit very tightly, the two cannot be separated by relying solely on the friction between the draw-out port and the plug, which will cause the connecting rod to remain on the draw-out plug, greatly increasing the risk of vacuum leakage. Summary of the invention

[0015] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide a special-shaped vacuum extraction port structure and a vacuum extraction port method with tight installation and smooth separation.

[0016] The purpose of the present invention can be achieved by the following technical solutions:

[0017] According to one aspect of the present invention, a special-shaped vacuum outlet structure is provided, comprising an outlet base, an outlet plug, and a sealing ring, wherein the outlet base is connected to an outlet valve and a target container, the outlet plug is located in the outlet base and connected to a connecting rod, the connecting rod passes through one end of the outlet valve, the sealing ring is located between the outlet plug and the outlet base, and a special-shaped protrusion is provided at the edge of the upper surface of the outlet plug, wherein the special-shaped protrusion is an asymmetric protrusion with a fold line on one side and a smooth arc on the other side;

[0018] A limiting piece is arranged in the draw-out base, and the limiting piece matches with the special-shaped protrusion of the draw-out plug; the number of the special-shaped protrusion is one or more, and the number of the limiting piece is consistent with the number of the special-shaped protrusion.

[0019] Furthermore, the special-shaped protrusion is typhoon-shaped, including a connecting portion, a smooth portion and a tip. The connecting portion, the tip and the smooth portion are connected in sequence at the edge of the upper surface of the drawer plug. The connecting portion and the tip are connected by a broken line, and the outer diameter of the edge where the smooth portion is located is larger than the outer diameter of the edge where the connecting portion is located.

[0020] Furthermore, the drawout base has a stepped hole that penetrates from top to bottom, the minimum diameter of the stepped hole is larger than the minimum outer diameter of the drawout plug, and the maximum outer diameter of the drawout plug is larger than the minimum diameter of the stepped hole.

[0021] Furthermore, the length of the limiting plate is smaller than the radius difference between the inner diameter of the drawer base and the outer diameter of the drawer plug, the height of the limiting plate is smaller than the depth of the maximum hole of the inner diameter of the stepped hole of the drawer base, and the height of the limiting plate is greater than the thickness of the special-shaped protrusion on the drawer plug.

[0022] Furthermore, a chamfer is provided at the upper edge of the limiting piece, and a step surface of the step hole is connected to the lower edge of the limiting piece.

[0023] Furthermore, a threaded hole is provided at the center of the upper surface of the draw-out plug, and the connecting rod is connected to the draw-out plug through the threaded hole.

[0024] Furthermore, the lower surface of the special-shaped protrusion is an inclined surface, and the thickness of the inclined surface on the fold line side of the special-shaped protrusion is less than the thickness on the smooth arc line side.

[0025] Furthermore, a plurality of sealing ring grooves are provided on the outer surface of the draw-out plug, and the sealing rings are located in the sealing ring grooves.

[0026] Furthermore, the withdrawal base is connected to the target container by welding, and the withdrawal base is connected to the withdrawal valve by a flange.

[0027] According to another aspect of the present invention, there is provided a vacuum extraction method, comprising the following steps:

[0028] Install the sealing ring on the outer surface of the draw-out plug, and place the draw-out plug into the draw-out base;

[0029] Connect the vacuum pump and the evacuation valve through the vacuum valve and the connecting pipe, connect the extraction valve to the extraction base, limit the rotation and movement of the extraction plug in the extraction base through the limit plate, and pass the connecting rod through the extraction valve and connect it to the extraction base;

[0030] Pull the connecting rod upwards, and the draw-out plug is driven by the connecting rod to move upwards and separate from the draw-out base;

[0031] Start the vacuum pump to perform vacuum treatment on the target container;

[0032] The drawer plug is pushed toward the drawer base through the connecting rod until the drawer plug enters the drawer base. When the drawer plug is fully inserted into the drawer base, the rotation and movement of the drawer plug in the drawer base are limited by the limit plate, and the connecting rod is rotated to release the connection between the connecting rod and the drawer base.

[0033] Release the connection between the pump-out valve and the pump-out base, and strengthen the connection between the pump-out base and the target container.

[0034] Compared with the prior art, the present invention has the following advantages:

[0035] 1. An asymmetric special-shaped protrusion with a broken line on one side and a smooth arc on the other side is provided at the edge of the upper surface of the drawer plug of the present invention, and a limiting plate is provided in the drawer base, and the limiting plate cooperates with the special-shaped protrusion; when the drawer plug is tightened by the connecting rod, the special-shaped protrusion interferes with the limiting plate, so that the rotation of the drawer plug is subject to a certain restriction, and there is a deviation in the rotational movement speed or displacement between the connecting rod and the drawer plug, thereby realizing the reliable installation of the connecting rod and the drawer plug; when the connecting pipe is removed, the connecting rod is rotated, and when it reaches a certain position, the special-shaped protrusion on the drawer plug will be blocked by the limiting plate on the drawer base, and the rotation of the drawer plug is restricted and cannot rotate with the connecting rod, so that the connecting rod can be easily separated from the drawer plug.

[0036] 2. A slope is provided at the lower part of the special-shaped protrusion of the present invention. When the drawer plug is inserted into the drawer base, if the special-shaped protrusion happens to fall on the limiting piece of the drawer base, the drawer plug will rotate and continue to move toward the drawer base due to the existence of the slope, thereby achieving complete installation of the drawer plug and the drawer base and avoiding the situation where the drawer plug stops on the limiting piece of the drawer base and is not completely installed.

[0037] 3. The vacuum extraction method of the present invention adjusts the relative positions of the extraction plug and the extraction base when the connecting rod and the extraction plug are connected and disconnected, and uses the extraction base to constrain the movement of the extraction plug to avoid the displacement of the extraction plug during connection and contact connection. The operation is simple and can effectively solve the problem that the connecting rod and the extraction plug cannot be effectively installed or separated during vacuum processing, thereby avoiding the risk of vacuum leakage caused by the remaining connecting rod after the vacuum processing is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic diagram of the cooperation between the drawer base and the drawer plug;

[0039] Figure 2 It is a cross-sectional schematic diagram of the present invention;

[0040] Figure 3 It is a schematic diagram of the structure of the drawer base;

[0041] Figure 4 It is a schematic diagram of the pumping plug structure;

[0042] Figure 5 Schematic diagram of the drawer plug structure Figure 2 ;

[0043] Figure 6 This is a front view of the draw-out plug;

[0044] Figure 7 Illustration of the matching between the drawer base and the drawer plug Figure 2 ;

[0045] Figure 8 The cross-section diagram of the present invention is shown in FIG. Figure 2 ;

[0046] Fig. 9 It is a schematic diagram of the structure of the present invention;

[0047] Fig.10 It is a schematic diagram of the application of the present invention;

[0048] Fig.11 The present invention is applied to illustrate Figure 2 ;

[0049] Fig.12 The present invention is applied to illustrate Figure 3 ;

[0050] Fig.13 The structure of the present invention is shown in FIG. Figure 2 ;

[0051] Fig.14 It is a schematic diagram of the connection application of the present invention;

[0052] In the figure, 1. draw-out base, 11. limit plate, 2. draw-out plug, 21. special-shaped protrusion, 211. connecting part, 212. smooth part, 213. tip, 3. sealing ring, 4. connecting rod, 5. vacuum gauge, 6. connecting pipe, 7. vacuum valve, 8. vacuum pump, 9. draw-out valve, 10. target container. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0054] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0055] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0056] Example 1

[0057] The present invention provides a special-shaped vacuum outlet structure, comprising an outlet base 1, an outlet plug 2, and a sealing ring 3, such as Figure 1 and Figure 2 As shown. The draw-out base 1 serves as an assembly base for the draw-out plug 2, which is welded to the target container 10 that needs to be vacuum treated. Figure 3As shown, there are two symmetrically positioned limit plates 11 on the draw-out base 1, and the width and height of the limit plates 11 can be designed according to specific needs. The flange of the draw-out base 1 and the draw-out valve 9 are both KF flange structures, and the length of the limit plate 11 is less than the radius difference between the draw-out port and the inner diameter of the external KF flange to ensure that the limit plate 11 will not interfere with the insertion or removal of the draw-out plug 2. The height of the limit plate 11 should be less than the height difference between the draw-out port and the external KF flange, and higher than the thickness of the special-shaped protrusion 21 on the draw-out plug 2 to ensure that when the connecting rod 4 is screwed in or out, the limit plate 11 can be mentioned to limit the rotation of the draw-out plug 2. In order to avoid the edge of the limit plate 11 from scratching the sealing ring 3, causing the sealing ring 3 to be damaged, affecting the effect of the columnar seal, the edge of the limit plate 11 should be chamfered. In addition, the number of limit plates 11 on the draw-out base 1 can be changed, and there can be multiple limit plates 11, and at least one is required. When designing multiple limiting pieces 11 , they need to be determined according to the design of the special-shaped protrusion 21 of the withdrawal plug 2 to avoid the withdrawal plug 2 being unable to be fully inserted due to interference between the limiting pieces 11 and the special-shaped protrusion 21 .

[0058] The structural schematic diagram of the extraction plug 2 is as follows Figure 4 As shown. There is a group of symmetrical special-shaped protrusions 21 on the upper part of the draw-out plug 2. The special-shaped protrusions 21 are similar to the shape of a "typhoon", with a broken line on one side and a smooth arc on the other side. The maximum length of the special-shaped protrusions 21 of the draw-out plug 2 is smaller than the inner diameter of the external KF flange, and larger than the inner diameter of the upper limit plate 11 of the draw-out base 1, so as to ensure that when the draw-out plug 2 is in a fully inserted state, the special-shaped protrusions 21 can interfere with the limit plate 11 on the draw-out base 1, as shown in FIG. Figure 5 and Figure 6 As shown. In addition, there is a slope at the bottom of the special-shaped protrusion 21. The function of the slope is that when the drawer plug 2 is inserted into the drawer base 1, if the special-shaped protrusion 21 just falls on the stopper 11 of the drawer base 1, the drawer plug 2 will rotate and continue to move toward the drawer base 1 due to the existence of the slope. In this way, the drawer plug 2 and the drawer base 1 are completely installed, avoiding the situation where the drawer plug 2 stops on the stopper 11 of the drawer base 1 and is not completely installed.

[0059] As a preferred embodiment, the special-shaped protrusion 21 includes a connecting portion 211, a smooth portion 212 and a tip 213, and the connecting portion 211, the tip 213 and the smooth portion 212 are connected in sequence at the edge of the upper surface of the drawer plug, and the connecting portion 211 and the tip 213 are connected by a broken line, and the outer diameter of the edge where the smooth portion 212 is located is larger than the outer diameter of the edge where the connecting portion 211 is located.

[0060] The lower part of the drawer plug 2 has two grooves for installing the sealing ring 3. The lower part of the drawer plug 2 is a normal axisymmetric cylindrical structure, so that when the drawer plug 2 is fully installed, the sealing ring 3 can be evenly squeezed. The selection of the sealing ring 3 is based on the actual use requirements, and the sealing ring 3 with suitable wire diameter and outer diameter is selected and installed on the drawer plug 2. The sealing ring 3 can be made of different materials according to the actual use situation, such as silicone, nitrile or fluororubber. Place the drawer plug 2 with the sealing ring 3 installed in the drawer base 1. At this time, the drawer plug 2 is used to realize the separation of the vacuum environment inside the container and the external environment, and the sealing ring 3 is squeezed evenly through the internal and external pressure difference of the drawer plug 2 to achieve reliable columnar vacuum sealing.

[0061] When the target cavity needs to be vacuumed during normal use, the suction valve 9 is first installed on the flange on the suction base 1 of the present invention. Subsequently, the thread of the connecting rod 4 on the suction valve 9 is tightened into the threaded hole on the suction plug 2 to realize the threaded assembly connection between the connecting rod 4 and the suction plug 2. When the connecting rod 4 tightens the suction plug 2, the special-shaped protrusion 21 of the suction plug 2 interferes with the limit plate 11 on the suction base 1. When the connecting rod 4 tightens the suction plug 2, the rotation of the suction plug 2 is subject to certain restrictions, so that there is a deviation in the rotational movement speed or displacement between the connecting rod 4 and the suction plug 2, thereby realizing the reliable installation of the connecting rod 4 and the suction plug 2. After the connecting rod 4 and the suction plug 2 are assembled, the suction plug 2 can be separated from the suction base 1 by pulling the connecting rod 4 upward, and the target container 10 is vacuumized by using the vacuum pump 8. Two sealing rings 3 are installed on the suction plug 2 to realize columnar sealing.

[0062] After the vacuum treatment is completed, the drawer plug 2 is pushed toward the drawer base 1 by the connecting rod 4, so that it moves toward the drawer base 1 until the drawer plug 2 enters the drawer base 1. At this time, the special-shaped protrusion 21 on the drawer plug 2 may be on the limiting piece 11 of the drawer base 1. However, since the lower part of the special-shaped protrusion 21 of the drawer plug 2 has a slope to prevent the special-shaped protrusion 21 from staying on the limiting piece 11 of the drawer base 1. Therefore, if the special-shaped protrusion 21 of the drawer plug 2 falls on the limiting piece 11 of the drawer base 1, the slope will make the drawer plug 2 slide off the limiting piece 11 of the drawer base 1. After the drawer plug 2 slides off the limiting piece 11 of the drawer base 1, the drawer plug 2 continues to move toward the drawer base 1 until the drawer plug 2 is fully inserted into the drawer base 1. At this time, the sealing ring 3 will be evenly squeezed, thereby achieving a reliable cylindrical vacuum seal. After the extraction plug 2 and the extraction base 1 are completely installed, the connecting rod 4 is rotated to separate the connecting rod 4 from the extraction plug 2. During the rotation process, when it reaches a certain position, the protrusion on the special-shaped protrusion 21 of the extraction plug 2 will be blocked by the limit stopper on the extraction base 1, and the rotation of the extraction plug 2 is restricted, so that it cannot rotate with the connecting rod 4, so that the connecting rod 4 can be easily separated from the extraction plug 2. Then, the clamp is loosened, the extraction valve 9 on the flange of the extraction base 1 is removed, and the flange cover is placed on the extraction base 1 and fixed with a clamp to prevent the extraction plug 2 from loosening due to external force, and the vacuum treatment of the target container 10 is completed.

[0063] Example 2

[0064] The present invention can be applied to fields that require vacuum processing. One of the application fields is the application of superconducting power equipment, such as superconducting motors, superconducting cables, superconducting reactors, superconducting magnets, etc. An application example of the present invention is Figure 7-Figure 9 As shown in the schematic diagram, based on Example 1, the present invention is applied to a high-temperature superconducting wind turbine. Since the superconducting components in the high-temperature superconducting wind turbine are made of high-temperature superconducting materials, the superconducting components need to be immersed in liquid nitrogen. At the same time, a double-layer container with multiple composite insulation layers and a vacuum interlayer is required to ensure the state of liquid nitrogen, such as Figure 10-12 shown.

[0065] The present invention is welded to the outer cylinder wall of the high temperature superconducting wind turbine by welding. Before vacuum treatment, Fig.13 The vacuum valve 7 shown is mounted on the flange of the outlet base 1 of the present invention. Fig.14 As shown in the schematic diagram, a vacuum gauge 5, a target container 10, a suction valve 9, a connecting pipe 6, a vacuum valve 7 and a vacuum pump 8 are connected together to form a vacuum processing system.

[0066] As a preferred embodiment, the drawer base 1 can be made of materials with good structural strength and good welding performance such as stainless steel and aluminum; the drawer plug 2 can be made of materials with good mechanical strength such as stainless steel and aluminum, and the material can also be changed according to actual needs.

[0067] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A special-shaped vacuum outlet structure, comprising an outlet base (1), an outlet plug (2), and a sealing ring (3), wherein the outlet base (1) is connected to an outlet valve (9) and a target container (10), the outlet plug (2) is located in the outlet base (1) and connected to a connecting rod (4), the connecting rod (4) passes through one end of the outlet valve (9), and the sealing ring (3) is located between the outlet plug (2) and the outlet base (1), characterized in that: A special-shaped protrusion (21) is provided at the edge of the upper surface of the draw-out plug (2), and the special-shaped protrusion (21) is an asymmetric protrusion with one side being a broken line and the other side being a smooth arc line; A limiting piece (11) is provided inside the drawer base (1), and the limiting piece (11) cooperates with the special-shaped protrusion (21) of the drawer plug (2); the number of the special-shaped protrusions (21) is one or more, and the number of the limiting pieces (11) is consistent with the number of the special-shaped protrusions (21).

2. A special-shaped vacuum outlet structure according to claim 1, characterized in that: The irregular protrusion (21) is typhoon-shaped and comprises a connecting portion (211), a smooth portion (212) and a tip (213); the connecting portion (211), the tip (213) and the smooth portion (212) are sequentially connected at the edge of the upper surface of the draw-out plug (2); the connecting portion (211) and the tip (213) are connected by a broken line; the outer diameter of the edge where the smooth portion (212) is located is greater than the outer diameter of the edge where the connecting portion (211) is located.

3. The special-shaped vacuum outlet structure according to claim 1, characterized in that: The draw-out base (1) has a stepped hole extending vertically therethrough, the minimum diameter of the stepped hole being greater than the minimum outer diameter of the draw-out plug (2), and the maximum outer diameter of the draw-out plug (2) being greater than the minimum diameter of the stepped hole.

4. The special-shaped vacuum outlet structure according to claim 3, characterized in that: The length of the limiting plate (11) is smaller than the radius difference between the inner diameter of the drawer base (1) and the outer diameter of the drawer plug (2), the height of the limiting plate (11) is smaller than the depth of the maximum hole of the inner diameter of the stepped hole of the drawer base (1), and the height of the limiting plate (11) is greater than the thickness of the special-shaped protrusion (21) on the drawer plug (2).

5. The special-shaped vacuum outlet structure according to claim 3, characterized in that: The upper edge of the limiting piece (11) is provided with a chamfer, and the lower edge of the limiting piece (11) is connected to the stepped surface of the stepped hole.

6. The special-shaped vacuum outlet structure according to claim 1, characterized in that: A threaded hole is provided at the center of the upper surface of the withdrawal plug (2), and the connecting rod (4) is connected to the withdrawal plug (2) via the threaded hole.

7. The special-shaped vacuum outlet structure according to claim 1, characterized in that: The lower surface of the irregular protrusion (21) is an inclined surface, and the thickness of the inclined surface on the fold line side of the irregular protrusion (21) is smaller than the thickness on the smooth arc line side.

8. The special-shaped vacuum outlet structure according to claim 1, characterized in that: The outer surface of the draw-out plug (2) is provided with a plurality of sealing ring grooves, and the sealing ring (3) is located in the sealing ring grooves.

9. The special-shaped vacuum outlet structure according to claim 1, characterized in that: The withdrawal base (1) is connected to the target container by welding, and the withdrawal base (1) is connected to the withdrawal valve by a flange.

10. A vacuum extraction method for a special-shaped vacuum extraction structure according to any one of claims 1 to 9, characterized in that: The following steps are involved: Install the sealing ring (3) on the outer surface of the draw-out plug (2), and place the draw-out plug (2) into the draw-out base (1); The vacuum pump (8) and the evacuation valve (9) are connected via the vacuum valve (7) and the connecting pipe (6), the outlet valve (9) is connected to the outlet base (1), the rotation and movement of the outlet plug (2) in the outlet base (1) are limited by the limit plate (11), and the connecting rod (4) passes through the outlet valve (9) and is connected to the outlet base (1); Pull the connecting rod (4) upwards, so that the draw-out plug (2) is driven by the connecting rod (4) to move upwards and separate from the draw-out base (1); Starting the vacuum pump (8) to perform vacuum treatment on the target container (10); The draw-out plug (2) is pushed toward the draw-out base (1) by the connecting rod (4) until the draw-out plug (2) enters the draw-out base (1); when the draw-out plug (2) is completely inserted into the draw-out base (1), the rotation and movement of the draw-out plug (2) in the draw-out base (1) is limited by the limiting piece (11), and the connecting rod (4) is rotated to release the connection between the connecting rod (4) and the draw-out base (1); The connection between the suction port valve (9) and the suction port base (1) is released, and the connection between the suction port base (1) and the target container (10) is reinforced.

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