CN118499594A - Sealing connection device - Google Patents

Abstract

The embodiment of the present application relates to a sealing connection device, including a first connection member, a second connection member, a sealing member, a bracket member, a support member and a fastener. The sealing member made of high temperature resistant material abuts against the first connection member and the second connection member, and the sealing member, the first connection member and the second connection member form a sealed channel space. The support member is connected between the first connection member and the second connection member in a first direction, and the sealing member is located between the bracket member and the support member in a second direction perpendicular to the first direction. The fastener is detachably connected to the first connection member and the second connection member, and the sealing member abuts against the first connection member and the second connection member under the action of the fastener, so that the channel space is sealed. The sealing connection device provided in the embodiment of the present application can ensure the sealing performance under high temperature, high pressure and high vacuum conditions, and further ensure the synthesis quality of high-purity and high-cleanliness electronic chemicals.

Description

Sealed connection device

Technical Field

The present application relates to the technical field of flange sealing, and in particular to a sealing connection device.

Background Art

Electronic chemicals are key electronic chemical materials obtained through wet process in the fields of integrated circuits, discrete devices, display panels, solar cells, etc. The electronic chemicals industry is based on basic chemical raw materials and is connected to the electronic information materials industry. It requires ultra-clean and high purity, has many product specifications, small amount of a single variety, fast product updates, extremely high quality control requirements, and high requirements for the cleanliness of the production and use environment. Its purity and cleanliness have a very important impact on the yield, electrical performance and reliability of downstream products.

At present, most of the domestic high-purity electronic chemical production equipment has evolved from traditional pharmaceutical and chemical equipment. There are various working conditions for the production of high-purity and high-cleanliness electronic chemicals with high production requirements. Traditional sealing structures cannot meet the sealing requirements well, which in turn affects the quality of high-purity and high-cleanliness electronic chemicals.

Summary of the invention

In view of this, an embodiment of the present application provides a sealing connection device to solve at least one problem existing in the background technology.

In a first aspect, an embodiment of the present application provides a sealing connection device, the sealing connection device is used to connect and seal a first tube and a second tube, the sealing connection device comprising:

a first connecting member, to which the first tube end is connected;

a second connecting member, to which an end of the second tube is connected, and the second connecting member and the first connecting member overlap each other in a first direction;

A sealing member, wherein the sealing member made of a high temperature resistant material abuts against the first connecting member and the second connecting member, and the sealing member, the first connecting member and the second connecting member form a sealed channel space, and the channel space communicates with the first tube and the second tube;

a bracket member, two ends of which are respectively connected to the first connecting member and the second connecting member in the first direction, the bracket member is arranged adjacent to the sealing member, and the bracket member is located in the channel space, and the bracket member is used to support the sealing member when the channel space is in a negative pressure condition;

a support member connected between the first connecting member and the second connecting member in the first direction, and the sealing member is located between the bracket member and the support member in a second direction perpendicular to the first direction, and the support member is used to support the sealing member when the channel space is under a high pressure condition;

A fastener is detachably connected to the first connecting member and the second connecting member. Under the action of the fastener, the sealing member abuts against the first connecting member and the second connecting member to form a seal for the channel space.

In combination with the first aspect of the present application, in an optional implementation, the support member is a first flange extending outward from the surface of the first connecting member; or, the support member is a second flange extending outward from the surface of the second connecting member.

In combination with the first aspect of the present application, in an optional embodiment, the support member includes a third flange extending outward from the surface of the first connecting member, and a fourth flange extending outward from the surface of the second connecting member.

In combination with the first aspect of the present application, in an optional embodiment, one of the third flange and the fourth flange is provided with a first protrusion, and the other of the third flange and the fourth flange is provided with a first mounting groove, and the first protrusion matches the first mounting groove.

In combination with the first aspect of the present application, in an optional implementation, the support member is connected to an edge of the first connecting member and/or the second connecting member.

In combination with the first aspect of the present application, in an optional implementation manner, the first connecting member is provided with a first tenon groove, the second connecting member is provided with a second tenon groove, and the first tenon groove and the second tenon groove are both connected to the channel space;

The bracket member is provided with a first tenon and a second tenon, and the first tenon and the second tenon are matched with the first tenon groove and the second tenon groove respectively.

In combination with the first aspect of the present application, in an optional embodiment, a curved surface is further provided on a side of the bracket member close to the sealing member, and when the channel space is in a negative pressure condition, the sealing member abuts against the curved surface.

In combination with the first aspect of the present application, in an optional implementation, the first tenon is welded to the first tenon groove, or the second tenon is welded to the second tenon groove.

In combination with the first aspect of the present application, in an optional implementation, the sealing member is made of metal.

In combination with the first aspect of the present application, in an optional implementation, the fastener is a clamp or a countersunk bolt.

In combination with the first aspect of the present application, in an optional implementation manner, the material of the first connecting member and the second connecting member includes hardened stainless steel, titanium or Hastelloy.

The support member in the sealing connection device provided in the embodiment of the present application is arranged adjacent to the sealing member. The support member can support the sealing member when the channel space is in a negative pressure condition, thereby preventing the sealing member from being displaced significantly in the second direction due to the large pressure, and can improve the sealing performance of the sealing connection device; the support member can support the sealing member when the channel space is in a high pressure condition, thereby preventing the sealing member from being displaced in the second direction due to the large pressure, and ensuring the sealing performance of the sealing connection device; the sealing connection device can ensure the sealing performance under high temperature, high pressure and high vacuum conditions, and further ensure the synthesis quality of high-purity and high-cleanliness electronic chemicals.

Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

FIG1 is a schematic diagram of the overall three-dimensional structure of a sealing connection device provided in an embodiment of the present application;

FIG2 is a schematic diagram of an exploded three-dimensional structure of a sealing connection device provided in an embodiment of the present application;

FIG3 is a schematic diagram of a three-dimensional structure in which a first tube and a second tube are respectively connected to a first connecting member and a second connecting member provided in an embodiment of the present application;

Fig. 4 is a schematic cross-sectional view taken along line A-A in Fig. 3;

FIG5 is a cross-sectional schematic diagram of a sealing connection device provided in another embodiment of the present application;

FIG6 is a cross-sectional schematic diagram of a sealing connection device provided in yet another embodiment of the present application;

FIG7 is a cross-sectional schematic diagram of a sealing connection device provided in yet another embodiment of the present application;

FIG8 is an enlarged view of point A in FIG4 ;

FIG. 9 is an enlarged view of point B in FIG. 5 .

Reference numerals:

a1, first tube; a2, second tube;

10. First connecting member; 1a2. Channel space; 110. First mounting hole; 120. First mortise and tenon; 20. Second connecting member; 210. Second mounting hole; 220. Second mortise and tenon; 30. Sealing member; 40. Bracket member; 410. First tenon; 420. Second tenon; 430. Arc surface; 50. Support member; 510. First flange; 520. Second flange; 530. Third flange; 531. First protrusion; 540. Fourth flange; 541. First mounting groove; 60. Fastener.

DETAILED DESCRIPTION

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

In the following description, a large number of specific details are given to provide a more thorough understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present application, some technical features known in the art are not described; that is, all features of the actual embodiments are not described here, and well-known functions and structures are not described in detail.

In the drawings, the sizes of layers, regions, elements and their relative sizes may be exaggerated for clarity. The same reference numerals denote the same elements throughout.

It should be understood that when an element or layer is referred to as "on ...", "adjacent to ...", "connected to" or "coupled to" other elements or layers, it can be directly on, adjacent to, connected to or coupled to other elements or layers, or there can be intervening elements or layers. On the contrary, when an element is referred to as "directly on ...", "directly adjacent to ...", "directly connected to" or "directly coupled to" other elements or layers, there is no intervening element or layer. It should be understood that although the terms first, second, third, etc. can be used to describe various elements, components, regions, layers and/or parts, these elements, components, regions, layers and/or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present application, the first element, component, region, layer or part discussed below can be represented as the second element, component, region, layer or part. And when the second element, component, region, layer or part is discussed, it does not indicate that the present application necessarily has the first element, component, region, layer or part.

Spatial relationship terms such as "under", "below", "below", "under", "above", "above", etc., may be used here for convenience of description to describe the relationship between an element or feature shown in the figure and other elements or features. It should be understood that in addition to the orientation shown in the figure, the spatial relationship terms are intended to include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is turned over, then the elements or features described as "under other elements" or "under it" or "under it" will be oriented as "on" other elements or features. Therefore, the exemplary terms "under" and "under" may include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or other orientations) and the spatial descriptors used herein are interpreted accordingly.

The purpose of the terms used herein is only to describe specific embodiments and is not intended to be limiting of the present application. When used herein, the singular forms "one", "an" and "said/the" are also intended to include plural forms, unless the context clearly indicates another way. It should also be understood that the terms "consisting of" and/or "comprising", when used in this specification, determine the presence of the features, integers, steps, operations, elements and/or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and/or groups. When used herein, the term "and/or" includes any and all combinations of the relevant listed items.

In order to thoroughly understand the present application, detailed steps and detailed structures will be presented in the following description to illustrate the technical solution of the present application. The preferred embodiments of the present application are described in detail below, but in addition to these detailed descriptions, the present application may also have other implementation methods.

The electronic chemical materials used as an example are precursor materials, which are required to have extremely high purity to avoid impurities affecting the performance of semiconductor devices. The synthesis conditions of precursor materials are harsh, and they are subjected to multiple working conditions such as high temperature, high pressure and high vacuum. Multiple working conditions have high requirements on synthesis equipment, especially sealing devices. The sealing performance directly affects the quality of high-purity and high-cleanliness electronic chemicals.

In response to the above technical problems, an embodiment of the present application provides a sealing connection device, which can meet the sealing performance requirements under various working conditions such as high temperature, high pressure and high vacuum; the bracket member can support the seal when the channel space is in a negative pressure condition, thereby preventing the seal from being displaced significantly in the second direction, thereby ensuring the sealing performance of the sealing connection device; the support member can support the seal when the channel space is in a high pressure condition, thereby preventing the seal from being displaced in the second direction due to the large pressure, thereby ensuring the sealing performance of the sealing connection device; in addition, the seal made of high temperature resistant material can ensure the sealing performance of the sealing connection device under high temperature conditions.

The sealing connection device provided in the embodiment of the present application is described in detail below with reference to the accompanying drawings.

Specifically, as shown in Figures 1 to 4, an embodiment of the present application provides a sealing connection device, which is used to connect and seal a first tube a1 and a second tube a2. The sealing connection device includes a first connecting member 10, a second connecting member 20, a bracket member 40, a sealing member 30, a support member 50 and a fastener 60.

Among them, the first connecting member 10 has a first mounting hole 110, and the first tube a1 is inserted into the first mounting hole 110. The second connecting member 20 has a second mounting hole 210, and the second tube a2 is inserted into the second mounting hole 210. The aperture of the first mounting hole 110 and the aperture of the second mounting hole 210 are set based on the diameter of the first tube a1 and the second tube a2. The aperture of the first mounting hole 110 and the aperture of the second mounting hole 210 can be the same or different, which is not limited in the embodiment of the present application. The second connecting member 20 overlaps with the first connecting member 10 in the first direction, and the first direction is the axial direction of the first connecting member 10. In the process of processing electronic chemicals, there are many different working conditions in the channel space 1a2.

The seal 30 made of high temperature resistant material abuts against the first connector 10 and the second connector 20. The seal 30, the first connector 10 and the second connector 20 form a sealed channel space 1a2, and the channel space 1a2 connects the first tube a1 and the second tube a2. The seal 30 abuts against the first connector 10 and the second connector 20 under the action of the fastener 60, thereby achieving the sealing of the channel space 1a2.

The two ends of the bracket member 40 are respectively connected to the first connecting member 10 and the second connecting member 20 in the first direction, and the bracket member 40 is located in the channel space 1a2. The bracket member 40 is made of metal and has a certain rigidity. When the channel space 1a2 is in a negative pressure condition, the seal 30 abuts against the bracket member 40 under the action of the negative pressure. The bracket member 40 supports the seal 30, which can prevent the seal 30 from being displaced significantly and affecting the sealing performance. In addition, when the first connecting member 10 and the second connecting member 20 are locked by the fastener 60, the bracket member 40 can also evenly distribute the pressure on the first connecting member 10 and the second connecting member 20, so as to prevent the first connecting member 10 and the second connecting member 20 from being damaged due to excessive local force.

The support member 50 is connected between the first connecting member 10 and the second connecting member 20 in the first direction, and the sealing member 30 is located between the bracket member 40 and the support member 50 in the second direction. The second direction is perpendicular to the first direction, and the support member 50 is located outside the channel space 1a2. The support member 50 is made of metal and has a certain rigidity. When the channel space 1a2 is in a high-pressure working condition, the sealing member 30 is forced to abut against the support member 50, and the support member 50 supports the sealing member 30 to prevent the sealing member 30 from being displaced by force and affecting the sealing effect.

The fastener 60 is detachably connected to the first connecting member 10 and the second connecting member 20, and is used to lock the first connecting member 10 and the second connecting member 20. Under the action of the fastener 60, the sealing member 30 abuts against the first connecting member 10 and the second connecting member 20, and forms a seal in the channel space 1a2.

Fig. 1 shows a schematic diagram of a state in which a fastener 60 locks the first connecting member 10 and the second connecting member 20. The fastener 60 shown in Fig. 1 is a clamp, and the fastener 60 can also be a countersunk bolt (not shown in the figure). The fastener 60 provided in the embodiment of the present application is convenient for disassembly and installation.

Fig. 4 shows the cross-sectional structure of the first connecting member 10, the second connecting member 20, the bracket member 40, the sealing member 30 and the supporting member 50. The sealing connection device provided in the embodiment of the present application can not only meet the sealing requirements of the electronic chemical production equipment under various working conditions, thereby ensuring the quality of high-purity and high-cleanliness electronic chemicals; it can also improve the compactness of the sealing connection device structure, thereby greatly reducing the overall mass of the sealing connection device, and having lightness.

The sealing connection device provided in the embodiment of the present application can achieve a gas volume flow rate of 1.0× ^10-13 bar× ^m3 /s under vacuum in the channel space while ensuring the sealing effect, and the pressure is greater than or equal to 5MPa. It can be understood that the helium leak detection of the sealing connection device can reach 1.0× ^10-13 bar× ^m3 /s, corresponding to high vacuum.

In an optional embodiment, when the temperature in the channel space 1a2 is between -60°C and 250°C, the seal 30 is made of high-purity PTFE (Polytetrafluoroethylene) or high-purity PFA (Polyfluoroalkoxy), and both PTFE and PFA have good resistance to chemical corrosion.

Furthermore, when the temperature in the channel space 1a2 is between -196-350°C, the seal 30 is made of metal. The metal seal 30 has high temperature and high pressure resistance. The metal material includes stainless steel, nickel, silver plating, etc. Such metals have good ductility and can be deformed under the action of external force to ensure the sealing effect.

In an optional embodiment, the first connecting member 10 and the second connecting member 20 are made of stainless steel, titanium or Hastelloy, but are not limited thereto. The first connecting member 10 and the second connecting member 20 are hardened, for example, by rolling. The hardening treatment can improve the corrosion resistance, wear resistance and indentation resistance of the first connecting member 10 and the second connecting member 20.

Furthermore, the regions of the first connector 10 and the second connector 20 communicating with the channel space 1a2 are electrochemically polished. The electrochemically polished first connector 10 and the second connector 20 can avoid precipitation of impurities and ensure the purity of electronic chemicals.

In an optional embodiment, as shown in FIG. 4 , the support member 50 is a first flange 510 extending outward from the surface of the first connecting member 10 . When the channel space 1a2 is in a high-pressure condition, the support member 50 can provide support force for the seal 30 to ensure a sealing effect.

In an optional embodiment, as shown in FIG. 5 , the support member 50 is a second flange 520 extending outward from the surface of the second connecting member 20 , and the second flange 520 has the same function as the first flange 510 .

In an optional embodiment, as shown in Fig. 6, the support member 50 includes a third flange 530 extending outward from the surface of the first connection member 10, and a fourth flange 540 extending outward from the surface of the second connection member 20. When the channel space 1a2 is in a high pressure condition, the third flange 530 and the fourth flange 540 together provide the support member 50 for the sealing member 30 to ensure the sealing effect.

In an optional embodiment, as shown in FIG. 7 , one of the third flange 530 and the fourth flange 540 is provided with a first protrusion 531 , and the other of the third flange 530 and the fourth flange 540 is provided with a first mounting groove 541 , and the first protrusion 531 matches the first mounting groove 541 .

The first protrusion 531 is embedded in the first installation groove 541 to improve the supporting capacity of the support member 50 and further ensure the sealing effect of the sealing connection device.

In an optional embodiment, the support member 50 is connected to the edge of the first connecting member 10 and/or the second connecting member 20 .

The support member 50 is formed by extending from the edges of the first connecting member 10 and the second connecting member 20 , so as to reduce the overall volume of the sealing connection device and further reduce the mass of the sealing connection device.

In an optional embodiment, as shown in Fig. 2 and Fig. 8, the first connecting member 10 is provided with a first tenon groove 120, and the second connecting member 20 is provided with a second tenon groove 220, the first tenon groove 120 and the second tenon groove 220 are respectively provided on a side surface of the communicating channel space 1a2, and the first tenon groove 120 and the second tenon groove 220 are both communicating with the channel space 1a2. The bracket member 40 is provided with a first tenon 410 and a second tenon 420, and the first tenon 410 and the second tenon 420 are matched with the first tenon groove 120 and the second tenon groove 220 respectively.

FIG8 shows a schematic diagram of the state of the seal 30 and the bracket 40 when the channel space 1a2 is in a negative pressure condition. The arrow shown in FIG8 is the force direction of the seal 30. When the channel space 1a2 is in a negative pressure condition, the external pressure of the channel space 1a2 is greater than the internal pressure. After the seal 30 is subjected to force, it abuts against the bracket 40. The bracket 40 supports the seal 30 and can prevent the seal 30 from moving significantly due to pressure, thereby ensuring the sealing effect. In addition, when installing the sealing connection device, the first tenon 410 is inserted into the first tenon groove 120, and the second tenon 420 is inserted into the second tenon groove 220. The installation and disassembly are relatively convenient, which provides convenience for subsequent cleaning.

Furthermore, a curved surface 430 is provided on one side of the seal 30, and when the channel space 1a2 is in a negative pressure condition, the seal 30 abuts against the curved surface 430. When the seal 30 abuts against the curved surface 430 under force, the curved surface 430 can provide a matching compression surface for the seal 30, and further improve the sealing effect of the seal 30.

In an optional embodiment, the first tenon 410 is welded to the first tenon groove 120 , or the second tenon 420 is welded to the second tenon groove 220 .

Connecting one end of the bracket 40 to the first connector 10 or the second connector 20 by welding can improve the support strength of the bracket 40 on the sealing member 30 and further ensure the sealing effect. In addition, welding only one end of the bracket 40 can ensure convenient disassembly of the sealing connection device.

FIG9 shows the positional relationship between the seal 30, the bracket 40 and the support 50 when the channel space 1a2 is in a high-pressure state. The arrows in FIG9 show the force directions of the seal 30 and the bracket 40 when the channel space 1a2 is in a high-pressure state. When the channel space 1a2 is in a high-pressure state, the pressure inside the channel space 1a2 is greater than the pressure outside the channel space 1a2. The seal 30 is forced to abut against the support 50, and the second flange 520 supports the seal 30, which can prevent the seal 30 from being displaced significantly and affecting the sealing effect. In this state, the bracket 40 is also subjected to force, and the bracket 40 can share the pressure on the seal 30, further ensuring the sealing effect of the sealing connection device.

In an optional embodiment, when the channel space 1a2 is in a high pressure state, the ratio of the diameter of the first mounting hole 110 and the diameter of the second mounting hole 210 to the inner diameter of the bracket member 40 is in the range of 1/4 to 1/2.

The diameter of the first mounting hole 110 corresponds to the diameter of the first tube a1. When the ratio of the diameter of the first mounting hole 110 to the inner diameter of the bracket 40 is less than 1/4, residues are easily left in the channel space 1a2, thereby reducing the synthesis purity of electronic chemicals.

When the ratio of the diameter of the first mounting hole 110 and the diameter of the second mounting hole 210 to the inner diameter of the bracket 40 is greater than 1/2, the strength of the first connecting member 10 and the second connecting member 20 will be reduced, which may affect the sealing effect of the sealing connection device.

The comparative data of the use conditions of the sealing connection device provided by the embodiment of the present application and the high vacuum flange and the high pressure flange in the prior art are shown in Table 1 below.

Table 1 shows the data of the sealing connection device of the embodiment of the present application and the flange in the prior art under different operating conditions.

It can be seen from Table 1 that the high vacuum flange in the prior art cannot be used for a long time in high pressure conditions, and similarly, the high pressure flange cannot be used for a long time in high vacuum conditions. However, the sealing connection device provided in the present application can be used for high temperature, high pressure and high vacuum flanges for a long time at the same time.

It should be understood that the above embodiments are exemplary and are not intended to include all possible implementations included in the claims. Various modifications and changes may be made on the basis of the above embodiments without departing from the scope of the present disclosure. Similarly, the various technical features of the above embodiments may be arbitrarily combined to form other embodiments of the present application that may not be explicitly described. Therefore, the above embodiments only express several implementations of the present application and do not limit the scope of protection of the patent of this application.

Claims (11)

1. A sealing connection for connecting and sealing a first pipe to a second pipe, the sealing connection comprising:

a first connector, the first tube end being connected to the first connector;

A second connection member to which the second pipe end is connected, the second connection member and the first connection member overlapping each other in a first direction;

The sealing piece is made of high-temperature resistant materials and is abutted against the first connecting piece and the second connecting piece, a sealed channel space is formed by the sealing piece, the first connecting piece and the second connecting piece, and the channel space is communicated with the first pipe and the second pipe;

The two ends of the support piece are respectively connected with the first connecting piece and the second connecting piece in the first direction, the support piece is arranged adjacent to the sealing piece and is positioned in the channel space, and the support piece is used for supporting the sealing piece under the negative pressure working condition of the channel space;

A support member connected between the first and second connection members in the first direction, and the sealing member is located between the bracket member and the support member in a second direction perpendicular to the first direction, the support member being for supporting the sealing member in a high pressure condition of the passage space;

The fastener is detachably connected with the first connecting piece and the second connecting piece, and the sealing piece is abutted with the first connecting piece and the second connecting piece under the action of the fastener, so that the channel space is sealed.

2. The sealing connection of claim 1, wherein the support is a first flange extending outwardly from the first connection surface; or the support member is a second flange extending outwardly from the second connector surface.

3. The sealing connection of claim 1, wherein the support member includes a third flange extending outwardly from the first connector surface and a fourth flange extending outwardly from the second connector surface.

4. A sealing connection as claimed in claim 3 wherein one of the third and fourth flanges is provided with a first projection and the other of the third and fourth flanges is provided with a first mounting groove, the first projection matching the first mounting groove.

5. The sealing connection according to any one of claims 1 to 4, wherein the support is connected at an edge of the first and/or second connection.

6. The sealing connection of claim 1, wherein the first connection is provided with a first tongue-and-groove and the second connection is provided with a second tongue-and-groove, both of which communicate with the channel space;

the support piece is provided with first tenon and second tenon, first tenon with the second tenon is matchd respectively first tongue-and-groove with the second tongue-and-groove.

7. The sealing connection device according to claim 1 or 6, wherein an arc-shaped surface is further arranged on one side of the support member, which is close to the sealing member, and the sealing member is abutted against the arc-shaped surface when the channel space is in a negative pressure working condition.

8. The sealed connection of claim 6, wherein the first dovetail is welded to the first dovetail slot or the second dovetail is welded to the second dovetail slot.

9. The sealing connection of claim 1, wherein the seal is a metallic material.

10. The sealing connection of claim 1, wherein the fastener is a hoop or countersunk bolt.

11. The sealing connection of claim 1, wherein the material of the first and second connection members comprises hardened stainless steel, titanium, or hastelloy.