Connecting device

Abstract

The utility model provides a connecting device which is used for connecting pipelines. The connecting device comprises two flanges, a stopping piece and a collecting piece. Each flange comprises a flange face, and the flange faces of the two flanges are attached and connected in a sealed mode. The stopping piece is arranged on the periphery of the connecting position of the two flanges in a sleeving mode and used for stopping and preventing liquid from being jetted from the connecting position of the two flanges. The two opposite ends of the collecting piece are through in the axial direction, and the collecting piece is arranged on the peripheries of the flange and the collecting piece in a sleeving mode. A collecting groove is formed between the middle of the inner circumferential wall of the collecting piece in the axial direction and the outer circumferential wall of the stopping piece in a spaced mode, and the collecting groove is communicated with the connecting position of the two flanges and used for collecting liquid. According to the connecting device, the stopping piece can stop liquid from being sprayed from the connecting position of the two flanges and prevent the liquid from being splashed all around, and the liquid stopped by the stopping piece flows along the stopping piece and flows into the collecting groove from the communicating position of the connecting position of the collecting groove and the two flanges, so that temporary storage of leaked liquid is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline connection, in particular to a connecting device. Background Art

[0002] At present, flanges are used for external connections during the filling process of cryogenic liquids. Due to the influence of the cryogenic medium and the influence of the filling pressure fluctuations, the pressure on the flange sealing surface is insufficient, and the cryogenic liquid is prone to leak outward in the form of a jet. The splashing liquid will be sprayed onto nearby equipment and other structures, affecting the safe use of the equipment. Therefore, nearby equipment needs to be protected, and cooling and heat insulation need to be considered separately.

[0003] During the use of cryogenic liquids, they are connected to other equipment through flanges. Under the dual influence of alternating loads of hot and cold cycles and low-temperature contraction of pipelines, leakage is inevitable. At the same time, in the case of large leakage, it affects the workers' on-site operation and tightening, increasing the difficulty of maintenance. Utility Model Content

[0004] The purpose of the utility model is to provide a connecting device for connecting pipes, and the connecting device can prevent liquid at the connection point from splashing everywhere.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] According to one aspect of the present application, the present application provides a connecting device for connecting pipelines, the connecting device comprising:

[0007] Two flanges, each flange comprising a flange surface, the flange surfaces of the two flanges being in contact with each other and sealed;

[0008] A stopper and a collecting member, wherein the stopper is sleeved on the outer periphery of the connection between the two flanges, and is used to block and prevent liquid from being sprayed from the connection between the two flanges; the collecting member passes through the opposite ends along the axial direction, and the collecting member is simultaneously arranged around the outer periphery of the flange and the stopper; a collecting groove is formed between the middle part of the inner circumferential wall of the collecting member and the outer circumferential wall of the stopper along the axial direction, and the collecting groove is communicated with the connection between the two flanges and is used to collect liquid.

[0009] In some embodiments, the end portion of the first end of the stopper abuts against the inner side wall of the first end of the collecting member.

[0010] In some embodiments, the stopper includes a stop portion and an annular portion, the stop portion is arranged around the outer circumference of the connection between the two flanges, and the annular portion is connected to the second end portion of the stop portion.

[0011] In some embodiments, a liquid-conducting gap is provided on the axially extending surface of the stopper, and the collecting groove is communicated with the connection between the two flanges through the liquid-conducting gap;

[0012] The stopper is sleeved on the outer periphery of the connection between the two flanges in a state where the liquid guide gap is located at the bottom.

[0013] In some embodiments, the stopper includes a first stop unit and a second stop unit, the first stop unit and the second stop unit are spliced ​​together, and a seam between the first stop unit and the second stop unit forms the liquid guiding gap;

[0014] The first stop unit and the second stop unit are spliced ​​with each other in a state where the seams are distributed up and down, and are respectively connected to the flanges.

[0015] In some embodiments, the collecting member includes an end plate, a peripheral side plate and a protrusion, the end plate and the protrusion are arranged at opposite ends of the peripheral side plate, the peripheral side plate is arranged around the outer periphery of the stop member, the middle part of the protrusion is open, the inner diameter of the protrusion is smaller than the inner diameter of the peripheral side plate, and the inner diameter of the protrusion is not smaller than the outer diameter of the stop member.

[0016] In some embodiments, the collecting member includes a first collecting unit and a second collecting unit, the first collecting unit and the second collecting unit are spliced ​​together, and the collecting tank is communicated with the outside through the splice between the first collecting unit and the second collecting unit;

[0017] The first collecting unit and the second collecting unit are spliced ​​with each other in a state where the seams are distributed in a horizontal direction, and are respectively connected to the flanges.

[0018] In some embodiments, an air guide gap is provided on the collecting member, and the collecting tank is communicated with the outside through the air guide gap;

[0019] The collecting member is disposed around the outer periphery of the flange and the stopper at the same time with the air guide gap being located at the upper portion.

[0020] In some embodiments, the connecting device includes a connecting piece, and the connecting piece is simultaneously provided through the collecting piece, the two flanges and the stopper along the axial direction of the flange.

[0021] In some embodiments, the flange includes a flange plate and a connecting unit protruding from the middle of one end of the flange plate, and the flange surface is located at the other end of the flange plate; the outer diameter of the connecting unit is smaller than the outer diameter of the flange plate;

[0022] The first end of the stopper is open, and the diameter of the opening of the first end of the stopper is adapted to the outer diameter of the flange; the second end of the stopper is provided with a through hole, and the inner diameter of the through hole is adapted to the outer diameter of the connecting unit;

[0023] The first end of the collecting member is provided with a through hole, the inner diameter of the through hole is adapted to the outer diameter of the connecting unit; the second end of the collecting member is open, and the stopper extends into the interior of the collecting member from the second end opening of the collecting member.

[0024] It can be seen from the above technical solution that the present invention has at least the following advantages and positive effects:

[0025] In the present invention, the connecting device includes two flanges, a stopper, and a collecting member. Each flange includes a flange surface, and the flange surfaces of the two flanges are in contact and sealed connection. The stopper is disposed around the outer periphery of the connection between the two flanges to prevent liquid from being ejected from the connection between the two flanges. The collecting member extends through opposite ends along the axial direction and is disposed around the outer peripheries of both the flanges and the stopper. A gap is formed between the inner circumferential wall of the collecting member and the outer circumferential wall of the stopper to form a collecting groove, which is in communication with the connection between the two flanges and is used to collect liquid.

[0026] In the above-mentioned connecting device, the stopper can block the liquid ejected from the connection between the two flanges to prevent the liquid from splashing everywhere. Moreover, the liquid blocked by the stopper flows along the stopper and flows into the collecting tank from the connection between the collecting tank and the two flanges to achieve temporary storage of the leaked liquid. The leaked liquid temporarily stored in the collecting member is vaporized by heat exchange with the outside world and discharged in the form of gas, thereby realizing the anti-splashing function of the connecting device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural diagram of one direction of the connecting device in this embodiment.

[0028] Figure 2 It is a structural diagram of the connecting device in another direction in this embodiment.

[0029] Figure 3 is an exploded view of the connecting device in this embodiment.

[0030] Figure 4 It is a cross-sectional view of the stopper and the collecting member in this embodiment.

[0031] The following are the descriptions of the reference numerals:

[0032] 1. Flange; 11. Flange plate; 12. Connecting unit;

[0033] 2. Stopper; 21. Stop portion; 22. Ring portion; 23. First stop unit; 24. Second stop unit;

[0034] 3. Collecting member; 31. End plate; 32. Side plate; 33. Lug; 34. First collecting unit; 35. Second collecting unit; 36. Collecting trough;

[0035] 4. Connectors;

[0036] 5. Locking parts. DETAILED DESCRIPTION

[0037] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention is capable of various variations in different embodiments without departing from the scope of the present invention, and that the descriptions and illustrations herein are intended to be illustrative in nature and not to limit the present invention.

[0038] In the description of this application, it should be understood that in the embodiments shown in the drawings, indications of directions or positional relationships (such as up, down, left, right, front, and back) are merely for the convenience of describing this application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, the indications of these directions will also change accordingly.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the described features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0040] The present application provides a connecting device for connecting pipelines.

[0041] The following describes in detail the specific embodiments of the connection device of the present application in conjunction with the accompanying drawings.

[0042] Figure 1 This is a schematic structural diagram of one direction of the connecting device in this embodiment. Figure 2 is a structural diagram of the connecting device in another direction in this embodiment, Figure 3 : is an exploded view of the connecting device in this embodiment.

[0043] refer to Figures 1 to 3The connection device includes two flanges 1, a stopper 2, and a collecting member 3. The stopper 2 is sleeved on the outer periphery of the connection between the two flanges 1 to block the liquid from being sprayed from the connection between the two flanges 1 and prevent the liquid from splashing everywhere. In addition, the collecting member 3 is axially connected at both opposite ends and is also arranged around the outer periphery of the flange 1 and the stopper 2. A gap is formed between the inner peripheral wall of the collecting member 3 and the outer peripheral wall of the stopper 2 in the axial middle to form a collecting groove 36. The collecting groove 36 is connected to the connection between the two flanges 1. The liquid blocked by the stopper 2 flows along the stopper 2 and flows into the collecting groove 36 from the connection between the collecting groove 36 and the connection between the two flanges 1 to achieve temporary storage of the leaked liquid. The leaked liquid temporarily stored in the collecting groove 36 vaporizes through heat exchange with the outside world and is discharged in the form of gas, thereby achieving the anti-splash function of the connection device. The liquid referred to here is a low-temperature liquid, which is easily vaporized into gas when heated, and the same applies hereinafter.

[0044] Each flange 1 includes a flange surface, and the flange surfaces of the two flanges 1 are in contact with each other and sealed, wherein the axes of the two flanges 1 coincide with each other after connection.

[0045] For the convenience of description, it is now stipulated that the two opposite ends along the axial direction of the flange 1 are the first end and the second end. Figure 1 and Figure 3 The viewing direction shown is used as a reference, with the left being the first end and the right being the second end.

[0046] Flange 1 comprises a flange plate 11 and a connecting unit 12 protruding from the middle of one end of flange plate 11. The flange 1 surface is located at the other end of flange plate 11. Flange plate 11 protrudes outward from connecting unit 12 along its circumference. Each flange plate 11 is circumferentially defined with multiple fixing holes, located on the outer periphery of connecting unit 12. Connecting unit 12 is designed to be connected to a pipe.

[0047] The structures of the stopper 2 and the collecting member 3 are described in detail below.

[0048] Figure 4 2 is a cross-sectional view of the stopper 2 and the collecting member 3 in this embodiment.

[0049] refer to Figures 1 to 4 In this embodiment, the first end of the stopper 2 is open, and the diameter of the opening of the first end of the stopper 2 is not less than the outer diameter of the flange 11. The second end of the stopper 2 is provided with a through hole, and the inner diameter of the through hole is adapted to the outer diameter of the connecting unit 12.

[0050] Specifically, the stopper 2 includes a stopper portion 21 and an annular portion 22. The stopper portion 21 is cylindrical, with an inner diameter no less than the outer diameter of the flange 11 of the flange 1. The axial dimension of the stopper portion 21 is no less than the sum of the axial dimensions of the two flanges 11. The stopper portion 21 can wrap around the outer circumference of the two flanges 11 to shield the connection between the two flanges 11 and prevent liquid from being sprayed from the connection between the two flanges 1. The annular portion 22 is connected to the second end of the stopper portion 21. A through hole is provided in the middle of the annular portion 22, allowing the annular portion 22 to be sleeved around the outer circumference of the connecting unit 12.

[0051] The second end of the stopper 2 is provided with a plurality of openings at intervals along the circumferential direction, and the plurality of openings are provided in a one-to-one correspondence with the plurality of fixing holes on the flange 1. Specifically, the annular portion 22 is provided with a plurality of openings at intervals along the circumferential direction.

[0052] The stopper 2 has a liquid conducting gap, which is located on the axially extending surface of the stopper 2. During actual installation and use, the stopper 2 is sleeved on the outer periphery of the connection between the two flanges 1 with the liquid conducting gap located at the bottom, and is connected to the flanges 1.

[0053] In this embodiment, the stopper 2 includes a first stopper unit 23 and a second stopper unit 24. The first stopper unit 23 and the second stopper unit 24 are identical in shape and size. The first stopper unit 23 and the second stopper unit 24 are spliced ​​together, and the gap between the first stopper unit 23 and the second stopper unit 24 forms a liquid-conducting gap. Specifically, the cross-sectional outer contour of the stopper 2 is circular, and the cross-sectional outer contours of the first stopper unit 23 and the second stopper unit 24 are both arc-shaped, and the two arcs are spliced ​​together to enclose a circle.

[0054] During actual installation, the first and second stopper units 23 and 24 are joined together with the seams extending vertically. Specifically, the first and second stopper units 213 and 214 are joined together horizontally and perpendicular to the axial direction of the flange 1, and are each fixedly connected to one of the flanges 1. This arrangement facilitates the installation or replacement of the first and second stopper units 23 and 24. Furthermore, the vertically extending seams of the first and second stopper units 23 and 24 facilitate the flow of leaked liquid along the inner circumferential wall of the stopper 2 and downward out of the interior of the stopper 2 under the action of gravity.

[0055] Continue to refer Figures 1 to 4 The collecting member 3 is passed through at both opposite ends along the axial direction, and is also arranged around the flange 1 and the outer periphery of the collecting member 3. There is a gap between the inner peripheral wall of the collecting member 3 and the outer peripheral wall of the stop member 2 along the axial direction to form a collecting groove 36.

[0056] In this embodiment, the second end of the collecting member 3 is open, the stopper 2 can extend into the interior of the collecting member 3 from the second end opening of the collecting member 3, and the end of the first end of the stopper 2 abuts against the inner side wall of the first end of the collecting member 3.

[0057] At this time, the collecting tank 36 communicates with the connection between the two flanges 1 through the liquid guide gap on the stopper 2. In this embodiment, the collecting tank 36 communicates with the connection between the two flanges 1 through the joint between the first stopper unit 23 and the second stopper unit 24.

[0058] A through hole is provided at the first end of the collecting member 3 , and the inner diameter of the through hole is adapted to the outer diameter of the connecting unit 12 .

[0059] Specifically, the collector 3 comprises an end plate 31, a peripheral side plate 32, and a flange 33. The end plate 31 and flange 33 are located at opposite ends of the peripheral side plate 32. The peripheral side plate 32 is cylindrical, with an inner diameter greater than the outer diameter of the stopper portion 21 of the stopper 2. The axial dimension of the peripheral side plate 32 is also greater than the axial dimension of the stopper portion 21, enabling the stopper 2 to be completely enclosed within it. The end plate 31 is located at the second end of the peripheral side plate 32 and has a through-hole in its center, allowing it to be fitted over the outer circumference of the connecting unit 12. The inner circumferential wall of the end plate 31 is capable of abutting against the connecting unit 12. The convex edge 33 is located at the first end of the peripheral side plate 32, and the middle part of the convex edge 33 is open. The inner diameter of the convex edge 33 is smaller than the inner diameter of the peripheral side plate 32, and the inner diameter of the convex edge 33 is not smaller than the outer diameter of the stop portion 21 of the stop member 2, so that the stop portion 21 of the stop member 2 can extend from the middle part of the convex edge 33 into the interior of the peripheral side plate 32, and the first end of the stop portion 21 abuts against the inner wall of the end plate 31.

[0060] At this time, the end plate 31, the peripheral side plate 32, the flange 33 and the stop portion 21 enclose a collection groove 36. The liquid flowing into the collection groove 36 after being blocked by the stop member 2 is vaporized by heat exchange with the outside world, and can be discharged outward in the form of gas from the gap between the inner peripheral wall of the flange 33 and the outer peripheral wall of the stop portion 21.

[0061] The first end of the collecting member 3 is provided with a plurality of connection holes along the circumferential direction, and the plurality of connection holes are arranged in a one-to-one correspondence with the plurality of fixing holes on the flange 1. Specifically, the end plate 31 is provided with a plurality of connection holes along the circumferential direction.

[0062] In this embodiment, the collecting member 3 includes a first collecting unit 34 and a second collecting unit 35. The first collecting unit 34 and the second collecting unit 35 are identical in shape and size, and are joined together, forming a seam at the joint between the first collecting unit 34 and the second collecting unit 35. Specifically, the collecting member 3 has a circular cross-sectional profile, and the first collecting unit 34 and the second collecting unit 35 both have arc-shaped cross-sectional profiles, which are joined to form a circle.

[0063] In actual installation and application, the first collection unit 34 and the second collection unit 35 are spliced ​​together with the seam distributed horizontally, that is, the first collection unit 34 and the second collection unit 35 are spliced ​​vertically and are respectively connected and fixed to the flange 1. In this case, this arrangement facilitates the installation or replacement of the first collection unit 224 and the second collection unit 225. In addition, the arrangement in which the seam between the first collection unit 224 and the second collection unit 225 is distributed horizontally can prevent the liquid in the collection tank 36 from flowing out of the seam, thereby ensuring that the leaked liquid can be temporarily stored in the collection tank 36. In addition, after the liquid in the collection tank 36 vaporizes and forms gas through heat exchange with the outside world, the gas can be discharged outward through the seam and the gap between the collection member 3 and the stopper 2, thereby accelerating the speed at which the gas in the collection tank 36 is discharged outward.

[0064] In other embodiments, the collecting member 3 can be integrally formed. Alternatively, the collecting member 3 can be provided with a gas-guiding gap, through which the collecting tank 36 communicates with the exterior, thereby accelerating the discharge of gas from the collecting tank 36. Preferably, in actual installation and application, the collecting member 3 is connected to the flange 1 with the gas-guiding gap positioned at the top.

[0065] refer to Figures 1 to 3 The connecting device also includes a connecting member 4, which is simultaneously arranged in the axial direction of the flange 1 through the collecting member 3, the two flanges 1 and the stopper 2, and can simultaneously realize the connection and fixation between the collecting member 3, the two flanges 1 and the stopper 2.

[0066] In this embodiment, there are multiple connecting members 4 , and the multiple connecting members 4 are arranged in a one-to-one correspondence with the multiple connecting holes.

[0067] Specifically, each connecting member 4 passes through the connecting hole on the collecting member 3 , the fixing hole on each flange 1 and the opening on the stopper 2 at the same time.

[0068] The connection device also includes a locking member 5, which is sleeved around the outer periphery of the connecting member 4 and threadedly connected to the connecting member 4. Specifically, the locking member 5 has two opposing ends extending through it, and its inner circumference is provided with internal threads. At least a portion of the outer periphery of the connecting member 4 is provided with external threads that match the internal threads, allowing the locking member 5 to be threadedly connected to the connecting member 4.

[0069] In this embodiment, the connecting member 4 is a bolt, and the locking member 5 is a nut.

[0070] An example of one of the connection methods of the above-mentioned connecting device is listed as follows: first, the stopper 2 is moved from the second end to the first end to be sleeved on the outer periphery of the two flanges 1, so that the stop portion 21 of the stopper 2 is completely covered on the outer periphery of the two flange plates 11; then, the collecting member 3 is moved from the first end to the second end to be sleeved on the outer periphery of the collecting member 3, so that the first end of the stopper 2 abuts against the inner wall of the end plate 31 of the collecting member 3; the connecting member 4 is moved from the first end to the second end, so that it passes through the connecting hole on the collecting member 3, the fixing holes on each flange 1 and the opening on the stopper 2 in sequence, and then the locking member 5 is sleeved on the second end of the connecting member 4 and screwed to the connecting member 4.

[0071] It can be seen from the above technical solution that the present invention has at least the following advantages and positive effects:

[0072] In the connection device of the present application, the stopper is sleeved on the outer periphery of the connection between the two flanges, and is used to block the liquid ejected from the connection between the two flanges to prevent the liquid from splashing everywhere. In addition, the collecting member is passed through at opposite ends along the axial direction, and is sleeved on the outer periphery of the flange and the stopper at the same time. There is a gap between the middle part of the inner peripheral wall of the collecting member and the outer peripheral wall of the stopper along the axial direction to form a collection groove, and the collection groove is connected to the connection between the two flanges. The liquid blocked by the stopper flows along the stopper and can flow into the collection groove from the connection between the collection groove and the connection between the two flanges to achieve temporary storage of the leaked liquid. The leaked liquid temporarily stored in the collection groove is vaporized by heat exchange with the outside world and discharged in the form of gas, thereby achieving the anti-splashing function of the connection device.

[0073] While the present invention has been described with reference to several exemplary embodiments, it should be understood that the terms used are illustrative and exemplary rather than restrictive. Since the present invention can be embodied in a variety of forms without departing from the spirit or essence of the invention, it should be understood that the above-described embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope of the appended claims. Therefore, all changes and modifications that fall within the scope of the claims or their equivalents are intended to be covered by the appended claims.

Claims

1. A connecting device for connecting pipelines, characterized in that: The connecting device comprises: Two flanges, each flange comprising a flange surface, the flange surfaces of the two flanges being in contact with each other and sealedly connected; A stopper and a collecting member, wherein the stopper is sleeved on the outer periphery of the connection between the two flanges to block and prevent liquid from spraying from the connection between the two flanges; the collecting member is passed through at opposite ends along the axial direction, and the collecting member is simultaneously arranged around the outer periphery of the flange and the stopper; a collecting groove is formed between the middle part of the inner circumferential wall of the collecting member along the axial direction and the outer circumferential wall of the stopper, and the collecting groove is communicated with the connection between the two flanges to collect liquid.

2. The connection device according to claim 1, characterized in that: The end portion of the first end of the stopper abuts against the inner side wall of the first end of the collecting member.

3. The connection device according to claim 2, characterized in that: The stopper comprises a stopper portion and an annular portion, wherein the stopper portion is arranged around the outer circumference of the connection between the two flanges, and the annular portion is connected to the second end portion of the stopper portion.

4. The connection device according to claim 1, characterized in that: A liquid-conducting gap is provided on the surface of the stopper extending in the axial direction, and the collecting groove is communicated with the connection between the two flanges through the liquid-conducting gap; The stopper is sleeved on the outer periphery of the connection between the two flanges in a state where the liquid guiding gap is located at the bottom.

5. The connection device according to claim 4, characterized in that: The stopper comprises a first stopper unit and a second stopper unit, the first stopper unit and the second stopper unit are spliced ​​with each other, and a joint between the first stopper unit and the second stopper unit forms the liquid guiding gap; The first stop unit and the second stop unit are spliced ​​with each other in a state where the splicing seams are distributed up and down, and are respectively connected to the flanges.

6. The connection device according to claim 1, characterized in that: The collecting member includes an end plate, a peripheral side plate and a convex edge, wherein the end plate and the convex edge are arranged at opposite ends of the peripheral side plate, the peripheral side plate is arranged around the outer periphery of the stop member, the middle part of the convex edge is open, the inner diameter of the convex edge is smaller than the inner diameter of the peripheral side plate, and the inner diameter of the convex edge is not smaller than the outer diameter of the stop member.

7. The connection device according to claim 1, characterized in that: The collecting member comprises a first collecting unit and a second collecting unit, the first collecting unit and the second collecting unit are spliced ​​with each other, and the collecting tank is communicated with the outside through the splicing seam between the first collecting unit and the second collecting unit; The first collecting unit and the second collecting unit are spliced ​​with each other in a state where the splicing seams are distributed in a horizontal direction, and are respectively connected to the flanges.

8. The connection device according to claim 1, characterized in that: The collecting member is provided with an air-guiding gap, and the collecting groove is communicated with the outside through the air-guiding gap; The collecting member is disposed around the outer circumference of the flange and the stopper at the same time with the air guide gap being located at the upper part.

9. The connection device according to claim 1, characterized in that: The connecting device comprises a connecting piece, and the connecting piece is simultaneously penetrated through the collecting piece, the two flanges and the stopper along the axial direction of the flange.

10. The connection device according to claim 1, characterized in that The flange comprises a flange plate and a connection unit protruding from the middle of one end of the flange plate, and the flange surface is located at the other end of the flange plate; the outer diameter of the connection unit is smaller than the outer diameter of the flange plate; The first end of the stopper is open, and the diameter of the opening of the first end of the stopper is adapted to the outer diameter of the flange; the second end of the stopper is provided with a through hole, and the inner diameter of the through hole is adapted to the outer diameter of the connecting unit; The first end of the collecting member is provided with a through hole, the inner diameter of which matches the outer diameter of the connecting unit; the second end of the collecting member is open, and the stopper extends into the interior of the collecting member from the opening of the second end of the collecting member.

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