Sealing conduit connectors

Abstract

The present invention discloses a sealed catheter joint, comprising: a joint body, an insertion bead and a nut; the joint body comprises a main body cylinder, an outer cylinder and an inner cylinder, the outer cylinder is coaxially protruded from the main body cylinder to one side of its axial direction, the outer cylinder and the inner cylinder are surrounded to form a groove opening to one side of the axial direction, the inner cylinder is arranged on the radial inner side of the outer cylinder and is coaxially protruded from the main body cylinder in the same direction as the outer cylinder in such a way that the protruding end is closer to the main body cylinder side than the protruding end of the outer cylinder; the insertion bead comprises a cylindrical embedding end embedded in the joint body and a catheter connecting end away from the embedding end, the embedding end is detachably embedded in the inner side of the groove to form a sealing portion; the catheter connecting end is radially protruded in a direction away from the axial center; the purpose of the present invention is to provide a sealed catheter joint that can utilize the kinetic energy of the fluid flowing inside the catheter joint to make the catheter joint have better sealing performance.

Description

Technical Field

[0001] The present invention relates to a joint, and more particularly to a sealing conduit joint. Background Art

[0002] In the manufacturing process of semiconductor manufacturing, medical and pharmaceutical products manufacturing, food processing and industrial fields, various fluids (such as high-purity liquid medicine, high-purity chemical reagents, etc.) are required, and these fluids must be transported through catheters in machines and equipment. Catheter connectors are required to connect the catheters and the catheters and the equipment. If the sealing of the catheter connector is not good enough or does not meet the standards, leakage will occur at the connector. Obviously, this situation cannot occur, so a catheter connector with excellent sealing effect is needed to avoid such a situation.

[0003] At present, in the Japanese patent document with the publication number JP2799562B2, a resin pipe joint is disclosed, including a joint body, a sleeve and a fastener; when it is used, the catheter is sleeved on one end of the sleeve, and then the other end of the sleeve is connected to the joint body, and finally the catheter and the sleeve are further fastened to the joint body using the fastener, so as to achieve a sealing connection effect at the catheter joint.

[0004] In the invention patent document with the authorization announcement number CN1064461130B, a resin pipe joint is disclosed, which also includes a joint body, a sleeve and a fastener. When in use, the catheter is sleeved on one end of the sleeve, and the other end of the sleeve is connected to the joint body. Finally, the catheter and the sleeve are further fastened to the joint body using a fastener. In this scheme, the insertion rate and magnification of the insertion part into the groove part are further limited, so as to achieve a better sealing effect.

[0005] It can be seen that in the prior art solutions, only the characteristics of the catheter joint material and the characteristics of part of the structure are used to improve the sealing effect when the catheter is connected. Summary of the invention

[0006] In view of the shortcomings of the prior art, the object of the present invention is to provide a sealed catheter joint that can utilize the kinetic energy of the fluid flowing inside the catheter joint to make the catheter joint have better sealing performance.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a sealed catheter joint, comprising: a joint body, an insertion bead and a nut; the joint body comprises a main body cylinder, an outer cylinder and an inner cylinder, the outer cylinder is coaxially protruded from the main body cylinder to one side of its axial direction, the outer cylinder and the inner cylinder are surrounded to form a groove opening to one side of the axial direction, the inner cylinder is arranged on the radial inner side of the outer cylinder and is coaxially protruded from the main body cylinder in the same direction as the outer cylinder in such a way that the protruding end is closer to the main body cylinder side than the protruding end of the outer cylinder; the insertion bead comprises an insertion end which is embedded in the joint body and is in a cylindrical shape, and a catheter connecting end away from the insertion end, the insertion end is detachably embedded in the inner side of the groove to form a sealing portion; the catheter connecting end is radially protruded in a direction away from the axial center; the nut is threadedly connected to the joint body; the joint body and the insertion bead are both provided with a flow channel for fluid circulation; the catheter joint is characterized in that an annular ring is provided in the inner circumferential direction of the flow channel inside the insertion bead, and the annular ring is protruded in the axial direction of the insertion bead.

[0008] The present invention is further configured such that: the annular ring is at least partially arranged at a position in the flow channel corresponding to the connection end of the conduit.

[0009] The present invention is further configured such that: the annular ring is stepped along the axial cross section of the bead and extends to the embedding end or the catheter connection end of the bead.

[0010] The present invention is further configured as follows: the annular ring includes a first surface and a second surface which form a certain angle with the inner wall of the flow channel.

[0011] The present invention is further configured as follows: the first surface and the second surface are smoothly connected to the flow channel surface via curved surfaces respectively.

[0012] The present invention is further configured as follows: the first surface and the second surface are connected to a horizontal connecting surface via an arc surface.

[0013] The present invention is further configured as follows: the height of the annular ring protrusion is set to between 0.1 mm and 3 mm; and the width of the annular ring is set to at least 0.1 mm.

[0014] The present invention is further configured as follows: the angle between the first surface and the second surface and the inner wall of the flow channel is set to be between 20° and 90°.

[0015] The present invention is further configured such that the axial length of the horizontal connecting surface is set between 0.1-3 mm.

[0016] The present invention is further configured as follows: the first surface and the second surface are both configured as arc surfaces with the same curvature.

[0017] By adopting the above technical solution, during the specific use of the catheter joint, when the fluid in the flow channel flows to the position of the annular ring, the annular ring protruding radially inward is subjected to the impact force generated by the fluid on it, and its direction is the same as the flow direction of the fluid. Since the annular ring is fixed inside the flow channel, more specifically, the entire bead is integrally formed, so when the annular ring is subjected to the impact force of the fluid, it is equivalent to the bead being subjected to the impact force of the fluid along the flow direction, so that the bead has a tendency to move along the flow direction of the fluid. One end of the bead is the embedded end embedded in the joint body. If the direction of this impact force is the same as the embedding direction of the bead embedded in the joint body, the impact force of the fluid impact can be used to increase the sealing pressure on the embedded end, so that the sealing effect of the embedded end is better; if the direction of this impact force is opposite to the embedding direction of the embedded end embedded in the joint body, the bead will have a tendency to move in the direction of the nut, so that the sealing pressure of the first sealing surface formed between the bead, the catheter and the nut is increased, thereby using the impact force of the fluid impact to enhance the sealing effect of the first sealing surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings:

[0019] Figure 1 This is a schematic structural diagram of a first embodiment of a sealed conduit connector according to the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the bead in the first embodiment of the sealed catheter connector of the present invention;

[0021] Figure 3 It is a schematic diagram of the structure of fixing the bead, nut and catheter in the first embodiment of the sealed catheter joint of the present invention;

[0022] Figure 4 A schematic diagram of the cross-sectional shape of the bead-entering annular ring in the second embodiment of the sealed conduit connector of the present invention;

[0023] Figure 5 This is a schematic diagram of the structure of the bead in the third embodiment of the sealed catheter connector of the present invention;

[0024] Figure 6 This is a schematic diagram of the structure of fixing the bead, nut and catheter in the third embodiment of the sealed catheter joint of the present invention;

[0025] Figure 7 Schematic diagram of the cross-sectional shape of the bead-entry annular ring in the third embodiment of the sealed conduit connector of the present invention;

[0026] Figure 8 This is a structural schematic diagram of a bead-injection in a fourth embodiment of a sealed catheter connector of the present invention;

[0027] Fig. 9It is a schematic diagram of the structure of fixing the bead, nut and catheter in the fourth embodiment of the sealed catheter joint of the present invention;

[0028] Fig.10 A schematic diagram of the cross-sectional shape of the bead-entering annular ring in the fourth embodiment of the sealed conduit connector of the present invention;

[0029] Fig.11 This is a schematic structural diagram of the bead-injection of the fifth embodiment of the sealed catheter connector of the present invention;

[0030] Fig.12 It is a schematic diagram of the structure of fixing the bead, nut and catheter in the fifth embodiment of the sealed catheter joint of the present invention;

[0031] Fig.13 A schematic diagram of the cross-sectional shape of the bead-entering annular ring in the fifth embodiment of the sealed catheter connector of the present invention;

[0032] Fig.14 This is a structural schematic diagram of the bead of the sixth embodiment of the sealed catheter connector of the present invention;

[0033] Fig.15 This is a structural schematic diagram of the bead in Embodiment 7 of the sealed catheter connector of the present invention;

[0034] Fig.16 It is a schematic diagram of the fluid flowing from left to right in Example 1;

[0035] Fig.17 It is a schematic diagram of the fluid flowing from right to left in Example 1.

[0036] In the figure: 1. joint body; 11. main body cylinder; 12. outer cylinder; 13. inner cylinder; 14. groove; 2. bead; 21. embedding end; 22. catheter connection end; 3. nut; 4. catheter; 5. flow channel; 6. first sealing surface; 7. annular ring; 71. first surface; 72. second surface; 73. horizontal connection surface; 74. arc surface. DETAILED DESCRIPTION

[0037] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0038] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0039] Reference Figures 1 to 17 An embodiment of a sealed conduit joint of the present invention is further described.

[0040] Embodiment 1:

[0041] like Figure 1 , Figure 2 and Figure 3 A sealed conduit joint shown in the figure comprises a substantially cylindrical joint body 1, a substantially cylindrical bead 2 and a substantially cylindrical nut 3, one end of the bead 2 is detachably sealedly connected to the joint body 1, and a sealing portion is formed at the position where the bead 2 is embedded in the joint body 1; the other end of the bead 2 is connected to a conduit 4, the nut 3 is threadedly connected to the joint body 1, and when connected, the conduit 4 is fastened to the joint body 1 by squeezing the bead 2, and a first sealing surface 6 is formed at the surface of the bead 2 against the conduit 4 and the nut 3; a flow channel 5 for fluid circulation is provided inside the joint body 1 and the bead 2, and an annular ring 7 is further provided circumferentially in the flow channel 5 at the conduit connection end 22, and the annular ring 7 is provided protrudingly toward the axial direction of the bead 2. Since the annular ring 7 is a structure that is often subjected to fluid impact during use, the annular ring 7 is provided at a thicker part of the flow channel 5 corresponding to the conduit connection end 22 of the bead 2.

[0042] In this embodiment, the cross-sectional shape of the annular ring 7 along the axial section of the bead 2 is set to be an isosceles triangle, and the inclined surfaces corresponding to the two waistlines are respectively the first surface 71 and the second surface 72, and the acute angle between the first surface 71 and the second surface 72 and the inner surface of the flow channel 5 is set to 60°. Furthermore, the height of the annular ring 7 is set to 1 mm to ensure that the annular groove can better receive the impact force of the fluid in the flow channel 5 on it.

[0043] In this embodiment, the connector body 1 includes a main body cylinder portion 11, an outer cylinder portion 12 and an inner cylinder portion 13, and a groove portion 14 opening to one side in the axial direction is formed between the outer cylinder portion 12 and the inner cylinder portion 13, and the opening direction of the groove portion 14 is toward the side of the entry bead 2; and a chamfer is provided inwardly at one end of the outer cylinder portion 12 away from the main body cylinder portion 11 to facilitate the embedding of the entry bead 2; further, the entry bead 2 includes an embedding end 21 embedded in the connector body 1 and a catheter connecting end 22 away from the embedding end 21 and connected to the catheter 4, wherein a sealing portion is formed by the embedding cooperation of the embedding end 21 and the groove portion 14, thereby realizing a detachable sealed connection between the entry bead 2 and the connector body 1.

[0044] In this embodiment, the conduit connection end 22 of the bead 2 is protruded in the direction away from the axis; the inner diameter of the nut 3 away from the joint body 1 is larger than the inner diameter of the bead 2 and smaller than the maximum outer diameter of the protrusion of the connection end. Such a setting enables the edge of the nut 3 to press the protruding surface of the conduit connection end 22 of the bead 2 through the conduit 4 when tightened; at the same time, such a setting makes the conduit connection end 22 and the conduit 4 sleeved on its surface more difficult to fall off. Such a connection method forms a first sealing surface 6 between the conduit 4 and the conduit connection end 22. Furthermore, in this embodiment, we set the outer surface of the protruding conduit connection end 22 as an inclined surface, and set a horizontal end surface on its outer surface. The horizontal end surface is used to increase the contact area between the protruding part of the conduit connection end 22 and the conduit 4, increase the friction between the conduit 4, make it difficult to fall off, and at the same time blunt the sharp angle of the original protrusion, reduce damage to the conduit 4, and increase its service life.

[0045] In the specific use process, according to the different flow directions of the fluid inside the catheter connector, it is generally divided into two working conditions.

[0046] Working condition 1: The fluid flows out from the connector body 1, flows through the inlet bead 2, and finally flows into the conduit 4.

[0047] like Fig.16 As shown, the flow direction of the fluid is V1. When the fluid flows to the annular ring 7, an impact force is generated on the annular ring 7. Since the annular ring 7 and the inlet bead 2 are integrated, the impact force of the fluid generates a horizontal rightward impact force on the inlet bead 2. Under the action of this impact force, the sealing pressure at the first sealing surface 6 is increased, thereby utilizing the impact force of the fluid to improve the sealing effect of the entire sealed catheter joint.

[0048] Working condition 2: The fluid flows in from the conduit 4, flows through the inlet bead 2, and finally flows into the connector body 1.

[0049] like Fig.17 As shown, the flow direction of the fluid is V2. When the fluid flows to the annular ring 7, an impact force is generated on the annular ring 7. Since the annular ring 7 and the bead 2 are integrated, the impact force of the fluid generates a horizontal left impact force on the bead 2. Under the action of this impact force, the embedded end 21 of the bead 2 can obtain a horizontal left force in the embedding direction, thereby improving the sealing of the bead 2 embedded in the joint body 1, that is, improving the sealing of the sealing part, thereby improving the overall sealing effect of the entire sealed catheter joint.

[0050] The above two working conditions are general situations in the specific use process, and are also applicable to all subsequent embodiments.

[0051] Embodiment 2:

[0052] like Figure 4 The sealing conduit joint shown in the figure is different from the first embodiment in that the connection between the annular ring 7 of the flow channel 5 inside the bead 2 and the flow channel 5 forms an arc surface 74, that is, the first surface 71 and the inner wall of the flow channel 5 are smoothly connected through the arc surface 74, and the second surface 72 and the inner wall of the flow channel 5 are also smoothly connected through the arc surface 74. Such a setting can ensure the smoothness of the inside of the flow channel 5 and minimize the impact on the flow performance of the fluid inside it.

[0053] Embodiment three:

[0054] like Figure 5 , Figure 6 and Figure 7 The structure diagram of the sealing conduit joint of the third embodiment is shown. The difference between the third embodiment and the second embodiment is that in this embodiment, the cross-sectional shape of the annular ring 7 is set to a rectangle, that is, a horizontal connecting surface 73 is connected between the first surface 71 and the second surface 72. Compared with the second embodiment, when the fluid in the flow channel 5 receives the same pressure and flows through the annular ring 7, the annular ring 7 of the shape in the third embodiment can receive a greater fluid impact force, thereby ensuring that a greater sealing pressure can be generated by utilizing the fluid impact force, so that the sealing effect is better. However, compared with the shape of the annular ring 7 in the first and second embodiments, the protrusion of the annular ring 7 is more likely to break, so it is not suitable for some high-pressure and long-term working conditions. Here, the connection between the first surface 71, the second surface 72 and the horizontal connecting surface 73 can also be set to an arc surface 74 to reduce the wear on the annular ring 7 and increase the service life of the product.

[0055] Embodiment 4:

[0056] like Figure 8 , Fig. 9 and Fig.10 The structure diagram of the sealing conduit joint of the fourth embodiment is shown. In this embodiment, the difference from the first to third embodiments is only that the cross-sectional shape of the annular ring 7 is different. In this embodiment, the cross-section of the annular ring 7 is set to an isosceles trapezoid, and the acute angle between the first surface 71, the second surface 72 and the flow channel 5 is 60°. And the connection between the first surface 71, the second surface 72 and the horizontal connecting surface 73 can be set to an arc surface 74, and the connection between the first surface 71, the second surface 72 and the inner wall of the flow channel 5 is set to an arc surface 74. Compared with the third embodiment, the trapezoidal cross-sectional setting here enhances the structural strength of the annular ring 7, enabling it to withstand greater or longer fluid impacts. The setting of the arc surface 74 can also ensure the overall smoothness of the flow channel 5, minimizing the impact on the fluid flow.

[0057] Embodiment five:

[0058] like Fig.11 , Fig.12 and Fig.13 The structure diagram of the sealed conduit joint of the fifth embodiment is shown. In this embodiment, the difference from the first to fourth embodiments is only the cross-sectional shape of the annular ring 7. In this embodiment, the cross-sectional shape of the annular ring 7 is set to be an arc, that is, the first surface 71 and the second surface 72 are both set to be arc surfaces 74, and the curvature is the same. At the same time, the connection between the first surface 71, the second surface 72 and the inner wall of the flow channel 5 can also be set to be an arc surface 74 to ensure the smoothness of the inside of the flow channel 5.

[0059] Embodiment six:

[0060] like Fig.14 The structure diagram of the sealed conduit joint of the sixth embodiment is shown. In this embodiment, the annular ring 7 is arranged in a raised step shape, that is, it only includes the first surface 71. At the same time, the annular ring 7 extends all the way to the side of the inlet bead 2 close to the joint body 1. Compared with the first embodiment, this arrangement has the advantage that the annular ring 7 can withstand a greater impact force of the fluid and has a longer service life, but the disadvantage is that this method is affected by the flow direction of the fluid and can only achieve a better sealing effect when the fluid flows from right to left.

[0061] Embodiment seven:

[0062] like Fig.15 The structure diagram of the sealing conduit joint of the seventh embodiment is shown. In this embodiment, the annular ring 7 is arranged in a raised step shape, that is, it only includes the second surface 72. At the same time, the annular ring 7 extends all the way to the side of the bead 2 close to the nut 3. Compared with the first embodiment, this arrangement has the advantage that the annular ring 7 can withstand a greater impact force of the fluid and has a longer service life, but the disadvantage is that this method is affected by the flow direction of the fluid and can only achieve a better sealing effect when the fluid flows from left to right.

[0063] Considering the service life of the whole product and the adaptability of the product, according to the stress condition of the cross section of the annular ring 7, it can be found that the cross section of the annular ring 7 is set to Fig.10 As shown in , the shape in the fourth embodiment is the optimal solution, and the angle between the first surface 71, the second surface 72 and the inner wall of the flow channel 5 is set to 45° to enhance the structural strength of the annular ring 7 while ensuring that it is subjected to greater impact from the fluid.

[0064] Furthermore, a specific size selection experiment was conducted on the annular ring 7 whose cross-section is generally an isosceles trapezoidal shape and whose surfaces are connected by arc surfaces 74. The specific experiment is as follows:

[0065] We made 20 beads of different sizes with a cross-section height of 0.1mm and widths of 0.3mm, 0.8mm, 1.3mm, 1.8mm, and 2.3mm; a height of 1.1mm and widths of 2.2mm, 2.4mm, 2.6mm, 2.8mm, and 3.0mm; a cross-section height of 2.1mm and widths of 4.4mm, 4.6mm, 4.8mm, 5.0mm, and 5.2mm; a cross-section height of 3.0mm and widths of 6.2mm, 6.4mm, 6.6mm, 6.8mm, and 7.0mm, respectively. They are recorded as a group. There are two groups in total, and the leakage test is carried out under different working conditions. The different working conditions referred to here are 0.75MPa at room temperature and 0.097MPa at 180℃. At the same time, in order to simulate the actual working conditions, all parts of the catheter joint and the two groups of beads 2 were repeatedly heated (150℃, 1 hour) and cooled (temperature 25℃, 6 hours) 10 times before the experiment. Furthermore, we set up two experimental control groups. The catheter joints used in the control group did not have an annular ring 7 in the flow channel 5 inside the bead 2. Before the experiment, all parts of the catheter joints and beads 2 used in the two control groups were repeatedly heated (150℃, 1 hour) and cooled (temperature 25℃, 6 hours) 10 times. After that, the two groups of beads 2 were placed in the above two different working conditions for sealing tests. Finally, we concluded that the catheter joint without an annular ring 7 in the bead 2 can achieve a sealing time of 43,800 hours under the working conditions of 0.75MPa and room temperature, and the sealing time can reach 8757 hours under the working conditions of 0.097MPa and 180℃.

[0066] Table 1 below shows the leakage data of different heights and widths of the bead 2 with an annular groove section of an isosceles trapezoid and a bottom angle of 45° and a curved surface 74 under 0.75 MPa normal temperature conditions. Table 2 below shows the leakage data of different heights and widths of the bead 2 with an annular groove section of an isosceles trapezoid and a bottom angle of 45° and a curved surface 74 under 0.097 MPa 180°C conditions.

[0067] Table 1:

[0068]

[0069] Table 2:

[0070]

[0071] According to the data in the above table combined with the experimental data of the control group, we found that the main parameter affecting the sealing performance is the radial height of the annular ring 7, while its width has little effect on the sealing performance (the width here is affected by the height of the annular ring 7, the bottom angle of the annular ring 7 and the width of the horizontal connecting surface 73, and has little effect on the sealing performance, but has a certain degree of influence on the service life of the sealed catheter joint); at the same time, considering the need to minimize the impact on the flow of the fluid in the flow channel 5. We finally chose the specific setting of the annular ring 7 as follows: its cross-section is an isosceles trapezoid, with a lower bottom angle of 45°, a height of 1.1mm, a width of 2.2mm, and an axial length of the horizontal connecting surface 73 of 1.1mm, as the most preferred embodiment.

[0072] In all the above embodiments and the embodiments not mentioned, if the connection of each surface of the annular ring 7 is not set as the arc surface 74, then after long-term and high-pressure use, the fluid will easily wear the edges and corners, which will cause impurities to be generated inside the flow channel 5, affecting the specific production or experimental accuracy. In order to avoid the above problems, the connection between the annular ring 7 and the flow channel 5 and the surface bend of the annular ring 7 can be set to be connected through the arc surface 74, which reduces the phenomenon of wear due to long-term high-pressure impact, prevents impurities from being generated inside the flow channel 5, and improves its service life.

[0073] The preferred embodiments of the present invention have been described in detail above, but it should be understood that after reading the above teachings of the present invention, those skilled in the art may make various changes or modifications to the present invention. These equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A sealed conduit connector, comprising: A connector body, an insertion bead and a nut; the connector body comprises a main body cylinder, an outer cylinder and an inner cylinder, the outer cylinder protrudes coaxially from the main body cylinder to one side of its axial direction, the outer cylinder and the inner cylinder surround and form a groove opening to one side of the axial direction, the inner cylinder is arranged on the radial inner side of the outer cylinder and protrudes coaxially from the main body cylinder in the same direction as the outer cylinder in such a way that the protruding end is closer to the main body cylinder side than the protruding end of the outer cylinder; the insertion bead comprises an insertion end that is embedded in the connector body and is cylindrical and connected to a catheter away from the insertion end The connecting end, the embedded end can be detachably embedded in the inner side of the groove to form a sealing portion; the catheter connecting end is radially protruded in the direction away from the axial center; the nut is threadedly connected to the joint body; the interior of the joint body and the bead are both provided with flow channels for fluid circulation; the catheter joint is characterized in that: an annular ring is circumferentially arranged in the flow channel inside the bead, the annular ring is protruded in the axial direction of the bead, and the height of the protrusion of the annular ring is set to between 0.1mm-3mm; the width of the annular ring is set to at least 0.1mm.

2. The sealed conduit joint according to claim 1, characterized in that: The annular ring is at least partially disposed at a position in the flow channel corresponding to the connection end of the conduit.

3. The sealed conduit joint according to claim 2, characterized in that: The annular ring is stepped along the axial cross section of the bead and extends to the embedding end or the catheter connection end of the bead.

4. The sealed conduit joint according to claim 2, characterized in that: The annular ring includes a first surface and a second surface which form a certain angle with the inner wall of the flow channel.

5. The sealed conduit joint according to claim 4, characterized in that: The first surface and the second surface are smoothly connected to the flow channel surface through arc surfaces respectively.

6. The sealed conduit joint according to claim 4 or 5, characterized in that: The first surface and the second surface are connected to a horizontal connecting surface via an arc surface.

7. The sealed conduit joint according to claim 4, characterized in that: The included angles between the first surface, the second surface and the inner wall of the flow channel are set to be between 20° and 90°.

8. The sealed conduit joint according to claim 6, characterized in that: The axial length of the horizontal connecting surface is set to be between 0.1-3 mm.

9. The sealed conduit joint according to claim 4 or 5, characterized in that: The first surface and the second surface are both configured as arc surfaces with the same curvature.

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