Resin sealing conduit joint

Abstract

The utility model provides a resin sealing guide pipe connector which comprises a connector body, an inner ring and a nut. A plug part is formed on the inner ring, a slot part is formed on the joint main body, the plug part is inserted into the slot part to form sealed connection, the nut is connected with the joint main body to keep the insertion state of the plug part and the slot part, and the nut is in a compressed state on the inner ring; in the free state, the thickness of the plug part is linearly reduced in the axial direction of the inner ring, in the inserting state, the inserting groove part elastically deforms, and the reducing rate of the inserting groove part is smaller than that of the plug part in the free state. The beneficial effects of the utility model are that the theta is greater than the alpha, thereby not only guaranteeing the sealing effect between the plug part and the slot part, but also reducing the frictional resistance which needs to be overcome when the plug part and the slot part are combined; and secondly, the inner ring can be separated from the joint main body by using a relatively small force, and the compression ratio of the inner ring is not reduced when the inner ring is jointed again, so that the reliability and durability of sealing can be ensured.

Description

Technical Field

[0001] The utility model relates to a resin-made sealed conduit joint. Background Art

[0002] Resin pipe joints are known for use in manufacturing equipment in technical fields such as semiconductor manufacturing, medical / pharmaceutical manufacturing, food processing, and the chemical industry. These resin pipe joints are used to connect pipes for circulating fluids such as ultrapure water or liquid medicine to other pipes or fluid equipment, and can be joined to the pipes.

[0003] US Patent US5743572A and Chinese Patent CN 109642694 B both disclose the structure of the connector, which is mainly composed of a connector body, an inner ring and a nut. Figure 1 As shown, the joint body a forms a groove portion b, the inner ring c forms an insertion portion d, and the insertion portion d is inserted into the groove portion b. The groove width D1 of the groove portion b remains unchanged along the insertion direction, and the wall thickness T0 of the insertion portion d remains unchanged along the insertion direction, and T0>D1.

[0004] During use, we found that this structural method has many shortcomings. 1. The insertion part and the groove part are horizontally plugged in, and the plug-in resistance is large. During insertion, the friction resistance that the inner ring restriction surface needs to overcome is large, resulting in the need to forcefully press the inner ring insertion part. The contact surface is easily damaged during assembly and disassembly relative movement, shortening the service life. Assembly and disassembly are very laborious. The insertion part wears during assembly and disassembly relative movement, and the more times it is plugged in and out, the more wear it will cause. The compression rate of the inner ring will also decrease accordingly during the next assembly, and the sealing reliability will be reduced. In addition, the large friction resistance leads to a large tightening torque for the nut, making it difficult to tighten by hand. 2. After the forcefully pressed inner ring has been in this state for many years, if you want to remove the catheter from the connector, you need to pull the catheter in the direction of separation of the connector body, which can easily cause the catheter to separate from the inner ring. However, the inner ring may still remain on the connector body due to the large friction resistance. If this happens, when re-engaging the removed catheter with the connector, you have to use pliers to pull out the inner ring that is still connected to the connector body. This may not only damage the inner ring, but also cause the close contact between the separated inner ring and catheter to weaken when they are re-engaged, thereby reducing the sealing between the two and making it virtually impossible to re-engage the catheter and connector. Utility Model Content

[0005] The purpose of the utility model is to disclose a resin sealed conduit joint, first, the plug portion is provided with an inclination angle θ, and θ is greater than the angle α of the elastic deformation of the slot portion when plugged in, which not only ensures the sealing effect between the plug portion and the slot portion, but also makes it easier for the plug portion to be positioned in the slot portion for plugging in, and also reduces the friction resistance that the inner ring restriction surface needs to overcome when the plug portion and the slot portion are combined. The friction resistance gradually changes from small to large, the contact surface is not easily damaged, and the service life of the joint body and the inner ring is extended. The overall friction resistance between the plug portion and the slot portion is small, and only a small torque needs to be applied to tighten the nut; second, because the cross section of the inner ring plug portion is conical The plug part has the largest stroke at the front end and the smallest compression when inserted, and the plug part has the largest compression and the smallest stroke when inserted at the rear end. During disassembly, the rear end with the largest compression is first separated from the slot part. Thus, while keeping the inner ring and the catheter connected, the inner ring can be detached from the connector body with a relatively small force, reducing the damage to the inner ring during each assembly and disassembly process, thereby increasing the service life of the inner ring after multiple assembly and disassembly, and making each assembly and disassembly relatively labor-saving, so that the catheter and the connector can be re-engaged more labor-saving, reliably and easily. When re-engaged, the compression rate of the inner ring will not decrease, which can ensure the reliability and durability of the seal.

[0006] To achieve the above-mentioned objectives, the present invention provides a resin-made sealed conduit joint, comprising a joint body, an inner ring, and a nut; the inner ring is formed with a plug portion, the joint body is formed with a slot portion, the plug portion is inserted into the slot portion to form a sealed connection, the nut is connected to the joint body to maintain the plugged-in state of the plug portion and the slot portion, and the nut is in a pressing state against the inner ring; in a free state, the thickness of the plug portion linearly changes diameter along the axial direction of the inner ring, and in a plugged-in state, the slot portion undergoes elastic deformation, and the diameter change rate of the slot portion is less than the diameter change rate of the plug portion in the free state.

[0007] In some embodiments, in the free state, the inner circumference of the plug portion and the inner ring axis form an angle θ, and in the plugged state, the slot portion undergoes elastic deformation, and the outer circumference of the slot portion and the inner ring axis form an angle α, and the angle θ is greater than the angle α.

[0008] In some embodiments, 0<θ<15°.

[0009] In some embodiments, T2>T1≥D, where D is the width of the slot portion, T1 is the thickness of the plug portion before insertion, and T2 is the thickness of the plug portion before insertion.

[0010] In some embodiments, in the plugged state, the compression rate of the plug portion gradually decreases along the insertion direction, the compression rate of the plug portion at the front end of the insertion is greater than or equal to 0, and the compression rate of the plug portion at the rear end of the insertion is less than or equal to 40%.

[0011] In some embodiments, in the free state, the outer peripheral surface of the plug portion and the axis of the inner ring form a certain angle.

[0012] In some embodiments, the joint body includes a cylindrical portion, and an outer cylindrical portion and an inner cylindrical portion extending axially outward are formed on one side of the cylindrical portion. The extension length of the outer cylindrical portion is greater than the extension length of the inner cylindrical portion, and the slot portion is formed by the cylindrical portion, the outer cylindrical portion and the inner cylindrical portion.

[0013] In some embodiments, a catheter is further included, wherein the inner ring is inserted into the catheter, and a protrusion is provided on the inner ring, and the protrusion expands the diameter of the inlet of the catheter to form a sealed connection.

[0014] In some embodiments, the conduit extends between the connector body and the inner ring, the nut is sleeved on the conduit and threadedly connected to the connector body, and the nut and the protrusion of the inner ring tightly clamp the conduit into a sealed connection.

[0015] Compared with the prior art, the present invention has the following beneficial effects: First, the plug portion is provided with an inclination angle θ, and θ is greater than the angle α at which the slot portion undergoes elastic deformation during insertion, which not only ensures the sealing effect between the plug portion and the slot portion, but also makes it easier for the plug portion to be positioned in the slot portion for insertion. It also reduces the frictional resistance that the inner ring restriction surface needs to overcome when the plug portion and the slot portion are combined. The frictional resistance gradually changes from small to large, and the contact surface is not easily damaged, thereby extending the service life of the connector body and the inner ring. The overall frictional resistance between the plug portion and the slot portion is small, and only a small torque is required to tighten the nut.

[0016] Second, since the cross-section of the inner ring plug part is conical, the plug part has the largest stroke and the smallest compression at the front end when inserted, and the largest compression and the smallest stroke when inserted at the rear end when inserted. During disassembly, the rear end with the largest compression is first separated from the slot part. Thus, while keeping the inner ring and the catheter connected, the inner ring can be detached from the connector body with relatively small force, reducing damage to the inner ring during each assembly and disassembly process, thereby increasing the service life of the inner ring during multiple assembly and disassembly, and making each assembly and disassembly relatively labor-saving, so that the catheter and the connector can be re-engaged more labor-saving, reliably and easily. When re-engaged, the compression rate of the inner ring will not decrease, which can ensure the reliability and durability of the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of the plug part and the slot part in the prior art;

[0018] Figure 2 This is a schematic structural diagram of a resin-made sealed conduit joint shown in the present invention;

[0019] Figure 3 for Figure 2 Enlarged view of the part marked A;

[0020] Figure 4 for Figure 3 A schematic structural diagram of the plug portion and the slot portion shown in FIG;

[0021] Explanation of the reference numerals: connector body 1, inner ring 2, nut 3, conduit 4, plug portion 21, slot portion 10, first sealing portion 51, second sealing portion 52, third sealing portion 53, inner circumferential surface 210, outer circumferential surface 212, outer circumferential surface 100, inner circumferential surface 101, compression portion 211, protrusion 22, cylinder portion 11, outer cylinder portion 12, inner cylinder portion 13. DETAILED DESCRIPTION

[0022] The present invention is described in detail below with reference to the various embodiments shown in the accompanying drawings. However, it should be noted that these embodiments are not limitations of the present invention, and any equivalent transformations or substitutions in functions, methods, or structures made by ordinary technicians in this field based on these embodiments are all within the scope of protection of the present invention.

[0023] like Figure 2-4 The resin sealed conduit joint shown comprises a joint body 1, an inner ring 2, and a nut 3. The joint body 1 and the inner ring 2 are made of resin material and can be deformed.

[0024] The inner ring 2 is formed with a plug portion 21 , and the joint body 1 is formed with a slot portion 10 . The plug portion 21 is inserted into the slot portion 10 to form a sealed connection, which serves as a first sealing portion 51 .

[0025] In the free state, the thickness of the plug portion 21 linearly changes along the axial direction of the inner ring 2. In the plugged state, the slot portion 10 undergoes elastic deformation, and the rate of change of the slot portion 10 is less than the rate of change of the plug portion 21 in the free state. Specifically, in this embodiment, in the free state (i.e., when the plug portion 21 and the slot portion 10 are not plugged in), the inner circumferential surface 210 of the plug portion 21 forms an angle θ with the axis of the inner ring 2, where 0 < θ < 15°. In this embodiment, θ = 15°. The plug portion 21 is provided with an inclination angle θ to facilitate its positioning in the slot portion 10 for insertion, thereby forming a surface seal when the plug portion 21 is inserted into the slot portion 10.

[0026] Since the plug portion 21 is provided with an inclination angle θ, the frictional resistance that the inner ring limiting surface needs to overcome when the plug portion and the slot portion are combined is reduced, the frictional resistance gradually changes from small to large, the contact surface is not easily damaged, the sealing effect between the joint body 1 and the inner ring 2 is more durable, and the service life of the joint body 1 and the inner ring 2 can be extended. In addition, only a small torque needs to be applied to tighten the nut, saving time and effort.

[0027] In the plugged state, the plug portion 21 is compressed. Figure 2The compressed portion 211 in the inner ring 2 is compressed more deeply as the plug portion 21 is pressed deeper. Simultaneously, the slot portion 10 undergoes elastic deformation, and the outer circumference 100 of the slot portion 10 forms an angle α with the axis of the inner ring 2. This angle θ is greater than the angle α, thereby ensuring a sealing effect between the plug portion 21 and the slot portion 10.

[0028] T2>T1≥D, where D is the width of the slot portion 10, T1 is the thickness of the plug portion 21 at the front end of insertion, and T2 is the thickness of the plug portion 21 at the rear end of insertion. When plugged in, the compression rate of the plug portion 21 gradually decreases along the insertion direction. The compression rate of the plug portion 21 at the front end of insertion is greater than or equal to 0, and the compression rate of the plug portion 21 at the rear end of insertion is less than or equal to 40%.

[0029] In the free state, the outer circumferential surface 212 of the plug portion 21 forms a certain angle with the axis of the inner ring 1, and the angle is greater than or equal to 0. In the plugged state, the outer circumferential surface 212 of the plug portion 21 abuts the inner circumferential surface 101 of the slot portion 10, the outer circumferential surface 212 of the plug portion 21 is squeezed, the slot portion 10 undergoes elastic deformation, and the inner circumferential surface 101 of the slot portion 10 forms a certain angle with the axis of the inner ring 2.

[0030] When the plug part 21 is inserted into the front end, the stroke is the largest and the compression is the smallest. When the plug part 21 is inserted into the rear end, the compression is the largest and the stroke is the smallest. During disassembly, the rear end with the largest compression is first separated from the slot part 10. Thus, while keeping the inner ring 2 and the conduit 4 connected, the inner ring 2 can be detached from the connector body 1 with a relatively small force, reducing the damage to the inner ring 2 during each assembly and disassembly process, thereby increasing the service life of the inner ring 2 during multiple assembly and disassembly, and making each assembly and disassembly relatively labor-saving, so that the conduit 4 and the connector can be re-engaged more labor-saving, reliably and easily. When re-engaged, since the inner ring 2 and the connector body 1 are not worn, the compression rate of the inner ring 2 will not decrease, thereby ensuring the reliability and durability of the seal.

[0031] During assembly and disassembly, the inner ring 2 and the catheter 4 remain attached, and the catheter 4 does not deform, thereby ensuring the sealing effect of the second seal 52 and the third seal 53 during re-engagement. Therefore, both during the initial joining of the resin-made sealed catheter joint and the catheter and during re-engagement, a good seal between the joint body 1 and the inner ring 2 is ensured.

[0032] The joint body 1 includes a cylindrical portion 11, with an outer cylindrical portion 12 and an inner cylindrical portion 13 extending axially outwardly formed on one side of the cylindrical portion 11. The inner cylindrical portion 13 and the outer cylindrical portion 12 are arranged inside and outside in the longitudinal direction. The outer cylindrical portion 12 extends longer than the inner cylindrical portion 13. The slot portion 10 is formed by the cylindrical portion 11, the outer cylindrical portion 12, and the inner cylindrical portion 13.

[0033] The joint also includes a conduit 4, into which the inner ring 2 is inserted. The inner ring 2 is provided with a protrusion 22, which expands the diameter of the conduit 4 at its inlet to form a sealed connection, serving as a second seal 52. The conduit 4 extends between the joint body 1 and the inner ring 2. The nut 3 and the protrusion 22 of the inner ring 2 tightly clamp the conduit 4, creating a sealed connection, serving as a third seal 53.

[0034] The nut 3 is mounted on the conduit 4 and threadedly connected to the connector body 1. Specifically, the nut 3 is fastened to the outer tube portion 12 of the connector body 1 via internal threads and, together with the inner ring 2, secures the conduit 4 in the connector body 1. The nut 3 is connected to the connector body 1 to maintain the plug portion 21 and the socket portion 10 in the plugged state, and the nut 3 is in a compressed state against the inner ring 2.

[0035] Since the friction resistance that the inner ring 2 limiting surface needs to overcome when the plug portion 21 and the slot portion 10 are combined is small, the nut 3 only needs to apply a small torque to form a sealing portion that applies appropriate surface pressure between the interconnected joint body 1 and the inner ring 2, and apply a sealing force radially through the sealing portion to make the plug portion 21 and the slot portion 10 fit tightly, thereby ensuring excellent sealing between the joint body 1 and the inner ring 2 and ensuring the sealing effect of the first sealing point 51.

[0036] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

[0037] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A resin sealed conduit joint, characterized in that: The joint comprises a connector body, an inner ring, and a nut; the inner ring is formed with a plug portion, the connector body is formed with a slot portion, the plug portion is inserted into the slot portion to form a sealed connection, the nut is connected to the connector body to maintain the plug-in state of the plug portion and the slot portion, and the nut is in a pressing state against the inner ring; In the free state, the thickness of the plug portion changes linearly along the axial direction of the inner ring. In the plugged state, the slot portion undergoes elastic deformation, and the diameter change rate of the slot portion is smaller than the diameter change rate of the plug portion in the free state.

2. The resin sealed conduit joint according to claim 1, characterized in that: In the free state, the inner circumference of the plug portion and the inner ring axis form an angle θ. In the plugged state, the slot portion undergoes elastic deformation, and the outer circumference of the slot portion and the inner ring axis form an angle α, and the angle θ is greater than the angle α.

3. A resin sealed conduit joint according to claim 1 or 2, characterized in that: 0<θ<15°.

4. The resin sealed conduit joint according to claim 3, characterized in that: T2>T1≥D, D is the width of the slot, T1 is the thickness of the plug at the front end, and T2 is the thickness of the plug at the rear end.

5. The resin sealed conduit joint according to claim 4, characterized in that: In the plugged state, the compression rate of the plug portion decreases gradually along the insertion direction. The compression rate of the plug portion at the front end is greater than or equal to 0, and the compression rate of the plug portion at the rear end is less than or equal to 40%.

6. The resin sealed conduit joint according to claim 5, characterized in that: In the free state, the outer peripheral surface of the plug portion and the axis of the inner ring form a certain angle.

7. The resin sealed conduit joint according to claim 1, characterized in that: The joint body includes a cylindrical portion, one side of which is formed with an outer cylindrical portion and an inner cylindrical portion extending axially outward, the extension length of the outer cylindrical portion is greater than the extension length of the inner cylindrical portion, and the slot portion is formed by the cylindrical portion, the outer cylindrical portion and the inner cylindrical portion.

8. The resin sealed conduit joint according to claim 1, characterized in that: The device also includes a catheter, the inner ring is inserted into the catheter, and a protrusion is provided on the inner ring. The protrusion expands the diameter of the inlet of the catheter to form a sealed connection.

9. The resin sealed conduit joint according to claim 8, characterized in that: The conduit extends between the joint body and the inner ring. The nut is sleeved on the conduit and threadedly connected to the joint body. The nut and the protrusion of the inner ring tightly clamp the conduit to form a sealed connection.

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