A shockproof bead entry joint with optimized sealing effect

Abstract

The utility model discloses a kind of shockproof type bead entry joints of good sealing effect optimization, including joint body, bead entry head and nut, one end of bead entry head is connected with PFA pipe fitting bead entry head and PFA pipe fitting interference fit, interference fit generates radial contact stress, forms primary seal;Nut and joint body thread cooperation, when joint body connects good PFA pipe fitting, then lock nut, PFA pipe fitting tube wall is formed with the groove matching the profile of bead entry head under lock pressure, so that PFA pipe fitting and joint body are closely connected, eliminate microscopic gap.The utility model is by joint body, bead entry head and nut three constitute core element, three are by high purity PFA injection molding, size precision is high, surface finish is good, long-term withstand-80 ℃~260 ℃ temperature fluctuation, high temperature under anti-creep property is better than PTFE, thermal deformation rate is low, ultra-low release pollution.

Description

Technical Field

[0001] This utility model belongs to the field of PFA connector technology, and in particular relates to a vibration-proof bead inserter with optimized sealing effect. Background Technology

[0002] In fields such as chemical engineering, semiconductors, and biomedicine, high-purity fluid transport systems place extremely stringent requirements on the sealing performance, corrosion resistance, and cleanliness of pipe fittings. While traditional polytetrafluoroethylene (PTFE) fittings possess excellent chemical stability, their high hardness and poor elasticity make them prone to seal failure when relying on conventional sealing methods such as rubber sealing rings or flange compression. After long-term use, axial leakage or radial micro-leakage may occur.

[0003] Existing ball-type connectors mostly use metal balls or ordinary PFA material, which have the following drawbacks: metal balls are prone to releasing ions that contaminate high-purity media, failing to meet the cleanliness standards of the semiconductor industry; ordinary PFA connectors may cause the sealing gap to widen under high-temperature conditions (>200℃) due to their large coefficient of thermal expansion, requiring frequent maintenance. Furthermore, traditional structures lack multi-layer sealing redundancy design, resulting in a high risk of single-point failure and making it difficult to meet the needs of high-pressure vibration scenarios in chemical pipelines. To address these issues, a vibration-resistant ball-type connector with optimized sealing performance is proposed. Utility Model Content

[0004] The purpose of this invention is to provide a vibration-resistant bead connector with optimized sealing performance, thereby solving the problems mentioned in the background document.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: This utility model is a vibration-resistant bead-insertion connector with optimized sealing effect, including a connector body, a bead-insertion head, and a nut. The connector body contains a PFA pipe fitting. The bead-insertion head and the PFA pipe fitting are interference-fitted, and the interference fit generates radial contact stress, forming a primary seal. The nut is threadedly fitted to the connector body. After the connector body is connected to the PFA pipe fitting, the nut is tightened. Under the tightening pressure, the wall of the PFA pipe fitting forms a groove that matches the contour of the bead-insertion head, so that the PFA pipe fitting and the connector body are tightly connected, eliminating microscopic gaps.

[0006] Preferably, a hexagonal nut is fixedly connected to the peripheral side of the connector body, and two limiting blocks are fixedly connected to both the front and rear sides of the hexagonal nut. An elastic buckle is snapped into the peripheral side of the connector body, and two limiting grooves are opened on the peripheral side of the inner wall of the elastic buckle. Two clamping plates are fixedly connected to one surface of the elastic buckle. Several clamping grooves are provided on the peripheral side of the nut. After the PFA pipe fitting is connected to the connector body and the nut is tightened, the elastic buckle is installed on the connector body, the limiting blocks are inserted into the limiting grooves, the clamping plates are pried open to both sides, and then the clamping plates are inserted into the clamping grooves to limit the nut.

[0007] Preferably, an annular groove is formed on the circumferential side of the inner wall of the connector body, and an expansion body, a mounting ring and a liquid bag are fixedly arranged in the annular groove. A plurality of slots are formed on the circumferential side of the mounting ring, and a needle is provided in the slot. A damping ring is provided on the circumferential side of the needle. The liquid bag is filled with perfluoropolyether liquid.

[0008] Preferably, one end of the PFA fitting is flared.

[0009] Preferably, the limiting block and the limiting groove are inserted into each other, and the card plate and the card slot are inserted into each other.

[0010] Preferably, the mounting ring is located between the liquid bag and the expansion body, and the expansion body is fixedly mounted on the top surface of the inner wall of the annular groove.

[0011] Preferably, the liquid bag is made of aluminum foil composite film, and the expander is made of polylactic acid-polyethylene glycol copolymer.

[0012] This utility model has the following beneficial effects: This utility model consists of three core elements: the connector body, the bead inserter, and the nut. All three are injection molded from high-purity PFA, which has high dimensional accuracy, good surface finish, long-term resistance to temperature fluctuations from -80℃ to 260℃, better creep resistance than PTFE at high temperatures, low heat deformation rate, ultra-low precipitation pollution, and metal ion precipitation meets the SEMI F57 test, satisfying the requirements for semiconductor ultrapure fluid transmission. After the nut is fixed, the card plate is inserted into the slot on the side of the nut. The elastic buckle limits the nut and eliminates the possibility of the nut loosening due to vibration or other factors during use. The multi-level sealing mechanism improves the connection sealing performance. This invention incorporates an expansion body, a needle, and a liquid bag. When the temperature is high, the expansion body expands, pushing the needle downwards. The needle punctures the liquid bag, allowing the heat-compensating liquid inside to flow out and enter the connector body. This fills the connection between the connector body and the PFA fitting, preventing the PFA from deforming due to high temperatures and creating gaps that could compromise the seal.

[0013] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the rear structure of this utility model; Figure 3 This is a schematic diagram of the exploded structure of this utility model; Figure 4 This is a schematic diagram of the internal structure of the present invention; Figure 5 This is a cross-sectional structural diagram of the connector of this utility model; Figure 6 for Figure 4 A magnified schematic diagram of the local structure at point A.

[0016] The components represented by each number in the attached diagram are as follows: 1. Connector body; 2. Insert bead head; 3. Nut; 4. Elastic snap fastener; 5. PFA fitting; 6. Clamping plate; 7. Clamping groove; 8. Limiting block; 9. Limiting groove; 10. Liquid bag; 11. Expansion body; 12. Mounting ring; 13. Needle; 14. Damping ring. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0018] In the description of this utility model, it should be understood that the terms "upper", "middle", "outer", "inner", etc., which indicate orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0019] Please see Figures 1-6As shown, this utility model is a vibration-resistant bead-insertion connector with optimized sealing effect, including a connector body 1, a bead-insertion head 2, and a nut 3. The connector body 1 is provided with a PFA fitting 5. One end of the PFA fitting 5 is flared. The end of the PFA fitting 5 to be connected is baked at 250°C to soften it. After flaring, it is flared using a flaring jig. The shape of the flared end is the same as the shape of the bead-insertion head 2. The rear end is tapered. After the connector body 1 is connected to the PFA fitting 5, the nut 3 is tightened. Under the locking pressure, the wall of the PFA fitting 5 forms a groove that matches the contour of the bead-insertion head 2, so that the PFA fitting 5 and the connector body 1 are tightly connected, eliminating micro gaps. One end of the PFA fitting 5 is installed in the connector body 1. The diameter of the bead-insertion head 2 is larger than the inner diameter of the PFA fitting 5. The bead-insertion head 2 and the PFA fitting 5 are interference-fitted. The interference fit generates radial contact stress, forming a primary seal. The nut 3 is threaded into the connector body 1. The front end of the connector body 1 is used to connect the PFA fitting 5 and has an external thread at the rear end. The nut 3 has an internal thread. After the connector body 1 is connected to the PFA fitting 5, the nut 3 is tightened. Under the locking pressure, the wall of the PFA fitting 5 forms a groove that matches the contour of the bead insert 2, so that the PFA fitting 5 and the connector body 1 are tightly connected, eliminating micro gaps and preventing the internal solution from overflowing.

[0020] A hexagonal nut is fixedly connected to the periphery of the connector body 1. Two limiting blocks 8 are fixedly connected to both the front and rear sides of the hexagonal nut. An elastic buckle 4 is snapped into the periphery of the connector body 1. Two limiting grooves 9 are opened on the periphery of the inner wall of the elastic buckle 4. The limiting blocks 8 and the limiting grooves 9 are inserted into each other. Two locking plates 6 are fixedly connected to one surface of the elastic buckle 4. Several locking grooves 7 are provided on the periphery of the nut 3. When the connector body 1 is connected to the PFA fitting 5 and the nut 3 is tightened, the elastic buckle 4 is installed on the connector body 1, the limiting blocks 8 are inserted into the limiting grooves 9, the locking plates 6 are pried open to both sides, the locking plates 6 are inserted into the locking grooves 7, and then the locking plates 6 are inserted into the locking grooves 7 to limit the nut 3.

[0021] An annular groove is formed on the circumferential side of the inner wall of the connector body 1. An expansion body 11, a mounting ring 12, and a liquid bag 10 are fixed in the annular groove. Several slots are formed on the circumferential side of the mounting ring 12. The mounting ring 12 is located between the liquid bag 10 and the expansion body 11. The liquid bag 10 is made of aluminum foil composite film with a temperature resistance of ≥200℃ and is fixed in the annular groove by an annular clamp. The expansion body 11 is made of polylactic acid-polyethylene glycol copolymer. Polylactic acid (PLA, glass transition temperature Tg≈60℃); additives: polyethylene glycol (PEG, Tg≈-60℃) and nano-silica (SiO2, to enhance temperature resistance); formula: PLA 70% + PEG 20%. +10% SiO2 (mass fraction); Characteristics: Hard and brittle at room temperature (expansion rate <5%), softens at 260℃, PLA molecular chains expand, and the overall expansion rate can reach 50%-80% (phase transition temperature determined by DSC test). The expansion body 11 is fixedly installed on the top surface of the inner wall of the annular groove. The expansion body 11 is bonded to the annulus with high-temperature resistant epoxy adhesive (temperature resistance ≥300℃). The groove hole is provided with a needle 13, and the peripheral side of the needle 13 is provided with a damping ring 14. The damping ring 14 provides a certain resistance to the sliding of the needle 13, preventing the needle 13 from being too loose and falling off at will. The liquid bag 10 is filled with perfluoropolyether liquid, and the liquid filling amount is 80% of the internal volume of the liquid bag 10 (to reserve expansion space to avoid the bag body expanding and breaking at high temperature). The perfluoropolyether liquid has a boiling point ≥260℃, good compatibility with PFA, and viscosity ≤100mPa·s at high temperature. It flows easily to fill the gap. When the temperature exceeds 260℃, the PFA fitting 5 deforms, and the liquid flows out from the liquid bag 10. It fills the gap caused by deformation between the connector body 1 and the PFA fitting 5, thereby avoiding damage to the sealing due to excessive temperature.

[0022] Working principle: The end of the PFA fitting 5 to be connected is baked at 250°C to soften it. After softening, it is flared using a flaring tool. The flared PFA fitting 5 is then connected to the front end of the bead insert 2. After connection, the rear end of the bead insert 2 is combined with the connector body 1. Because the diameter of the bead ring of the bead insert 2 is larger than the inner diameter of the PFA pipe 5, the interference fit generates radial contact stress, forming a primary seal. After connection, the rear end of the bead insert 2 is combined with the connector body 1 until the bead ring contacts the conical sealing surface. After combination, the fitting to be connected is passed through the nut 3. The nut 3 is threaded onto the connector body 1. Under the locking pressure, the wall of the PFA fitting 5 forms a groove matching the contour of the bead ring of the bead insert 2, ensuring a tight connection between the PFA fitting 5 and the connector body 1, eliminating... Microscopic gaps prevent internal solution from overflowing. After the connector body 1 and nut 3 are locked and positioned, an elastic buckle 4 is placed between them. The limiting block 8 on the connector body 1 is inserted into the limiting groove 9 of the elastic buckle 4. Then, the clamping plate 6 is inserted into the groove of the nut 3 to further fix the nut 3 and eliminate the possibility of the nut 3 loosening due to vibration or other factors during use. When the ambient temperature of the equipment exceeds 260℃, the PFA fitting 5 will deform and create a gap with the inner wall of the connector body 1. The expansion body 11 will expand and push the piercing needle 13 to move. The piercing needle 13 will puncture the liquid bag 10, causing the perfluoropolyether liquid inside to drip out and fill the gap, thus preventing damage to the equipment's seal.

[0023] Furthermore, a snap-fit ​​is added between the connector body and the nut. After the connector body and the nut are locked in place, the snap-fit ​​is inserted between them. The snap-fit ​​is tightly fitted and fixed to the connector body by the protrusion. Due to the gap between the teeth on the outside of the nut, the snap-fit ​​is inserted between the teeth of the nut to further fix the nut and eliminate the possibility of the nut loosening due to vibration or other factors during use. The multi-stage sealing mechanism improves the connection sealing performance.

[0024] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0025] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A vibration-damping bead inserter with optimized sealing performance, comprising a insert body (1), a bead insert head (2), and a nut (3), characterized in that: The connector body (1) is provided with a PFA fitting (5), and the ball inlet (2) is press-fitted with the PFA fitting (5). The press-fit generates radial contact stress, forming a primary seal. The nut (3) is threadedly engaged with the connector body (1). After the connector body (1) is connected to the PFA fitting (5), the nut (3) is tightened. Under the locking pressure, the wall of the PFA fitting (5) forms a groove that matches the profile of the bead insert (2), so that the PFA fitting (5) and the connector body (1) are tightly connected, eliminating micro gaps.

2. The vibration-resistant bead connector with optimized sealing effect according to claim 1, characterized in that, A hexagonal nut is fixedly connected to the peripheral side of the connector body (1). Two limiting blocks (8) are fixedly connected to the front and rear sides of the hexagonal nut. An elastic buckle (4) is snapped into the peripheral side of the connector body (1). Two limiting grooves (9) are opened on the peripheral side of the inner wall of the elastic buckle (4). Two locking plates (6) are fixedly connected to one surface of the elastic buckle (4). Several locking grooves (7) are provided on the peripheral side of the nut (3). After the connector body (1) is connected to the PFA fitting (5) and the nut (3) is tightened, the elastic buckle (4) is installed on the connector body (1), the limiting block (8) is inserted into the limiting groove (9), the card plate (6) is pried open to both sides, and then the card plate (6) is inserted into the card groove (7) to limit the nut (3).

3. The vibration-resistant bead connector with optimized sealing effect according to claim 1, characterized in that, The inner wall of the connector body (1) is provided with an annular groove. An expansion body (11), a mounting ring (12) and a liquid bag (10) are fixedly provided in the annular groove. The mounting ring (12) is provided with a plurality of slots on its circumferential side. A needle (13) is provided in the slot. A damping ring (14) is provided on the circumferential side of the needle (13). The liquid bag (10) is filled with perfluoropolyether liquid.

4. The vibration-resistant bead connector with optimized sealing effect according to claim 1, characterized in that, One end of the PFA fitting (5) is flared.

5. The vibration-resistant bead connector with optimized sealing effect according to claim 2, characterized in that, The limiting block (8) is inserted into the limiting groove (9), and the card plate (6) is inserted into the card slot (7).

6. The vibration-resistant bead connector with optimized sealing effect according to claim 3, characterized in that, The mounting ring (12) is located between the liquid bag (10) and the expansion body (11), which is fixedly installed on the top surface of the inner wall of the annular groove.

7. The vibration-resistant bead connector with optimized sealing effect according to claim 3, characterized in that, The liquid bag (10) is made of aluminum foil composite film, and the expander (11) is made of polylactic acid-polyethylene glycol copolymer.

Images