A pipe fitting

Abstract

This invention provides a pipe fitting, belonging to the field of pipeline technology. It solves the problem of poor sealing performance of existing pipe fittings. This pipe fitting includes a pipe body, with an internally threaded insert and a rubber gasket abutting against the inner end of the insert at one end. The rubber gasket is approximately annular, and its minimum inner diameter is smaller than that of the internally threaded insert. The rubber gasket has radially outwardly inclined protrusions, and the internally threaded insert has a mating notch for the inclined protrusions to abut against, forming a seal. After the inclined protrusions and the mating notch engage, even when exposed to heat or external force, the rubber gasket and the internally threaded insert remain tightly abutted together, ensuring a good seal between them while preventing slippage.

Description

Technical Field

[0001] This invention belongs to the field of pipeline technology, and particularly relates to a pipe fitting. Background Technology

[0002] Due to the excellent properties of plastic materials, plastic pipes are widely used in engineering and home decoration piping. To connect plastic pipes with metal fittings such as faucets and angle valves, plastic pipe fittings with metal inserts, or plastic pipe joints, have become an indispensable component in plastic piping systems.

[0003] For example, a plastic pipe connector for a water treatment nuclear power plant, patent number CN201921163930, includes a connector pipe body, which is a hollow tubular structure. A first connecting pipe is integrally injection molded and connected to the outer ring on the left side of the connector pipe body, and a second connecting pipe is integrally injection molded and connected to the inner ring on the right side of the connector pipe body. A metal internal threaded cylinder is installed inside the connector pipe body, and a metal external threaded cylinder is provided on the outer side of the second connecting pipe. An inner ring is integrally injection molded and connected to the inner wall on the left side of the first connecting pipe, and an outer ring is integrally injection molded and connected to the outer wall on the right side of the first connecting pipe. Sealing rings are provided between the metal internal threaded cylinder and the metal external threaded cylinder and the connector pipe body. Protrusions are circumferentially distributed at equal intervals on the outer wall of the metal internal threaded cylinder and the inner wall of the metal external threaded cylinder.

[0004] However, the aforementioned plastic pipe joint for water treatment nuclear power plants has the following shortcomings: Although a sealing ring abuts between one end of the metal internal threaded cylinder and the main body of the connecting pipe in the aforementioned plastic pipe joint for water treatment nuclear power plants, due to the different expansion coefficients of the plastic material and the metal internal threaded cylinder during the transportation of hot water in the pipeline, specifically, the expansion coefficient of the plastic material after heating is greater than that of the metal internal threaded cylinder after heating. Therefore, under the action of external force and the influence of thermal expansion and contraction, gaps will appear between the main body of the connecting pipe made of plastic material, the sealing ring, and the metal internal threaded cylinder. In fact, the sealing ring and the metal internal threaded cylinder may even slip off, causing the liquid medium in the pipeline to flow out of the pipe body through the gaps, resulting in water leakage. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in the prior art by proposing a pipe fitting that solves the problem of poor sealing performance in existing pipe fittings.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A pipe fitting includes a pipe body, one end of which is embedded with an internally threaded insert and a rubber gasket abutting against the inner end of the internally threaded insert. The rubber gasket is generally annular, and the minimum inner diameter of the rubber gasket is smaller than the minimum inner diameter of the internally threaded insert. The rubber gasket is characterized by having an inclined protrusion that slopes outward in a radial direction, and the internally threaded insert is characterized by having a mating notch for the inclined protrusion to abut against and form a seal.

[0008] This pipe fitting uses a rubber gasket that abuts against an internally threaded insert. The inclined protrusion on the rubber gasket inserts into the mating notch of the internally threaded insert and abuts against the inner wall of the notch, thus securing the rubber gasket and the internally threaded insert. The fitting is then formed by injection molding. Specifically, because the inclined protrusion on the rubber gasket is radially outward, when it inserts into the mating notch and abuts against its inner wall, the rubber gasket can engage with the internally threaded insert, creating axial fixation between them. Furthermore, since the minimum inner diameter of the rubber gasket is smaller than the minimum inner diameter of the internally threaded insert, when using this pipe fitting, by screwing another externally threaded pipe fitting into the internally threaded insert and continuously screwing it into the fitting, one end of the externally threaded pipe fitting is connected to the rubber gasket. This ensures a seal at the threaded end when the fitting is connected to other pipe fittings, preventing leakage. Because the rubber gasket and the internal thread insert in this pipe fitting are engaged by an inclined protrusion and a mating notch, the rubber gasket and the internal thread insert can still be tightly pressed together even after being exposed to heat or external force. This ensures the sealing between the internal thread insert and the rubber gasket while preventing the rubber gasket and the internal thread insert from slipping off.

[0009] Meanwhile, when one end of another pipe fitting abuts against the rubber gasket and a squeezing force is applied to the rubber gasket, the inclined protrusion on the rubber gasket will generate an upward rebound force, which makes the inclined protrusion fit more tightly against the inner wall of the mating notch, thereby further improving the sealing strength of this pipe fitting after being connected with other pipe fittings.

[0010] In one of the aforementioned pipe fittings, the inclined protrusion is approximately annular.

[0011] Since the inclined protrusion is roughly annular, the mating notch is also an annular notch that matches the inclined protrusion. Therefore, the annular inclined protrusion and the annular mating notch abut and engage, thereby further improving the installation fit strength between the internal thread metal insert and the sealing gasket, and further improving the sealing performance.

[0012] In one of the aforementioned pipe fittings, the rubber gasket has an annular groove, and the internal thread insert has a snap-fit ​​part that engages with the annular groove.

[0013] The snap-fit ​​part on the internal thread insert engages with the annular groove, which, together with the inclined protrusion and the mating notch, forms a double snap-fit ​​between the internal thread insert and the rubber gasket. This further strengthens the axial connection between the internal thread insert and the rubber gasket, thereby preventing slippage between the rubber gasket and the internal thread insert.

[0014] In one of the above-mentioned pipe fittings, the side wall of the annular groove near the central axis of the rubber gasket is connected to the side wall of the inclined protrusion away from the central axis of the rubber gasket, and the side wall of the annular groove near the central axis of the rubber gasket and the side wall of the inclined protrusion away from the central axis of the rubber gasket are at the same inclination angle.

[0015] Because the side wall of the annular groove closest to the central axis of the rubber gasket is connected to the side wall of the inclined protrusion furthest from the central axis of the rubber gasket, and the side wall of the annular groove closest to the central axis of the rubber gasket and the side wall of the inclined protrusion furthest from the central axis of the rubber gasket are at the same inclination angle, when the snap-fit ​​part is engaged in the annular groove and the inclined protrusion is engaged in the mating notch at the same time, the side wall of the annular groove closest to the central axis of the rubber gasket and the side wall of the inclined protrusion furthest from the central axis of the rubber gasket can form a seal at the same time, and they belong to the same sealing contact surface. This improves the fixing strength between the internal thread insert and the rubber gasket, and also increases the contact area of ​​the sealing contact, thereby improving the sealing performance between the internal thread insert and the sealing gasket.

[0016] In one of the aforementioned pipe fittings, a retaining ring is provided on the outer circumferential surface of the internal thread insert, and the thickness of the retaining ring gradually increases along the central axis of the internal thread insert in a direction away from the central axis of the internal thread insert.

[0017] Since the thickness of the retaining ring gradually increases along the central axis of the internal thread insert away from the central axis, the portion of the retaining ring further away from the central axis of the internal thread insert is thicker. Furthermore, the retaining ring is roughly trapezoidal in shape when viewed from the radial section of the internal thread insert. Therefore, after the internal thread insert and the rubber gasket are snapped together and fixed, when the pipe body is injection molded outside the internal thread insert and the rubber gasket, the setting of the retaining ring can strengthen the fixed connection strength between the internal thread insert and the pipe body.

[0018] In one of the aforementioned pipe fittings, there are at least two retaining rings, which are evenly distributed along the central axis of the internal thread insert.

[0019] Specifically, there are multiple retaining rings, more specifically three (one at each end of the internal thread insert, and the other between the two ends of the internal thread insert). Since the retaining rings are evenly distributed along the central axis of the internal thread insert, the fixed connection between the tube body and the internal thread insert is more stable after the tube body is injection molded outside the internal thread insert.

[0020] In the aforementioned pipe fitting, a fixed edge is provided on the outer edge of the rubber gasket, a fixed ring abuts against the rubber gasket, and the outer circumferential surface of the fixed ring abuts against the side wall of the fixed edge facing the central axis of the rubber gasket.

[0021] Specifically, the fixing ring at one end of the internal thread insert abuts against the rubber gasket and the fixing edge on the outer edge of the rubber gasket abuts against the side wall of the internal thread insert, thereby making the radial fixation between the internal thread insert and the rubber gasket more secure, making the rubber gasket less likely to slip off, and increasing the contact area between the rubber gasket and the internal thread insert, thus improving the stability of the fixed connection between the two and the sealing strength between them.

[0022] In the aforementioned pipe fitting, fixing blocks are distributed circumferentially on the outer circumferential surface of the fixing ring, and the thickness of the fixing blocks along the central axis of the internal thread insert and along the circumferential direction of the internal thread insert both gradually increase in the direction away from the central axis of the internal thread insert.

[0023] Since the fixing blocks distributed circumferentially on the outer circumferential surface of the fixing ring gradually thicken in the direction away from the central axis of the internal thread insert, the fixing blocks can further enhance the fixing connection strength between the tube body and the internal thread insert after the tube body is injection molded outside the internal thread insert.

[0024] In one of the aforementioned pipe fittings, a limiting groove is provided on the fixed edge, and a fixing block on the fixing ring abuts against the groove wall of the limiting groove to form circumferential positioning.

[0025] After the inclined protrusion engages with the notch and the snap-fit ​​part engages with the annular groove to form a snap-fit ​​fixation between the internal thread insert and the rubber gasket, the fixing block on the fixing ring located at one end of the internal thread insert abuts against the rubber gasket can be inserted into the limiting groove. The fixing block also abuts against the two side walls of the limiting groove, thereby fixing the internal thread insert and the rubber gasket circumferentially. This prevents the rubber gasket from rotating relative to the internal thread insert when the pipe fitting is used, thus achieving an anti-rotation function and further strengthening the fixed connection between the rubber gasket and the internal thread insert.

[0026] In one of the above-mentioned pipe fittings, the rubber gasket has a water passage hole, and the inner cavity of the internally threaded insert is connected to the inner cavity of the pipe body through the water passage hole.

[0027] Specifically, during use, the liquid medium flows through the inner cavity of the internal thread insert into the water passage and then into the flow channel of the pipe body.

[0028] Compared with existing technologies, this pipe fitting has the following advantages:

[0029] 1. After the inclined protrusion and the mating notch are engaged, the rubber gasket and the internal thread insert of this pipe joint can still be tightly abutted together even when exposed to heat or external force, which ensures the sealing between the internal thread insert and the rubber gasket and prevents the rubber gasket and the internal thread insert from slipping off.

[0030] 2. When one end of another pipe fitting is pressed against the rubber gasket and a squeezing force is applied to the rubber gasket, the inclined protrusion on the rubber gasket will generate an upward rebound force, which will make the inclined protrusion fit more tightly against the inner wall of the mating notch, thereby further improving the sealing strength of this pipe fitting after being connected with other pipe fittings.

[0031] 3. By abutting against the walls of the limiting groove on both sides of the fixing block, the internal thread insert and the rubber gasket are circumferentially fixed, thereby preventing the rubber gasket from rotating relative to the internal thread insert when this pipe fitting is used, thus achieving an anti-rotation function and further strengthening the fixed connection between the rubber gasket and the internal thread insert. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the pipe fitting structure;

[0033] Figure 2 This is a sectional view of the pipe fitting;

[0034] Figure 3 yes Figure 2 Enlarged view of part A in the middle;

[0035] Figure 4 This is a schematic diagram of the structure of the internal thread insert and the rubber gasket in this pipe fitting.

[0036] Figure 5 This is a cross-sectional view of the internal thread insert and the rubber gasket in this pipe fitting.

[0037] Figure 6 This is a schematic diagram of the internal thread insert in this pipe fitting;

[0038] Figure 7 This is a schematic diagram of the structure of the rubber gasket in this pipe fitting.

[0039] In the figure, 1 is the pipe body; 2 is the internal thread insert; 2a is the mating notch; 2b is the snap-fit ​​part; 2c is the retaining ring; 2c1 is the retaining block; 3 is the rubber gasket; 3a is the inclined protrusion; 3b is the annular groove; 3c is the retaining edge; 3c1 is the limiting groove; and 3d is the water passage hole. Detailed Implementation

[0040] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0041] Example 1

[0042] like Figures 1 to 7As shown, a pipe fitting includes a pipe body 1. An internally threaded insert 2 is embedded at one end of the pipe body 1. The internally threaded insert 2 extends into the pipe body 1, and a rubber gasket 3 abuts against the inner end of the pipe body 1. The rubber gasket 3 is approximately annular and has a water passage hole. During manufacturing, the rubber gasket 3 abuts against the internally threaded insert 2, and the inclined protrusion 3a on the rubber gasket 3 is inserted into the mating notch 2a on the internally threaded insert 2 and abuts against the inner wall of the mating notch 2a, thereby forming an installation and fixation between the rubber gasket 3 and the internally threaded insert 2. Then, the pipe fitting is formed by injection molding. Specifically, the rubber gasket 3 is provided with an inclined protrusion 3a that is radially outward. The inclined protrusion 3a is approximately annular, and the inclination angle of the inclined protrusion 3a relative to the end face of the rubber gasket 3 is 5° to 30°. The internal thread insert 2 is provided with a mating notch 2a for the inclined protrusion 3a to abut against and form a seal. The shape of the mating notch 2a is consistent with that of the inclined protrusion 3a. Therefore, when the inclined protrusion 3a is inserted into the mating notch 2a and abuts against the inner wall of the mating notch 2a, the rubber gasket 3 can be snapped and fixed with the internal thread insert 2, and an axial fixation is formed between the rubber gasket 3 and the internal thread insert 2. Because the minimum inner diameter of the rubber gasket 3 is smaller than the minimum inner diameter of the internal thread insert 2, when this pipe fitting is used, by screwing another pipe fitting with external threads to the internal thread insert 2 and continuously screwing it into the internal thread insert 2 inside the pipe fitting, one end of the externally threaded pipe fitting is on the rubber gasket 3. This ensures a seal at the threaded end of the pipe fitting after it is connected to other pipe fittings, thus preventing water leakage. This allows the liquid medium inside the pipe fitting connected to this pipe fitting to flow sequentially through the water passage and into the inner cavity of the pipe body 1. Since the rubber gasket 3 and the internal thread insert 2 in this pipe fitting are engaged by the inclined protrusion 3a and the mating notch 2a, even after being exposed to heat or external force, the rubber gasket 3 and the internal thread insert 2 can still be tightly pressed together, ensuring the sealing between the internal thread insert 2 and the rubber gasket 3 while preventing slippage. Meanwhile, when one end of another pipe fitting abuts against the rubber gasket 3 and a squeezing force is applied to the rubber gasket 3, the inclined protrusion 3a on the rubber gasket 3 will generate an upward rebound force, thereby making the inclined protrusion 3a fit more tightly against the inner wall of the mating notch 2a, thereby further improving the sealing strength of this pipe fitting after being connected with other pipe fittings.

[0043] Furthermore, such as Figures 1 to 7As shown, the rubber gasket 3 has an annular groove 3b, and the internal thread insert 2 has a snap-fit ​​part 2b that snaps into the annular groove 3b. By snapping the snap-fit ​​part 2b on the internal thread insert 2 into the annular groove 3b, together with the inclined protrusion 3a and the mating notch 2a, a double snap-fit ​​is formed between the internal thread insert 2 and the rubber gasket 3, thereby further strengthening the axial connection strength between the internal thread insert 2 and the rubber gasket 3, and further preventing the slippage between the rubber gasket 3 and the internal thread insert 2.

[0044] like Figures 1 to 7 As shown, further, the side wall of the annular groove 3b near the central axis of the rubber gasket 3 is connected to the side wall of the inclined protrusion 3a away from the central axis of the rubber gasket 3. The side wall of the annular groove 3b near the central axis of the rubber gasket 3 and the side wall of the inclined protrusion 3a away from the central axis of the rubber gasket 3 are at the same inclination angle. Therefore, when the snap-fit ​​part 2b is snapped into the annular groove 3b and the inclined protrusion 3a is snapped into the mating notch 2a at the same time, the side wall of the annular groove 3b near the central axis of the rubber gasket 3 and the side wall of the inclined protrusion 3a away from the central axis of the rubber gasket 3 can form a seal at the same time. They belong to the same sealing abutment surface, which improves the fixing strength between the internal thread insert 2 and the rubber gasket 3 and also increases the contact area of ​​the abutment seal, thereby improving the sealing performance between the internal thread insert 2 and the sealing gasket.

[0045] Furthermore, such as Figures 1 to 7 As shown, a fixing ring 2c is provided on the outer circumferential surface of the internal thread insert 2, and the thickness of the fixing ring 2c gradually increases along the central axis of the internal thread insert 2 towards the direction away from the central axis of the internal thread insert 2. Therefore, the part of the fixing ring 2c that is further away from the central axis of the internal thread insert 2 is thicker. Furthermore, from the radial section along the internal thread insert 2, the fixing ring 2c is roughly trapezoidal. Therefore, after the internal thread insert 2 and the rubber gasket 3 are snapped together and fixed, when the pipe body 1 is injection molded outside the internal thread insert 2 and the rubber gasket 3, the fixing ring 2c can strengthen the fixed connection strength between the internal thread insert 2 and the pipe body 1. Specifically, there are at least two retaining rings 2c, which are evenly distributed along the central axis of the internal thread insert 2. More specifically, there are three retaining rings 2c (one at each end of the internal thread insert 2, and the other between the two ends of the internal thread insert 2). Since the retaining rings 2c are evenly distributed along the central axis of the internal thread insert 2, the fixed connection between the tube body 1 and the internal thread insert 2 can be more stable after the tube body 1 is injection molded outside the internal thread insert 2.

[0046] like Figures 1 to 7As shown, further, a fixed edge 3c is provided on the outer edge of the rubber gasket 3, and a fixed ring 2c abuts against the rubber gasket 3. The outer circumferential surface of the fixed ring 2c abuts against the side wall of the fixed edge 3c facing the central axis of the rubber gasket 3. The fixed ring 2c at one end of the internal threaded insert abuts against the side wall of the fixed edge 3c on the outer edge of the rubber gasket 3 facing the internal threaded insert 2. This makes the radial fixation between the internal threaded insert 2 and the rubber gasket 3 more secure, making the rubber gasket 3 less likely to slip off. It also increases the contact area between the rubber gasket 3 and the internal threaded insert 2, thereby improving the stability of the fixed connection between the two and the sealing strength between them.

[0047] Furthermore, such as Figures 1 to 7 As shown, fixing blocks 2c1 are distributed circumferentially on the outer circumferential surface of the fixing ring 2c. The thickness of the fixing blocks 2c1 along the central axis of the internal thread insert 2 and along the circumferential direction of the internal thread insert 2 gradually increases in the direction away from the central axis of the internal thread insert 2. Therefore, after the tube body 1 is injection molded outside the internal thread insert 2, the fixing blocks 2c1 can further enhance the fixed connection strength between the tube body 1 and the internal thread insert 2.

[0048] like Figures 1 to 7 As shown, further, a limiting groove 3c1 is provided on the fixed edge 3c. The fixing block 2c1 on the fixing ring 2c abuts against the groove wall of the limiting groove 3c1 and forms a circumferential positioning. When the inclined protrusion 3a is engaged with the mating notch 2a and the engaging part 2b is engaged with the annular groove 3b, so that the internal thread insert 2 and the rubber gasket 3 are engaged and fixed, the fixing block 2c1 on the fixing ring 2c located at one end of the internal thread insert 2 abutting against the rubber gasket 3 can be inserted into the limiting groove 3c1. The fixing block 2c1 also abuts against the two side groove walls of the limiting groove 3c1, thereby fixing the internal thread insert 2 and the rubber gasket 3 circumferentially, thus preventing the rubber gasket 3 from rotating relative to the internal thread insert 2 when this pipe joint is used, so as to achieve the anti-rotation function, thereby further strengthening the fixed connection between the rubber gasket 3 and the internal thread insert 2.

[0049] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A pipe fitting, comprising a pipe body (1), wherein one end of the pipe body (1) is internally fitted with an internally threaded insert (2) and a rubber gasket (3) abutting against the inner end of the internally threaded insert (2), the rubber gasket (3) being approximately annular, and the minimum inner diameter of the rubber gasket (3) being smaller than the minimum inner diameter of the internally threaded insert (2), characterized in that, The rubber gasket (3) is provided with an inclined protrusion (3a) that is radially outward, and the internal thread insert (2) is provided with a mating notch (2a) for the inclined protrusion (3a) to abut against each other to form a seal.

2. A pipe fitting according to claim 1, characterized in that, The inclined protrusion (3a) is generally annular.

3. A pipe fitting according to claim 2, characterized in that, The rubber gasket (3) is provided with an annular groove (3b), and the internal thread insert (2) is provided with a snap-fit ​​part (2b) that snaps into the annular groove (3b).

4. A pipe fitting according to claim 3, characterized in that, The annular groove (3b) is connected to the side wall of the rubber pad (3) near the central axis of the rubber pad (3) and the side wall of the inclined protrusion (3a) away from the central axis of the rubber pad (3), and the side wall of the annular groove (3b) near the central axis of the rubber pad (3) and the side wall of the inclined protrusion (3a) away from the central axis of the rubber pad (3) are at the same inclination angle.

5. A pipe fitting according to claim 1, 2, 3, or 4, characterized in that, The inner thread insert (2) has a fixing ring (2c) on its outer circumferential surface, and the thickness of the fixing ring (2c) gradually increases along the central axis of the inner thread insert (2) toward the direction away from the central axis of the inner thread insert (2).

6. A pipe fitting according to claim 5, characterized in that, The fixed rings (2c) are at least two and are evenly distributed along the central axis of the internal thread insert (2).

7. A pipe fitting according to claim 6, characterized in that, The rubber pad (3) has a fixed edge (3c) on its outer edge, and a fixed ring (2c) abuts against the rubber pad (3), and the outer peripheral surface of the fixed ring (2c) abuts against the side wall of the fixed edge (3c) facing the central axis of the rubber pad (3).

8. A pipe fitting according to claim 7, characterized in that, The fixing ring (2c) has fixing blocks (2c1) distributed circumferentially on its outer circumferential surface. The thickness of the fixing blocks (2c1) along the central axis of the internal thread insert (2) and along the circumferential direction of the internal thread insert (2) gradually increases in the direction away from the central axis of the internal thread insert (2).

9. A pipe fitting according to claim 8, characterized in that, A limiting groove (3c1) is provided on the fixed edge (3c), and the fixing block (2c1) on the fixed ring (2c) abuts against the groove wall of the limiting groove (3c1) to form circumferential positioning.

10. A pipe fitting according to claim 9, characterized in that, The rubber gasket (3) has a water passage hole (3d), and the inner cavity of the internal thread insert (2) is connected to the inner cavity of the tube body (1) through the water passage hole (3d).

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