Clamping and pressing type pipe joint

Abstract

The utility model provides a clamping and pressing type pipe joint, and belongs to the technical field of pipe joints. The problem that the service life is short in a high-temperature environment is solved. A clamping and pressing type pipe joint comprises a joint body with one end being a clamping and pressing end, a sealing gasket, a check ring and a clamping ring, the sealing gasket, the check ring and the clamping ring are all arranged in the clamping and pressing end, an abutting step is arranged in the clamping and pressing end, the sealing gasket abuts against the abutting step, the check ring abuts against the position between the sealing gasket and the clamping ring, and a groove is formed in the inner circumferential wall of the sealing gasket. Receding grooves are formed in the two sides of the sealing gasket in the thickness direction of the sealing gasket respectively, and acting parts are formed between one of the receding grooves and the groove and between the other receding groove and the groove of the sealing gasket. The cable has the advantages that the service life in a high-temperature environment is prolonged, and the like.

Description

Technical Field

[0001] This utility model belongs to the field of pipe fitting technology and relates to a press-fit pipe fitting. Background Technology

[0002] Press-fit connection is a commonly used connection method in the gas transmission field. A steel pipe is inserted into the press-fit fitting, and then a press-fit tool is used to compress and deform the fitting, firmly connecting it to the steel pipe. For example, the copper pipe fitting press-fit structure disclosed in patent application number 202020037211.3 includes a pipe with annular grooves on both the left and right ends, arranged symmetrically. In the annular groove of the right end, from left to right, there is a sealing washer, a ring-shaped retaining ring, and an open retaining ring. Both the sealing washer and the retaining ring abut against the retaining ring. The sealing washer also abuts against one side of the annular groove wall, and the retaining ring abuts against the other side of the annular groove wall. The inner side of the left end of the retaining ring has a first claw protruding radially along the retaining ring, with notches dividing it into several segments. The inner side of the right end of the retaining ring has a second claw protruding radially along the retaining ring, positioned corresponding to the notches. During connection, the steel pipe is inserted into the right end of the pipe, and then the clamping tool is used to clamp the right end of the pipe to shrink and deform it. At the same time, the first and second clamps of the clamping ring will be embedded into the outer wall of the steel pipe, and the sealing gasket will abut against the outer wall of the steel pipe to form a seal, thereby making the steel pipe firmly connected.

[0003] Under high temperatures, the sealing gasket will expand. However, since the sealing gasket is a conventional O-ring, and it abuts against both one side wall and the bottom wall of the annular groove, the excess material due to expansion has no room to flow and is instead compressed against the side wall of the steel pipe. This reduces the compressive stress on the sealing gasket. While this condition doesn't affect the sealing performance over a long period, the reduced compressive stress causes the rubber to harden and age, thus shortening its service life. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a press-fit pipe fitting that solves the problem of short service life under high-temperature environments.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] A press-fit pipe fitting includes a fitting body with a press-fit end at one end, and a sealing washer, a retaining ring, and a retaining ring all disposed within the press-fit end. The press-fit end has an abutting step, the sealing washer abuts against the abutting step, and the retaining ring abuts between the sealing washer and the retaining ring. The sealing washer is characterized in that its inner peripheral wall has a groove, and the sealing washer has relief grooves on both sides along its thickness direction. The sealing washer forms an active part between one relief groove and the groove, and between the other relief groove and the groove.

[0007] Similar to existing methods, this press-fit pipe fitting is used by inserting the steel pipe to be connected into the press-fit end, and then using a press-fit tool to squeeze the press-fit end. This causes the entire press-fit end to contract radially, thus the retaining ring clamps the outer wall of the steel pipe, securing the pipe firmly. Simultaneously, the two working parts of the sealing gasket abut against the outer wall of the steel pipe to form a seal. When used in high-temperature environments, the sealing gasket expands due to heat. Because the working parts are formed by the portion of the sealing gasket between the relief groove and the recess, when the sealing gasket expands due to heat, the two working parts deform away from the outer wall of the steel pipe using the two relief grooves. This means that the two relief grooves provide space for the excess portion of the sealing gasket due to expansion, increasing the compressive stress during expansion, slowing down its hardening and aging process, and thus extending the service life of this press-fit pipe fitting.

[0008] In the aforementioned press-fit pipe fitting, the groove is located at the middle position of the sealing gasket along its thickness direction, and the two clearance grooves are symmetrically arranged.

[0009] The above settings ensure that during the compression process, one working part will not contact the outer wall of the steel pipe while the other working part is suspended in the air, thus guaranteeing the reliability of the seal.

[0010] In the aforementioned press-fit pipe fitting, both relief grooves are V-shaped. The V-shape allows the active part to deform more easily when heated to ensure sufficient compression pressure on the sealing gasket.

[0011] In the aforementioned press-fit pipe fitting, the inner side of the press-fit end has an annular retaining flange, and a protective ring is abutting between the retaining ring and the annular retaining flange. The inner wall of the protective ring protrudes radially beyond the inner wall of the annular retaining flange.

[0012] In practice, the inner diameter of the protective ring matches the outer diameter of the steel pipe, and the inner wall of the protective ring abuts against the outer wall of the steel pipe. The protective ring isolates the retaining ring inside the clamping end, so that rainwater cannot come into contact with the retaining ring, thereby ensuring that the retaining ring will not be corroded.

[0013] In the aforementioned press-fit pipe fitting, the protective ring is elastic, and the outer peripheral wall of the protective ring is uniformly provided with several protrusions along the circumferential direction. Each protrusion is plate-shaped and abuts against the inner wall of the press-fit end.

[0014] For the steel pipe to pass smoothly through the protective ring, the outer periphery of the protective ring must be positioned to prevent it from moving. To achieve this, the protective ring is designed to be elastic, with several protrusions evenly distributed along its outer periphery. Each protrusion is plate-shaped and abuts against the inner wall of the clamping end. This not only positions the outer periphery of the protective ring but also provides space for material flow during clamping, ensuring that the clamping ring is effectively contained within the clamping end.

[0015] In the aforementioned press-fit pipe fitting, the protective ring is made of polytetrafluoroethylene (PTFE).

[0016] Polytetrafluoroethylene (PTFE) has excellent corrosion resistance, so protective rings made of PTFE can effectively repel rainwater.

[0017] Compared with existing technologies, this press-fit pipe fitting has a groove on the inner circumferential wall of the sealing gasket, and relief grooves on both sides of the sealing gasket along its thickness direction. The sealing gasket forms an active part between one relief groove and the inner groove, and between the other relief groove and the inner groove. When the sealing ring expands due to heat, the two active parts will deform away from the outer wall of the steel pipe with the help of the two relief grooves. It is equivalent to the two relief grooves providing space for the extra part of the sealing gasket due to expansion. This increases the compressive stress of the sealing gasket during expansion, slows down its hardening and aging rate, and thus extends the service life of this press-fit pipe fitting. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of the press-fit pipe fitting.

[0019] Figure 2 yes Figure 1 Sectional view at point AA.

[0020] In the figure, 1. Connector body; 1a. Crimping end; 1a1. Abutting step; 1a2. Annular retaining edge; 1b. Limiting step; 2. Sealing gasket; 2a. Groove; 2b. Relief groove; 2c. Actuating part; 3. Retaining ring; 4. Snap ring; 4a. Claw one; 4b. Claw two; 5. Protective ring; 5a. Protrusion; Detailed Implementation

[0021] 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.

[0022] like Figure 1 As shown, a press-fit pipe fitting includes a fitting body 1 with a press-fit end 1a at one end, and a sealing washer 2, a retaining ring 3, and a retaining ring 4 all disposed within the press-fit end 1a. The press-fit end 1a has an abutting step 1a1, the sealing washer 2 abuts against the abutting step 1a1, and the retaining ring 3 abuts between the sealing washer 2 and the retaining ring 4. The retaining ring 4 has several first-jaw claws 4a and several second-jaw claws 4b protruding circumferentially. The first-jaw claws 4a and the second-jaw claws 4b are aligned axially along the fitting body 1, and are spaced apart circumferentially. The retaining ring 4 is an alloy component and has a fracture surface, which allows the retaining ring 4 to contract under compression. The connector body 1 also has a limiting step 1b. The abutment step 1a1 is closer to the port of the crimping end 1a than the limiting step 1b. The limiting step 1b is used to abut against the end of the steel pipe inserted into the crimping end 1a. In use, the steel pipe to be connected is inserted into the crimping end 1a until it abuts against the limiting step 1b. Then, a crimping tool is used to press the crimping end 1a, causing the entire crimping end 1a to contract radially. As the crimping end 1a contracts, the retaining ring 4 contracts along with it due to the reduced size at the break point. This causes each of the retaining claws 4a and each retaining ring 4b to embed into the outer wall of the steel pipe, thus firmly connecting the steel pipe to the crimping pipe connector. Simultaneously, the sealing gasket 2 abuts against the outer wall of the steel pipe to form a seal.

[0023] Furthermore, such as Figure 1As shown, the inner circumferential wall of the sealing gasket 2 is provided with a groove 2a, and the sealing gasket 2 has relief grooves 2b on both sides along its thickness direction. An active part 2c is formed between one relief groove 2b and the groove 2a, and between the other relief groove 2b and the groove 2a. During the contraction of the compression end 1a, the two active parts 2c abut against the outer wall of the steel pipe. When used in a high-temperature environment, the sealing gasket 2 expands due to heat. Because the active part 2c is formed by the portion of the sealing gasket 2 between the relief groove 2b and the groove 2a, when the sealing gasket 2 expands due to heat, the two active parts 2c deform away from the outer wall of the steel pipe with the help of the two relief grooves 2b. This means that the two relief grooves 2b provide space for the excess portion of the sealing gasket 2 due to expansion, thus increasing the compressive stress of the sealing gasket 2 during expansion, slowing down its hardening and aging, and extending the service life of this compression-type pipe fitting. The groove 2a is located at the middle position along the thickness direction of the sealing gasket 2, and the two relief grooves 2b are symmetrically arranged. This arrangement ensures that during the contraction of the compression end 1a, one working part 2c will not contact the outer wall of the steel pipe while the other working part 2c remains suspended, thus guaranteeing the reliability of the seal. In this embodiment, both relief grooves 2b are V-shaped. By setting the relief grooves 2b to a V-shape, this shape allows the working part 2c to deform more easily during thermal expansion, ensuring the compressive stress of the sealing gasket 2.

[0024] Furthermore, such as Figure 1 and Figure 2 As shown, the inner side of the clamping end 1a has an annular retaining flange 1a2. A protective ring 5 is abutted between the retaining ring 4 and the annular retaining flange 1a2. The inner wall of the protective ring 5 protrudes radially beyond the inner wall of the annular retaining flange 1a2. The inner diameter of the protective ring 5 matches the outer diameter of the steel pipe. The protective ring 5 isolates the retaining ring 4 within the clamping end 1a, preventing rainwater from contacting the retaining ring 4 and thus ensuring that the retaining ring 4 is not corroded. The protective ring 5 is elastic, and its outer peripheral wall is uniformly provided with several protrusions 5a along the circumference. Each protrusion 5a is plate-shaped and abuts against the inner wall of the clamping end 1a. The protective ring 5 is made of polytetrafluoroethylene (PTFE). PTFE has good corrosion resistance, therefore, the protective ring 5 made of PTFE can effectively isolate rainwater.

[0025] In this embodiment, as Figure 1 As shown, the connector body 1 is a straight-through type, and both ends of the connector body 1 are crimp ends 1a, and the structures of both ends of the connector body 1 are the same.

[0026] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model 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 this utility model or exceeding the scope defined by the appended claims.

Claims

1. A press-fit pipe fitting, comprising a fitting body (1) with one end being a press-fit end (1a) and a sealing washer (2), a retaining ring (3), and a retaining ring (4) all disposed within the press-fit end (1a), wherein the press-fit end (1a) has an abutting step (1a1), the sealing washer (2) abuts against the abutting step (1a1), and the retaining ring (3) abuts between the sealing washer (2) and the retaining ring (4), characterized in that, The inner peripheral wall of the sealing gasket (2) is provided with a groove (2a), and the sealing gasket (2) is provided with a displacement slot (2b) on each side along the thickness direction of the sealing gasket (2), and the sealing gasket (2) forms an action part (2c) between one displacement slot (2b) and the groove (2a) and between the other displacement slot (2b) and the groove (2a).

2. A crimped pipe coupling according to claim 1, wherein The groove (2a) is located at the middle position of the sealing gasket (2) along the thickness direction of the sealing gasket (2), and the two displacement slots (2b) are symmetrically arranged.

3. A compression fitting according to claim 2, wherein The two displacement slots (2b) are both V-shaped.

4. A push-to-connect pipe fitting according to claim 1 or 2 or 3, wherein, The inner side of the port of the clamping end (1a) is provided with an annular stop (1a2), and the annular stop (1a2) is further provided with a protective ring (5) in abutment, and the inner side wall of the protective ring (5) protrudes radially outward of the inner side wall of the annular stop (1a2).

5. A crimped pipe coupling according to claim 4, wherein The protective ring (5) is elastic, and the outer peripheral wall of the protective ring (5) is uniformly provided with a plurality of protruding portions (5a) in the circumferential direction, each protruding portion (5a) is in the form of a sheet, and each protruding portion (5a) is in abutment with the inner wall of the clamping end (1a).

6. A crimped pipe coupling according to claim 5, wherein, The protective ring (5) is a polytetrafluoroethylene piece.

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