Anti-leakage ferrule type pipe joint

Abstract

The utility model discloses an anti-leakage ferrule type pipe joint which comprises a joint body, a conical ferrule and a nut, wherein the conical ferrule is arranged outside a pipeline in a sleeving mode, and the nut is used for locking the conical ferrule. A conical sealing face matched with the conical clamping sleeve is arranged in the connector body, a first sealing groove is formed between the conical sealing face and the conical clamping sleeve, and a first sealing ring is embedded in the first sealing groove. A second sealing groove is formed between the conical clamping sleeve and the pipeline, and a second sealing ring is embedded in the second sealing groove. A third sealing groove is formed between the connector body and the pipeline, a third sealing ring is embedded in the third sealing groove, the conical clamping sleeve is sleeved with a locking ring, the outer wall of the locking ring is provided with a plurality of locking teeth, and the locking teeth are annularly distributed at equal intervals. And meanwhile, the sealing performance of multiple contact surfaces is kept, and the firmness of the sealing ring is improved through the pressing block abutting against the sealing ring.

Description

Technical Field

[0001] This utility model relates to the technical field of compression fittings, and in particular to a leak-proof compression fitting. Background Technology

[0002] Compression fittings are devices used for pipe connections. They mainly consist of three parts: the fitting body, the ferrule, and the nut. The working principle is that by tightening the nut, the outer side of the front end of the ferrule fits against the conical surface of the fitting body, and the inner edge bites evenly into the seamless steel pipe, thereby forming an effective seal.

[0003] Currently, pipe fittings mainly use ordinary quick-connect fittings, which have unsatisfactory fire resistance and lack static electricity elimination function, making them unsuitable for certain special media fluids such as flammable fluids and pipelines installed in high-temperature environments.

[0004] To address the problems mentioned above, for example, application number CN201720345532.8 discloses a compression fitting, including a fitting body, a compression ferrule, a nut, and a sleeve. The compression ferrule is installed at one end of the fitting body and fixed by the nut. The inner and outer surfaces of the sleeve are respectively threaded. The sleeve is installed on the outer surface of the other end of the fitting body. The inner and outer sides of the resin body of the sleeve are respectively provided with a conductive fiber layer and a carbon fiber coating layer. This utility model provides a protective sleeve on the surface of the fitting body. The conductive fiber layer and the carbon fiber coating layer can effectively eliminate static electricity generated during use. At the same time, the carbon fiber coating can greatly improve the fire resistance of the fitting and can be widely used in the installation and connection of pipelines in flammable fluids and high-temperature environments.

[0005] However, the above structure still has the following drawbacks:

[0006] When using the above structure, the pipe fitting is usually installed inside the connector body, and then the ferrule is installed on the outside of the pipe fitting. The nut is then tightened to make the ferrule fit tightly against the outside of the pipe fitting, thereby achieving a fixing effect. However, this structure still has gaps at the connection, so there is a risk of leakage.

[0007] To address the problems mentioned above, for example, application number CN202122316743.8 discloses a leak-proof compression fitting copper pipe connector, including a connector body, a nut, and a compression fitting. A hexagonal nut is fixed at the middle position of the outer side wall of the connector body. Threads are provided on the outer side walls of both ends of the connector body. Two nuts are screwed onto the outside of the threads. Pipes are installed at both ends of the connector body. A compression fitting is fitted onto the outer side wall of the pipe. By providing sealing rings between the compression fitting and the connector body, between the compression fitting and the pipe, and between the connector body and the pipe, the sealing performance between these three types of fittings can be improved. This ensures that after the compression fitting is installed, both pairs of fittings are in a sealed state, enhancing the sealing performance and preventing leakage.

[0008] However, the above structure still has the following drawbacks:

[0009] 1. Multiple sealing rings need to be precisely installed between the ferrule, the fitting body, and the pipe. Misalignment or omission can easily lead to sealing failure, which is especially unfriendly to inexperienced operators.

[0010] 2. After prolonged use, the sealing ring is prone to displacement due to external vibrations, thus affecting the sealing effect. Summary of the Invention

[0011] The purpose of this invention is to solve the problems in the prior art by proposing a leak-proof compression fitting pipe joint that can reduce the risk of misalignment, maintain the sealing of multiple contact surfaces, and improve the firmness of the sealing ring by pressing against the sealing ring with a pressure block.

[0012] To achieve the above objectives, this utility model proposes a leak-proof compression fitting pipe joint, comprising a fitting body, a conical compression fitting fitted onto the outside of a pipe, and a nut for locking the conical compression fitting; the interior of the fitting body is provided with a conical sealing surface adapted to the conical compression fitting, a first sealing groove is formed between the conical sealing surface and the conical compression fitting, and a first sealing ring is embedded in the first sealing groove; a second sealing groove is formed between the conical compression fitting and the pipe, and a second sealing ring is embedded in the second sealing groove; a third sealing groove is formed between the fitting body and the pipe, and a third sealing ring is embedded in the third sealing groove.

[0013] Preferably, the tapered sleeve is fitted with a locking ring, and the outer wall of the locking ring is provided with a plurality of locking teeth, which are distributed in a ring at equal intervals.

[0014] Preferably, the conical sealing surface inside the connector body is provided with a locking groove that is adapted to the locking ring, and the locking groove is provided with a plurality of teeth that mesh with the locking teeth.

[0015] Preferably, through holes are provided on both sides of the first sealing groove, the second sealing groove and the third sealing groove, and an elastic support column is installed in each of the through holes. One end of the elastic support column is connected to the end wall of the through hole, and the other end of the elastic support column is connected to a pressure block. A return spring is sleeved on the outer wall of the elastic support column.

[0016] Preferably, the pressure blocks are arranged symmetrically on the left and right sides, and the pressure blocks are used to abut against the sealing ring.

[0017] Preferably, the outer surface of the connector body is provided with an indicator ring for the sealing status, and the color of the indicator ring changes with the compression deformation of the sealing structure.

[0018] The beneficial effects of this utility model are:

[0019] 1. By opening a first sealing groove, a second sealing groove, and a third sealing groove, this utility model enables the first sealing ring, the second sealing ring, and the third sealing ring to be accurately embedded in the corresponding sealing groove, thereby reducing the risk of misalignment and maintaining the sealing performance of multiple contact surfaces. This improves the sealing performance between the conical ferrule and the connector body, between the conical ferrule and the pipe, and between the connector body and the pipe, ensuring that after the ferrule connector is installed, both pairs are in a sealed state, thus improving the sealing performance.

[0020] 2. This utility model, through the combined action of the elastic support column, the return spring, and the pressure block, can fix the sealing ring. When the sealing ring is embedded in the sealing groove, the pressure blocks on both sides are squeezed and push the elastic support column inward. At this time, the return spring stores energy and contracts. When the sealing ring is fully in place, the return spring releases its elastic potential energy, pushing the pressure block to apply radial pressure to the outer wall of the sealing ring. This process forms an initial preload, ensuring a tight fit between the sealing surfaces. When the sealing ring expands under the pressure of the medium, the elastic support column allows the pressure block to slightly retract, avoiding excessive compression that could lead to sealing failure. At the same time, during long-term use, when the sealing ring wears or ages, the return spring continuously provides compensating pressure to maintain the contact strength of the sealing interface. Furthermore, the progressive reset characteristic of the return spring guides the pressure block to move in parallel, ensuring uniform circumferential force on the sealing ring and eliminating the problem of local stress concentration caused by traditional rigid compression. Attached Figure Description

[0021] Figure 1 This is a front view of a leak-proof compression fitting of this utility model;

[0022] Figure 2 This is an exploded view of a leak-proof compression fitting pipe joint according to this utility model;

[0023] Figure 3 This is a cross-sectional view of the connector body of a leak-proof compression fitting type pipe fitting according to this utility model;

[0024] Figure 4This is an enlarged schematic diagram of point A of a leak-proof compression fitting pipe joint according to this utility model;

[0025] Figure 5 This is a cross-sectional view of the tapered ferrule of a leak-proof ferrule-type pipe fitting according to this utility model;

[0026] In the figure: 1-Connector body, 101-Conical sealing surface, 1011-First sealing groove, 10111-First sealing ring, 102-Third sealing groove, 1022-Third sealing ring, 2-Pipe, 3-Conical ferrule, 301-Second sealing groove, 3011-Second sealing ring, 302-Locking ring, 3022-Locking tooth, 4-Nut, 5-Locking groove, 501-Groove tooth, 6-Through hole, 601-Elastic support column, 602-Pressure block, 603-Reset spring, 7-Indicator ring. Detailed Implementation

[0027] See Figures 1 to 5 This utility model discloses a leak-proof compression fitting pipe joint, comprising a fitting body 1, a conical compression sleeve 3 fitted onto the outside of a pipe 2, and a nut 4 for locking the conical compression sleeve 3; the fitting body 1 has a conical sealing surface 101 adapted to the conical compression sleeve 3 inside, a first sealing groove 1011 is formed between the conical sealing surface 101 and the conical compression sleeve 3, and a first sealing ring 10111 is embedded in the first sealing groove 1011; a second sealing groove 301 is formed between the conical compression sleeve 3 and the pipe 2, and a second sealing ring 3011 is embedded in the second sealing groove 301; A third sealing groove 102 is provided between the connector body 1 and the pipe 2. A third sealing ring 1022 is embedded in the third sealing groove 102. By providing the first sealing groove 1011, the second sealing groove 301, and the third sealing groove 102, the first sealing ring 10111, the second sealing ring 3011, and the third sealing ring 1022 can be accurately embedded in the corresponding sealing grooves, thereby reducing the risk of misalignment and maintaining the sealing performance of multiple contact surfaces. This improves the sealing performance between the conical ferrule 3 and the connector body 1, between the conical ferrule 3 and the pipe 2, and between the connector body 1 and the pipe 2.

[0028] See Figure 2 and Figure 3 The tapered sleeve 3 is fitted with a locking ring 302 on its outer side. The outer wall of the locking ring 302 is provided with a plurality of locking teeth 3022, which are distributed in a ring at equal intervals.

[0029] See Figure 3 The conical sealing surface 101 inside the connector body 1 is provided with a locking groove 5 that is adapted to the locking ring 302. The locking groove 5 is provided with a plurality of groove teeth 501 that mesh with the locking teeth 3022. By the meshing of the locking teeth 3022 and the groove teeth 501, the connection between the conical sleeve 3 and the connector body 1 is improved.

[0030] See Figure 4 The first sealing groove 1011, the second sealing groove 301, and the third sealing groove 102 all have through holes 6 on both sides. Each through hole 6 has an elastic support column 601 installed inside it. One end of the elastic support column 601 is connected to the end wall of the through hole 6, and the other end of the elastic support column 601 is connected to a pressure block 602. A return spring 603 is sleeved on the outer wall of the elastic support column 601. When the sealing ring wears or ages during long-term use, the return spring 603 continuously provides compensation pressure to maintain the contact strength of the sealing interface. The progressive return characteristic of the return spring 603 guides the pressure block 602 to move in parallel, ensuring that the sealing ring is subjected to uniform force in the circumference and eliminating the problem of local stress concentration caused by traditional rigid compression.

[0031] See Figure 4 The pressure blocks 602 are arranged symmetrically on the left and right sides. The pressure blocks 602 are used to abut against the sealing ring. When the sealing ring is embedded in the sealing groove, the pressure blocks 602 on both sides are squeezed and push the elastic support column 601 to retract inward. At this time, the return spring 603 stores energy and retracts. When the sealing ring is fully in place, the return spring 603 releases elastic potential energy and pushes the pressure blocks 602 to apply radial pressure to the outer wall of the sealing ring. This process forms an initial pre-tightening force to ensure that the sealing surface fits tightly.

[0032] See Figure 1 and Figure 3 The outer surface of the connector body 1 is provided with a sealing status indicator ring 7. The color of the indicator ring 7 changes with the compression deformation of the sealing structure. When the sealing ring ages or friction generates heat, the local temperature of the connector body 1 rises. The indicator ring 7 is made of a thermosensitive material (such as liquid crystal polymer), and displays color differences when the temperature changes. Therefore, the sealing status can be quickly determined by color or position changes without disassembling the connector body 1.

[0033] The working process of this utility model:

[0034] In operation, this leak-proof compression fitting of the present invention, by tightening the nut 4, causes the outer front end of the conical compression sleeve 3 to fit against the conical surface of the fitting body 1. Simultaneously, each sealing ring is embedded in its corresponding sealing groove. When the sealing ring is embedded in the sealing groove, the pressure blocks 602 on both sides are compressed, pushing the elastic support column 601 inward. At this time, the return spring 603 stores energy and contracts. When the sealing ring is fully in place, the return spring 603 releases its elastic potential energy, pushing the pressure blocks 602 to apply radial pressure to the outer wall of the sealing ring. This process forms an initial pre-tightening force, ensuring the sealing surface is in contact with the sealing surface. The joint is tightly sealed by a first sealing groove 1011 between the conical sealing surface 101 and the conical sleeve 3, which allows the first sealing ring 10111 to form a seal between the joint body 1 and the conical sleeve 3; a second sealing groove 301 between the conical sleeve 3 and the pipe 2, which allows the second sealing ring 3011 to form a seal between the conical sleeve 3 and the pipe 2; and a third sealing groove 102 between the joint body 1 and the pipe 2, which allows the third sealing ring 1022 to form a seal between the joint body 1 and the pipe 2.

[0035] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the protection scope of the present invention.

Claims

1. A leak-proof compression fitting, characterized in that: The device includes a connector body (1), a conical sleeve (3) fitted onto the outside of a pipe (2), and a nut (4) for locking the conical sleeve (3). The connector body (1) has a conical sealing surface (101) that is adapted to the conical sleeve (3) inside. A first sealing groove (1011) is formed between the conical sealing surface (101) and the conical sleeve (3), and a first sealing ring (10111) is embedded in the first sealing groove (1011). A second sealing groove (301) is formed between the conical sleeve (3) and the pipe (2), and a second sealing ring (3011) is embedded in the second sealing groove (301). A third sealing groove (102) is formed between the connector body (1) and the pipe (2), and a third sealing ring (1022) is embedded in the third sealing groove (102).

2. The leak-proof compression fitting as described in claim 1, characterized in that: The tapered sleeve (3) is fitted with a locking ring (302) on its outer side. The outer wall of the locking ring (302) is provided with a plurality of locking teeth (3022), which are distributed in a ring at equal intervals.

3. The anti-leakage compression fitting as described in claim 2, characterized in that: The conical sealing surface (101) inside the connector body (1) is provided with a locking groove (5) that is compatible with the locking ring (302). The locking groove (5) is provided with a plurality of groove teeth (501) that mesh with the locking teeth (3022).

4. The anti-leakage compression fitting as described in claim 1, characterized in that: The first sealing groove (1011), the second sealing groove (301) and the third sealing groove (102) are all provided with through holes (6) on both sides. Each through hole (6) is equipped with an elastic support column (601). One end of the elastic support column (601) is connected to the end wall of the through hole (6), and the other end of the elastic support column (601) is connected to a pressure block (602). A reset spring (603) is sleeved on the outer wall of the elastic support column (601).

5. A leak-proof compression fitting as described in claim 4, characterized in that: The pressure block (602) is arranged symmetrically on the left and right sides, and the pressure block (602) is used to abut against the sealing ring.

6. The anti-leakage compression fitting as described in claim 1, characterized in that: The outer surface of the connector body (1) is provided with a sealing status indicator ring (7), the color of which changes with the compression deformation of the sealing structure.

Images