CN115111447B - Mechanical buckle pipe fitting - Google Patents

Abstract

The present invention relates to the field of pipelines, and specifically to a pipeline connecting pipe fitting. A mechanical snap-fit pipe fitting is applied to copper pipes and flexible pipes, comprising a pipe fitting body, a locking thread and a locking connection cap matched with the locking thread, wherein the pipe fitting body has a higher hardness than the pipe connected; a coaxial and integral snap-fit part extends from the front section of the locking thread, the snap-fit part has an arched cross section, the front end outer diameter is an inner bevel structure, the front end inner side is provided with a triangular clamping tooth, and the rear end of the clamping tooth is also provided with a compression cavity part; the inner side of the locking connection cap is provided with a bevel that cooperates with the inner bevel structure. The snap-fit part structure of the present invention eliminates the problem of eccentricity of the installation components, reduces the structural and installation risks brought by the components, and forms multiple sealing and anti-pullout structures through the clamping teeth, making the installation safer and more reliable; the pipe fitting structure is simple and practical, and the installation is more convenient, which has market promotion value.

Description

A mechanical buckle pipe fitting

Technical Field

The invention relates to the field of pipelines, and in particular to a pipeline connecting pipe fitting.

Background Art

The pipeline system adopts different pipe connection methods according to the characteristics of the pipes. With the development of technology, the connection safety characteristics of pipe fittings such as pull-out resistance and sealing are becoming higher and higher, and more and more connection structures are developing.

At present, copper pipes and flexible pipes are widely used in building pipes such as water supply pipes, heating pipes, hot and cold water pipes, etc. Flexible pipes include aluminum-plastic pipes, high-temperature resistant polyethylene pipes, polybutylene pipes, etc. There are many ways to connect these pipes, such as ferrule fittings, compression fittings, sliding fittings, quick-insert fittings, etc., and each has its own advantages and disadvantages. Ferrule fittings are similar to the "Fittings with Reducing Ferrules" shown in the authorization announcement number CN101266002B, including a pipe body, a clamping ring, and a locking nut. The connection operation can be completed with universal tools such as wrenches, without the help of special tools. It is suitable for conventional pipeline construction and home DIY. This type of mechanical installation method is simple to operate and has a wide range of uses, and is well received. However, there are also some problems with mechanically connected ferrule fittings. For example, the clamping ring is greatly affected by the pipe, fittings and locking nut during installation, resulting in eccentricity, which causes unilateral force on the compressed pipe and damages the pipe. In the long term, it will cause leakage at the connection. In particular, the pipeline medium will vibrate during the flow impact process, which will accelerate the damage to the pipe and create safety hazards.

Summary of the invention

In view of the existing situation, the present invention provides a new mechanical connection structure for pipelines, which eliminates the problem of eccentric installation of pipeline accessories and makes the installation safer and more reliable. At the same time, a shockproof ring is added to the pipe structure to reduce the influence of pipeline vibration on the connection structure.

To achieve the above object, the present invention adopts the following technical solutions:

A mechanical snap-fit pipe fitting is used on copper pipes and flexible pipes, comprising a pipe fitting body, a locking thread and a locking connection cap matched with the locking thread, wherein the pipe fitting body has a higher hardness than the pipe connected; a coaxial and integral snap-fit part extends from the front section of the locking thread, the snap-fit part has an arched cross section, the front end outer diameter is an inner bevel structure, the front end inner side is provided with a triangular snap-fit tooth, and a compression cavity part is also provided at the rear end of the snap-fit tooth; the rear end of the snap-fit part is an inner circular hole matched with the outer diameter of the pipe; the inner side of the locking connection cap is provided with a bevel matched with the inner bevel structure.

The solution of the present invention may also be:

An elastic ring for isolating vibration and stabilizing rotation is also arranged in the groove on the inner side of the inclined front end of the locking connection cap.

The latch teeth are pressed into the outer wall of the pipe under the pressure of the inclined surface of the locking connection cap to form a sealing and anti-pullout node.

A sealing groove is arranged inside the locking thread, and a sealing ring is arranged inside the sealing groove.

The latch teeth are provided with two or more to form a multiple sealing structure.

The utility model also comprises a tube inner support which is installed at the end of the tube and extends to the position of the clamping teeth.

The elastic ring is made of rubber or plastic material and is closely attached to the outer wall of the pipe.

The sealing ring is a U-shaped rubber ring.

A mechanical buckle pipe fitting of the present invention extends a coaxially fixed buckle part from the threaded connection part of the pipe fitting, and the problem of eccentric installation is eliminated through the structure, reducing the structural and installation risks caused by the components and components, and at the same time, multiple sealing and anti-pullout structures are formed through the clamping teeth, making the installation safer and more reliable; the design also adds an elastic ring for isolating vibration and stabilizing rotation, reducing the vibration problem of pipeline operation, and further improving the long-term stability and safety of the pipeline connection. The pipe fitting provides a new mechanical connection structure for pipelines, which is simple and practical in design, more convenient to install, and has market promotion value.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic cross-sectional view of a three-dimensional structure of a mechanical buckle pipe fitting according to the first embodiment of the present invention;

FIG2 is a schematic diagram of the three-dimensional structure of the pipe body of the first embodiment;

FIG3 is a schematic diagram of the full cross-section structure of the mechanical clip pipe fitting of the second embodiment.

DETAILED DESCRIPTION

The preferred embodiments of the present invention are further described below in conjunction with the accompanying drawings.

As shown in Figures 1 and 2, a preferred embodiment 1 is a mechanical snap-fit pipe fitting, which is used on copper pipes and flexible pipes, including a pipe fitting body 1, on which a locking thread 10 is provided, and a locking connection cap 2 matched with the locking thread 10, wherein the pipe fitting body 1 has a higher hardness than the pipe 3 connected thereto; a coaxial and integral snap-fit portion 11 is extended from the front section of the locking thread 10, the snap-fit portion 11 has an arched cross-section, an inner bevel structure 12 at the front end outer diameter, a triangular snap-fit tooth 13 at the inner side of the front end, and a compression cavity portion 14 is further provided at the rear end of the snap-fit portion 11; an inner circular hole 15 matching the outer diameter of the pipe 3 is provided at the rear end of the snap-fit cap 2; a bevel 20 matching the inner bevel structure 12 is provided on the inner side of the locking connection cap 2.

The pipe fitting of this embodiment is a mechanical connection pipe fitting. By tightening the locking connection cap 2, the matching buckle part 11 is deformed and the deformation direction of the buckle part 11 is guided, so that the pipe 3 at this position is further deformed and concave and inserted into the outer wall of the pipe. The clamping teeth 13 not only prevent the pipe from being pulled out during deformation, but also play a sealing role. As shown in Figure 2, the clamping teeth 13 are a complete annular structure with no partition in the middle and a triangular cross section, which plays the role of sealing ribs. There is no O-ring and the aging problem is reduced. In order to achieve reasonable functions, a compression cavity part 14 is also provided at the rear end of the clamping teeth 13 to promote the deformation of the clamping teeth 13 and provide deformation space; the concave compression cavity part 14 also has the function of deformation guidance to prevent the buckle part 11 from deforming in the opposite direction.

The buckle part 11 extends from the locking thread 10 and extends in a step-like manner on the locking thread 10. The locking thread 10 is also provided with a front end face 18. The buckle part 11 has a relatively uniform thickness, and the rear end is an inner circular hole 15 that matches the outer diameter of the pipe 3. There is no similar tooth structure at the rear end of the buckle part 11, so that the buckle part 11 is subjected to a single circle of internal squeezing force at the position of the tooth 13. The advantage of this is that it prevents multiple circles from being subjected to force, which interferes with the sealing effect. For example, if there are two depressions, the depth of the tooth 13 inserted into the outer wall of the pipe 3 is affected, and the locking connection cap 2 is continuously screwed in. The two separated tooth structures are deformed, and the distance change will damage the outer wall of the pipe, and the sealing effect cannot be achieved, and the anti-pullout and shock-absorbing effects will also be reduced.

In order to allow the latch 13 to be inserted into the outer wall of the pipe 3, the hardness of the latch 13 must be higher than that of the outer wall of the pipe 3. For example, the outer wall of the pipe 3 is made of plastic material such as aluminum-plastic pipe, high-temperature resistant polyethylene pipe, cross-linked polyethylene pipe, etc., and the pipe body 1 and the latch 13 are made of stainless steel or brass; the pipe 3 is made of soft copper, and the pipe body 1 and the latch 13 can be made of stainless steel or brass with a hardness higher than that of copper, so that the hardness is different. If the hardness of the pipe 3 is higher than that of the pipe body 1 and the latch 13, it may cause sealing failure and low tensile strength, and there is a connection risk. This embodiment is a silane cross-linked polyethylene pipe and a pipe body 1 made of brass. However, in the actual installation process, the material of the pipe 3 is relatively soft, and the deformation of the buckle part 11 will cause the pipe 3 to deform too much. An inner pipe support 5 is added, which is installed at the end of the pipe 3 and extends to the position of the latch 13 to provide support strength and prevent excessive deformation of the pipe 3. The inner pipe support 5 can be made of copper, hard plastic, stainless steel and other materials.

In the actual operation process, it was found that the buckle part 11 was easy to break or the deformation was insufficient during the deformation process. Therefore, the present application makes further structural and material processing. For example, if the pipe body 1 is made of brass, the brass material is processed after the tempering process to increase the toughness and resilience of the material. A thread groove 22 and a limit surface 23 are added to the rear end of the internal thread 21 of the locking connection cap 2. The thread groove 22 prevents the threaded connection from getting stuck, and the limit surface 23 cooperates with the front end surface 18 of the locking thread 10 to prevent the thread from over-rotating. The design of the above structure and size can control the tightening amount and the deformation of the buckle part 11, prevent the deformation from being too small or excessive, and make the connection safer and more reliable.

In this embodiment, the locking connection cap 2 has a hexagonal cap structure on the outside, which is convenient for hexagonal wrench operation. The outside can also be set as a slot to tighten with a general tool such as a crescent wrench.

An elastic ring 4 for isolating vibration and stabilizing rotation is also provided in the groove 21 inside the front end of the inclined surface 20 of the locking connection cap 2. The pipeline will vibrate under the flow of the medium. Long-term vibration will loosen the threads at the connection, resulting in a reduction in the deformation of the buckle part 11. For this reason, an elastic ring 4 is provided at the front end of the buckle part 11, that is, the front end of the inclined surface 20 of the locking connection cap 2. During vibration, the elastic ring 4 continuously deforms to offset part of the vibration energy, reducing the vibration impact caused by the flow of the medium, which is beneficial to prolonging the long-term safety of the pipe connection. The elastic ring 4 is made of rubber or plastic material, has viscoelastic high damping characteristics, and is tightly attached to the outer wall of the pipe 3 after installation. The plastic material is TPU, polyurethane and other materials. The elastic ring 4 is used on the copper tube, and the effect is particularly obvious.

The latch teeth 13 are pressed by the inclined surface 20 of the locking connection cap 2 and penetrate into the outer wall of the pipe 3 to form a sealing and anti-pulling node. Two or more latch teeth 13 are provided to form a multiple sealing structure. In this embodiment, two circles of latch teeth 13 are provided, and one circle of latch teeth 13 can also be provided.

The pipe fitting structure of this embodiment has few components and is simple.

A mechanical buckle pipe fitting of the present invention extends a coaxial and fixed buckle part from the threaded connection part of the pipe fitting, which eliminates the problem of eccentricity of the installation components, reduces the structural and installation risks caused by the components, and forms multiple sealing and anti-pullout structures through the clamping teeth, making the installation safer and more reliable. The design also adds an elastic ring for isolating vibration and stabilizing rotation, reduces the vibration problem of pipeline operation, and further improves the long-term stability and safety of the pipeline connection. The pipe fitting provides a new mechanical connection structure for pipelines, which is simple and practical in design, more convenient to install, and has market promotion value.

As shown in the preferred embodiment 2 of FIG3 , the embodiment 2 is substantially the same as the embodiment 1, but the structure is different due to the different materials of the connected pipes. A mechanical snap-fit pipe fitting is applied to copper pipes, comprising a pipe fitting body 1, a locking thread 10 is provided on the pipe fitting body 1, and a locking connection cap 2 matched with the locking thread 10, the pipe fitting body 1 has a higher hardness than the connected pipe 3; the locking thread 10 extends from the front section to form a coaxial and integral snap-fit part 11, the snap-fit part 11 has an arched cross section, the front end outer diameter is an inner bevel structure 12, the front end inner side is provided with a triangular snap-fit tooth 13, and the rear end of the snap-fit tooth 13 is also provided with a compression cavity part 14; the rear end of the snap-fit part 11 is an inner circular hole 15 matched with the outer diameter of the pipe 3; the inner side of the locking connection cap 2 is provided with a bevel 20 that is pushed and matched with the inner bevel structure 12. The pipe fitting of the embodiment is connected to the copper pipe.

The buckle part 11 has guiding and distance properties in the design structure. Through the overall structure of the buckle part 11 and the cooperation between the compression cavity part 14, the inner bevel structure 12 and the bevel 20, the latch tooth 13 penetrates into the outer wall of the pipe 3, and the rear part arches upward to guide deformation; the rear end limiting surface 23 of the internal thread 21 of the locking connection cap 2 cooperates with the front end surface 18 of the locking thread 10 to realize the tightening distance limitation, prevent the buckle part 11 from being deformed too small or too large, and achieve the best deformation effect.

The latch teeth 13 are squeezed by the inclined surface 20 of the locking connection cap 2 and penetrate into the outer wall of the pipe 3 to form a sealing and anti-pulling node. An elastic ring 4 for isolating vibration and stabilizing rotation is also provided in the groove 21 inside the front end of the inclined surface 20 of the locking connection cap 2. The elastic ring 4 is made of rubber or plastic material and is tightly attached to the outer wall of the pipe 3. The elastic ring 4 does not have a sealing effect.

The inner side of the locking thread 10 is also provided with a sealing groove 16, and a sealing ring 17 is provided in the sealing groove 16. The sealing ring 17 and the latch teeth 13 play a multiple sealing effect to improve the safety of the connection. The sealing ring 17 is a U-shaped rubber ring that can effectively block the medium flowing out of the interior.

Claims (7)

1. A mechanical snap-fit pipe fitting, applied to copper pipes and flexible pipes, comprising a pipe fitting body (1), a locking thread (10) being provided on the pipe fitting body (1), and a locking connection cap (2) matching the locking thread (10), characterized in that: the pipe fitting body (1) has a higher hardness than the pipe (3) connected; a coaxial and integral snap-fit part (11) is extended from the front section of the locking thread (10); the snap-fit part (11) has an arched cross section, the front end outer diameter is an inner bevel structure (12), the front end inner side has a triangular snap-fitting tooth (13), and the rear end of the snap-fitting tooth (13) is also provided with a compression cavity part (14); the snap-fitting part (11) The rear end is an inner circular hole (15) that matches the outer diameter of the pipe (3); the inner side of the locking connection cap (2) is provided with a bevel (20) that is pushed and matched with the inner bevel structure (12); the latching tooth (13) is a complete annular structure; an elastic ring (4) for isolating vibration and stabilizing rotation is also provided in the groove (21) on the inner side of the front end of the bevel (20) of the locking connection cap (2), and the elastic ring (4) has viscoelastic high damping characteristics and is tightly attached to the outer wall of the pipe (3) after installation. 2. A mechanical snap-fit pipe fitting according to claim 1, characterized in that: the snap teeth (13) are squeezed by the inclined surface (20) of the locking connection cap (2) to pierce the outer wall of the pipe (3) to form a sealing and anti-pullout node. 3. A mechanical snap-fit pipe fitting according to claim 1, characterized in that a sealing groove (16) is provided inside the locking thread (10), and a sealing ring (17) is provided inside the sealing groove (16). 4. A mechanical snap-fit pipe fitting according to claim 1, characterized in that: the snap-fit teeth (13) are provided with two or more to form a multiple sealing structure. 5. A mechanical snap-fit pipe fitting according to any one of claims 1 to 4, characterized in that it also includes an inner tube support (5) installed at the end of the pipe (3) and extending to the position of the locking teeth (13). 6. A mechanical snap-fit pipe fitting according to claim 1, characterized in that the elastic ring (4) is made of rubber or plastic material and is tightly attached to the outer wall of the pipe (3). 7. A mechanical snap-fit pipe fitting according to claim 3, characterized in that the sealing ring (17) is a U-shaped rubber ring.