CN215950643U - Metal pipe joint - Google Patents

Abstract

The invention provides a metal pipe joint, which comprises an integrally arranged metal main body, wherein the metal main body sequentially comprises an internal connection section, a hard seal shrinkage section and a non-shrinkage section from the axial inner end to the outer end; the inscription section blocks the step including internal portion and pipe end, the tight section of hard seal crimple includes sealed crimple portion and first bulge loop firmly, first bulge loop sets up on the inner wall of the tight section of hard seal crimple, and its inner wall is cyclic annular protrusion state to its radial inboard, the non-crimple section includes non-crimple portion and annular groove, and the annular groove sets up on the inner wall of non-crimple section, and is cyclic annular recess state to its radial outside from its inner wall. In the invention, a soft and hard seal combination mode is adopted for the first time, wherein hard seal belongs to a riveting process between metal and metal, plastic filling is avoided, and the problem of hidden water leakage caused by aging of a plastic or rubber sealing ring is solved; wherein the soft sealing can further ensure the sealing stability of the product, thereby ensuring the safety of water.

Description

Metal pipe joint

Technical Field

The invention belongs to the field of pipeline connecting pieces, and particularly relates to a metal pipe joint for connecting metal pipelines.

Background

The existing metal fittings for connecting metal water pipes generally comprise two generations of products. In the first generation of joint products, the sealing structure for preventing water leakage is a rubber sealing ring, and belongs to a soft sealing structure. The sealing ring in the product is easy to age and damage, and easily releases toxin at high temperature, thus being not environment-friendly. The connection mode of the second generation joint product and the metal water pipe is clamping and pressing type, compaction and sealing, and belongs to a hard sealing structure. The second generation product needs to be sealed by a raw material tape during installation, so that the use is inconvenient.

For example, chinese patent CN201921339260 provides a sealing connection structure of a pipe, which includes a connector arranged outside the pipe, the end of the connector is provided with a plurality of sealing rings at intervals, an inner annular surface of each sealing ring is provided with a pressure reducing inclined surface, and the inclination directions of the pressure reducing inclined surface and the pressure reducing inclined surface are kept consistent; a locking cap is arranged outside the connecting piece, and a clamp point convex ring for applying clamping force to hydraulic pressure is formed on the outer surface of the middle end part of the connecting piece; the locking cap is characterized in that a horn-shaped flaring structure is formed in one end of the locking cap, the pipe is located in the connecting piece in a preassembly state, an outer port of the flaring structure of the locking cap is in contact with the connecting piece, when the hydraulic pliers exert force and act on the locking cap and the pliers point convex ring at the same time, the connecting piece is extruded into the locking cap after passing through the flaring structure of the locking cap to form a connecting and sealing structure between the connecting piece and the pipe. The invention has high connection strength, good sealing effect and long service life; the whole connecting structure is stable, the machining procedures are few, the machining precision requirement is low, and the machining cost is greatly reduced.

However, the joint provided by the patent does not solve the problem that the joint needs to be sealed by using the raw material tape, and the joint still needs two persons to be installed smoothly. In addition, the pipe sealing connection structure provided in the patent includes a plurality of components arranged in a dispersed manner, which is also inconvenient in production and installation processes.

And chinese patent CN201320477581.9 discloses a stainless steel pipe connection joint, which includes double links, elbows and tees. This nonrust steel pipeline attach fitting, including public end nut, card key, sealing washer and female end nut, public end nut installs the one end at the pipeline, female end nut passes through on the internal thread of public end nut with public end nut threaded connection, public end nut inner wall with be equipped with between the pipeline card key with the sealing washer, be equipped with the delivery port on the public end nut. The utility model discloses a cooperation through public end nut and female end nut is connected, and card key fixed position, and the sealing washer is sealed for the junction sealing performance is good, and has better anticreep effect. The card key 3 in this patent is two semi-circular card keys, and the middle part of card key 3 is provided with dop 8, is provided with aperture 9 near the tip at pipeline 5, and the dop 8 of card key inserts in aperture 9. The sealing rings are three, namely two hard sealing rings 4 and one soft sealing ring 7, and the soft sealing ring 7 is positioned in the middle of the hard sealing ring 4.

The stainless steel pipe coupling provided in this patent also includes a plurality of components arranged in a dispersed manner, and is completely sealed by a sealing ring.

Therefore, there is a need in the art to provide a new pipe joint and a new connecting method to solve the above problems.

Disclosure of Invention

Therefore, the invention provides a metal pipe joint, which comprises an integrally arranged metal main body, wherein the metal main body sequentially comprises an internal connection section (1), a hard sealing shrinkage section (2) and a non-shrinkage section (3) from the axial inner end to the outer end; the inner connecting section (1) comprises an inner connecting part (11) and a pipe end blocking step (12) for blocking the axial end part of the metal pipeline, the hard sealing and tightening section (2) comprises a hard sealing and tightening part (21) which is a cylindrical outer wall and a first convex ring (22), the first convex ring (22) is arranged on the inner wall of the hard sealing and tightening section (2) and protrudes annularly from the inner wall of the hard sealing and tightening section (2) to the radial inner side of the hard sealing and tightening section, the non-tightening section (3) comprises a non-tightening part (31) and an annular groove (32), and the annular groove (32) is arranged on the inner wall of the non-tightening section (3) and is recessed annularly from the inner wall of the non-tightening section (3) to the radial outer side of the non-tightening section; the metal pipe joint comprises a metal body and a sealing ring (5) arranged in the annular groove (32).

In a specific embodiment, the metal main body further comprises a second convex ring (23), the second convex ring (23) is also arranged on the inner wall of the hard seal shrinkage section (2) and protrudes from the inner wall of the hard seal shrinkage section (2) to the radial inner side of the hard seal shrinkage section in an annular protruding mode, the first convex ring (22) and the second convex ring (23) are arranged in the axial direction of the pipe joint in a front-back mode, the first convex ring (22) is close to the inner end of the metal main body, and the second convex ring (23) is close to the outer end of the metal main body.

In a particular embodiment, the metal body further comprises an end-tightening section (4) arranged at an axially outer end of the non-tightening section (3), the end-tightening section (4) comprising an end-tightening portion (41) for providing a direct contact position for a tool applying a radial tightening force; the end part tightening section (4) forms a plurality of circumferentially dispersed end part tightening points (42) after the tool is applied with force and tightened.

In a specific embodiment, the sealing ring is a rubber O-ring.

In a specific embodiment, the outer diameters of the inscribed section (1), the hard seal shrinkage section (2) and the non-shrinkage section (3) are sequentially increased. By the arrangement, metal raw materials used by the pipe joint can be saved to the maximum extent under the condition of completely realizing the functions of the pipe joint.

In a specific implementation mode, the metal pipe connects for the internal thread to connect, the internal thread connects and is used for linking to each other with metal pipeline and tap, the internal thread connects including the metal main part that the integration set up, still including the internal thread main part that the integration set up among the metal main part, the internal thread main part with inscription section (1) and the equal coaxial setting of hard seal crimple section (2), the internal thread main part sets up the one end relative with hard seal crimple section (2) on inscription section (1), be provided with the internal thread on the internal thread main part, be used for the internal thread connects and tap links to each other.

In a specific implementation mode, the metal pipe connects for outer screwed joint, outer screwed joint is used for linking to each other with metal pipeline and tap, outer screwed joint is including the metal main part that the integration set up, still including the outer screwed body that the integration set up among the metal main part, outer screwed body with inscription section (1) and the equal coaxial setting of hard seal crimple section (2), outer screwed body sets up the one end relative with hard seal crimple section (2) on inscription section (1), be provided with the external screw thread on the outer screwed body, be used for outer screwed joint links to each other with tap.

The invention has at least the following beneficial effects:

1) the sealing effect is good: the pipe joint product disclosed by the invention is mainly sealed by hard sealing and assisted by soft sealing of the O-shaped ring, and a raw material belt is not required for joint filling in the installation process, so that the installation is more convenient, the sealing effect is better, and the product performance is stronger.

2) The pipe joint is light in weight and greatly saves the cost of raw materials.

3) During installation, the end part of the metal pipeline cannot fall off from the pipe joint, and the number of installation workers is saved.

4) Although the sealing ring is still used in the invention, the sealing ring only plays a role of backup and safety sealing, and the hard sealing contraction section is arranged at the axial inner end of the sealing ring, so the sealing ring is not contacted with water and air in general, and is not easy to age and damage.

In general, the invention adopts a soft and hard seal combination mode for the first time, wherein the hard seal belongs to a riveting process between metals, thereby avoiding plastic filling and solving the problem of hidden water leakage caused by aging of plastic or rubber sealing rings; wherein soft seal can ensure the product at first and further ensure the sealing stability of product when the deformation is bent in the transition, promotes the factor of safety of water pipe to the safety of guarantee water. And the soft seal can correspondingly save the labor amount for installing the joint.

Drawings

Fig. 1 is an external view of a pipe joint according to the present invention, which is a straight joint.

Fig. 2 is a schematic cross-sectional view of the pipe joint of fig. 1 according to the present invention.

Fig. 3 is an external view of the pipe joint shown in fig. 1 and 2 after the pipe joint is tightened using a tool.

Fig. 4 is a schematic cross-sectional view of the pipe joint shown in fig. 1 and 2 after the pipe joint has been tightened using a tool.

Fig. 5 is a schematic external view of another pipe joint according to the present invention, which is a straight-through joint.

Fig. 6 is a schematic cross-sectional view of the pipe joint shown in fig. 5 according to the present invention.

Fig. 7 is an external view of the pipe joint shown in fig. 5 and 6 after the pipe joint is tightened using a tool.

Fig. 8 is a schematic cross-sectional view of the pipe joint shown in fig. 5 and 6 after being tightened using a tool.

Fig. 9 is an external view of a pipe joint according to the present invention, which is an internally threaded joint.

Fig. 10 is a schematic cross-sectional view of the pipe joint shown in fig. 9 according to the present invention.

Fig. 11 is an external view schematically showing another pipe joint according to the present invention, which is an internally threaded joint.

Fig. 12 is a schematic cross-sectional view of the pipe joint of fig. 11 according to the present invention.

Fig. 13 is an external view of a pipe joint according to the present invention, which is an elbow joint.

Fig. 14 is a schematic cross-sectional view of the pipe joint shown in fig. 13 according to the present invention.

Fig. 15 is an external view of another pipe joint according to the present invention, which is an elbow joint.

Fig. 16 is a cross-sectional view of the pipe joint of fig. 15 according to the present invention.

Fig. 17 is an external view of a pipe joint according to the present invention, which is a three-way joint.

Fig. 18 is a schematic cross-sectional view of the pipe joint of fig. 17 according to the present invention.

Fig. 19 is an external view schematically showing another pipe joint according to the present invention, which is a three-way joint.

Fig. 20 is a cross-sectional view of the pipe joint of fig. 19 according to the present invention.

Detailed Description

As shown in fig. 1 to 20, the present invention specifically provides a metal pipe joint, the pipe joint is used for being connected with at least one metal pipeline, the pipe joint comprises an integrally arranged metal main body, the metal main body sequentially comprises an internal connection section (1), a hard seal shrinkage section (2) and a non-shrinkage section (3) from an axial inner end to an axial outer end, the metal pipeline is used for being inserted into the pipe joint from the outer end to the inner end of the metal main body of the pipe joint, and then a radial shrinkage force is applied by means of a tool so that the shrinkage section of the pipe joint is shrunk and locked on the outer wall of the metal pipeline from outside to inside in the radial direction; the inner connecting section (1) comprises an inner connecting part (11) with a cylindrical outer wall and a pipe end blocking step (12) for blocking the axial end part of the metal pipeline, the hard sealing and tightening section (2) comprises a hard sealing and tightening part (21) with a cylindrical outer wall and a first convex ring (22), the first convex ring (22) is arranged on the inner wall of the hard sealing and tightening section (2) and protrudes annularly from the inner wall of the hard sealing and tightening section (2) to the radial inner side of the hard sealing and tightening section, the non-tightening section (3) comprises a non-tightening part (31) with a cylindrical outer wall and an annular groove (32), the annular groove (32) is arranged on the inner wall of the non-tightening section (3) and is recessed annularly from the inner wall of the non-tightening section (3) to the radial outer side of the non-tightening section, and the annular groove (32) is used for accommodating a sealing ring (5); after a radial reducing force is applied to the pipe joint by means of a tool, the convex ring is used for radially and inwards pressing the convex ring on the outer wall of the metal pipeline to form a first defense line for connecting and sealing the pipe joint and the metal pipeline, and the sealing ring is used for forming a second defense line for connecting and sealing the pipe joint and the metal pipeline.

In a particular embodiment, the metal body further comprises an end-tightening section (4) arranged at an axially outer end of the non-tightening section (3), the end-tightening section (4) comprising an end-tightening portion (41) for providing a direct contact position for a tool applying a radial tightening force; the end part tightening section (4) forms a plurality of circumferentially dispersed end part tightening points (42) after the tool is applied with force and tightened. Specifically, in the connecting method, the tool wraps the hard seal tightening part (21) and the end tightening part (41) respectively, the tool provides radial tightening force for the hard seal tightening section (2) and the end tightening section (4) at the same time, and the outer diameter of the end tightening section (4) is smaller than or equal to that of the inner connecting section (1).

The pipe joint product arranged integrally can be thrown integrally before installation and cannot be scattered. Therefore, the transportation is more convenient, and the installation is also more convenient.

In the invention, the end part shrinking section 4 forms more than three hoop points which are uniformly dispersed in the circumferential direction after being shrunk by applying external force, and the shrinking section and the hoop points can prevent the metal pipeline from rotating or falling off in the axial direction.

In the present invention, the metal body of the pipe joint is formed by, for example, a metal casting method.

In the invention, the materials of the metal pipeline and the pipe joint can be selected from stainless steel, copper or cast iron freely.

The invention provides a third generation metal pipe joint product, which is connected with a metal water pipe without filling gaps with raw material tapes.

The invention has at least the following characteristics:

1) sealing the joint and the pipeline: the first seal is a hard seal, and in particular is one or two metal rings projecting inwardly from the radially inner side wall of the metal body, and if two metal rings are provided, the two metal rings are arranged one behind the other in the axial direction of the pipe joint. The second seal is a soft seal, in particular an O-ring arranged axially outward of the metal ring. Therefore, the O-shaped ring only plays a role of safety, and the O-shaped ring can not contact liquid in the pipeline generally, so that the service life of the O-shaped ring is greatly prolonged. The O-shaped ring has two other functions, one is that when the pipeline is bent by more than 30 degrees for installation, the original hard seal is easy to lose efficacy, and the O-shaped ring plays a main sealing effect. The other is that when the pipe joint is installed on the pipeline, the O-shaped ring has elasticity, the end part of the metal pipeline is inserted into the pipe joint to form friction with the O-shaped ring, and the metal pipeline can be effectively prevented from slipping out to fall out of the pipe joint, so that the pipe joint can be installed by only one worker. The existing pipe joint needs to be held by one person during installation, and the other person can operate a tool to assemble the joint.

2) The metal main body is integrally arranged, so that the total length of the pipe joint can be shorter, materials are saved, and the cost of raw materials is saved.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions and substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims (7)

1. The metal pipe joint is characterized by comprising an integrally arranged metal main body, wherein the metal main body sequentially comprises an internal connection section (1), a hard sealing shrinkage section (2) and a non-shrinkage section (3) from the axial inner end to the outer end; the inner connecting section (1) comprises an inner connecting part (11) and a pipe end blocking step (12) for blocking the axial end part of the metal pipeline, the hard sealing and tightening section (2) comprises a hard sealing and tightening part (21) which is a cylindrical outer wall and a first convex ring (22), the first convex ring (22) is arranged on the inner wall of the hard sealing and tightening section (2) and protrudes annularly from the inner wall of the hard sealing and tightening section (2) to the radial inner side of the hard sealing and tightening section, the non-tightening section (3) comprises a non-tightening part (31) and an annular groove (32), and the annular groove (32) is arranged on the inner wall of the non-tightening section (3) and is recessed annularly from the inner wall of the non-tightening section (3) to the radial outer side of the non-tightening section; the metal pipe joint comprises a metal body and a sealing ring (5) arranged in the annular groove (32).

2. The metal pipe joint according to claim 1, wherein the metal body further comprises a second bead (23), the second bead (23) is also provided on the inner wall of the hard seal reduction section (2) and projects annularly from the inner wall of the hard seal reduction section (2) to the radially inner side thereof, and the first bead (22) and the second bead (23) are arranged back and forth in the axial direction of the pipe joint, and the first bead (22) is located near the inner end of the metal body and the second bead (23) is located near the outer end of the metal body.

3. The metal pipe joint according to claim 1, wherein the metal body further comprises an end tightening section (4) provided at an axially outer end of the non-tightening section (3), the end tightening section (4) comprising an end tightening portion (41) for providing a direct contact position for a tool to apply a radial tightening force; the end part tightening section (4) forms a plurality of circumferentially dispersed end part tightening points (42) after the tool is applied with force and tightened.

4. The metal pipe joint according to claim 1, wherein the sealing ring is a rubber O-ring.

5. The metal pipe joint according to any one of claims 1 to 4, wherein the outer diameters of the inner joint section (1), the hard seal shrinkage section (2) and the non-shrinkage section (3) are sequentially increased.

6. The metal pipe joint according to any one of claims 1 to 4, wherein the metal pipe joint is an internal thread joint, the internal thread joint is used for being connected with a metal pipeline and a water faucet, the internal thread joint comprises an integrally arranged metal body, the integrally arranged internal thread body is further included in the metal body, the internal thread body is coaxially arranged with the internal connection section (1) and the hard sealing and shrinking section (2), the internal thread body is arranged at one end of the internal connection section (1) opposite to the hard sealing and shrinking section (2), and internal threads are arranged on the internal thread body and used for connecting the internal thread joint with the water faucet.

7. The metal pipe joint according to any one of claims 1 to 4, wherein the metal pipe joint is an outer screw joint, the outer screw joint is used for being connected with a metal pipeline and a water faucet, the outer screw joint comprises an integrally arranged metal body, the integrally arranged outer screw body is further included in the metal body, the outer screw body is coaxially arranged with the inner connecting section (1) and the hard sealing and shrinking section (2), the outer screw body is arranged at one end of the inner connecting section (1) opposite to the hard sealing and shrinking section (2), and an external thread is arranged on the outer screw body and used for connecting the outer screw joint with the water faucet.

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