CN213745456U

CN213745456U - Elbow joint

Info

Publication number: CN213745456U
Application number: CN202022593041.XU
Authority: CN
Inventors: 朱旭林
Original assignee: Hunan Tianli Ruijia New Material Technology Co ltd
Current assignee: Hunan Tianli Ruijia New Material Technology Co ltd
Priority date: 2020-11-11
Filing date: 2020-11-11
Publication date: 2021-07-20
Anticipated expiration: 2030-11-11

Abstract

The utility model provides an elbow joint, which comprises two metal joints, a metal joint main body and two metal wedging caps, wherein the joints and the joint main body are mutually connected; the integration is provided with the convex cyclic annular arch of axis direction that connects to the elbow on the radial inner wall of connector, the radial outside at the joint end of connector is established to the wedging cap cover, and the thickness of wedging cap is greater than the thickness of connector, during the elbow connects the installation, the application of force makes when the wedging cap connects two axial tip locks to the elbow respectively, cyclic annular protruding inside oppression is in on the outer wall of metal pipeline tip, form the elbow connects and metal pipeline's the connection and sealed first defence line. The product provided by the utility model has good sealing effect; the product is light, and the raw material cost is greatly saved; the wedging cap can not fall off before installation, and the installation is convenient.

Description

Elbow joint

Technical Field

The utility model belongs to the pipe connection spare field, concretely relates to an elbow joint that is used for linking to each other between the metal water pipe.

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 products need to be sealed by filling materials such as polytetrafluoroethylene and the like 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 utility model has high connecting 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 this patent does not solve the problem of caulking by ptfe and the joint still requires two people to install successfully.

Accordingly, there is a need in the art to provide a new pipe joint that addresses at least some of the above-mentioned problems.

SUMMERY OF THE UTILITY MODEL

Therefore, the utility model provides an elbow joint, which is used for connecting two metal pipelines, and comprises two metal connectors 2, a metal connector main body 3 and two metal wedge caps 4, wherein the connectors 2 and the connector main body 3 are connected with each other; the connector 2 comprises a joint end 21 close to the center of the elbow joint and a pipeline end 22 far away from the center of the elbow joint, the connector main body 3 comprises a center end 31 and two far-end ends 32, the center axes of the two far-end ends 32 of the connector main body 3 form an included angle of 10-170 degrees, and the two joint ends 21 and the two far-end ends 32 are arranged to be in one-to-one connection fit; the radial inner wall of the connector 2 is integrally provided with an annular bulge protruding towards the central axis direction of the elbow connector, the wedging cap 4 can be sleeved on the radial outer side of the joint end 21 of the connector 2, the thickness of the wedging cap 4 is larger than that of the connector 2, the outer wall of the connector 2 comprises at least one slope surface 23, the slope surface is a conical table surface which is close to the pipeline end 22 and has a large outer diameter and a small outer diameter and is close to the joint end 21, the inner wall of the wedging cap 4 is provided with an inclined tightening surface matched with the slope surface 23, and the inclined tightening surface is also a conical table surface which has a large inner diameter at one end and a small inner diameter at the other end; the ramp surfaces 23 and the tapered surfaces cooperate to smoothly slide the wedging cap 4 from the engagement end 21 to the pipe end 22 and cause the elbow fitting to lock the pipe at that end; when the elbow joint is installed and the wedging cap is respectively locked to two axial end parts of the elbow joint by force application, the annular bulge is inwards pressed on the outer wall of the end part of the metal pipeline to form a first defense line for connecting and sealing the elbow joint and the metal pipeline.

In a specific embodiment, the elbow joint further comprises two external O-rings 1, wherein the external O-rings 1 are used for connecting and sealing the elbow joint with a metal pipeline; in the axial direction of the elbow joint, the external O-shaped ring is arranged at the axial outer end of the annular bulge, namely the outer end of the annular bulge is arranged at the tail end of the elbow joint close to the two connectors, so that the connection between the elbow joint and the metal pipeline and the sealed second defense line are formed.

In one embodiment, the distal end 32 is threadably engaged with the engagement end 21, or the distal end is nested with the engagement end and is adapted for welding attachment thereto.

In a specific embodiment, the engagement end is a small diameter end of the outer diameter of the connector, the pipe end is a large diameter end of the outer diameter of the connector, the small diameter end includes a cylindrical outer diameter surface a1, the large diameter end includes a cylindrical outer diameter surface a2, and the connector ramp surface is disposed between the two cylindrical outer diameter surfaces.

In a specific embodiment, each connector comprises at least two annular protrusions on the inner wall, and the two annular protrusions are arranged in the axial direction of the elbow connector.

In one embodiment, the engagement end of the connector comprises internal or external threads and, correspondingly, the distal end of the connector body comprises external or internal threads.

In a specific embodiment, the pipe end of the coupling head is provided with a shoulder a24 for preventing the wedge cap from disengaging the elbow fitting from the axial end.

In a particular embodiment, the wedging cap is arranged to be slidable in the axial direction of the elbow fitting radially outside the connection head and fitting body when the elbow fitting is not installed.

In a particular embodiment, the elbow fitting further comprises a secondary seal 5 for connection and sealing of the internal components of the elbow fitting.

In a particular embodiment, the secondary seal is an inscribed O-ring.

In a specific embodiment, an included angle of 30-150 degrees is formed between central axes of two far-end ends of the joint main body; preferably, the joint main body is L-shaped as a whole, namely, an included angle of 90 degrees is formed between the central axes of the two far-center ends of the joint main body.

The utility model discloses following beneficial effect has at least:

1) the sealing effect is good: the utility model discloses a sealed use hard seal of elbow joint product is leading to the soft seal of O type circle is for assisting, need not use polytetrafluoroethylene to joint in the installation, and it is more convenient to install, and sealed effect is better, and product property ability is stronger simultaneously.

2) The product is light, and the raw material cost is greatly saved.

3) The wedging cap can not fall off before installation, and the installation is convenient.

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

In general, the utility model adopts the mode of combining soft and hard seals for the first time, wherein the hard seal belongs to the riveting process between metals, the plastic filling is stopped, and the problem of hidden water leakage caused by aging of plastic or rubber sealing rings is solved; 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. Furthermore, the utility model discloses well sealed direction of hard has special, makes the utility model discloses well pipe joint's raw and other materials quantity reduces.

Drawings

Fig. 1 is a perspective view of the disassembled structure of the elbow joint of the present invention.

Fig. 2 is a side view of the elbow joint before installation structure of the present invention.

Fig. 3 is a sectional view of the elbow joint before installation of the structure of the present invention.

Fig. 4 is a perspective view of the structure of the elbow joint before installation.

In the figure: 1. the sealing device comprises an external O-shaped ring 2, a connector 3, a connector main body 4, a wedging cap 5 and an auxiliary sealing element.

Detailed Description

As shown in fig. 1 to 4, the utility model provides an elbow joint, which comprises two metal connectors, a metal joint main body and two metal wedging caps, wherein the connectors and the joint main body are connected with each other; the connector comprises a joint end close to the center of the elbow joint and a pipeline end far away from the center of the elbow joint, the joint main body comprises a center end and two far-ends, the center end is located at the center of the elbow joint, an included angle of 10-170 degrees is formed between the central axes of the two far-ends of the joint main body, and the two joint ends and the two far-ends are arranged to be connected and matched one by one; the pipe joint comprises a pipe joint, a connector and a wedging cap, wherein an annular bulge protruding towards the central axis direction of the elbow joint is integrally arranged on the radial inner wall of the connector, the wedging cap can be sleeved on the radial outer side of the joint end of the connector, the thickness of the wedging cap is larger than that of the connector, the outer wall of the connector comprises at least one slope surface, the slope surface is a conical table top with a large outer diameter close to a pipe end and a small outer diameter close to the joint end, an inclined tightening surface matched with the slope surface is arranged on the inner wall of the wedging cap, and the inclined tightening surface is a conical table top with a large inner diameter at one end and a small inner diameter at the other end; the slope surface and the inclined tightening surface are matched for the wedge-tightening cap to smoothly slide from the joint end to the pipeline end and enable the elbow joint to lock the pipeline at the end; when the elbow joint is installed and the wedging cap is respectively locked to two axial end parts of the elbow joint by force application, the annular bulge is inwards pressed on the outer wall of the end part of the metal pipeline to form a first defense line for connecting and sealing the elbow joint and the metal pipeline.

Before the elbow connects the installation, the elbow among the prior art connects the condition that has the wedging cap to break away from the elbow and connect, the utility model discloses in the diameter through design cylindrical external diameter surface A2 be greater than cylindrical external diameter surface A1's diameter to and keep off the shoulder through further design, make the wedging cap in the transportation keep being located the axial middle part that the elbow connects, thereby just solved the wedging cap from the design and drop roll-off to the outer problem of elbow joint. The elbow joint product of the utility model can be thrown wholly before installation, and can not be scattered. Therefore, the transportation is more convenient, and the installation is also more convenient.

The utility model discloses in, the material of metal pipeline and metal joint all can the free choice stainless steel, copper or cast iron.

The utility model discloses in, sealing connection between the inside component of elbow joint is except relying on threaded connection between connector and joint main part can also glue on the external screw thread of connector or joint main part when the elbow joint installation, has twisted the connector again during the installation and has connected the main part and can make and connect the inside seal and not leak. Of course, instead of applying glue, auxiliary seals or a welded connection after the shrink fit can be used.

The utility model provides a third generation metal joint product, it no longer need use polytetrafluoroethylene when being connected with metal water pipe.

The utility model discloses possess following difference with patent CN 20192133929260 at least: the utility model provides a wedging cap 4 sets up the axial middle part position that connects at the elbow, and it is located connector 2 and the centre that connects main part 3 in the axial. That is to say, the wedging cap 4 of the present invention is arranged axially inside, while the locking cap 1 of patent CN201921339260 is arranged at the axial end of the joint. Secondly, because the structures of the two pipe joints are different, the two pipe joints are different in installation mode when being installed. In particular, patent CN201921339260 is a device in which the locking cap 3 is moved in the axial direction gradually closer to the axial center point of the joint, pressing the connector 2 and locking the pipe. The wedging cap 4 of the utility model moves away from the central point of the elbow joint gradually in the axial direction to extrude the connector 2, thereby locking the pipe.

Furthermore, the utility model discloses possess following characteristics at least:

1) sealing the joint and the pipeline: the first seal is a hard seal, and specifically, two metal rings are protruded inwards from the radial inner side wall of the connector, and the two metal rings are arranged in the axial direction of the connector. The second seal is a soft seal, in particular to an O-ring arranged on the outer side of the joint of the metal ring in the axial direction, namely the external O-ring. Therefore, the external O-shaped ring only plays a role of safety, and generally cannot contact liquid in the pipeline, so that the service life of the external O-shaped ring is greatly prolonged. The external O-shaped ring has other two functions, one function is that when the pipeline is bent within 30 degrees for installation, the original hard seal is easy to lose efficacy, and the external O-shaped ring plays a main sealing effect at the moment. Another is when erection joint on the pipeline, external O type circle possesses elasticity, and the pipeline tip inserts and connects in and forms the friction between the O type circle, can effectively prevent the pipeline roll-off and drop to outside the joint, consequently the utility model provides an elbow connects only needs a workman can accomplish the installation.

2) The structure of the joint determines different mounting modes: in the prior art, the connection mode of the joint and the metal pipeline is pushed from the axial end position of the joint to the axial center position of the joint, for example, the installation mode in patent CN 201921339260. And the utility model discloses well joint and metal pipeline's connected mode puts to drawing to the axial both ends position that connects for the central point from the joint, specifically is that the use tool draws wedging cap 4, the utility model provides an operating means makes the installation that connects more light reliable. Specifically, the locking cap in the prior art joint needs to be guided by using a mounting tool, while the wedging cap in the utility model is guided by the internal structure of the joint, specifically by the external wall surface of the joint; in addition, the use of external O type circle, therefore the utility model discloses a joint only needs the operation alone to accomplish when the installation. When the existing pipeline joint is installed, one person needs to hold the pipeline joint by hand, and the other person operates a tool to assemble the joint.

3) Product structure and mounting means's difference makes the total length that the elbow connects can be shorter, material saving: because the change of mounting means, the axial is changed by interior to interior by exterior during the installation, under the same slip stroke condition of two kinds of products, the utility model discloses an elbow connects the product and can be shorter. For example, the same application and same thickness of elbow joint product can reduce the total weight of DN20 elbow joint by about 25% because the axial dimension of the joint is shortened. That is to say, the utility model provides a joint product can show and practice thrift raw and other materials cost under the prerequisite that does not sacrifice any product performance.

The foregoing is a more detailed description of the invention, taken in conjunction with the specific preferred embodiments, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions and replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims

1. An elbow joint is characterized in that the elbow joint is used for connecting two metal pipelines, the elbow joint comprises two metal connectors (2), a metal joint main body (3) and two metal wedging caps (4), and the connectors (2) and the joint main body (3) are connected with each other; the connector (2) comprises a joint end (21) close to the central position of the elbow joint and a pipeline end (22) far away from the central position of the elbow joint, the joint main body (3) comprises a central end (31) and two far-end ends (32) which are located at the central position of the elbow joint, an included angle of 10-170 degrees is formed between the central axes of the two far-end ends (32) of the joint main body (3), and the two joint ends (21) and the two far-end ends (32) are arranged in one-to-one connection fit; the pipe joint comprises a pipe joint (2), and is characterized in that an annular bulge protruding towards the central axis direction of the elbow joint is integrally arranged on the radial inner wall of the joint (2), the wedging cap (4) can be sleeved on the radial outer side of the joint end (21) of the joint (2), the thickness of the wedging cap (4) is larger than that of the joint (2), the outer wall of the joint (2) comprises at least one slope surface (23), the slope surface is a conical table top with a large outer diameter close to a pipe end (22) and a small outer diameter close to the joint end (21), the inner wall of the wedging cap (4) is provided with an oblique tightening surface matched with the slope surface (23), and the oblique tightening surface is also a conical table top with a large inner diameter at one end and a small inner diameter at the other end; the slope surface (23) and the inclined tightening surface are matched for the wedge cap (4) to smoothly slide from the joint end (21) to the pipeline end (22) and enable the elbow joint to lock the pipeline at the end; when the elbow joint is installed and the wedging cap is respectively locked to two axial end parts of the elbow joint by force application, the annular bulge is inwards pressed on the outer wall of the end part of the metal pipeline to form a first defense line for connecting and sealing the elbow joint and the metal pipeline.

2. The elbow connection according to claim 1, characterized in that it further comprises two external O-rings (1), said external O-rings (1) being used for the connection and sealing of the elbow connection to a metal pipe; in the axial direction of the elbow joint, the external O-shaped ring (1) is arranged at the axial outer end of the annular bulge, namely the outer end of the annular bulge is arranged at the tail end of the elbow joint close to the two connectors (2), so that a second defense line for connecting and sealing the elbow joint and the metal pipeline is formed.

3. The elbow joint according to claim 1, characterized in that the distal end (32) is threadedly engaged with the engagement end (21) or the distal end (32) is nested with the engagement end (21) and is adapted for welding fixation thereto.

4. The elbow joint according to claim 1, wherein the engagement end (21) is a small diameter end of the outer diameter of the connector (2), the conduit end (22) is a large diameter end of the outer diameter of the connector (2), the small diameter end comprising a cylindrical outer diameter surface a1, the large diameter end comprising a cylindrical outer diameter surface a2, and the ramp surface (23) being disposed between the two cylindrical outer diameter surfaces.

5. Elbow joint according to claim 1, characterized in that the inner wall of each connection head (2) comprises at least two annular projections, which are arranged one behind the other in the axial direction of the elbow joint.

6. Elbow joint according to any of claims 1-3, characterized in that the pipe end (22) of the joining head (2) is provided with a shoulder A (24) for preventing the wedging cap (4) from coming off the elbow joint from the axial end.

7. The elbow joint according to any one of claims 1-3, characterized in that the elbow joint further comprises an auxiliary seal (5), the auxiliary seal (5) being used for connection and sealing of the elbow joint internal components.

8. The elbow joint according to claim 7, characterized in that the supplementary seal (5) is an inscribed O-ring.

9. The elbow joint according to any one of claims 1-3, characterized in that the joint body (3) is L-shaped as a whole, i.e. the central axes of the two distal ends (32) of the joint body (3) form an angle of 90 °.