WO2022198453A1

WO2022198453A1 - Composite squeezable gear ring and compression fitting applying same

Info

Publication number: WO2022198453A1
Application number: PCT/CN2021/082451
Authority: WO
Inventors: 徐忠锐; 孙敬伦; 夏传荣; 任艳青; 李波
Original assignee: 玫德集团有限公司
Priority date: 2021-03-23
Filing date: 2021-03-23
Publication date: 2022-09-29

Abstract

Disclosed is a composite squeezable gear ring (9) for use in a compression fitting. The gear ring is provided with an internal gear ring (5) and a flexible cladding layer (8). The flexible cladding layer (8) completely or partly covers the exterior of the internal gear ring. The flexible cladding layer (8) covering the exterior of the internal gear ring is distributed on the exterior of the internal gear ring (5). The structure of the flexible cladding layer (8) covering the exterior of the internal gear ring is one or many of the gear ring being a fully rubber-wrapped composite, the outer ring surface of the gear ring being a rubber-wrapping-free composite, the inner ring surface of the gear ring being a rubber-wrapped composite (83), or the lateral surface of the gear ring being a rubber-wrapped composite (82). The composite squeezable gear ring is formed by compounding a rigid flexible metal material and a flexible plastic material. Such structure solves the problem of a gear ring for use in a compression fitting being prone to corrosion, premature failure, and a short service life, thereby resulting in reduced fitting pulling force.

Description

A compound extrudable gear ring and a compression pipe fitting using the same

technical field

The invention relates to a composite extrudable toothed ring, which is suitable for the sealing and clamping type connection of metal pipes.

Background technique

At present, when transporting fluid media remotely, especially in the transport of chemicals, fuels, and gases including water, oil, and natural gas, it is necessary to seal and mechanically connect the ends of pipes to form a pipeline system. In the pipeline connection technology, the extrusion of the metal pipe is called a press connection, or a mechanical socket-press-fit interface connection, which can better maintain the durability of the connection seal.

Up to now, the toothed ring used for press connection, including the solution of using the fitting pressure port section to reduce the wall thickness locally at the press part, this structure is the mainstream method of the press connection technology at present. However, at present, more than 99% of the applications of this connection method in the prior art are gear ring structures with exposed metal surfaces. This is because the all-metal gear ring is easy to use and the production process is simple.

However, this all-metal gear ring connection technology has many problems in the compression connection. On the one hand, since metal materials are prone to metal corrosion due to the action of the surrounding fluid medium, the toothed ring tends to corrode during long-term use, resulting in a significant reduction in its strength; at the same time, the toothed ring is subjected to vibration stress during the extrusion process. The teeth are damaged, causing the connection between the compression fittings and the pipeline to be continuous and not tight. Therefore, the all-metal toothed ring connection will gradually fail or reduce the pulling force during use. Therefore, the stability of the pipeline, especially the thermal expansion. The thermal stress stability of cold shrinkage has a very adverse effect, causing leakage and reducing the service life of pipes and fittings.

On the other hand, because the pure metal toothed ring has a sharp edge, it will cause certain damage to the thinned and thick socket extrusion area during the extrusion process of the press connection, and damage the metal surface of the socket extrusion area, such as stainless steel. The passivation film makes the fluid medium directly contact the metal at the socket, accelerates the corrosion rate of the fluid medium at the socket, and significantly reduces the service life of the pipe fittings.

In addition, during the extrusion process of the pipe fittings with toothed ring teeth, the obvious defect is that the toothed ring teeth provided at the extrusion part to resist pulling will cause cutting damage to the sealing material, which causes the external environmental medium to reach the extrusion area. In addition, the local area damaged by the extrusion zone is prematurely eroded. The existing common structure lacks protection of the damaged part, which will lead to the problem of local corrosion of the metal pipe in advance.

The applicant has found that the compression ring used in the prior art is the main structure for providing the pulling force, and is also the main structure for the above problems. Considering optimization and retaining the original function, the above can be solved. question.

The present invention provides a precedent for the use of a composite extrudable toothed ring in the compression connection. The metal toothed ring is compounded with an elastic plastic to form a composite extrudable toothed ring for the compression connection technology. It can improve the anti-corrosion ability and reduce the damage to the socket extrusion area.

Based on the industrial requirements for cost reduction, the composite extrudable gear ring can use the sealing properties of plastic to play an auxiliary sealing role after composite molding with plastic. The ring gear is integrally formed and becomes a whole.

Therefore, based on the above research, the applicant provides a new structure of a composite extrudable toothed ring in a press-fit connection. At the same time, the composite extrudable toothed ring also has problems in use, such as difficult positioning and reduced sealing performance. , the applicant has carried out a series of optimizations on the structure of the compound extrudable toothed ring, thereby overcoming the above-mentioned problems existing in the prior art.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a composite extrudable toothed ring, which can be used for the sealing and pressing connection of metal pipes. Reduce the leakage rate of the press-fit connection, and buffer the damage to the socket extrusion area through the plastic structure in the composite structure, and offset or buffer the micro-rebound easy loosening caused by temperature, vibration or other principles through the elastic characteristics of the plastic problems, improve the thermal expansion and contraction stability of the pipeline, prevent the connection from loosening, prolong the service life and prevent erosion.

The present invention provides the following technical solutions:

In a first aspect, the present invention provides a composite extrudable toothed ring for a crimped pipe, having an inner toothed ring and an elastic cladding layer fully or partially covering the outside of the inner toothed ring .

The inner gear ring is an integral split ring with continuous circumference, and the integral split ring has a gear ring opening.

The elastic cladding layer is a continuous integral closed ring supported on the inner gear ring, and the elastic cladding layer is configured to accommodate the compression of the elastic cladding layer at the position of the gear ring opening on the inner gear ring. space for post-deformation; preferably, the elastic coating layer is thinned at the opening of the gear ring; preferably, the elastic coating layer is provided with a groove at the opening of the gear ring.

The inner gear ring is a hard elastic metal gear ring, preferably an elastic steel gear ring; the elastic coating layer is made of an elastic plastic material, preferably an elastic rubber material; preferably, the composite extrudable gear ring is made of elastic steel The toothed ring and the elastic plastic material are compounded; the elastic coating layer is composed of one or more layers of elastic plastic material.

Further, the present invention provides a composite extrudable toothed ring for a compression-type pipe, which has an inner toothed ring and an elastic coating layer; the elastic coating layer covers the outside of the inner toothed ring. It is one or more of the complete rubber-coated composite of the toothed ring, the non-coated composite of the outer ring of the toothed ring, the coated composite of the inner ring of the toothed ring, or the side-coated composite of the toothed ring;

According to a preferred embodiment of the present invention, four kinds of composite structures of internal toothed rings and plastic are also disclosed. These four composite structures of internal gear ring and plastic can realize different protection for different positions of the gear ring, and then realize the protection of the inside of the compression socket area of the compression connection, the protection of different positions on the two sides, and the multi-pipe Surface protection; the above protection positions can be selected according to the application scenarios and working conditions.

The outer ring surface of the toothed ring is the outermost surface of the inner toothed ring on the outer surface of the inner toothed ring adjacent to the inner surface of the pipe or the outermost surface along the normal direction of the axis of the inner toothed ring;

The inner ring surface of the toothed ring is the inner surface of the inner toothed ring adjacent to the outer surface of the pipe installed in the pipe fitting or the innermost surface along the normal direction of the axis of the inner toothed ring;

The side surface of the toothed ring is the side surface of the inner toothed ring along the radial direction of the inner toothed ring or the direction in which the inner toothed ring is engraved into the pipe installed in the pipe fitting;

The fully encapsulated and compounded structure of the toothed ring is as follows: the inner toothed ring is completely wrapped by the elastic plastic material of the elastic coating layer, so that the inner toothed ring does not contact the external medium;

Preferably, the elastic coating layer forms a space along the inner surface of the inner ring surface of the toothed ring to accommodate the deformation of the elastic coating layer after being squeezed;

Preferably, the elastic coating layer is partially thinned along the inner surface of the inner ring surface of the toothed ring;

Preferably, the elastic coating layer is provided with grooves along the inner surface of the inner ring surface of the toothed ring;

The structure of the outer ring surface of the toothed ring without rubber coating is as follows: the outer ring surface of the toothed ring is directly exposed without being covered by the elastic plastic material of the elastic coating layer; the outer ring surface of the toothed ring is in use. Contact with the pipe fitting and fit on the inner wall of the pipe fitting;

The composite structure of the inner ring of the toothed ring with rubber is as follows: the inner surface of the toothed ring is completely or partially wrapped in the elastic plastic material of the elastic coating layer, so that before the inner toothed ring and the fitting surface of the pipe are squeezed, the The teeth of the inner tooth ring engraved into the outer wall of the pipe are all sealed and wrapped in elastic plastic material;

Preferably, the elastic wrapping layer that completely wraps the inner annular surface of the toothed ring forms a space for accommodating the deformation of the elastic wrapping layer after being squeezed along the circumference of the inner annular surface of the toothed ring;

The structure of the side surface of the gear ring is as follows: the side of the inner gear ring is completely or partially covered with rubber, so that when the inner gear ring and the fitting surface of the pipe installed in the pipe are extruded, the inner ring is squeezed. The part between the toothed ring carved into the outer surface of the pipe and the outer surface of the pipe is completely covered and sealed by elastic plastic.

Preferably, the structure of the elastic coating layer covering the outside of the inner gear ring is that the outer ring surface of the gear ring is not covered with glue, while the inner ring of the gear ring is covered with glue and the side of the tooth ring is covered with glue;

Preferably, the structure of the elastic coating layer covering the outside of the inner tooth ring is that the outer ring surface of the tooth ring is not covered with glue and only the inner ring of the tooth ring is covered with glue;

Preferably, the structure of the elastic coating layer covering the outside of the inner gear ring is that only the side of the gear ring is rubber-coated and compounded; preferably, the outer ring surface of the gear ring and the inner ring surface of the gear ring are bare metal surfaces;

Preferably, the structure of the elastic coating layer covering the outside of the inner gear ring is that only the outer ring surface of the gear ring and the inner ring surface of the gear ring are exposed metal surfaces, and the rest of the surfaces are covered by the elastic coating layer;

Preferably, the elastic plastic material is a rubber elastomer with good water-air tightness;

Preferably, the elastic plastic material evenly covers the outside of the inner gear ring along the circumference of the pipe in the radial direction;

Further, the elastic plastic and the inner toothed ring are firmly attached by the composite coupling agent.

Further, the inner toothed ring is an elastic steel toothed ring made of metal.

Preferably, the compound extrudable toothed ring is formed by compounding the inner toothed ring and elastic plastic material.

Preferably, the toothed ring structure in the composite extrudable toothed ring uses an elastic steel toothed ring, preferably the elastic steel toothed ring is prepared by a stamping process, and stamped into different tooth structures according to requirements.

In a preferred technical solution of the present invention, there is also provided a composite extrudable toothed ring for a compression-type pipe, which has an inner toothed ring and an elastic coating layer, the inner toothed ring including an annular continuous portion and an inner toothed ring. A plurality of blade teeth uniformly arranged along the circumference of the annular continuous portion, preferably, each blade tooth is directed towards the direction of the metal pipe body and is radially symmetrical with respect to a radial plane of the annular continuous portion;

The elastic coating layer is not coated on the surface of the annular continuous part;

Preferably, the surface of the annular connecting portion is a bare metal surface.

The present invention also provides a composite extrudable toothed ring for a compression-type pipe, which has an inner toothed ring and an elastic coating layer, the inner toothed ring includes an annular continuous part, and the annular continuous part is one An integral split ring with an oblique opening, a plurality of cut-off openings are symmetrically distributed along the annular continuous part, and a plurality of arc-shaped long rings are evenly distributed between the cut-off openings, wherein each arc-shaped long ring points to the direction of the metal tube and is opposite to each other. It is U-shaped radially symmetrical to a radial plane of the annular continuous part;

In another aspect, the present invention provides a compression-type pipe fitting using a compound extrudable toothed ring, which has an extrusion socket, an intubation socket and a pipe end stop, and the pipe wall in the extrusion socket section is The thickness is not greater than the wall thickness of the socket section of the pipe fitting and the limit section of the pipe end.

Preferably, the wall thickness of the tube in the extrusion socket section is smaller than the wall thickness of the tube insert socket section and the tube end stop section.

Further, the crimping type pipe fitting includes a port inwardly wound ring, which is provided on the crimping type pipe fitting and is used for positioning or dividing the compound extrudable toothed ring to protrude, and the port inwardly wound ring and the extrusion socket. and a cannula socket connected to the extruded socket; at least one composite extrudable toothed ring and a sealing member made of composite materials are arranged in the inner rolled ring of the pipe fitting port;

Preferably, the composite extrudable gear ring and the seal are made into an integral gear ring composite self-sealing rubber ring;

Preferably, the inner gear ring is made of metal material;

Preferably, the sealing member is a special-shaped annular sealing member or an O-ring-shaped sealing member provided with a water stop ring.

Another technical solution provided by the present invention is a composite extrudable gear ring for a compression-type pipe, which has an inner gear ring, an elastic coating layer covering the outside of the inner gear ring, and a seal that is pre-assembled s component.

Preferably, the pipe fitting includes an extrusion socket connected with the inner wrap ring of the port, and an intubation socket connected with the extrusion socket; the thickness of the pipe wall of the extrusion socket is not greater than that of other parts of the pipe fitting wall.

Preferably, the inner toothed ring is a squeezed stop toothed ring, and the toothed ring has at least one blade tooth; the inner toothed ring is installed in the extrusion socket. The sealing wrapping/protecting layer of the metal tube is engraved into the wall of the metal tube to ensure the axial fixation of the extrusion connection and prevent the tube end from being pulled out; while the elastic plastic and pierced sealing material coated on the outside of the inner gear ring are Under the radial pressure, all new extrusion seals are formed to the damaged part at the same time; the combination of the above features can protect the interface, avoid the corrosion of the external environment, increase the safety and prolong the service life.

In a preferred technical solution, the inner toothed ring includes an annular continuous portion and a plurality of blade teeth uniformly arranged along the circumference of the annular continuous portion, wherein each blade tooth is directed towards the direction of the metal pipe body and is opposite to the metal pipe body. A radial plane of the annular continuous portion is symmetrical with the radial direction;

In another preferred technical solution, the inner toothed ring includes an annular continuous portion, and the annular continuous portion is a whole ring with an oblique opening;

Preferably, a plurality of cut openings are evenly distributed along the annular continuous portion, and a plurality of arc-shaped long rings are evenly distributed between the cut-off openings, wherein each arc-shaped long ring points to the direction of the metal pipe body and is opposite to the ring One radial plane of the continuous portion is radially symmetrical and U-shaped.

Preferably, each arc-shaped long ring is designed with a plurality of blades protruding radially;

Preferably, each arc-shaped long ring is designed with directional cutting teeth carved into the pipe wall or the root of the annular cutting edge or inclined at a certain angle relative to the radial direction; preferably, the angle is inclined relative to the radial direction by 10-20 degrees ; Preferably, the angle of inclination of the blade teeth relative to the radial direction is equal to the inclination angle of the oblique opening of the annular continuous portion relative to the radial direction.

After the inner toothed ring is squeezed by the outer circumference, the blade teeth are embedded in the outer wall of the metal tube to obtain an elastic sealing protection state.

The blade-tooth structure is an equivalent-effect blade-tooth structure that can be embedded inside the outer wall of the metal tube under the pressure of radial contraction.

A preferred technical solution includes that the seal can be a seal with an O-ring or a special-shaped annular seal;

The special-shaped annular seal has a main body sealing ring part and a tail part between the main body sealing ring part and the pipe end limiting part, and the tail part comprises a self-sealing tail ring seal water stop ring;

Preferably, the special-shaped annular seal is not limited to the above-mentioned special-shaped structure, and may include structures with equivalent functions to improve sealing performance.

Another preferred technical solution includes that the extruded socket section is reduced in diameter and transitions to the adjacent cannula socket section, and then the diameter is reduced and transitioned to the limit position of the pipe section; there is an inwardly rolled ring at the pipe fitting socket section. stop.

Description of drawings

1 is a schematic diagram of a structure of the compound extrudable gear ring of the present invention;

2 is a top view of a structure of the composite extrudable toothed ring of the present invention;

Fig. 3 is the A-A sectional schematic diagram of a structure of the composite extrudable gear ring of the present invention;

FIG. 4 is a schematic perspective view of a structure of the composite extrudable gear ring of the present invention;

Fig. 5 is a top view of a structure of the compound extrudable toothed ring of the present invention after being squeezed and stressed;

6 is a schematic perspective view of a structure of the composite extrudable toothed ring of the present invention after being squeezed and subjected to force;

7 is a schematic diagram of another structure of the composite extrudable toothed ring of the present invention;

FIG. 8 is a schematic diagram of another structure of the composite extrudable toothed ring of the present invention after being squeezed and subjected to force;

9 is a top view of another structure of the composite extrudable toothed ring of the present invention after being squeezed and subjected to force;

10 is a schematic cross-sectional view A-A of another structure of the composite extrudable toothed ring of the present invention after being squeezed and stressed;

11 is a schematic cross-sectional view of the composite extrudable toothed ring of the present invention when the front cannula is extruded in the compression-type pipe fitting;

12 is a schematic cross-sectional view of the composite extrudable toothed ring of the present invention after intubation and extrusion in the compression-type pipe fitting;

Fig. 13 is a kind of structural schematic diagram of the open inner gear ring of the present invention;

14 is a schematic cross-sectional view of A-A of a structure of the open inner gear ring of the present invention;

Figure 15 is a bottom view of a structure of the open inner gear ring of the present invention;

16 is a schematic diagram of another structure of the open inner gear ring of the present invention;

Fig. 17 is the A-A sectional schematic diagram of another structure of the open inner gear ring of the present invention;

Figure 18 is a bottom view of another structure of the open inner gear ring of the present invention;

Figure 19 is a side view of another configuration of the open inner gear ring of the present invention;

Figure 20 is a schematic view of the open composite extrudable gear ring of the present invention;

Figure 21 is a side view of the split composite extrudable toothed ring of the present invention;

Figure 22 is a bottom view of the inner gear ring of the split compound extrudable gear ring of the present invention;

Figure 23 is a B-B cross-sectional schematic diagram of the inner gear ring of the open composite extrudable gear ring of the present invention;

Figure 24 is a schematic diagram of a structure of the special-shaped annular seal of the present invention;

25 is a schematic cross-sectional view of C-C of a structure of the special-shaped annular seal of the present invention;

26 is a schematic cross-sectional view of a toothed ring composite self-sealing rubber ring of a special-shaped annular seal structure of the present invention;

27 is a schematic cross-sectional view of a toothed ring composite self-sealing rubber ring of an O-ring-shaped seal structure according to the present invention;

Figure 28 is a schematic diagram of an open composite extrudable toothed ring of the present invention;

Figure 29 is a top view of an open composite extrudable gear ring of the present invention;

Figure 30 is a front view of an open composite extrudable gear ring of the present invention;

Figure 31 is a schematic cross-sectional view A-A of an open composite extrudable gear ring of the present invention;

Figure 32 is a schematic diagram of a closed compound extrudable toothed ring of the present invention;

Figure 33 is a top view of a closed compound extrudable toothed ring of the present invention;

Figure 34 is a front view of a closed compound extrudable toothed ring of the present invention;

Figure 35 is a schematic cross-sectional view of A-A of a closed compound extrudable toothed ring of the present invention;

Among them, 1. Extrusion socket; 2. Intubation socket; 3. Limiting part of pipe end; 4. Inner ring of pipe fitting port; 5. Internal gear ring; 6. Sealing part; 7. Metal pipe; 8 , elastic coating layer; 9, compound extrudable gear ring; 51, annular continuous part of the inner gear ring; 52, arc-shaped long ring of the inner gear ring; 53, the root of the tooth mouth of the inner gear ring; 54, The blade teeth of the inner gear ring carved into the pipe wall; 55. The embedded part of the inner gear ring protects the sealing part; 56. The gear ring opening part of the inner gear ring; 57. The cutting opening of the inner gear ring; part; 62, special-shaped annular seal; 63, O-ring seal; 81, compound extrudable gear ring opening; 82, the side of the gear ring is compounded by rubber; 83, the inner ring of the gear ring is compounded with glue; 84, The groove of the elastic coating layer at the opening of the gear ring of the inner gear ring; 85. The groove of the elastic coating layer at the position of the inner ring surface of the gear ring.

Detailed ways

The definition of the industry term "plastic" used in this application is defined as follows: "plastic material" in the present invention includes plastic material and rubber material.

Example

In order to better understand the above technical solutions, the above technical solutions will be described in detail below with reference to the accompanying drawings and specific embodiments, but the present invention is not limited to these specific embodiments.

As shown in FIG. 1-FIG. 6, a composite extrudable toothed ring 9 for a compression-type pipe according to a structure of the present invention has an inner toothed ring 5 and an elastic coating layer 8. The elastic coating layer 8 It is completely or partially encased outside the inner toothed ring 5 .

The inner gear ring is a hard elastic metal gear ring, preferably an elastic steel gear ring;

The elastic coating layer is made of elastic plastic material, preferably elastic rubber material;

Preferably, the compound extrudable toothed ring 9 is made by compounding the inner toothed ring and elastic plastic material;

The elastic coating layer is composed of one or more layers of elastic plastic material.

The inner toothed ring has an annular continuous portion 51 , which is not covered by the elastic plastic material. The annular continuous portion 51 is a bare metal surface, and symmetrically distributed uniformly distributed along the annular continuous portion 51 . A plurality of cut-off openings 57, the cut-off openings 57 are partially covered with elastic plastic material; the annular continuous portion 51 of the inner toothed ring 5 adjacent to the pipe is not covered with elastic plastic material, but the metal surface is directly exposed and exposed. It is directly attached to the inner wall of the pipe fitting. After the section 1 of the extrusion socket is extruded by external force, the fitting gap between the inner tooth ring and the inner wall of the pipe fitting can be reduced to form a tight fit, so the pressure can be directly transmitted to the pipe fitting. On the hard elastic toothed ring, the blade teeth are clamped into the outer wall of the metal pipe 7, and the pipe body is locked to prevent the metal pipe 7 and the pipe fittings from being pulled out.

The inner toothed ring is an integral open ring with continuous circumference, and the integral open ring has a toothed ring opening 56; the elastic coating layer 8 is a continuous integral closed ring supported on the inner toothed ring 5 , the elastic coating layer 8 has a groove 84 arranged on the inner ring surface of the composite extrudable toothed ring 9 at the position of the toothed ring opening 56 on the inner toothed ring, and is configured to accommodate the elastic coating layer 8 being squeezed. post-deformation space.

Further, it can be seen from FIGS. 5-6 that after the composite extrudable toothed ring 9 is extruded, the groove 84 is bent, and the resulting void volume is used to accommodate the deformation of the elastic coating layer 8 after being extruded. The annular shape of the main body of the composite extrudable toothed ring 9 is not affected.

In another embodiment, the elastic coating layer is thinned at the position of the gear ring opening on the inner gear ring.

In another embodiment of the present invention, in the composite extrudable toothed ring 9 for a compression-type pipe, the elastic coating layer 8 has a groove 84 at the position of the toothed ring opening 56 on the inner toothed ring , set on the outer ring surface of the compound extrudable gear ring 9, as shown in Figures 7-10.

The applicant found in the research that metal gear rings are generally used in the compression type pipe fittings in the prior art, and it is difficult to use elastic plastic materials for compounding with metal gear rings. ring, since the elastic plastic material covering the surface of the inner split ring produces a large elastic deformation after being squeezed, it cannot maintain the stable shape of the composite extrudable toothed ring, and hinders the position fixing effect of the toothed ring. Ordinary closed ring will cause the energy in the extrusion process of the pipe fittings to cause displacement, deformation and damage to the teeth of the inner tooth ring under the transmission of the elastic plastic material; on the other hand, the elastic plastic material is removed under the pressure of extrusion. The subsequent rebound effect will cause the pipe fittings to be subject to continuous stress and easily generate voids, resulting in the loosening of the pipe fittings and the instability of the seal.

In the present invention, through the selection of the rubber-covering position in the overall rubber-covering ring and the configuration of the deformation clearance, the structure of the composite extrudable toothed ring is stable during the extrusion process, and the pipe fittings directly touch the metal of the composite extrudable toothed ring. Extrusion force is applied to the exposed surface, reducing the fitting gap between the inner gear ring and the pipe fitting to form a tight fit, preventing the pipe and the fitting from being pulled out, and the deformation space at the opening can buffer the internal expansion of the elastic material during extrusion. Pressure, cooperation, offset or buffer the easy loosening problem caused by temperature, vibration or other principles, improve the thermal expansion and contraction stability of the pipeline, prevent the connection from loosening, prolong the service life and prevent erosion.

As shown in FIG. 11 , a schematic diagram of intubation before extrusion of a compression-type pipe fitting used for connection of metal pipes 7 according to an embodiment of the present invention has an extrusion socket 1 , an intubation socket 2 and a pipe end limiter 3 , the extrusion socket 1 is arranged on the side of the intubation socket 2 close to the pipe insertion hole; the thickness of the pipe fitting wall of the pressed metal pipe fitting in the extrusion socket 1 section is not greater than the pipe fitting intubation socket 2 section and The wall thickness of the 3 section of the pipe end limiter; the composite extrudable toothed ring of the present invention is located on the inner side of the inner ring 4 of the pipe fitting port, on one side of the seal, and the composite extrudable toothed ring of the present invention and the seal The adjacent side of the member 6 also serves to position or define the sealing member 6 to prevent the sealing member 6 from being moved under pressure.

As shown in Fig. 12, a schematic diagram of the pressed metal pipe fitting used for the connection of the metal pipe 7 in this embodiment is after extrusion. It can be seen that the U-shaped toothed ring teeth 64 are carved into the surface of the metal pipe 7, and the teeth can be squeezed. The elastic plastic on the surface and the special-shaped annular seal 62 with a water stop ring completely fill the gap in the extrusion area. The inner walls in the area of the mouth 2 are pressed and sealed; and the toothed ring teeth 64 are carved into the surface of the metal tube 7 to pierce the sealing coating/protective layer of the metal tube 7, and are carved into the wall of the metal tube 7 to ensure extrusion. The axial fixation of the connection prevents the pipe end from being pulled out; while the elastic coating 8 and the pierced sealing material on the outside of the inner gear ring simultaneously form a whole new insert protection for the damage under radial pressure The sealing part 55 is used to squeeze and seal the damaged part of the sealing wrapping layer/protective layer of the metal tube 7; because the elastic plastic material in the squeeze socket is completely filled with no gaps, the pressure at the squeezed part of the clamping piece is stable. , The cutting edge of the pressing gear ring is not loose, the fitting surface of the pressing metal pipe fitting and the metal pipe 7 is tight, and the sealing performance and stability are high.

In one embodiment, the compression-type metal pipe fitting for the metal pipe 7 includes a round tubular extruded socket 1, the diameter of which is reduced to transition to the adjacent intubation socket 2, and then the reduced diameter transitions to the limit position of the pipe section. The pipe fitting extrusion socket 1 is provided with an inwardly rolled ring stopper, and at least one composite extrudable toothed ring made of composite material and a sealing member 6 are arranged in the extrusion socket 1 . In order to facilitate the insertion of the end of the metal pipe 7 connecting the pipe, the diameter φ1 of the pipe socket adjacent to the extrusion socket 1 is inserted into the pipe socket, which is larger than the diameter φ2 of the intubation socket 2 at the leading part of the adjacent pipe end. When the pipe is inserted into the socket of the pipe fitting in place, a good and firm connection joint is formed after the outer ring of the extruded socket 1 is squeezed inwardly to shrink the mouth.

In a preferred embodiment of the present invention, as shown in FIG. 11 and FIG. 12 , the press-fit metal pipe fitting further includes a pipe fitting port inwardly wound ring 4 , and at least one composite A composite extrudable toothed ring and a seal 6 made of materials; preferably, the composite extruded toothed ring includes an inner toothed ring and an elastic coating layer 8 covering the outside of the inner toothed ring.

Preferably, the inner toothed ring is made of metal material; preferably, the inner toothed ring is a squeezed stop toothed ring, and the toothed ring has at least one blade tooth; the inner toothed ring is installed in the extrusion socket 1, When the metal tube 7 is squeezed and locked after being inserted, the blade teeth pierce the sealing coating/protective layer of the metal tube 7, and are carved into the tube wall of the metal tube 7 to ensure the axial fixation of the squeeze connection and prevent the tube end from being pulled out; The elastic coating layer 8 and the punctured sealing material covered by the inner gear ring simultaneously form a new extrusion seal for the damaged part under radial pressure; at the same time, the generation of voids is reduced and the extrusion is guaranteed. The stability of the seal; the combination of the above features can protect the interface, avoid the corrosion of the external environment, increase the safety and prolong the service life.

Preferably, the seal 6 of the press-fit metal pipe is located in the same section as the composite extrudable toothed ring, preferably in the section of the extrusion socket 1 .

The present invention provides a composite extrudable gear ring for a compression-type pipe, which has an inner gear ring 5 and an elastic coating layer 8; the elastic coating layer 8 is coated on the outside of the inner gear ring. It is one or more of the complete rubber-coated composite of the toothed ring, the non-coated composite of the outer ring of the toothed ring, the coated composite of the inner ring of the toothed ring, or the side-coated composite of the toothed ring;

The outer ring surface of the toothed ring is the outermost surface of the inner toothed ring 5 adjacent to the inner surface of the pipe fitting or the outermost surface along the normal direction of the axis of the inner toothed ring;

The inner ring surface of the toothed ring is the inner surface of the inner toothed ring 5 adjacent to the outer surface of the pipe installed in the pipe fitting or the innermost surface along the normal direction of the axis of the inner toothed ring;

Preferably, the inner annular surface is the innermost continuous annular surface of the inner toothed ring 5, rather than a discontinuous annular surface formed by a plurality of teeth on the inner toothed ring;

The side surface of the toothed ring is the side surface of the inner toothed ring 5 along the radial direction of the inner toothed ring or the direction in which the inner toothed ring is engraved into the pipe installed in the pipe fitting;

A preferred embodiment is that the toothed ring is completely encapsulated and compounded, which means that the composite extrudable toothed ring made of composite material is made of a steel inner toothed ring that is completely wrapped inside the material of the elastic coating layer 8, and the steel inner The gear ring does not come into contact with external corrosive media.

When the blade teeth of the steel inner gear ring after the metal pipe 7 is pressed into the pipe fitting is firmly stuck into the metal pipe 7 and surrounds the pipe body, the original protective film of the pipe wall, such as the zinc layer of the galvanized pipe, is The blade teeth will be damaged to a certain extent, forming weak corrosion-resistant scars, but the sealing protection of the elastic coating layer 8 material to the steel inner tooth ring blade teeth and the metal tube 7 scars will prolong the life of the interface.

Preferably, the elastic coating layer is provided with grooves along the inner circumference of the inner ring surface of the toothed ring.

Another preferred embodiment is that the outer ring surface of the toothed ring is not covered with rubber, which means that the inner toothed ring in the composite extrudable toothed ring is not covered by the elastic coating layer 8 material on the outer ring surface adjacent to the pipe. Instead, the outer ring surface of the inner gear ring is directly exposed and directly attached to the inner wall of the pipe fitting, which can reduce the fitting gap between the inner gear ring and the inner wall of the pipe fitting after the inner gear ring is installed in the pipe fitting and form a close fit; After the pressure socket 1 section is squeezed by external force, the pressure can be directly transmitted to the inner gear ring, the blade teeth are clamped into the outer wall of the metal tube 7, and the tube body is locked to prevent the metal tube 7 and the pipe fittings from being pulled out.

Another preferred embodiment is the rubber-coated compound 82 on the side of the toothed ring, which means that the inner toothed ring in the composite extrudable toothed ring is covered and compounded on the left and right sides of its radial inscription direction, which can protect the toothed ring The contact part between the blade teeth and the seal 6 is effectively isolated, and the seal 6 will not cause damage during installation and extrusion deformation, so as to ensure the reliability of the seal; The bare surface of the outer ring of the toothed ring is not affected by the external environment, which enhances the protection effect of the outer sealing side of the blade teeth.

Another preferred embodiment is that the inner ring of the toothed ring is covered with glue 83, which means that the inner toothed ring in the composite extrudable toothed ring is wrapped in the direction of the contact surface with the outer wall of the metal tube 7, and the inner toothed ring is attached to the pipe. All the teeth of the inner gear ring are sealed and wrapped in the glue material before the joint face is squeezed. When subjected to external extrusion force, the blade teeth will usually pierce the protection of the glue and directly clip into the outer surface layer of the metal tube 7, with a sufficient depth, which will cause the outer anti-corrosion protection layer of the metal tube 7 and cause local damage. While the blade teeth are stuck into the outer surface layer of the metal pipe 7, the punctured sealing surface also regenerates the sealing protection for the damaged part due to being squeezed, thereby enhancing the safety and life of the pipe connection.

These four composite structures of internal gear ring and plastic can realize different protection for different positions of the gear ring, and then realize the protection of the inside of the compression socket area of the compression connection, the protection of different positions on the two sides, and the multi-pipe Surface protection; the above protection positions can be selected according to the application scenarios and working conditions.

Preferably, the structure of the elastic coating layer 8 covering the outside of the inner gear ring is that the outer ring surface of the gear ring is not covered with glue, while the inner ring of the gear ring is covered with glue and the side of the tooth ring is covered with glue;

Preferably, the structure of the elastic coating layer 8 covering the outside of the inner gear ring is that the outer ring surface of the gear ring is not covered with glue and only the inner ring of the tooth ring is covered with glue;

Preferably, the structure of the elastic coating layer 8 covering the outside of the inner gear ring is that only the side of the gear ring is rubber-coated and compounded; preferably, the outer ring surface of the gear ring and the inner ring surface of the gear ring are bare metal surfaces;

Preferably, the structure of the elastic coating layer 8 covering the outside of the inner gear ring is that only the outer ring surface of the gear ring and the inner ring surface of the gear ring are bare metal surfaces, and the rest of the surfaces are covered by the elastic coating layer.

Preferably, the gear ring opening 56 of the inner gear ring is fully encapsulated and compounded to seal the gear ring, so as to protect the gear ring opening 56 from being affected by the environment, and can also meet the deformation needs during installation, and at the same time avoid the seal 6 . Injury, it saves a special isolation ring between the seal 6 and the inner gear ring.

Preferably, the elastic coating layer 8 is a rubber elastic body, which has good water and air tightness; the elastic coating layer 8 is evenly coated on the outside of the inner gear ring in the circumferential direction; the elastic coating layer 8 is connected to the inner teeth The rings are firmly attached by the composite coupling agent.

The inner gear ring is an elastic steel gear ring made of metal material.

As shown in FIG. 13-FIG. 15 , a preferred embodiment of the inner toothed ring, the inner toothed ring has an obliquely opened toothed ring opening portion 56 , which is symmetrically opened with a number of evenly distributed cut-off openings along the annular continuous portion 51 57. A plurality of arc-shaped long rings 52 are evenly distributed between the cut-off openings 57, wherein each arc-shaped long ring 52 points to the direction of the metal pipe body and is radially symmetrical with respect to a radial plane of the annular continuous portion 51. U shape.

Preferably, each arc-shaped long ring 52 is designed with a plurality of blades protruding radially;

Preferably, each arc-shaped long ring 52 is designed with directional cutting teeth 54 carved into the tube wall or the root 53 of the annular cutting teeth opening or inclined at a certain angle relative to the radial direction; preferably, the angle is inclined relative to the radial direction 10-20 degrees; preferably, the inclination angle of the blade teeth relative to the radial direction is equal to the inclination angle of the oblique opening of the annular continuous portion 51 relative to the radial direction.

After the inner toothed ring is squeezed by the outer circumference, the blade teeth 54 carved into the tube wall are embedded inside the outer wall of the metal tube 7 to obtain an elastic sealing protection state.

The blade-tooth structure is an equivalent-effect blade-tooth structure that can be embedded inside the outer wall of the metal tube 7 under the pressure of radial contraction.

As shown in Figures 16-19, a preferred embodiment of the inner gear ring, the inner gear ring comprises an annular continuous portion 51 and a plurality of blade teeth uniformly arranged along the periphery of the annular continuous portion 51, Each of the blade teeth points to the direction of the metal pipe body and is radially symmetrical with respect to a radial plane of the annular continuous portion 51;

As shown in FIGS. 20-23 , in the embodiment of the present invention, the inner gear ring includes an annular continuous portion 51 , and the annular continuous portion 51 is a whole ring with an oblique opening; The inclined opening can be partially encapsulated and compounded to leave the encapsulated compound extrudable ring gear opening 81, or the openings can be connected by elastic plastic to form a closed ring at the surface encapsulated compound; The two ends can be connected under the action of axial force, so that the inner gear ring forms a complete ring; preferably, there is only a narrow gap at the inclined opening. The inclined opening of the internal gear ring can avoid the uneven force and deformation of the gear ring caused by the too small clearance at the straight opening or the excessive clearance, and the inclined opening is easy to install before extrusion, and can be more easily installed during the extrusion process. Good adaptation to the actual working conditions, hold the metal pipe body tightly.

A preferred embodiment includes that the seal 6 can be an O-ring seal 63 or a special-shaped annular seal 62;

As shown in Figures 24 and 25, the special-shaped annular seal 62 has a main body sealing ring portion and a tail portion between the main body sealing ring portion and the pipe end limiting portion 3, and the tail portion includes a self-sealing tail ring seal Parts of the water stop ring to improve the reliability of the seal;

Preferably, the special-shaped annular seal 62 is not limited to the above-mentioned special-shaped structure, and may include structures with equivalent functions to improve sealing performance.

Another preferred embodiment includes that the extrusion socket 1 is reduced in diameter and transitions to the adjacent cannula socket 2, and then the diameter is reduced and transitioned to the limit position of the pipe segment; there is an inwardly rolled ring at the pipe fitting socket. stop.

As shown in FIGS. 26 and 27 , a preferred embodiment is a toothed ring composite self-sealing rubber ring in which the inner toothed ring, the elastic coating layer 8 covering the outside of the elastic toothed ring, and the sealing member 6 are made into one piece. This is to avoid the deformation and displacement of the seal 6 during the extrusion process, and the extrudable gear ring and the seal 6 are made into one body, which can simplify the structure and installation process and obtain a better sealing effect. Figure 26 shows a toothed ring composite self-sealing rubber ring with a special-shaped water stop ring, and Figure 27 shows a toothed ring composite self-sealing rubber ring with an O-shaped water stop ring.

Another preferred embodiment is that the inner gear ring, the elastic coating layer 8 covering the outside of the elastic gear ring and the seal 6 are pre-assembled components.

As shown in FIGS. 28 to 31 , a preferred embodiment of the present invention is an open composite extrudable toothed ring inner ring covered with rubber compound 83 , which means that the inner toothed ring in the composite extrudable toothed ring is in the It is wrapped in the direction of the abutment surface of the outer wall of the metal tube 7. Before the inner toothed ring and the tube abutting surface are squeezed, all the blades of the inner toothed ring are sealed and wrapped in the glue material. When subjected to external extrusion force, the blade teeth will usually pierce the protection of the glue and directly clip into the outer surface layer of the metal tube 7, with a sufficient depth, which will cause the outer anti-corrosion protection layer of the metal tube 7 and cause local damage. While the blade teeth are stuck into the outer surface layer of the metal pipe 7, the punctured sealing surface also regenerates the sealing protection for the damaged part due to being squeezed, thereby enhancing the safety and life of the pipe connection.

As shown in FIGS. 32-35 , the present invention also provides a compound 83 with a closed-mouth composite extrudable inner ring of the toothed ring, preferably an elastic wrapping layer that completely wraps the inner surface of the toothed ring along the toothed ring. The circumference of the inner ring surface forms a space for accommodating the deformation of the elastic coating layer after being squeezed; preferably, the elastic coating layer is provided with a groove 85 along the inner surface of the inner ring surface of the toothed ring.

Although various preferred embodiments of the present invention have been described in detail, additional changes and modifications to these embodiments will occur to those skilled in the art once the basic inventive concepts are known. Therefore, the appended claims are intended to be construed to include the preferred embodiment and all changes and modifications that fall within the scope of the present invention. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Thus, provided that these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

A composite extrudable toothed ring for a compression-type pipe fitting, having an inner toothed ring (5) and an elastic coating layer (8), characterized in that the elastic coating layer (8) is completely or partially coated Outside the inner gear ring (5).
The compound extrudable toothed ring according to claim 1, characterized in that: the inner toothed ring (5) is an integral open ring with a continuous circumference, and the integral open ring has an open portion of the toothed ring.
The composite extrudable toothed ring according to claim 2, characterized in that: the elastic coating layer is a circumferentially continuous integral closed ring supported on the inner toothed ring (5), and the elastic coating layer A space for accommodating the deformation of the elastic coating layer after being squeezed is constructed at the position of the gear ring opening on the inner gear ring (5); preferably, the elastic coating layer is thinned at the position of the gear ring opening; preferably the elastic coating is The cladding is provided with a groove at the position of the opening of the gear ring.
The composite extrudable toothed ring according to claim 1, characterized in that: the inner toothed ring (5) is a hard elastic metal toothed ring, preferably an elastic steel toothed ring; the elastic coating layer is an elastic plastic It is preferably made of elastic rubber material; preferably, the composite extrudable toothed ring is made of elastic steel toothed ring and elastic plastic material; the elastic coating layer is composed of one or more layers of elastic plastic material.
A composite extrudable toothed ring for a compression-type pipe, having an inner toothed ring (5) and an elastic coating layer (8), characterized in that the inner toothed ring (5) comprises an annular continuous portion ( 51) and a plurality of blade teeth uniformly arranged along its periphery on the annular continuous portion (51), preferably each of the blade teeth points to the direction of the metal pipe body and a radial direction relative to the annular continuous portion (51) The plane is symmetrical with the radial direction; or the inner toothed ring (5) includes an annular continuous portion (51), and the annular continuous portion (51) is an integral split ring with an oblique opening, along the annular continuous portion (51) A plurality of cut-off openings (57) are evenly distributed symmetrically, and a plurality of arc-shaped long rings (52) are evenly distributed between the cut-off openings (57), wherein each arc-shaped long ring (52) points to the metal tube (7) The direction and relative to a radial plane of the annular continuous part (51) are radially symmetrical and U-shaped; the elastic coating layer (8) is not covered on the surface of the annular continuous part (51); preferably the annular connecting part The surface of (51) is a bare metal surface.
A composite extrudable toothed ring for a compression-type pipe, having an inner toothed ring (5) and an elastic coating layer (8), characterized in that:

The structure of the elastic coating layer (8) covering the outside of the inner gear ring is that the gear ring is completely covered with glue, the outer ring of the gear ring is not covered with glue, the inner ring of the gear ring is covered with glue or the side of the gear ring is covered. One or more of glue compounding;

The outer ring surface of the toothed ring is the outermost surface of the inner toothed ring (5) on its outer surface adjacent to the inner surface of the pipe fitting or along the normal direction of the axis of the inner toothed ring;

The inner ring surface of the toothed ring is the inner surface of the inner toothed ring (5) adjacent to the outer surface of the pipe installed in the pipe fitting or the innermost surface along the normal direction of the axis of the inner toothed ring;

The side surface of the toothed ring is the side surface of the inner toothed ring (5) along the radial direction of the inner toothed ring or the direction in which the inner toothed ring is engraved into the pipe installed in the pipe fitting;

The fully encapsulated and compounded structure of the toothed ring is as follows: the inner toothed ring (5) is completely wrapped by the elastic plastic material of the elastic coating layer (8), so that the inner toothed ring (5) does not contact the external medium; preferably, the elastic wrapping The cladding layer forms a space along the inner surface of the circumference of the inner ring surface of the toothed ring to accommodate the deformation of the elastic cladding layer after being squeezed; preferably, the elastic cladding layer is partially thinned along the inner surface of the circumference of the inner annular surface of the toothed ring; The coating layer is provided with grooves along the inner surface of the inner ring surface of the gear ring;

The outer ring surface of the toothed ring is not covered with glue and the composite structure is as follows: the outer ring surface of the toothed ring is directly exposed to the outside, and is not covered by the elastic plastic material of the elastic coating layer (8); the toothed ring is in use. The outer ring surface is in contact with the pipe fitting and fits on the inner wall of the pipe fitting;

The composite structure of the inner ring of the toothed ring with rubber is as follows: the inner annular surface of the toothed ring is completely or partially wrapped in the elastic plastic material of the elastic coating layer (8), so that the inner toothed ring (5) is fitted with the pipe Before the surface is squeezed, the blade teeth that engrave the inner toothed ring (5) into the outer wall of the pipe are all sealed and wrapped in the elastic plastic material; The circumference constitutes a space for accommodating the deformation of the elastic coating layer after being squeezed; preferably, the elastic coating layer is partially thinned along the inner surface of the inner ring surface of the toothed ring; preferably the elastic coating layer is along the inner surface of the toothed ring. There are grooves on the inner surface;

The structure of the rubber-coated compound (82) on the side of the toothed ring is as follows: the side of the inner toothed ring (5) is completely or partially covered with rubber, so that the inner toothed ring (5) is installed in the pipe fitting. When the fitting surface of the pipe is pressed, the inner toothed ring (5) is engraved between the outer surface of the pipe and the outer surface of the pipe and is completely covered and sealed by the elastic plastic.
A compression-type pipe fitting, which has an extrusion socket (1), an intubation socket (2) and a pipe end limiting portion (3), and the composite extrudable according to any one of claims 1-6 is applied. Gear ring, characterized by:

The wall thickness of the pipe in the extrusion socket (1) section is not greater than the wall thickness of the pipe insertion socket (2) section and the pipe end limiting portion (3) section; preferably in the extrusion socket (1) The pipe fitting wall thickness of the section is smaller than the wall thicknesses of the pipe fitting insertion socket (2) section and the pipe end limiting portion (3) section.
The compression type pipe fitting according to claim 7, characterized in that:

The pipe fitting comprises an inwardly wound ring (4) at the port, which is provided on the press-fitted pipe fitting and is used for positioning or dividing the compound extrudable toothed ring to protrude, and the inwardly wound ring (4) at the port is connected to the extrusion socket. (1) is connected, and the cannula socket (2) connected with the extrusion socket (1);

At least one composite extrudable toothed ring (9) and a sealing member (6) made of composite material are arranged in the port inwardly wound ring (4); preferably, the composite extruded toothed ring (9) and the sealing member (6) Make an integral gear ring composite self-sealing rubber ring; preferably the sealing member (6) is a special-shaped annular sealing member (62) or an O-ring-shaped sealing member (63) provided with a water stop ring.