CN212509902U - Pipe fitting for connecting blunt tooth ring and high pressure-resistant crimping metal pipe - Google Patents
Pipe fitting for connecting blunt tooth ring and high pressure-resistant crimping metal pipe Download PDFInfo
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- CN212509902U CN212509902U CN202021805211.XU CN202021805211U CN212509902U CN 212509902 U CN212509902 U CN 212509902U CN 202021805211 U CN202021805211 U CN 202021805211U CN 212509902 U CN212509902 U CN 212509902U
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Abstract
The utility model discloses a cogged ring and high withstand voltage crimping connect pipe fitting of tubular metal resonator, cogged ring be used for the pipe fitting to connect, cogged ring be the split ring, cogged ring have an inner circumferential surface, inner circumferential surface inwards bulge and be formed with a plurality of profile of tooth tops, a plurality of profile of tooth tops along inner circumferential surface axial evenly arrange and form the sword ring; the tooth-shaped top end comprises a first arc section and a second arc section, and the first arc and the second arc are both outwards protruded in the radial direction. The utility model provides a be applied to the excessive pressure that the metal pipe fitting of industrial pipeline and building pipeline and the formula of inserting between the tubular product that inserts the present connection mode of formula of taking off risk and locking structure inefficacy take off the risk.
Description
Technical Field
The utility model relates to a pipe fitting field, more specifically relates to a cogged ring and high withstand voltage crimping connect metal pipe's pipe fitting.
Background
In the existing connection technology of metal pipe fittings and pipes, the common modes of non-threaded connection and non-welded connection are mostly adopted by adopting the connection modes of clamping and pressing of a sealing ring and clamping and pressing of a metal ring. Because the design does not have the fixing and locking functions like a thread and welding connection method, the common defects of the two methods are as follows:
a) the safe pressure bearing value is only PN 16;
b) in the case of a pressure exceeding PN16, which may occur, the system connection cannot be secured and a breakout occurs;
c) when the elements of the locking structure are corroded chemically or the physical rigidity fails, the pipeline system is inevitably burst.
In the fluid conveying pipeline system, because the faults existing in the pressure generating source and the pressure control device are inevitable, the pressure out of control is the accident that the PN16 exceeds or even is larger, so that the danger of the sudden falling of the pipe fitting and the pipe cannot be avoided under the connection mode of the clamping and pressing type sealing ring and the clamping and pressing type metal ring.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the prior art, the utility model aims to provide a pipe fitting of blunt ring gear, high withstand voltage crimping connection metal pipe and processing method's technical scheme specifically does:
the blunt tooth ring is a split ring and is provided with an inner circumferential surface, a plurality of tooth-shaped top ends are formed by inwards protruding the inner circumferential surface, and the tooth-shaped top ends are uniformly arranged along the inner circumferential surface in the axial direction to form a blade ring; the tooth-shaped top end comprises a first arc section and a second arc section, and the first arc section and the second arc section both protrude outwards in the radial direction, namely the first arc section and the second arc section are arranged in a back-to-back manner, or the first arc section and the second arc section are arranged in an externally tangent manner; the radial outward protrusion mode enables the tooth-shaped top end to have a negative cut-in angle, so that the tooth-shaped top end can be conveniently cut into the metal pipe, and the crimping resistance when the pipe fitting is crimped is reduced; in addition, after the blunt tooth ring is cut into the metal pipe in a crimping mode, residual stress is usually remained due to crimping, and the negative cut-in angle can reduce the residual stress of the knife edge ring, so that radial expansion caused by the residual stress is avoided, and the pipe fitting is effectively prevented from being disconnected;
preferably, a cutting edge transition surface is connected between the first circular arc section and the second circular arc section, the cutting edge transition surface generally has a small circumferential size, and through the arrangement of the cutting edge transition surface, the difficulty of processing the tooth-shaped top end by the cutter tooth can be reduced, the phenomenon of tooth breakage during processing can be avoided, on the other hand, the tooth-shaped top end can be avoided from being too sharp, the phenomenon of accidental injury of workers during installation can be prevented, and the operation safety of the pipe fitting can be improved; the first arc surface and the second arc surface which are respectively positioned on the top ends of the adjacent tooth shapes are connected through a transition arc, and the protruding direction of the transition arc is outward along the radial direction; the blunt gear ring is provided with an outer circumferential surface, a plurality of circular arc grooves are arranged on the outer circumferential surface, and the circular arc grooves are arranged on the radial outer side between two adjacent tooth-shaped top ends;
preferably, the blade ring is a single ring structure;
preferably, the blade rings are of a double-ring structure, two blade rings are axially arranged at intervals at the edge position of the inner circumference, and an annular cavity is formed in the blade rings;
preferably, the number of the knife edge rings is at least three, a plurality of the knife edge rings are arranged at intervals, and the knife edge rings are uniformly arranged on the inner circumference along the axial direction;
preferably, the tooth-shaped top ends of different blade rings are circumferentially staggered, and the anti-pulling capacity of the pipe fitting can be effectively improved through the axial staggered arrangement mode;
preferably, the blade transition surface protrudes radially inward;
preferably, the arc-shaped groove is provided with a stress hole, and the stress hole penetrates through the blunt tooth ring along the radial direction; the stress hole can further reduce the residual stress after crimping and improve the connection stability of the pipe fitting.
A pipe fitting for connecting a metal pipe in a high pressure-resistant compression joint mode comprises a metal pipe and a pipe fitting main body, wherein the metal pipe is matched with the pipe fitting main body in an insertion mode, the pipe fitting main body comprises a socket section, a transition section and a neck section, the transition section is connected between the neck section and the socket section, and the transition section is of a conical structure; a spacer ring is arranged in the socket section; the inner cavity of the bellmouth section is divided into a limiting cavity and a sealing cavity by the spacer ring, a blunt gear ring is arranged in the limiting cavity, and a rubber ring is arranged in the sealing cavity; an inserting cavity is formed inside the tube neck section; the metal pipe sequentially passes through the limiting cavity and the sealing cavity to be inserted in the inserting cavity; the tail end of the socket section is connected with a baffle ring, the inner diameter of the baffle ring is smaller than that of the limiting cavity, and the blunt gear ring has the structure;
preferably, the taper angle of the transition section is alpha, wherein alpha is 5-30 degrees, so that the pipe fitting material is prevented from being pressed into the pipe when the pipe is deformed by compression joint, the compression joint force is increased, and the deformation amount of the rubber ring on the edge is reduced after the pipe is deformed;
preferably, the spacer ring and the pipe fitting main body are of an integrated structure;
preferably, the spacer ring and the pipe fitting main body are of a split structure, and the axial thickness of the radial outer side of the spacer ring is smaller than the axial thickness of the radial inner side of the spacer ring;
preferably, the spacer ring is formed by mechanical crimping.
The pipe fitting for high pressure resistance crimping connection of the metal pipe is obtained by the following method: (1) processing of the pipe fitting main body: selecting a cylindrical blank to manufacture a pipe fitting main body, wherein the bell mouth section and the transition section form a limiting cavity and a sealing cavity in a mechanical turning mode; (2) reserving blank size to form the spacer ring when the limiting cavity and the sealing cavity are turned; or the limiting cavity and the sealing cavity have the same inner diameter during turning, and are separated by arranging a spacer ring; (3) machining a blunt gear ring: the blank of the blunt gear ring is punched into a strip shape and then rolled into a round shape with a notch, when the blade ring is of a single-ring structure, a tooth-shaped top end structure on the blunt gear ring is formed by directly punching on a plate, or when the blade ring is of a single-ring structure, the annular cavity is formed by punching and turning after punching; carrying out heat treatment on the formed blunt gear ring; (4) the heat treatment process of the blunt gear ring comprises the following steps: when the blunt ring material is martensite, no anticorrosive treatment is carried out; when the blunt gear ring material is a carbon steel material except martensite, performing multicomponent alloy co-infiltration surface anticorrosion treatment; (5) in the machining of the blunt gear ring in the step (3), the height of the tooth shape is determined according to the specification of a compression joint pipe, so that the uniform depth of the pipe pressed in can be ensured;
the thickness of the metal pipe is D, the height of the top end of the tooth form is H, and H is (0.2-0.5) D;
preferably, after the blunt teeth are pressed into the tubing, each tooth is capable of withstanding an axial tension of 0.5-1.5 KN.
Has the advantages that:
(1) the utility model provides a be applied to the excessive pressure that the metal pipe fitting of industrial pipeline and building pipeline and the formula of inserting between the tubular product that inserts the present connection mode of formula of taking off risk and locking structure inefficacy take off the risk. That is, the utility model discloses a structure accomplishes the anticreep between metal system pipe fitting and the tubular product and ends the function under the risk condition that exists probably to, ooze technology altogether through many first alloys to blunt ring gear surface anti-corrosion treatment, effectively avoided dull ring gear corrosion in the use.
(2) The arrangement mode that the first arc surface and the second arc surface are radially and outwards protruded enables the tooth-shaped top end to have a negative cut-in angle, so that the tooth-shaped top end can be conveniently cut into the metal pipe, and the crimping resistance when the pipe fitting is crimped is reduced; in addition, after the blunt tooth ring is cut into the metal pipe in a crimping mode, residual stress is usually remained due to crimping, and the negative cut-in angle can reduce the residual stress of the knife edge ring, so that radial expansion caused by the residual stress is avoided, and the pipe fitting is effectively prevented from being disconnected;
(3) after the blunt teeth are pressed into the pipe, the blunt teeth can bear larger axial tension, and each tooth can bear 0.5-1.5KN according to different materials of the blunt tooth ring and the pipe;
(4) the taper angle of the transition section is alpha, and the alpha is 5-30 degrees, so that the pipe fitting material is prevented from being pressed into the pipe when the pipe is pressed and deformed, the pressing force is increased, and the deformation amount of the rubber ring on the edge is reduced after the pipe is deformed;
(5) the stress hole can further reduce the residual stress after crimping and improve the connection stability of the pipe fitting.
Drawings
Fig. 1 is a sectional view of a pipe member for high pressure resistance crimp connection of a metal pipe of a first embodiment;
figure 2 is a cross-sectional view of the pipe body of the first embodiment;
fig. 3 is an exploded view of the pipe member for high pressure resistance crimp connection of the metal pipes of the first embodiment;
fig. 4 is a sectional view of a fitting for high pressure resistance crimp connection of a metal pipe of the second embodiment;
figure 5 is a cross-sectional view of a pipe body of the second embodiment;
fig. 6 is an exploded view of a fitting for high pressure resistance crimp connection of a metal pipe of the second embodiment;
FIG. 7 is an axial view of a cogged ring with a single ring structure of the blade ring;
FIG. 8 is a front view of a cogged ring with a single ring structure of the blade ring;
FIG. 9 is an extension of the cogged ring of the single ring configuration from an internal view;
FIG. 10 is an enlarged view of a portion of area A of FIG. 7;
FIG. 11 is an axial view of a cogged ring with a cutting edge ring having a double ring structure;
FIG. 12 is a front view of a cogged ring with a knife-edge ring having a double ring structure;
FIG. 13 is an extension view of the cogged ring of the dual ring structure from an inside perspective;
fig. 14 is a partially enlarged view of the region B in fig. 11.
Reference numerals:
the pipe fitting comprises a metal pipe 1, a pipe fitting main body 2, a socket section 3, a transition section 4, a pipe neck section 5, a spacer ring 6, a limiting cavity 7, a sealing cavity 8, a blunt tooth ring 9, a rubber ring 10, a baffle ring 11, a tooth-shaped top end 12, a first arc section 13, a second arc section 14, a blade transition surface 15, a transition arc 16, an annular cavity 17, an arc-shaped groove 18 and a stress hole 19.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings in the embodiment of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art without creative work belong to the protection scope of the present invention.
Preferred embodiment 1:
as shown in fig. 1-3, a pipe fitting for connecting a metal pipe by high pressure resistance crimping comprises a metal pipe 1 and a pipe fitting main body 2, wherein the metal pipe 1 is in splicing fit with the pipe fitting main body 2, and the pipe fitting is characterized in that: the pipe fitting main body 2 comprises a socket section 3, a transition section 4 and a pipe neck section 5, wherein the transition section 4 is connected between the pipe neck section 5 and the socket section 3, and the transition section 4 is of a conical structure; a spacer ring 6 is arranged in the socket section 3; the inner cavity of the bellmouth section 3 is divided into a limiting cavity 7 and a sealing cavity 8 by the spacer ring 6, a blunt gear ring 9 is arranged in the limiting cavity 7, and a rubber ring 10 is arranged in the sealing cavity 8; an inserting cavity is formed inside the tube neck section 5; the metal pipe 1 sequentially passes through the limiting cavity 7 and the sealing cavity 8 to be inserted in the inserting cavity; the tail end of the bell mouth section 3 is connected with a baffle ring 11, and the inner diameter of the baffle ring 11 is smaller than that of the limiting cavity 7; the taper angle of the transition section 4 is alpha, the alpha is 5-30 degrees, so that the pipe fitting material can be prevented from being pressed into the pipe when the compression joint is deformed, the compression joint force is increased, the deformation amount of the rubber ring 10 on the edge is reduced after the pipe is deformed, and the pipe fitting is of an integrated structure.
Preferred embodiment 2:
as shown in fig. 4-6, a pipe fitting for connecting a metal pipe by high pressure resistance crimping comprises a metal pipe 1 and a pipe fitting main body 2, wherein the metal pipe 1 is in insertion fit with the pipe fitting main body 2, and the pipe fitting is characterized in that: the pipe fitting main body 2 comprises a socket section 3, a transition section 4 and a pipe neck section 5, wherein the transition section 4 is connected between the pipe neck section 5 and the socket section 3, and the transition section 4 is of a conical structure; a spacer ring 6 is arranged in the socket section 3; the inner cavity of the bellmouth section 3 is divided into a limiting cavity 7 and a sealing cavity 8 by the spacer ring 6, a blunt gear ring 9 is arranged in the limiting cavity 7, and a rubber ring 10 is arranged in the sealing cavity 8; an inserting cavity is formed inside the tube neck section 5; the metal pipe 1 sequentially passes through the limiting cavity 7 and the sealing cavity 8 to be inserted in the inserting cavity; the tail end of the bell mouth section 3 is connected with a baffle ring 11, and the inner diameter of the baffle ring 11 is smaller than that of the limiting cavity 7; the taper angle of the transition section 4 is alpha, and the alpha is 5-30 degrees, so that the pipe fitting material is prevented from being pressed into the pipe when the pipe is deformed by compression, the compression force is increased, and the deformation amount of the rubber ring 10 on the edge is reduced after the pipe is deformed; the spacer ring 6 and the pipe fitting main body 2 are of a split structure, and the axial thickness of the radial outer side of the spacer ring 6 is smaller than the axial thickness of the radial inner side of the spacer ring 6; the spacer rings 6 are formed by mechanical crimping.
The first preferred expression of the blunt ring:
as shown in fig. 7-10, the cogged ring 9 is a split ring, the cogged ring 9 has an inner circumferential surface, the inner circumferential surface is protruded inwards to form a plurality of tooth-shaped tips 12, and the tooth-shaped tips 12 are uniformly arranged along the inner circumferential surface in the axial direction to form a blade ring; the blade ring is of a single-ring structure; preferably, the tooth-shaped top end 12 includes a first arc segment 13 and a second arc segment 14, both of which are protruded radially outward, that is, the first arc segment 13 and the second arc segment 14 are arranged in a back-to-back manner, or may also be referred to as that the first arc segment 13 and the second arc segment 14 are arranged in an circumscribed manner; the radial outward protrusion mode enables the tooth-shaped top end 12 to have a negative cut-in angle, so that the tooth-shaped top end 12 can be conveniently cut into the metal pipe 1, and the crimping resistance when a pipe fitting is crimped is reduced; in addition, after the blunt gear ring 9 is cut into the metal pipe 1 in a crimping mode, residual stress is usually remained due to crimping, and a negative cut-in angle can reduce the residual stress of the knife edge ring, so that radial expansion due to the residual stress is avoided, and pipe detachment is effectively avoided; a cutting edge transition surface 15 is connected between the first circular arc section 13 and the second circular arc section 14, the cutting edge transition surface 15 generally has a small circumferential size, and through the arrangement of the cutting edge transition surface 15, on one hand, the difficulty of processing the tooth-shaped top end 12 by the cutter tooth can be reduced, the phenomenon of tooth breakage during processing can be avoided, on the other hand, the tooth-shaped top end 12 can be avoided from being too sharp, the phenomenon that a worker accidentally injures during installation can be prevented, and the operation safety of the pipe fitting can be improved; the blade transition surface 15 is arc-shaped, and the blade transition surface 15 protrudes inwards along the radial direction; the first arc surface and the second arc surface which are respectively positioned on the adjacent tooth-shaped top ends 12 are connected through a transition arc 16, and the protruding direction of the transition arc 16 is outward along the radial direction; the blunt gear ring 9 is provided with an outer circumferential surface, a plurality of circular arc grooves 18 are arranged on the outer circumferential surface, and the circular arc grooves 18 are arranged on the radial outer side between two adjacent tooth-shaped top ends 12;
a second preferred expression of a blunt ring:
as shown in fig. 11-14, the blade ring has a double ring structure, and the blade rings are axially spaced at the edge of the inner circumference, and an annular cavity 7 is formed in the blade ring; preferably, the blade ring is of a double-ring structure, and the tooth-shaped top ends 12 on different blade rings are arranged in a circumferentially staggered manner; through the setting mode of axial staggered arrangement, can effectively improve the anti-drawing ability of pipe fitting.
A third preferred expression for a blunt ring:
the knife edge rings are the same as the knife edge rings which are double-ring structure blunt tooth rings, and the difference is that the number of the knife edge rings is at least three, a plurality of knife edge rings are arranged at intervals, and the knife edge rings are uniformly arranged on the inner circumference along the axial direction.
In addition, the pipe fitting for high pressure resistance crimping connection of metal pipes is obtained by the following method: (1) processing of the pipe fitting main body 2: selecting a cylindrical blank to manufacture the pipe fitting main body 2, wherein the socket section 3 and the transition section 4 form a limiting cavity 7 and a sealing cavity 8 in a mechanical turning mode; (2) when the limiting cavity 7 and the sealing cavity 8 are turned, blank sizes are reserved to form the spacer ring 6; or the limiting cavity 7 and the sealing cavity 8 have the same inner diameter during turning, and are separated by arranging the spacer ring 6;
(3) machining the blunt gear ring 9: after being punched into a strip shape, the strip-shaped blank is rolled into a round shape with a notch, when the blade edge ring is of a single-ring structure, the blank is directly punched and molded on the plate, or when the blade edge ring is of a single-ring structure, the annular cavity 7 is formed by punching and molding and then turning; carrying out heat treatment after molding;
(4) the heat treatment process of the blunt gear ring 9 comprises the following steps: when the material of the blunt gear ring 9 is martensite, no anticorrosive treatment is carried out; when the blunt ring 9 is made of carbon steel material except martensite, multi-component alloy co-infiltration surface corrosion prevention treatment is needed;
(5) in the machining of the blunt toothed ring 9 in the step (3), the height of the tooth shape is determined according to the specification of the compression joint pipe, so that the uniform depth of the pipe pressed in can be ensured.
Various modifications and changes may be made by those skilled in the art to the present invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents. The above embodiments are provided only for the purpose of illustration, not for the limitation of the present invention, and those skilled in the relevant art can make various changes or modifications without departing from the spirit and scope of the present invention, therefore, all equivalent technical solutions should also belong to the scope of the present invention, and should be defined by the claims.
Claims (10)
1. The utility model provides a cogged ring, cogged ring be used for the pipe connection which characterized in that: the blunt gear ring is a split ring and is provided with an inner circumferential surface, a plurality of tooth-shaped top ends are formed by inward projection of the inner circumferential surface, and the tooth-shaped top ends are uniformly distributed along the axial direction of the inner circumferential surface to form a blade ring; the tooth-shaped top end comprises a first arc section and a second arc section, the first arc section and the second arc section both protrude outwards in the radial direction, a blade transition surface is connected between the first arc section and the second arc section, and the blade transition surface protrudes inwards in the radial direction; the first arc surface and the second arc surface which are respectively positioned on the top ends of the adjacent tooth shapes are connected through a transition arc, and the protruding direction of the transition arc is outward along the radial direction; the blunt gear ring is provided with an outer circumferential surface, a plurality of circular arc grooves are arranged on the outer circumferential surface, and the circular arc grooves are arranged on the radial outer side between two adjacent tooth-shaped top ends; the arc-shaped groove is provided with a stress hole, and the stress hole penetrates through the blunt tooth ring along the radial direction.
2. The blunt gear ring as recited in claim 1, wherein: the blade ring is of a single ring structure.
3. The blunt gear ring as recited in claim 1, wherein: the knife edge rings are of a double-ring structure, the two knife edge rings are axially arranged at the edge position of the inner circumference at intervals, and an annular cavity is formed in the middle of each knife edge ring.
4. The blunt gear ring as recited in claim 1, wherein: the number of the blade rings is at least three, the blade rings are arranged at intervals, and the blade rings are uniformly arranged on the inner circumference along the axial direction.
5. The cogged ring according to either one of claims 3 or 4, wherein: the tooth-shaped top ends on different blade rings are arranged in a staggered mode in the circumferential direction.
6. A pipe fitting for connecting a metal pipe in a high pressure-resistant compression joint mode comprises a metal pipe and a pipe fitting main body, wherein the metal pipe is matched with the pipe fitting main body in an insertion mode, the pipe fitting main body comprises a socket section, a transition section and a neck section, the transition section is connected between the neck section and the socket section, and the transition section is of a conical structure; a spacer ring is arranged in the socket section; the inner cavity of the bellmouth section is divided into a limiting cavity and a sealing cavity by the spacer ring, a blunt gear ring is arranged in the limiting cavity, and a rubber ring is arranged in the sealing cavity; an inserting cavity is formed inside the tube neck section; the metal pipe sequentially passes through the limiting cavity and the sealing cavity to be inserted in the inserting cavity; bellmouth section end be connected with and keep off the ring, keep off the ring internal diameter and be less than the internal diameter in spacing chamber, its characterized in that: the blunt ring has the structure according to any one of claims 1 to 5.
7. A pipe member for high pressure resistance crimp connection of a metal pipe as set forth in claim 6, wherein: the taper angle of the transition section is alpha, wherein alpha is 5-30 degrees.
8. A pipe member for high pressure resistance crimp connection of a metal pipe as set forth in claim 6, wherein: the spacer ring and the pipe fitting main body are of an integrated structure.
9. A pipe fitting for high pressure resistance crimp connection of metal pipes according to any one of claims 6 or 7, wherein: the spacer ring and the pipe fitting main body are of a split structure, and the axial thickness of the radial outer side of the spacer ring is smaller than that of the radial inner side of the spacer ring; the spacer ring is formed by mechanical crimping.
10. A pipe member for high pressure resistance crimp connection of metal pipes as set forth in claim 6, wherein: the thickness of the metal pipe is D, the height of the top end of the tooth form is H, and H is (0.2-0.5) D.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021805211.XU CN212509902U (en) | 2020-08-26 | 2020-08-26 | Pipe fitting for connecting blunt tooth ring and high pressure-resistant crimping metal pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021805211.XU CN212509902U (en) | 2020-08-26 | 2020-08-26 | Pipe fitting for connecting blunt tooth ring and high pressure-resistant crimping metal pipe |
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| CN212509902U true CN212509902U (en) | 2021-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021805211.XU Active CN212509902U (en) | 2020-08-26 | 2020-08-26 | Pipe fitting for connecting blunt tooth ring and high pressure-resistant crimping metal pipe |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111853385A (en) * | 2020-08-26 | 2020-10-30 | 江苏领嘉科技有限公司 | Pipe fitting for connecting metal pipe through blunt tooth ring and high pressure resistance compression joint and machining method thereof |
-
2020
- 2020-08-26 CN CN202021805211.XU patent/CN212509902U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111853385A (en) * | 2020-08-26 | 2020-10-30 | 江苏领嘉科技有限公司 | Pipe fitting for connecting metal pipe through blunt tooth ring and high pressure resistance compression joint and machining method thereof |
| CN111853385B (en) * | 2020-08-26 | 2024-07-19 | 江苏领嘉科技有限公司 | Blunt tooth ring, pipe fitting for connecting metal pipe by high-pressure-resistant compression joint and processing method of pipe fitting |
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