CN212107301U - Threaded connection type pipe joint - Google Patents
Threaded connection type pipe joint Download PDFInfo
- Publication number
- CN212107301U CN212107301U CN202020637356.7U CN202020637356U CN212107301U CN 212107301 U CN212107301 U CN 212107301U CN 202020637356 U CN202020637356 U CN 202020637356U CN 212107301 U CN212107301 U CN 212107301U
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- China
- Prior art keywords
- straight cylinder
- cylinder section
- sleeve
- threaded connection
- core
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Abstract
The utility model discloses a threaded connection type pipe joint, aiming at solving the problems that in the existing pipe joint, when the sleeve and the whole core are welded, the sealing ring is difficult to install, and the welding is easy to crack, so that the welding part needs to be subjected to flaw detection, and the working efficiency is reduced; and when the screw thread section is set up at will between core of the whole body and the bush, then in the course of withholding, the tooth of the screw thread section is damaged very easily, the problem that the bush slips easily, the utility model sets the whole body core as the annular step, and connect the bush with middle step screw thread, also set up the external screw thread near the high step; the end face of the sleeve and the connecting face are arranged to be a labyrinth seal structure, the sleeve extends towards the center of the whole core in the buckling process, the buckling pressure generates acting force on the internal thread on the sleeve and the external thread on the middle step, at the moment, the connecting face generates reverse acting force on the sleeve, the two acting forces are mutually offset, and the damage to the internal thread and the external thread is reduced.
Description
Technical Field
The utility model relates to a coupling, concretely relates to threaded connection's coupling.
Background
The existing buckling-pressing type pipe joint for hydraulic pipes and nonmetal composite pipes generally comprises a through core and two sleeves, wherein the two sleeves are welded or in threaded connection with the through core, when the pipe joint is connected with a pipe body, two pipelines to be connected are respectively sleeved between the through core and the two sleeves, and the sleeves are reduced to a specified size by using special buckling-pressing (pipe-reducing) equipment to complete the connection of the two pipelines. However, when the sleeve and the entire core are welded, it is very difficult to install the seal ring, and the welding is prone to generating cracks in the buckling process, so that after each buckling is completed, nondestructive testing (i.e. flaw detection) needs to be performed on the welded part, and the working efficiency is reduced; in addition, when the sleeve is in threaded connection with the whole core, the conventional thread section is randomly arranged, and teeth of the thread section are easily damaged due to extrusion force in the buckling process, so that the sleeve is easy to slip.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problems that in the pipe joint in the prior art, when the sleeve and the whole core are welded, the sealing ring is difficult to install, and the welding is easy to crack in the buckling process, so that the welding part needs to be subjected to flaw detection after each buckling is finished, thereby reducing the working efficiency; and when the sleeve is in threaded connection with the through core, the conventional thread section is randomly arranged, and in the buckling and pressing process, the teeth of the thread section are easily damaged due to extrusion force, so that the sleeve is easy to slip, and the technical problem is solved.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
a threaded connection type pipe joint comprises a whole core and two sleeves respectively sleeved at two ends of the whole core; the gap between the outer surface of the through core and the inner surface of the sleeve is matched with the wall thickness of the pipeline to be connected;
it is characterized in that:
the outer peripheral surfaces of two ends of the whole core are provided with annular steps;
the annular steps comprise a high step, a middle step and a low step which are sequentially arranged from the center of the whole core to two ends;
the middle step is provided with an external thread, and the external thread is arranged close to the high step;
the sleeve comprises a first straight cylinder section, a frustum section and a second straight cylinder section which are coaxially connected in sequence;
the large end of the frustum section is connected with the first straight cylinder section, and the small end of the frustum section is connected with the second straight cylinder section; the inner wall of the second straight cylinder section is provided with internal threads;
the second straight cylinder section is in threaded connection with the middle step, and the end face of the second straight cylinder section is tightly attached to the joint face between the high step and the middle step;
and a labyrinth sealing structure is arranged between the second straight cylinder section and the connecting surface.
Furthermore, a first annular groove and a first annular bulge are arranged on the end surface of the second straight cylinder section;
and a second annular bulge matched with the first annular groove and a second annular groove matched with the first annular bulge are arranged on the connecting surface.
Further, the internal thread and the external thread are both right-angle trapezoidal threads.
Furthermore, a first pawl structure is arranged on the outer wall of the whole core;
and a second inverted tooth structure is arranged on the inner wall of the sleeve.
Further, the first inverted tooth structure is arranged on the low step;
the second inverted tooth structure is arranged on the inner wall of the first straight cylinder section.
Furthermore, an O-shaped sealing ring is sleeved on the low step.
Furthermore, the outer wall of the middle part of the whole core is provided with an annular fastening limiting groove for buckling.
Further, the first straight cylinder section, the frustum section and the second straight cylinder section are integrally formed.
The utility model has the advantages that:
1. the utility model sets the outer peripheral surface of the whole core as an annular step, connects the sleeve with the middle step by screw thread, and sets the external screw thread near the high step; the joint surface between the end surface of the sleeve and the high step and the middle step is set to be a labyrinth seal structure, so that the sleeve extends towards the center of the whole core in the buckling process, the buckling pressure generates an acting force on the internal thread on the sleeve and the external thread on the middle step, and the joint surface plays a reverse acting force on the sleeve at the moment, so that the effect of the buckling pressure on the internal thread and the external thread is counteracted, the damage of the internal thread and the external thread is avoided, and the sleeve can be further prevented from slipping.
2. The utility model is provided with a first annular groove and a first annular bulge on the end surface of the second straight cylinder section; and a second annular bulge matched with the first annular groove and a second annular groove matched with the first annular bulge are arranged on the joint surface between the high step and the middle step, so that a labyrinth seal structure is formed. In the connection, the sleeve and the through core are connected more tightly through buckling (shrinking) so as to increase the sealing performance and the connection reliability between the sleeve and the through core.
3. The utility model discloses in, the internal thread on external screw thread on the well step and the straight section of thick bamboo of second is trapezoidal thread, and trapezoidal thread's intensity is better, and its antiskid is taken off the effect better moreover.
4. The utility model comprises a whole core and two sleeves respectively sleeved at two ends of the whole core; the two sleeves are respectively in threaded connection with the whole core; when the O-shaped sealing ring is sleeved, the sleeve can be detached firstly, the sleeve is connected with the whole core after the O-shaped sealing ring is sleeved on the whole core, therefore, compared with a mode of welding between the sleeve and the whole core, the O-shaped sealing ring is easy to be arranged in a large number, the sleeving speed can be increased, in addition, in the buckling process, the threaded connection is compared with the welding, cracks can not appear, therefore, after the buckling is completed, the flaw detection is not needed again, and the working efficiency is improved.
5. The outer wall of the whole core is provided with a first inverted tooth structure, and the inner wall of the sleeve is provided with a second inverted tooth structure; therefore, when the pipeline to be connected between the two is buckled and pressed, the through core and the sleeve are further tightened, and the connection strength and the sealing performance are improved.
6. The utility model provides a first straight section of thick bamboo section, frustum section and the straight section of thick bamboo section of second are integrated into one piece, then are withholding the in-process, and it extends more evenly, the phenomenon of rupture can not appear.
Drawings
Fig. 1 is a schematic structural view of a threaded connection type pipe joint of the present invention;
fig. 2 is an enlarged view of a in fig. 1.
Reference numerals:
1-a whole core, 11-a first inverted tooth structure, 12-a high step, 13-a middle step, 14-a low step, 15-a fastening limit groove and 16-an engagement surface;
2-a sleeve, 21-a first straight cylinder section, 22-a frustum section, 23-a second straight cylinder section and 24-a second inverted tooth structure;
3-O type sealing ring.
Detailed Description
To make the objects, advantages and features of the present invention clearer, a pipe joint of a screw connection type according to the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following detailed description. It should be noted that: the drawings are in a very simplified form and are not to precise scale, and are provided solely for the purpose of facilitating and distinctly aiding in the description of the embodiments of the present invention; second, the structures shown in the drawings are often part of actual structures.
The utility model relates to a screw connection type pipe joint, as shown in figure 1, which comprises a whole core 1 and two sleeves 2 respectively sleeved at two ends of the whole core; the outer wall of the middle part of the whole core 1 is provided with an annular fastening limiting groove 15 for buckling; the annular fastening limiting groove 15 can limit the buckling equipment, so that the buckling position is accurate;
the distance between the whole-body core 1 and the sleeve 2 is matched with the wall thickness of a pipeline to be connected.
As shown in fig. 2, the sleeve 2 includes a first straight cylinder section 21, a frustum section 22 and a second straight cylinder section 23 which are coaxially connected in sequence and integrally formed, the large end of the frustum section 22 is connected with the first straight cylinder section 21, and the small end thereof is connected with the second straight cylinder section 23; the inner wall of the second straight cylinder section 23 is provided with internal threads.
Two ends of the peripheral surface of the whole core 1 are provided with annular steps; the annular steps comprise a high step 12, a middle step 13 and a low step 14 which are sequentially arranged from the center of the whole core 1 to two ends; the middle step 13 is provided with an external thread matched with the internal thread; this external screw thread is close to high step 12 setting for the terminal surface of second straight section of thick bamboo section 23 can lean on tightly each other with the face 16 that links up between high step 12 and the well step 13, reduces the damage of withholding in-process internal thread and external screw thread, in order to further reduce the screw thread damage, the utility model discloses well foretell internal thread all sets up to trapezoidal thread with the external screw thread.
In order to ensure that the connection between the whole core 1 and the sleeve 2 is more compact and reliable after the buckling, the utility model adopts a labyrinth seal structure between the end surface of the second straight cylinder section 23 and the joining surface 16; the labyrinth seal structure specifically comprises: a first annular groove and a first annular bulge are arranged on the end surface of the second straight cylinder section 23; the engagement surface 16 is provided with a second annular protrusion adapted to the first annular groove and a second annular groove adapted to the first annular protrusion. Therefore, in the buckling process, the first annular protrusion and the second annular groove are clamped in a concave-convex mode and extend simultaneously, the second annular protrusion and the first annular groove are clamped in a concave-convex mode and extend simultaneously, and the connection result is more reliable.
The low step 14 is provided with a first inverted tooth structure 11; a second inverted tooth structure 24 is arranged on the inner wall of the first straight cylinder section 21; in order to improve the connection sealing performance, two O-shaped sealing rings 3 are respectively sleeved on the two low steps 14 at the two ends.
The utility model discloses a coupling with when treating connecting tube and connecting, treat earlier that connecting tube tip inserts sleeve 2 in two, will be equipped with the whole body core 1 of O type sealing washer again and insert and treat the connecting tube hole, connect sleeve 2 screw thread soon on whole body core 1 again. And reducing the diameter of the sleeve to a specified size by using special buckling and pressing (pipe reducing) equipment to realize connection.
According to the invention, through the thread structure design of the sleeve 2 and the through core 1 of the pipe joint, the original welding process connection of the core pipe and the sleeve of the integrated pipe joint is changed into thread connection, so that the nondestructive testing procedure is omitted, the O-shaped sealing ring is more convenient to install, the sleeve and the common joint can be used universally, and the inventory cost is saved.
Claims (8)
1. A threaded connection type pipe joint comprises a whole core (1) and two sleeves (2) which are respectively sleeved at two ends of the whole core (1); the gap between the outer surface of the through core (1) and the inner surface of the sleeve (2) is matched with the wall thickness of the pipeline to be connected;
the method is characterized in that:
the outer peripheral surfaces of two ends of the whole core (1) are provided with annular steps;
the annular steps comprise a high step (12), a middle step (13) and a low step (14) which are sequentially arranged from the center of the whole core (1) to two ends;
the middle step (13) is provided with an external thread, and the external thread is arranged close to the high step (12);
the sleeve (2) comprises a first straight cylinder section (21), a frustum section (22) and a second straight cylinder section (23) which are coaxially connected in sequence;
the large end of the frustum section (22) is connected with the first straight cylinder section (21), and the small end of the frustum section is connected with the second straight cylinder section (23); the inner wall of the second straight cylinder section (23) is provided with internal threads;
the second straight cylinder section (23) is in threaded connection with the middle step (13), and the end face of the second straight cylinder section (23) is tightly attached to the connecting face (16) between the high step (12) and the middle step (13);
a labyrinth seal structure is arranged between the second straight cylinder section (23) and the joint surface (16).
2. A threaded connection pipe coupling according to claim 1, wherein:
a first annular groove and a first annular bulge are arranged on the end surface of the second straight cylinder section (23);
the joint surface (16) is provided with a second annular bulge matched with the first annular groove and a second annular groove matched with the first annular bulge.
3. A threaded connection pipe coupling according to claim 1 or 2, wherein:
the internal thread and the external thread are both right-angle trapezoidal threads.
4. A threaded connection pipe coupling according to claim 3, wherein:
the outer wall of the whole core (1) is provided with a first pawl structure (11);
and a second inverted tooth structure (24) is arranged on the inner wall of the sleeve.
5. A threaded connection pipe coupling according to claim 4, wherein:
the first inverted tooth structure (11) is arranged on the low step (14);
the second inverted tooth structure (24) is arranged on the inner wall of the first straight cylinder section (21).
6. A threaded connection pipe coupling according to claim 1, wherein:
the low step (14) is sleeved with an O-shaped sealing ring (3).
7. A threaded connection pipe coupling according to claim 1, wherein:
and the outer wall of the middle part of the whole core (1) is provided with an annular fastening limiting groove (15) for buckling.
8. A threaded connection pipe coupling according to claim 1, wherein:
the first straight cylinder section (21), the frustum section (22) and the second straight cylinder section (23) are integrally formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020637356.7U CN212107301U (en) | 2020-04-24 | 2020-04-24 | Threaded connection type pipe joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020637356.7U CN212107301U (en) | 2020-04-24 | 2020-04-24 | Threaded connection type pipe joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212107301U true CN212107301U (en) | 2020-12-08 |
Family
ID=73611946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020637356.7U Ceased CN212107301U (en) | 2020-04-24 | 2020-04-24 | Threaded connection type pipe joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212107301U (en) |
-
2020
- 2020-04-24 CN CN202020637356.7U patent/CN212107301U/en not_active Ceased
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| IW01 | Full invalidation of patent right |
Decision date of declaring invalidation: 20220428 Decision number of declaring invalidation: 55412 Granted publication date: 20201208 |
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| IW01 | Full invalidation of patent right |