CN211059578U

CN211059578U - G thread sealing structure

Info

Publication number: CN211059578U
Application number: CN201921595095.0U
Authority: CN
Inventors: 王世忠; 袁培荣; 俞尚锟; 詹泽锋
Original assignee: Ningbo Airtac Automatic Industrial Co ltd
Current assignee: Ningbo Airtac Automatic Industrial Co ltd
Priority date: 2019-09-24
Filing date: 2019-09-24
Publication date: 2020-07-21
Anticipated expiration: 2029-09-24

Abstract

The utility model discloses a G thread sealing structure, including coupling and connecting portion, the coupling is equipped with G tooth external screw thread, connecting portion be equipped with G tooth external screw thread complex G tooth internal thread, the coupling is equipped with sealed conical surface at G tooth external screw thread root, sealed conical surface is to the toper of G tooth external screw thread shrink, be equipped with sealed the pad on the sealed conical surface, the sealed lateral surface of filling up is close to the sealed cooperation of one end of coupling with G tooth internal thread. The utility model aims at providing a lower, the reliable G thread sealing structure of sealed effect of manufacturing cost.

Description

G thread sealing structure

Technical Field

The utility model belongs to pipe thread seal field especially relates to a G thread seal structure.

Background

At present, pipe joints are widely used in pressure systems for sealing between pipes. The pipe joint is usually provided with external threads, corresponding connecting objects are provided with internal threads, and the external threads and the internal threads are in threaded fit connection. As disclosed in chinese patent publication No.: a two-segment thread sealing structure for pipe is disclosed, which features that the external thread on the pipe joint has a conic surface, the internal thread matched with external thread segment is arranged on the object to be connected, and the thread and surface are matched. However, such a thread is relatively complex in machining process and difficult to ensure precision, so that the manufacturing cost is high and poor sealing is easily caused by matching precision errors.

SUMMERY OF THE UTILITY MODEL

The utility model relates to an overcome among the prior art not enough, provide a lower, the reliable G thread sealing structure of sealed effect of manufacturing cost.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a G thread sealing structure, includes coupling and connecting portion, the coupling is equipped with G tooth external screw thread, connecting portion be equipped with G tooth external screw thread complex G tooth internal thread, the coupling is equipped with sealed conical surface at G tooth external screw thread root, sealed conical surface is the toper to G tooth external screw thread shrink, be equipped with sealed the pad on the sealed conical surface, sealed lateral surface and the sealed cooperation of one end that is close to the coupling of G tooth internal thread of filling up. When the pipe joint is matched with the connecting part, the G thread external thread of the pipe joint and the G thread internal thread of the connecting part are screwed to form surface-to-surface contact, the locking of the threads is ensured not to be loosened, the top surface and the bottom surface of the threads are cylindrical surfaces, the requirement on the thread machining precision is lowered, and the production cost can be effectively lowered. Meanwhile, the sealing gasket on the sealing conical surface is tightly attached to the end part of the internal thread of the G tooth, so that the pipe joint and the connecting part are kept in a sealing state, and a good sealing effect is achieved.

Preferably, after the G thread and the G thread are screwed together, a gap of 1.5 to 2 threads is formed between the sealing conical surface and the end surface of the G thread, and the sealing gasket is filled in the gap. Like this, before G tooth internal thread and G tooth external thread are screwed, with sealed the locating in the space of filling up, along with rotatory process of screwing up, sealed the filling up also compresses tightly sealedly with coupling, connecting portion simultaneously, is favorable to guaranteeing the location accuracy, and the installation is also comparatively convenient.

Preferably, the inner side surface and the outer side surface of the sealing gasket are respectively provided with a convex rib, and the convex height of the convex rib is 10% -15% of the thickness of the sealing gasket. The convex ribs enhance the thickness of the stress part of the sealing gasket, can effectively improve the wear resistance and tear resistance of the sealing gasket, and improve the use times of the sealing gasket.

Preferably, the ratio of the axial length of the sealing cone to the axial length of the G-thread external thread is 3: 7. In the process of screwing the pipe joint, the sealing gasket is compressed through the sealing conical surface, and the proper length ratio of the sealing conical surface to the external thread of the G thread is set, so that the sealing gasket does not occupy extra space, and the whole structure is more compact.

Preferably, the included angle between the sealing gasket and the axial direction of the pipe joint after the sealing gasket is attached and sealed with the sealing conical surface is 15-25 degrees. When the sealing gasket is compressed by the sealing conical surface, the sealing between the sealing gasket and the connecting part is ensured, and certain locking force can be provided.

The utility model has the advantages that: (1) the G thread is convenient to machine and form, and thread sealant does not need to be precoated during installation, so that the production efficiency is improved; (2) the locking and sealing can be completed by using smaller fastening force, the sealing element is reliable in sealing and can be repeatedly used, and the convenience in use and installation is improved; (3) two groups of surface-to-surface contact seals formed by the internal threads and the external threads can effectively deal with extreme environments such as high pressure, vibration, long-time use and the like, and are stable and reliable in the use process; (4) the sealing gasket does not occupy extra space, the external thread of the G teeth has smaller appearance than the similar products, and materials and installation space can be saved.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic structural view of the pipe joint of the present invention;

fig. 3 is a schematic structural diagram of the gasket of the present invention.

In the figure: the pipe joint comprises a pipe joint 1, a G thread external thread 1a, a sealing conical surface 1b, a connecting part 2, a G thread internal thread 2a, a sealing gasket 3 and a convex rib 3 a.

Detailed Description

The invention is further described with reference to the accompanying drawings and the detailed description.

In the embodiment shown in fig. 1, a G-thread sealing structure comprises a pipe joint 1 and a connecting portion 2, wherein the pipe joint 1 comprises an external thread section and a sealing section which are coaxially arranged, the external thread section is provided with a G-thread external thread 1a, and the connecting portion 2 is provided with a G-thread internal thread 2a matched with the G-thread external thread 1 a. Referring to fig. 2, the sealing section is located at the root of the G-thread external thread 1a, the sealing section is provided with a sealing conical surface 1b, and the axial length ratio of the sealing conical surface 1b to the G-thread external thread 1a is 3: 7. The sealing conical surface 1b is in a conical shape which shrinks towards the G-thread external thread 1a, and the included angle between the sealing gasket 3 and the axial direction of the pipe joint 1 after the sealing gasket is attached and sealed with the sealing conical surface 1b is 15-25 degrees.

Be equipped with sealed pad 3 on the sealed conical surface 1b, the sealed conical surface 1b of the back of closing with G tooth external screw thread 1a soon and form the space of 1.5 to 2 teeth between the terminal surface of G tooth internal screw thread 2a and G tooth internal screw thread 2a, sealed pad 3 is filled in the space, sealed lateral surface and the sealed one end that 2a of tooth internal screw thread 2a are close to coupling 1 of filling up 3 are sealed the cooperation. Referring to fig. 3, the inner side surface and the outer side surface of the gasket 3 are respectively provided with a rib 3a, and the protruding height of the rib 3a is 10% -15% of the thickness of the gasket 3.

In the actual installation process, the sealing gasket 3 is sleeved on the sealing conical surface 1b of the pipe joint 1, the G thread external thread 1a of the pipe joint 1 and the G thread internal thread 2a of the connecting part 2 are relatively screwed, and the G thread external thread 1a and the G thread internal thread 2a are screwed to form surface-to-surface contact. After the pipe joint 1 is screwed, the sealing gasket 3 is tightly pressed with the sealing conical surface 1b and one end of the G-thread internal thread 2a close to the sealing conical surface 1b, so that sealing fit between the G-thread external thread 1a and the G-thread internal thread 2a is realized. Meanwhile, after the sealing gasket 3 is pressed, a certain locking force is provided between the pipe joint 1 and the connecting part 2, and a locking effect is achieved, so that the screw thread sealing glue does not need to be precoated during installation.

Claims

1. The utility model provides a G thread sealing structure, includes coupling (1) and connecting portion (2), characterized by, coupling (1) is equipped with G tooth external screw thread (1 a), connecting portion (2) are equipped with G tooth external screw thread (1 a) complex G tooth internal thread (2 a), coupling (1) is equipped with sealed conical surface (1 b) at G tooth external screw thread (1 a) root, sealed conical surface (1 b) is the toper to G tooth external screw thread (1 a) shrink, be equipped with sealed pad (3) on sealed conical surface (1 b), the lateral surface of sealed pad (3) and the one end seal cooperation that G tooth internal screw thread (2 a) are close to coupling (1).

2. The G thread sealing structure according to claim 1, wherein a gap of 1.5 to 2 threads is formed between the sealing conical surface (1 b) and the end surface of the G thread internal thread (2 a) after the G thread internal thread (2 a) and the G thread external thread (1 a) are screwed together, and the sealing gasket (3) is filled in the gap.

3. A G-thread sealing structure according to claim 1, wherein the inner side surface and the outer side surface of the gasket (3) are respectively provided with a rib (3 a), and the protruding height of the rib (3 a) is 10% to 15% of the thickness of the gasket (3).

4. A G-thread sealing arrangement according to claim 1, 2 or 3, wherein the ratio of the axial length of the sealing cone (1 b) to the G-thread (1 a) is 3: 7.

5. A G-thread sealing structure according to claim 1, 2 or 3, wherein the angle between the sealing gasket (3) and the axial direction of the pipe joint (1) after the sealing gasket (3) is attached and sealed with the sealing conical surface (1 b) is 15 ° to 25 °.