Gas pipeline connecting structure
By designing a press-fit socket and press-fit sealing components, the problems of troublesome gas pipeline connections and safety hazards are solved, achieving convenient and safe gas pipeline connections and improving sealing effect and anti-detachment performance.
Patent Information
- Application Number
- CN202520564203.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-28
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-03-28
AI Technical Summary
Existing gas pipeline connection structures present both challenges and safety hazards, particularly during the welding process.
The gas main pipe and the incoming pipeline are connected by a press-fit socket and a press-fit sealing assembly, avoiding welding. The press-fit sealing assembly, which includes a combination of sealing rings and retaining rings, achieves circumferential sealing and fastening.
It achieves convenience and safety in gas pipeline connection, eliminates safety hazards in the welding process, and improves sealing reliability and anti-detachment performance.
Smart Images
Figure CN223869030U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pipeline connection structure technology, and more specifically, to a gas pipeline connection structure. Background Technology
[0002] Currently, the gas pipeline connection structure on the market includes a main gas pipe, an inlet pipe, a valve body, a first connecting fitting, and a second connecting fitting. One end of the first connecting fitting is pre-welded to a first flange, and one end of the second connecting fitting is pre-welded to a second flange. The other end of the first connecting fitting is welded to the outlet end of the main gas pipe and circumferentially sealed, while the other end of the second connecting fitting is welded to the inlet end of the inlet pipe and circumferentially sealed. The first and second flanges are respectively fixed to both ends of the valve body and circumferentially sealed. However, in this structure, because the other end of the first connecting fitting needs to be welded to the outlet end of the main gas pipe and circumferentially sealed, and the other end of the second connecting fitting needs to be welded to the inlet end of the inlet pipe and circumferentially sealed, there are drawbacks to the connection between the first and second connecting fittings. Furthermore, welding the first and second connecting fittings to the main gas pipe and the inlet pipe requires hot work, posing significant safety hazards. Utility Model Content
[0003] The technical problem to be solved by this utility model is to provide a gas pipeline connection structure that can facilitate the connection of gas pipelines and eliminate safety hazards.
[0004] This utility model provides a gas pipeline connection structure, including a gas main pipe, an inlet pipe, a valve body, a first connecting pipe fitting, and a second connecting pipe fitting. A first flange is pre-welded to one end of the first connecting pipe fitting, and a second flange is pre-welded to one end of the second connecting pipe fitting. The first and second flanges are respectively fixed to both ends of the valve body and circumferentially sealed. The other end of the first connecting pipe fitting is sleeved on the gas outlet end of the gas main pipe, and is press-fitted and circumferentially sealed to the gas outlet end of the gas main pipe. The other end of the second connecting pipe fitting is sleeved on the gas inlet end of the inlet pipe, and is press-fitted and circumferentially sealed to the gas inlet end of the inlet pipe.
[0005] By adopting the above structure, this utility model has the advantages of convenient connection between the first connecting pipe and the gas main pipe, and convenient connection between the second connecting pipe and the gas inlet pipe. In addition, no hot work is required during the connection of the first connecting pipe and the gas main pipe, and during the connection of the second connecting pipe and the gas inlet pipe.
[0006] In one possible implementation, both the other end of the first connecting pipe fitting and the other end of the second connecting pipe fitting form a press-fit socket. An annular groove is formed on the inner side of the press-fit socket, and a press-fit sealing component is embedded in the annular groove, axially limiting the press-fit sealing component with the annular groove. The press-fit socket located at the other end of the first connecting pipe fitting is used to fit onto the gas outlet end of the main gas pipe, and is press-fitted and circumferentially sealed to the gas outlet end of the main gas pipe by the press-fit sealing component at the corresponding position. The press-fit socket located at the other end of the second connecting pipe fitting is used to fit onto the gas inlet end of the inlet pipe, and is press-fitted and circumferentially sealed to the gas outlet end of the main gas pipe by the press-fit sealing component at the corresponding position. The gas inlet end of the inlet pipe is press-fitted and circumferentially sealed. With this structure, after the gas outlet end of the main gas pipe is inserted into the press-fit socket located at the other end of the first connecting pipe fitting, and after the press-fit socket is pressed by a press-fit tool, the press-fit sealing component located inside the press-fit socket can press-fit and circumferentially seal the gas outlet end of the main gas pipe. Similarly, after the gas inlet end of the inlet pipe is inserted into the press-fit socket located at the other end of the second connecting pipe fitting, and after the press-fit socket is pressed by a press-fit tool, the press-fit sealing component located inside the press-fit socket can press-fit and circumferentially seal the gas inlet end of the inlet pipe.
[0007] In one possible implementation, the press-fit sealing assembly includes a first sealing ring, a first toothed ring, and a first retaining ring, which are sequentially embedded in an annular groove from the inside out. The first retaining ring is made of polytetrafluoroethylene (PTFE). By employing this press-fit sealing assembly, after the press-fit socket is pressed by a press-fit tool, the teeth on the inner circumferential wall of the first toothed ring can engage with the outer wall of the gas main pipe or inlet pipe to achieve a tight seal between the gas main pipe and the first connecting fitting, and between the inlet pipe and the second connecting fitting. When subjected to radial compressive force, the inner circumferential walls of the first sealing ring and the first retaining ring can tightly seal against the outer circumferential wall of the gas main pipe or inlet pipe, thereby achieving a circumferential seal between the press-fit socket and the gas main pipe or inlet pipe. Simultaneously, the first sealing ring and the first retaining ring achieve a dual sealing effect, improving the reliability of the circumferential seal between the press-fit socket and the gas main pipe or inlet pipe.
[0008] In one possible implementation, the inner peripheral wall of the first sealing ring is provided with a plurality of first annular ribs spaced apart along the axial direction of the first sealing ring; by adopting this structure, under the action of the plurality of first annular ribs, the inner peripheral wall of the first sealing ring can be more reliably pressed against the outer peripheral wall of the gas main pipe or the outer peripheral wall of the inlet pipe, thereby improving the sealing effect.
[0009] In one possible implementation, the press-fit sealing assembly includes a second sealing ring, a second retaining ring, and a second toothed ring, which are sequentially embedded in an annular groove from the inside out. The second retaining ring is made of metal. By employing this press-fit sealing assembly, after the press-fit socket is pressed by a press-fit tool, the teeth on the inner circumferential wall of the second toothed ring can engage with the outer wall of the gas main pipe or inlet pipe to achieve a fastening of the gas main pipe to the first connecting fitting, and a fastening of the inlet pipe to the second connecting fitting. When the second sealing ring is subjected to radial compressive force, the inner circumferential wall of the second sealing ring can engage with the outer wall of the gas main pipe. The outer circumferential wall or the outer circumferential wall of the inlet pipe is tightly sealed, thereby achieving a circumferential seal between the press-fit socket and the gas main pipe or the inlet pipe. In addition, since the second retaining ring is made of metal, and after the second retaining ring is subjected to radial compressive force, the second retaining ring can engage with the outer circumferential wall of the gas main pipe or the inlet pipe, thereby further improving the anti-disengagement performance of the press-fit socket with the gas main pipe and the inlet pipe. Furthermore, when the second toothed ring engages with the outer circumferential wall of the gas main pipe or the inlet pipe, the second retaining ring can provide support for the second toothed ring, so as to prevent the second toothed ring from damaging the second sealing ring.
[0010] In one possible implementation, the inner peripheral wall of the second sealing ring is provided with a plurality of second annular ribs spaced apart along the axial direction of the second sealing ring; by adopting this structure, under the action of the plurality of second annular ribs, the inner peripheral wall of the second sealing ring can be more reliably pressed against the outer peripheral wall of the gas main pipe or the outer peripheral wall of the inlet pipe, thereby improving the sealing effect.
[0011] In one possible implementation, a first annular step is provided on the inner wall of the first connecting pipe fitting located axially inside the press-fit socket. The first annular step is used to abut against the gas outlet end of the gas main pipe. With this structure, after the gas outlet end of the gas main pipe is inserted into the other end of the first connecting pipe fitting, the gas outlet end of the gas main pipe can abut against the first annular step to achieve axial positioning of the gas main pipe and the first connecting pipe fitting, and to indicate to the construction personnel that the gas main pipe and the first connecting pipe fitting have been inserted in place.
[0012] In one possible implementation, a second annular step is provided on the inner wall of the second connecting pipe fitting located axially inside the crimp socket. The second annular step is used to abut against the air inlet end of the inlet pipe. With this structure, after the air inlet end of the inlet pipe is inserted into the other end of the second connecting pipe fitting, the air inlet end of the inlet pipe can abut against the second annular step to achieve axial positioning of the inlet pipe and the second connecting pipe fitting, and to indicate to the construction personnel that the inlet pipe and the second connecting pipe fitting have been inserted into place.
[0013] In one possible implementation, a cleaning port is provided on the side wall of the first connecting pipe, and a first plug is connected to the outer end of the cleaning port. With this structure, after the first plug is removed, the construction personnel can insert the cleaning tool into the first connecting pipe through the cleaning port to clean the inner cavity of the first connecting pipe and the gas main pipe. After cleaning, the first plug can be reinstalled on the outer end of the cleaning port.
[0014] In one possible implementation, a pressure testing port is provided on the side wall of the second connecting pipe, and a second plug is connected to the outer end of the pressure testing port. With this structure, after the second plug is removed and a pressure gauge is installed on the pressure testing port, the pressure of the gas in the second connecting pipe can be tested. If the pressure gauge is removed, the second plug can be reinstalled on the outer end of the pressure testing port. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of this utility model;
[0016] Figure 2 This is a cross-sectional view of the structure after the other end of the first connecting pipe is connected to the gas outlet of the main gas pipe.
[0017] Figure 3 for Figure 2 A magnified structural diagram of point A in the middle;
[0018] Figure 4 This is a cross-sectional view of the structure after the other end of the second connecting pipe is connected to the air inlet end of the inlet pipe.
[0019] Figure 5 for Figure 4 A magnified structural diagram of section B. Detailed Implementation
[0020] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.
[0021] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.
[0022] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0023] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.
[0024] Example 1
[0025] See Figure 1 , Figure 4 and Figure 5 As shown in the figure, this application discloses a gas pipeline connection structure, including a gas main pipe 1, an inlet pipe 2, a valve body 3, a first connecting fitting 4, and a second connecting fitting 5; one end of the first connecting fitting 4 is pre-welded and fixed with a first flange 41, and one end of the second connecting fitting 5 is pre-welded and fixed with a second flange 51. The first flange 41 and the second flange 51 are respectively fixed to both ends of the valve body 3 and circumferentially sealed; the other end of the first connecting fitting 4 is sleeved on the gas outlet end of the gas main pipe 1, and the other end of the first connecting fitting 4 is pressed and fixed to the gas outlet end of the gas main pipe 1 and circumferentially sealed; the other end of the second connecting fitting 5 is sleeved on the gas inlet end of the inlet pipe 2, and the other end of the second connecting fitting 5 is pressed and fixed to the gas inlet end of the inlet pipe 2 and circumferentially sealed; the valve body is a pressure reducing valve or other valve body type.
[0026] Both the other end of the first connecting pipe fitting 4 and the other end of the second connecting pipe fitting 5 form a press-fit socket 6. An annular groove 61 is formed on the inner side of the press-fit socket 6, and a press-fit sealing component is embedded in the annular groove 61, axially limiting the press-fit sealing component and the annular groove 61. The press-fit socket 6 located at the other end of the first connecting pipe fitting 4 is used to fit onto the gas outlet end of the gas main pipe 1, and is press-fitted and circumferentially sealed to the gas outlet end of the gas main pipe 1 by the press-fit sealing component at the corresponding position. The press-fit socket 6 located at the other end of the second connecting pipe fitting 5 is used to fit onto the gas inlet end of the inlet pipe 2, and is sealed circumferentially by the press-fit sealing component at the corresponding position. The fitting is press-fitted and circumferentially sealed to the gas inlet end of the inlet pipe 2. With this structure, after the gas outlet end of the gas main pipe is inserted into the press-fit socket located on the other end of the first connecting pipe fitting, and after the press-fit socket is pressed by a press-fit tool, the press-fit sealing component located inside the press-fit socket can press-fit and circumferentially seal the gas outlet end of the gas main pipe. Similarly, after the gas inlet end of the inlet pipe is inserted into the press-fit socket located on the other end of the second connecting pipe fitting, and after the press-fit socket is pressed by a press-fit tool, the press-fit sealing component located inside the press-fit socket can press-fit and circumferentially seal the gas inlet end of the inlet pipe.
[0027] The press-fit sealing assembly includes a first sealing ring 71, a first toothed ring 72, and a first retaining ring 73, which are sequentially embedded in an annular groove 61 from the inside out. The first retaining ring 73 is made of polytetrafluoroethylene. By using this press-fit sealing assembly, after the press-fit socket is pressed by a press-fit tool, the teeth on the inner circumferential wall of the first toothed ring can engage with the outer wall of the gas main pipe or the inlet pipe to achieve the fastening of the gas main pipe to the first connecting pipe fitting and the inlet pipe to the second connecting pipe fitting. After being subjected to radial compressive force, the inner circumferential walls of the first sealing ring and the first retaining ring can tightly seal against the outer circumferential wall of the gas main pipe or the inlet pipe, thereby achieving a circumferential seal between the press-fit socket and the gas main pipe or the inlet pipe. At the same time, the first sealing ring and the first retaining ring can achieve a double sealing effect to improve the reliability of the circumferential seal between the press-fit socket and the gas main pipe or the inlet pipe.
[0028] The inner peripheral wall of the first sealing ring 71 is provided with a number of first annular ribs 711 that are spaced apart along the axial direction of the first sealing ring 71. With this structure, under the action of the number of first annular ribs, the inner peripheral wall of the first sealing ring can be more reliably pressed against the outer peripheral wall of the gas main pipe or the outer peripheral wall of the inlet pipe, so as to improve the sealing effect.
[0029] A first annular step 42 is provided on the inner wall of the first connecting pipe fitting 4 located inside the axial direction of the press-fit socket 6. The first annular step 42 is used to abut against the gas outlet end of the gas main pipe 1. With this structure, after the gas outlet end of the gas main pipe is inserted into the other end of the first connecting pipe fitting, the gas outlet end of the gas main pipe can abut against the first annular step to achieve axial positioning of the gas main pipe and the first connecting pipe fitting, and to indicate to the construction personnel that the gas main pipe and the first connecting pipe fitting have been inserted in place.
[0030] A second annular step 52 is provided on the inner wall of the second connecting pipe fitting 5 located inside the axial direction of the crimp socket 6. The second annular step 52 is used to abut against the air inlet end of the inlet pipe 2. With this structure, after the air inlet end of the inlet pipe is inserted into the other end of the second connecting pipe fitting, the air inlet end of the inlet pipe can abut against the second annular step to achieve axial positioning of the inlet pipe and the second connecting pipe fitting, and to indicate to the construction personnel that the inlet pipe and the second connecting pipe fitting have been inserted into place.
[0031] A cleaning port 43 is provided on the side wall of the first connecting pipe fitting 4, and a first plug 44 is connected to the outer end of the cleaning port 43. With this structure, after the first plug is removed, the construction personnel can insert the cleaning tool into the first connecting pipe fitting through the cleaning port to clean the inner cavity of the first connecting pipe fitting and the gas main pipe. After cleaning, the first plug can be put back on the outer end of the cleaning port.
[0032] A pressure testing port 53 is provided on the side wall of the second connecting pipe 5, and a second plug 54 is connected to the outer end of the pressure testing port 53. With this structure, after the second plug is removed and a pressure gauge is installed on the pressure testing port, the pressure of the gas in the second connecting pipe can be tested. If the pressure gauge is removed, the second plug can be reinstalled on the outer end of the pressure testing port.
[0033] Example 2
[0034] See Figure 2 and Figure 3As shown, unlike Embodiment 1, the press-fit sealing assembly includes a second sealing ring 81, a second retaining ring 82, and a second toothed ring 83, which are sequentially embedded in the annular groove 61 from the inside out. The second retaining ring 82 is made of metal. With this press-fit sealing assembly, after the press-fit socket is pressed by a press-fit tool, the teeth on the inner circumferential wall of the second toothed ring can engage with the outer wall of the gas main pipe or the inlet pipe to achieve the fastening of the gas main pipe to the first connecting fitting, and the fastening of the inlet pipe to the second connecting fitting. When the second sealing ring is subjected to radial compressive force, the inner circumferential wall of the second sealing ring can engage with... The outer circumferential wall of the gas main pipe or the inlet pipe is tightly sealed, thus achieving a circumferential seal between the press-fit socket and the gas main pipe or the inlet pipe. In addition, since the second retaining ring is made of metal, and after being subjected to radial compressive force, the second retaining ring can engage with the outer circumferential wall of the gas main pipe or the inlet pipe, further improving the anti-disengagement performance of the press-fit socket with the gas main pipe and the inlet pipe. Furthermore, when the second toothed ring engages with the outer circumferential wall of the gas main pipe or the inlet pipe, the second retaining ring can support the second toothed ring to prevent the second toothed ring from damaging the second sealing ring.
[0035] The inner circumferential wall of the second sealing ring 81 is provided with several second annular ribs 811 that are spaced apart along the axial direction of the second sealing ring 81. With this structure, under the action of several second annular ribs, the inner circumferential wall of the second sealing ring can be more reliably pressed against the outer circumferential wall of the gas main pipe or the outer circumferential wall of the inlet pipe, so as to improve the sealing effect.
[0036] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. A gas pipeline connection structure, comprising a gas main pipe (1), an inlet pipe (2), a valve body (3), a first connecting fitting (4), and a second connecting fitting (5); a first flange (41) is pre-welded to one end of the first connecting fitting (4), and a second flange (51) is pre-welded to one end of the second connecting fitting (5); the first flange (41) and the second flange (51) are respectively fixed to both ends of the valve body (3) and circumferentially sealed; characterized in that: The other end of the first connecting pipe (4) is sleeved on the gas outlet end of the gas main pipe (1), and the other end of the first connecting pipe (4) is clamped and fixed to the gas outlet end of the gas main pipe (1) and circumferentially sealed; the other end of the second connecting pipe (5) is sleeved on the gas inlet end of the inlet pipe (2), and the other end of the second connecting pipe (5) is clamped and fixed to the gas inlet end of the inlet pipe (2) and circumferentially sealed.
2. The gas pipeline connection structure according to claim 1, characterized in that: The other end of the first connecting pipe fitting (4) and the other end of the second connecting pipe fitting (5) are both formed with a press-fit socket (6). An annular groove (61) is formed on the inner side of the press-fit socket (6). A press-fit sealing component is embedded in the annular groove (61). The press-fit sealing component is axially limited by the annular groove (61). The press-fit socket (6) located on the other end of the first connecting pipe fitting (4) is used to fit onto the gas outlet end of the gas main pipe (1). It is pressed and fixed to the gas outlet end of the gas main pipe (1) by the press-fit sealing component at the corresponding position and is circumferentially sealed. The press-fit socket (6) located on the other end of the second connecting pipe fitting (5) is used to fit onto the gas inlet end of the inlet pipe (2). It is pressed and fixed to the gas inlet end of the inlet pipe (2) by the press-fit sealing component at the corresponding position and is circumferentially sealed.
3. The gas pipeline connection structure according to claim 2, characterized in that: The press-fit sealing assembly includes a first sealing ring (71), a first toothed ring (72), and a first retaining ring (73) sequentially embedded in an annular groove (61) from the inside out. The first retaining ring (73) is made of polytetrafluoroethylene material.
4. The gas pipeline connection structure according to claim 3, characterized in that: The inner peripheral wall of the first sealing ring (71) is provided with a number of first annular ribs (711) that are spaced apart along the axial direction of the first sealing ring (71).
5. The gas pipeline connection structure according to claim 2, characterized in that: The press-fit sealing assembly includes a second sealing ring (81), a second retaining ring (82), and a second toothed ring (83) sequentially embedded in an annular groove (61) from the inside out. The second retaining ring (82) is made of metal.
6. The gas pipeline connection structure according to claim 5, characterized in that: The inner circumferential wall of the second sealing ring (81) is provided with a number of second annular ribs (811) that are spaced apart along the axial direction of the second sealing ring (81).
7. The gas pipeline connection structure according to any one of claims 2-6, characterized in that: A first annular step (42) is provided on the inner wall of the first connecting pipe (4) located inside the axial direction of the press-fit socket (6). The first annular step (42) is used to abut against the gas outlet end of the gas main pipe (1).
8. The gas pipeline connection structure according to any one of claims 2-6, characterized in that: A second annular step (52) is provided on the inner wall of the second connecting pipe (5) located inside the axial direction of the crimping socket (6). The second annular step (52) is used to abut against the air inlet end of the inlet pipe (2).
9. The gas pipeline connection structure according to claim 1, characterized in that: A cleaning port (43) is provided on the side wall of the first connecting pipe (4), and a first plug (44) is connected to the outer end of the cleaning port (43).
10. The gas pipeline connection structure according to claim 1, characterized in that: The second connecting pipe (5) has a pressure test port (53) on its side wall, and a second plug (54) is connected to the outer end of the pressure test port (53).