CN113154147A - Fire-fighting pipeline connecting piece - Google Patents
Fire-fighting pipeline connecting piece Download PDFInfo
- Publication number
- CN113154147A CN113154147A CN202110128759.8A CN202110128759A CN113154147A CN 113154147 A CN113154147 A CN 113154147A CN 202110128759 A CN202110128759 A CN 202110128759A CN 113154147 A CN113154147 A CN 113154147A
- Authority
- CN
- China
- Prior art keywords
- cavity
- locking ring
- fire
- pipe body
- sealing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000007789 sealing Methods 0.000 claims abstract description 76
- 230000002093 peripheral effect Effects 0.000 claims description 18
- 238000005520 cutting process Methods 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 3
- 210000001503 joint Anatomy 0.000 claims description 3
- 230000007423 decrease Effects 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims 5
- 238000010168 coupling process Methods 0.000 claims 5
- 238000005859 coupling reaction Methods 0.000 claims 5
- 238000012856 packing Methods 0.000 claims 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- 238000003825 pressing Methods 0.000 abstract description 3
- 230000003068 static effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on, or into, one of the joint parts
- F16L19/02—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member
- F16L19/0212—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member using specially adapted sealing means
- F16L19/0218—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member using specially adapted sealing means comprising only sealing rings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on, or into, one of the joint parts
- F16L19/02—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member
- F16L19/0206—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member the collar not being integral with the pipe
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on, or into, one of the joint parts
- F16L19/02—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member
- F16L19/0237—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member specially adapted for use with attachments, e.g. reduction units, T-pieces, bends or the like
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
Abstract
A fire-fighting pipeline connecting piece comprises a straight pipe body, wherein external threads are formed at two ends of the straight pipe body, and an axial hollow pipe cavity for inserting two fire-fighting pipelines from two ends respectively to realize quick connection is formed inside the straight pipe body; a seal member embedded in the straight tube body; a pressure pad; the sealing element is arranged in an end cavity on the outer side of the hollow pipe cavity, the end cavity is an equal-diameter end cavity, the sealing element is a double-layer structure sealing element, an outer-layer structure layer is used for sealing a gap between the pipeline and the connecting element, and an inner-layer structure layer is used for sealing the pipeline in an annular connection mode by utilizing the static pressure of a water body in the connecting element. The locking ring is an elastic structure locking ring with a double-cone structure, the conical cavity of the external rotation nut is matched with the outer conical surface of the locking ring, and during use, axial force is transmitted to the pressing pad and the sealing element through the locking ring, so that the sealing element and the pipe body are sealed.
Description
Technical Field
The invention relates to a pipe connecting device for communicating the end parts of two adjacent pipes on a pipeline for conveying fluid, in particular to a fire-fighting pipeline connecting piece.
Background
The pipe connecting piece for connecting the ends of two adjacent pipes in life and production is a common part in fluid conveying facilities, and mainly comprises a pipe body for inserting the pipe ends of the two pipes to be connected, a sealing element and a sleeve or a fixing nut for fixing the pipe body and the pipe ends. The "pipe connection socket" disclosed in chinese patent CN107148529A includes a housing, i.e. a pipe body, wherein the inner peripheral surfaces of two ports of the housing are inclined surfaces, i.e. conical surfaces, and the outer peripheral surfaces are provided with external threads. The lock nut has an internal thread on its inner periphery that matches the thread of the housing and a tapered surface behind the thread. A liner with the outer peripheral surface matched with the conical surface is arranged in the end opening of the shell, an arm ring with the outer peripheral surface matched with the conical surface is arranged in the locking nut, and a gasket is arranged between the liner and the arm ring.
Disclosure of Invention
The invention provides a fire-fighting pipeline connecting piece which comprises a straight pipe body, wherein external threads are formed at two ends of the straight pipe body, and an axial hollow pipe cavity for inserting two fire-fighting pipelines from two ends respectively to realize quick connection is formed in the straight pipe body; a seal member embedded in the straight tube body; a pressure pad; a locking ring and external screw nut for locking fire-fighting pipeline, characterized by:
the inner axial hollow pipe cavity of the straight pipe body is an equal-diameter hollow pipe cavity, sealing piece pedestals are respectively arranged at the near end ports at the two ends of the hollow pipe cavity, the hollow pipe cavity between the two sealing piece pedestals is a butt joint space of the two fire fighting pipeline ports, namely an intermediate cavity, and the hollow pipe cavity from the sealing piece pedestals to the end ports of the straight pipe body is an equal-diameter end cavity;
the sealing element is a hollow cylindrical body, and the outer peripheral surface of the sealing element is matched with the inner peripheral surface of the end cavity;
the pressure pad is of an annular structure, and the outer diameter of the pressure pad is larger than the diameter of the end cavity and smaller than the diameter of the straight pipe body;
the locking ring is of a conical structure body, a columnar tube cavity is arranged inside the locking ring, and a through axial cutting groove is formed in the locking ring, so that the locking ring becomes an elastic structure locking ring which can be opened and closed under the action of external force;
the external rotation nut comprises a coaxial hollow cavity formed by a cylindrical cavity and a conical cavity, the circumferential wall of the cylindrical cavity is provided with an internal thread matched with the external thread at the end part of the straight tube body, and the conical surface of the conical cavity is coaxially matched with the conical surface of the conical body of the locking ring.
The fire-fighting pipeline connecting piece is characterized in that the wall of the pipe cavity of the locking ring is provided with annular locking grains.
The fire-fighting pipeline connecting piece is characterized in that the appearance of the locking ring is a symmetrical double-conical structure formed by connecting the bottoms of two conical bodies.
The fire-fighting pipeline connecting piece is characterized in that the sealing piece is a hollow columnar body with a double-layer structure, and the double-layer structure comprises an outer supporting sealing layer and an inner internal pressure sealing layer.
The fire-fighting pipeline connecting piece is characterized in that the supporting sealing layer is a cylindrical structural layer with the same thickness, the thickness of the internal pressure sealing layer is gradually reduced from bottom to top until the internal pressure sealing layer is extinguished, and the height of the internal pressure sealing layer is one third to two third of the height of the supporting sealing layer.
The fire-fighting pipeline connecting piece is characterized in that the inner circumferential surface and the outer circumferential surface of the internal pressure sealing layer are conical surfaces, and the lower part of the internal pressure sealing layer is provided with an annular groove.
The fire-fighting pipeline connecting piece is characterized in that the branching position between the internal pressure sealing layer and the supporting sealing layer is of a V-shaped structure or an approximate inverted pi-shaped structure.
According to the fire-fighting pipeline connecting piece, the cylindrical sealing cavities are arranged at the two ends of the straight pipe body and matched with the cylindrical sealing parts, so that the structure is simple, and the processing is convenient.
Drawings
FIG. 1 is a schematic view of a through connection configuration;
FIG. 2 is a sectional view A-A of FIG. 1;
FIG. 3 is a schematic illustration of a through connection application;
FIG. 4 is a schematic view of a straight tube;
FIG. 5 is a schematic view of a seal;
FIG. 6 is a cross-sectional view of the seal;
FIG. 7 is a view of another embodiment of a seal;
FIG. 8 is a schematic view of a locking ring;
FIG. 9 is a schematic view of an externally threaded nut;
FIG. 10 is a schematic view of a pressure pad construction;
FIG. 11 is an exploded view of a through connector;
fig. 12 is a schematic view of an inverted pi-shaped bifurcation structure.
In the drawings, 1-external screw nut; 2-locking ring; 3-a pressure pad; 4-a seal; 5-straight tube body; (ii) a 6-fire-fighting pipeline; 11-internal screw thread; 12-conical cavity cone; 21-cutting a groove; 22-locking ring grain; 23-a first cone; 24-a second cone; 41-internal pressure sealing layer; 42-supporting the sealing layer; 43-inner conical surface; 44-external conical surface; 45-annular groove; 46-the bifurcation position; 51-external threads; 52-seal stand; 53-middle chamber; 54-end chamber.
Detailed Description
As shown in fig. 1-3, the fire-fighting pipeline connecting piece of the invention is composed of a straight pipe body 5, a sealing element 4, a pressure pad 3, a locking ring 2 and an outward-turning nut 1. When the pipe fitting is used, the sealing elements 4 are placed into two ports of the straight pipe body, the locking ring 2 and the pressure pad 3 are sequentially placed into the external-rotation nut 1, the external-rotation nut is rotated to the end of the straight pipe body, the end of the straight pipe body is inserted into a fire pipeline 6 to be connected, and the external-rotation nut 1 is screwed to complete connection.
The construction and use of the invention are described in detail below with reference to figures 4-10. Since the two ends of the straight tube are symmetrical, the following embodiments will be alternatively described.
The straight pipe body 5 shown in fig. 4 is internally provided with an axial hollow pipe cavity with equal diameter or a cylindrical hollow pipe cavity, external threads 51 are symmetrically formed on the outer peripheral surface of two ends of the straight pipe body, sealing element pedestals 52 are respectively arranged at the near-end ports of the two ends of the hollow pipe cavity to divide the hollow pipe cavity into three sections, wherein the middle section is a middle cavity 53, the middle cavity is two butt joint spaces to be connected with a fire fighting pipeline, and end cavities 54 from the sealing element pedestals at two sides to the port positions are used for placing sealing elements and can also be called as sealing cavities. The ends of the two fire fighting pipes are inserted from both ends into the intermediate chamber 53 through the end chambers 54 and are in pipe communication therewith, although this need not be the physical connection of the two pipes, and it is primarily the fluid flowing through the two fire fighting pipes that can exit one pipe and enter the other pipe.
The sealing member 4 is a hollow cylindrical body made of rubber or other elastic material. The columnar outer peripheral surface of the sealing element is matched with the inner peripheral surface of the end cavity, but a small gap is reserved, so that the sealing element can be conveniently and smoothly placed in the end cavity in the actual operation process of quick connection, and the height of the sealing element is slightly higher than that of the end cavity by 1-2 mm.
In another embodiment of the seal of the present invention, shown in fig. 5-7, the seal is designed as a double-layer hollow cylinder, wherein the outer structural layer is the supporting sealing layer 42, which is the skeleton of the entire seal and is structurally characterized by the shape of a hollow cylinder with the same wall thickness throughout. When the external screw nut 1 is screwed, the sealing piece supporting and sealing layer is compressed to seal the gap between the sealing piece and the end cavity.
The inner ring structure layer of the sealing element is an internal pressure sealing layer 41. As shown in fig. 6, the thickness of the inner pressure seal layer 41 gradually decreases from the bottom to the top, and the height of the inner pressure seal layer does not exceed one third to two thirds of the height of the support seal layer.
Both the inner and outer peripheral surfaces of the internal pressure seal layer shown in FIG. 6 are tapered surfaces. When an external pipeline penetrates through the sealing element and is inserted into the middle cavity 53 of the pipe body in a working state, the internal pressure sealing layer is closely and annularly connected with the outer surface of the fire-fighting pipeline according to design requirements, and when high-pressure fluid passes through the fire-fighting pipeline, water pressure in the middle cavity of the pipe body acts on the outer peripheral surface of the internal pressure sealing layer, so that the inner peripheral surface of the internal pressure sealing layer is tightly attached to the outer wall of the pipeline to generate a sealing effect, and a gap between the inner peripheral surface and the outer peripheral surface is sealed, and the sealing effect is achieved.
In another embodiment of the seal shown in fig. 7, the lower portion of the inner pressure-tight seal layer has an annular groove 45, so that when the seal is subjected to axial pressure from the external nut, the axial force is not transmitted to the upper portion of the inner pressure-tight seal layer due to the annular groove, and the close annular joint of the inner pressure-tight seal layer and the surface of the inserted fire-fighting pipeline is prevented from being damaged. The connecting surface between the bottom of the internal pressure sealing layer and the supporting sealing layer is designed to be an arc surface, the curvature of the arc surface is very small as shown on a section, and the function of the connecting piece is that an inserted pipeline can smoothly enter a hole in the connecting piece in the process of quick connection without accurate centering. Meanwhile, the arc-shaped surface structure can also reduce the influence of external axial force on the internal pressure sealing layer.
The outer wall of the supporting seal layer shown in fig. 7 is slightly inclined, i.e. the outer circumferential surface of the supporting seal layer is a tapered surface with a small taper. Therefore, the sealing gasket can be smoothly arranged in the end cavity in the quick connection operation process, the quick installation or disassembly is prevented from being influenced by the static matching effect of the outer layer surface and the inner wall of the pipe body, and meanwhile, the sealing between the outer wall of the supporting sealing layer and the wall of the end cavity cannot be influenced due to small taper.
The diverging position 46 of the inner pressure containment layer and the support containment layer in fig. 7 is a V-shaped configuration, while the diverging position in fig. 6 is an inverted Π -shaped configuration.
As shown in fig. 10, the pressure pad 3 is a hollow oblate shape, i.e. an oblate ring structure, the outer diameter of the pressure pad is larger than the diameter of the end cavity and smaller than the diameter of the straight pipe body, in the working state, the pressure pad separates the sealing element 4 from the locking ring 2, the axial pressure from the external rotation nut acts on the pressure pad 3 through the locking ring and is transmitted to the sealing element, and the sealing element compresses and expands to seal the end cavity.
The locking ring 2 shown in fig. 8 has a conical shape, a cylindrical tube cavity inside, and locking ring patterns 22 on the wall of the tube cavity. The locking ring is provided with a through axial cutting groove 21 so that the locking ring has the property of an elastomer, when the peripheral surface of the outer conical surface of the locking ring is extruded by the screwing action force of the outward-turning nut 1, the diameter of the columnar pipe cavity is reduced, the fire pipeline extending into the straight pipe body is hooped, and the clamping effect on the surface of the fire pipeline can be enhanced by the locking ring grains 22 on the wall of the columnar pipe cavity. After the outward-turning nut 1 is loosened, the extrusion force acting on the locking ring is eliminated, the locking ring is restored to the original state, and the fire-fighting pipeline can be inserted and pulled.
Furthermore, the locking ring 2 is designed into a double-cone structure, and the bottom surfaces of the two cones are superposed to form a locking ring with the double-cone structure and the double-cone structure is symmetrical with the bottom surfaces of the cones in appearance. Fig. 8 shows a first cone 23 and a second cone 24. When in use, the peripheral surface of any cone can be matched with the conical cavity conical surface 12 of the external screw nut, the port of the other cone is aligned with the middle pressing pad 3, and the extrusion force from the external screw nut is transmitted to the sealing element 4 through the pressing pad.
As shown in fig. 9, the external screw nut 1 has a hollow structure and a polygonal structure outside, so as to facilitate the screwing operation of the tool. The extending part of the multi-edge structure is a conical structure, wherein the hollow inner cavity of the multi-edge structure is cylindrical, and the wall of the inner cavity is provided with internal threads 11 matched with the external threads 51 of the straight pipe body. The hollow inner cavity of the conical structural body is a smooth conical cavity, and the conical inner cavity surface is matched with the outer conical surface of the locking ring 2.
Fig. 11 shows a disassembly structure of the fire fighting pipeline connector according to the present invention, wherein the through connector has a symmetrical structure, and the assembly sequence of the combined structural members on one side of the straight pipe body is shown in the figure. The sealing element 4 is arranged in the end cavity of the straight pipe body 5 and sequentially comprises a pressure pad 3, a locking ring 2 and an outward-turning nut 1.
In the using state, the fire fighting pipeline to be connected is inserted from two ends of the straight pipe body and is connected in the middle cavity of the straight pipe body or is communicated through the middle cavity without direct contact, and in the process of screwing the external screw nut 1, the locking ring 2 is compressed in diameter under the radial force extrusion state to clamp and tighten the fire fighting pipeline. Meanwhile, the axial force generated by the outward-turning nut is transmitted to the sealing element 4 through the locking ring 2 and the pressure pad 3, and the sealing element is pressed, deformed and expanded to completely seal a gap between the circumferential surface of the end cavity and the outer circumferential surface of the sealing element. When high-pressure water flows through the pipeline, the water pressure in the middle cavity is increased to generate pressure on the outer conical surface of the inner pressure sealing layer of the sealing element 4, so that the inner pressure sealing layer is uniformly clamped on the surface of the pipeline, and a gap between the inner pressure sealing layer and the outer conical surface is sealed, thereby achieving the purpose of sealing.
Claims (8)
1. A fire-fighting pipeline connecting piece comprises a straight pipe body (5), wherein external threads (51) are formed at two ends of the straight pipe body, and an axial hollow pipe cavity for inserting two fire-fighting pipelines (6) from two ends to realize quick connection is formed inside the straight pipe body; a seal (4) embedded in the straight tube; a pressure pad (3); a locking ring (2) and external screw nut (1) for locking fire-fighting pipeline, characterized by:
the inner axial hollow pipe cavity of the straight pipe body (5) is an equal-diameter hollow pipe cavity, sealing piece pedestals (52) are respectively arranged at the positions close to the ports of the two ends of the hollow pipe cavity, the hollow pipe cavity between the two sealing piece pedestals is a butt joint space of the ports of the two fire pipelines, namely an intermediate cavity (53), and the hollow pipe cavity from the sealing piece pedestals to the end position of the straight pipe body is an equal-diameter end cavity (55);
the sealing element (4) is a hollow cylindrical body, and the outer peripheral surface of the sealing element is matched with the inner peripheral surface of the end cavity;
the pressure pad (3) is of an annular structure, and the outer diameter of the pressure pad is larger than the diameter of the end cavity and smaller than the diameter of the straight pipe body;
the locking ring (2) is a conical structure body in appearance, a columnar tube cavity is formed inside the locking ring, and a through axial cutting groove (21) is formed in the locking ring, so that the locking ring is an elastic structure locking ring which can be opened and closed under the action of external force;
the external-rotation nut (1) comprises a coaxial hollow cavity formed by a cylindrical cavity and a conical cavity, the circumferential wall of the cylindrical cavity is provided with an internal thread (11) matched with the external thread at the end part of the straight tube body, and the conical surface of the conical cavity is coaxially matched with the conical surface of the conical body of the locking ring.
2. The fire service coupling according to claim 1, wherein the locking ring (2) has an annular locking thread (22) on the wall of the lumen.
3. A fire-fighting pipeline connecting piece according to claim 1 or 2, wherein the locking ring has a symmetrical double-tapered shape formed by connecting the bottoms of two cones.
4. A fire service coupling according to claim 3, characterised in that the sealing member (4) is a hollow cylinder of double construction comprising an outer support seal (42) and an inner internal pressure seal (41).
5. The fire service coupling of claim 4, wherein the supporting seal (42) is a cylindrical structural layer of equal thickness, the thickness of the inner pressure seal (41) decreases from bottom to top and tapers to a point, and the height of the inner pressure seal is one-third to two-third of the height of the supporting seal.
6. The fire service coupling according to claim 4 or 5, wherein the inner and outer circumferential surfaces of the inner pressure-tight layer (41) are conical surfaces, and the lower portion of the inner pressure-tight layer is provided with an annular groove (45).
7. The fire service coupling of claim 4 or claim 5, wherein the bifurcation (46) between the inner pressure packing layer and the support packing layer is a V-shaped configuration or a substantially inverted Π -shaped configuration.
8. The fire hose connection according to claim 6, wherein the bifurcation (46) between the inner pressure packing and the support packing is a V-shaped configuration or a substantially inverted pi-shaped configuration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110128759.8A CN113154147A (en) | 2021-01-29 | 2021-01-29 | Fire-fighting pipeline connecting piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110128759.8A CN113154147A (en) | 2021-01-29 | 2021-01-29 | Fire-fighting pipeline connecting piece |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113154147A true CN113154147A (en) | 2021-07-23 |
Family
ID=76879123
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110128759.8A Pending CN113154147A (en) | 2021-01-29 | 2021-01-29 | Fire-fighting pipeline connecting piece |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113154147A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2100543U (en) * | 1991-06-03 | 1992-04-01 | 杨鸿宾 | Pressure sealed pipe coupler |
| JP2001021042A (en) * | 1999-07-07 | 2001-01-26 | Riken Corp | Mechanical pipe fittings |
| CN201306543Y (en) * | 2008-11-07 | 2009-09-09 | 宁波维蒙圣菲农业机械有限公司 | Seal ring |
| CN102047023A (en) * | 2008-06-30 | 2011-05-04 | 株式会社天实库 | Pipe joint for plastic resin pipe |
| CN216479430U (en) * | 2021-01-29 | 2022-05-10 | 山西容晟玛钢有限公司 | Fire-fighting pipeline connecting piece |
-
2021
- 2021-01-29 CN CN202110128759.8A patent/CN113154147A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2100543U (en) * | 1991-06-03 | 1992-04-01 | 杨鸿宾 | Pressure sealed pipe coupler |
| JP2001021042A (en) * | 1999-07-07 | 2001-01-26 | Riken Corp | Mechanical pipe fittings |
| CN102047023A (en) * | 2008-06-30 | 2011-05-04 | 株式会社天实库 | Pipe joint for plastic resin pipe |
| CN201306543Y (en) * | 2008-11-07 | 2009-09-09 | 宁波维蒙圣菲农业机械有限公司 | Seal ring |
| CN216479430U (en) * | 2021-01-29 | 2022-05-10 | 山西容晟玛钢有限公司 | Fire-fighting pipeline connecting piece |
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