Pipe coupling and pipe system

Abstract

The utility model relates to the technical field of pipe fitting, disclose pipeline connecting pipe fitting and pipeline system. Pipeline connecting pipe fitting, including core, connecting sleeve, tightening sleeve, clamp and indicator, tightening sleeve includes the positioning end, force part and connecting end that set up in proper order along the axial direction, the outer wall of core is provided with annular clamping groove, tightening sleeve is sleeved in the outside of core, and the positioning end is clamped in annular clamping groove, the outer wall of connecting end is provided with two installation short pipes in the same direction, connecting sleeve is provided with two through -holes in the same direction, the indicator is arc plate shape, the position of the indicator close to its opposite two ends is provided with two groups of card convex pieces that are symmetrical, two installation short pipes pass through two through -holes one -one correspondence, two groups of card convex pieces can be one -one correspondence clamped in two installation short pipes, realize that the indicator buckles and set in the surface of connecting sleeve. The cooperation setting of the indicator and connecting sleeve and connecting end can realize the indicator to fall off when the clamp is pressed to the position, has the eye -catching indication function.

Description

Technical Field

[0001] This utility model relates to the field of pipe fittings technology, and more specifically, to pipe connection fittings and pipe systems. Background Technology

[0002] Commonly used pipe fittings in the piping industry include crimp-type, quick-connect, flared-end sliding-tight, and compression fittings. However, most common pipe fittings on the market have limited functionality and present some drawbacks and safety hazards. For example, traditional crimp-type fittings lack leak-proof crimping indication, making troubleshooting difficult, time-consuming, and labor-intensive. With externally sealed quick-connect fittings, the insertion depth is not readily visible during installation; it requires pre-measuring the insertion depth and marking the insertion end on the pipe, resulting in low installation efficiency. Flared-end sliding-tight fittings require two steps—flaring and tightening—requiring two sets of installation tools, making installation cumbersome. Compression fittings require tightening nuts during installation, which is extremely inconvenient in areas with limited space, and the nuts tend to loosen after a period of use, posing a risk of leakage.

[0003] Pipe clamps are also used on the market to connect pipes, but they also have some drawbacks. For example, clamps are usually directly fitted onto the pipe and pressed together. The clamps cannot be positioned axially or circumferentially, especially when installing on risers, where they are prone to slipping off. During pressing, they can easily deviate from the core sealing area, posing a risk of leakage. In addition, commercially available clamps have limited functionality and lack anti-leakage pressing features. The appearance before and after installation is similar, making it easy to miss the pressing point and cause pipe leaks. Furthermore, since there are no visual indicators during the pressing process, it is difficult to determine when the pressing is complete.

[0004] In view of this, this utility model is proposed. Utility Model Content

[0005] The purpose of this utility model is to provide pipe connection fittings and pipe systems, aiming to improve at least one of the problems mentioned in the background art.

[0006] This utility model is implemented as follows: In a first aspect, this utility model provides a pipe connection fitting, including a core, a connecting sleeve, a tightening sleeve, a clamp, and an indicator; The tightening sleeve includes a positioning end, a force-bearing part and a connecting end arranged sequentially along the axial direction. The outer wall of the core is provided with an annular groove. The tightening sleeve is sleeved outside the core, and the positioning end is locked in the annular groove. The direction from the connecting end to the positioning end is the installation direction. Multiple radial through-slots are opened on the tightening sleeve along the installation direction. Each slot extends to the end face that penetrates the connecting end. The connecting sleeve is fitted on the outside of the core and snaps into the connecting end. The inner wall of the tightening sleeve and the outer wall of the core form a pipe installation cavity. The clamp includes an interconnected arc-shaped clamp body and a clamping part. The clamp body is fitted over the force-bearing part, and the clamp body can be tightened by using a tool to engage the clamping part. The outer wall of the connecting end is provided with two mounting short tubes in the same circumferential direction. The connecting sleeve has two through holes in the same circumferential direction. The indicator is arc-shaped. Two sets of symmetrical locking protrusions are provided on the indicator near its opposite ends. The two mounting short tubes pass through the two through holes one by one. The two sets of locking protrusions can be locked in the two mounting short tubes one by one, so that the indicator is fastened to the surface of the connecting sleeve.

[0007] In an optional embodiment, the force-bearing part is provided with a radially penetrating transverse groove near the positioning end, corresponding to the number of long grooves, and each transverse groove is connected to a long groove.

[0008] In an optional embodiment, an observation hole is provided at the positioning end to observe whether the pipe is installed in place during pipe installation.

[0009] In an optional embodiment, the clamping part includes a clamping ear and two force-bearing parts connected to opposite sides of the clamping ear. The two force-bearing parts are connected to opposite ends of the hoop. The distance from the clamping ear to the center of the hoop is greater than the radius of the hoop. The angle between each force-bearing part and the clamping ear is an acute angle or a right angle.

[0010] In an optional embodiment, the outer diameter of the tightening sleeve at the positioning end is larger than the outer diameter at the force-bearing part, so that a stepped surface is formed at the junction of the positioning end and the force-bearing part, and the clamp is located between the stepped surface and the connecting sleeve.

[0011] In an optional embodiment, the indicator further includes a tension part, which has a mounting opening on the indicator. The tension part is disposed in the mounting opening, and one end of the tension part is connected to the edge of the indicator corresponding to the mounting opening. The other end of the tension part is provided with a protrusion that protrudes into the inner side of the arc of the indicator. The indicator has two states: free state and installed state. In the free state, the opening size of the indicator is smaller than the outer wall size of the hoop, and the protrusion protrudes from the inner wall of the indicator. In the installed state, the indicator is fastened to the surface of the connecting sleeve, the protrusion abuts against the outer wall of the connecting sleeve, the tension part undergoes elastic deformation, and when the tightening sleeve undergoes deformation with a smaller diameter, the indicator falls off the connecting sleeve under the action of the rebound force provided by the tension part.

[0012] In an optional embodiment, there are two mounting ports and two tensioning parts, with the two tensioning parts respectively disposed in the two mounting ports and symmetrically arranged about the center plane of the indicator.

[0013] In an optional embodiment, the clamping lug is provided with at least one reinforcing groove that is recessed inward.

[0014] In an optional embodiment, the inner wall of the indicator is provided with two mounting grooves, each set of protrusions is provided in the mounting groove, each set of protrusions includes two oppositely arranged protrusions, and there is a gap between the two oppositely arranged protrusions to provide deformation space. One end of each protrusion is connected to the mounting groove, and the other end is provided with an arc-shaped protrusion. The protrusion direction of the arc-shaped protrusion is away from the other protrusion opposite it. The maximum distance between the two opposing arc-shaped protrusions is c, and the gap distance is e. A limiting arc-shaped ring is provided on the inner wall of the mounting short pipe near its opening. The inner diameter of the limiting arc-shaped ring is d, and the inner diameter of the mounting short pipe at the non-limiting arc-shaped ring is f. When the protrusion is not inserted into the mounting short pipe, c > d, f > ce.

[0015] In an optional embodiment, the connecting end is provided with multiple connecting grooves penetrating its end face, and the inner wall of the connecting sleeve is provided with inner protruding ribs that match the number of connecting grooves and extend along the axial direction of the connecting sleeve. The connection between the tightening sleeve and the connecting sleeve is achieved by having multiple connecting grooves be engaged one-to-one with the multiple inner protruding ribs.

[0016] In an optional embodiment, the inner wall of the connecting sleeve is provided with a stepped portion, and each inner protruding rib is connected to the stepped portion, or each inner protruding rib is located near the stepped portion; after the multiple connecting grooves are correspondingly engaged with the multiple inner protruding ribs, the end of the tightening sleeve abuts against the stepped portion.

[0017] In an optional embodiment, the end of the inner rib near the tightening sleeve is the first end, and the other end is the last end. The width of the inner rib gradually increases from the first end to the middle, and slots are opened on opposite sides of the area from the middle to the last end. The opening of the connecting groove is provided with a hook to make the opening smaller. When multiple connecting grooves are locked onto the outside of multiple inner convex ribs, the middle part of the inner convex rib is locked into the connecting groove, and the hook is locked into the groove.

[0018] In an optional embodiment, an inner convex ring is provided on the inner wall of the end of the positioning end, and the inner diameter of the positioning end at the inner convex ring gradually increases along the installation direction. The core has a protrusion with an outer diameter larger than other parts. The protrusion is provided with a ring-shaped abutment and a ring-shaped convex ring, and a ring groove is formed between the abutment and the convex ring. The inner convex ring has a conical surface, and the outer diameter of the core at the conical surface gradually increases in the installation direction; the inner diameter of the positioning end corresponding to the smallest inner diameter of the inner convex ring is a, and the outer diameter of the core corresponding to the largest outer diameter of the conical surface is b, where a is greater than b.

[0019] In an optional embodiment, the outer wall of the tightening sleeve is provided with a positioning protrusion, and the clamp is provided with a positioning hole. When the clamp is fitted outside the tightening sleeve, the positioning protrusion is embedded in the positioning hole.

[0020] In an optional embodiment, the core includes an inlet section, a sealing mounting section, and a protrusion arranged sequentially. The outer wall of the sealing installation section is provided with multiple ring teeth, each ring tooth being used to engage with the inner wall of the pipe after the pipe is installed into the pipe installation cavity and tightened. Each ring tooth has opposing inclined surfaces and a check surface, and at least one of the ring teeth has an inclined surface facing the inlet section. The sealing installation section is provided with at least one sealing groove, and each sealing groove is provided with a sealing ring. A ring of teeth is provided on each of the opposite sides of the sealing groove, and the check surfaces of the ring teeth on the opposite sides of the sealing groove are arranged opposite to each other. The wire diameter of the sealing ring is 0.05~0.2mm smaller than the depth of the sealing groove.

[0021] Secondly, this utility model provides a pipeline system, including the pipeline connection fittings provided in this utility model embodiment.

[0022] This utility model has the following beneficial effects: The pipe connection fitting provided by this utility model is used by inserting the pipe into the pipe installation cavity until it is fully inserted. The clamping part is clamped by a tool, which reduces the diameter of the clamp and tightens the tightening part. During the tightening process, the diameter of the tightening part decreases, and the installation short pipe will move towards the axis. When the tightening sleeve has completely and stably installed the pipe, the locking protrusion will disengage from the installation short pipe. The disengagement of the locking protrusion causes the indicator to fall off the connecting sleeve, which reminds the installer that the installation is complete.

[0023] Therefore, the pipe connection fittings provided by this utility model have a simple structure, are easy to install and use, and the matching arrangement of the indicator, connecting sleeve and tightening sleeve can intuitively indicate that the clamping is complete and make it easy to identify that the clamping is in place. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A schematic diagram of the pipe connection fitting provided in an embodiment of this utility model from a first-view perspective; Figure 2 A schematic diagram of the pipe connection fitting provided in an embodiment of this utility model from a second perspective; Figure 3 for Figure 1 Sectional view at point AA; Figure 4 A schematic diagram of the pipe connection fitting provided in an embodiment of this utility model from a second perspective; Figure 5 for Figure 3 Sectional view at point BB; Figure 6 This is a schematic diagram of the clamp structure; Figure 7 This is a schematic diagram of the indicator's structure; Figure 8 This is a schematic diagram of the core structure; Figure 9 This is a schematic diagram of the tightening sleeve structure; Figure 10 A cross-sectional view of the tightening sleeve; Figure 11 This is a schematic diagram of the connecting sleeve. Figure 12 This is a sectional view of the connecting sleeve.

[0026] Icons: 100 - Pipe connection fittings; 101 - Pipe installation cavity; 110-Clamp; 111-Clamping part; 111a-Clamping lug; 111b-Force-applying part; 111c-Reinforcing groove; 115-Clamp body; 116-Positioning hole; 120 - Indicator; 121 - Tension section; 122 - Mounting port; 123 - Protrusion; 124 - Mounting groove; 125 - Snap protrusion; 126 - Snap protrusion; 126a - Arc-shaped protrusion; 127 - Gap; 130 - Tightening sleeve; 132 - Connecting end; 132a - Mounting short pipe; 132b - Hook; 133 - Positioning end; 133a - Observation hole; 133b - Inner convex ring; 133c - Axial groove; 134 - Long groove; 135 - Horizontal groove; 136 - Stepped surface; 137 - Connecting groove; 138 - Positioning protrusion; 139 - Force-bearing part; 140 - Connecting sleeve; 141 - Inner rib; 141a - First end; 141b - Tail end; 143 - Stepped part; 144 - Slot; 145 - Through hole; 150 - Core; 151 - Protrusion; 151a - Blocking part; 151b - Convex ring; 151c - Annular groove; 151d - Conical surface; 152 - Inlet section; 153 - Sealing installation section; 154 - Ring tooth; 154a - Inclined surface; 154b - Check valve surface; 155 - Sealing groove; 156 - Sealing ring; 200 - Pipe material. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0029] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0030] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0031] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0032] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0033] like Figures 1 to 5 As shown, this utility model embodiment provides a pipe connection fitting 100, including a core 150, a connecting sleeve 140, a tightening sleeve 130, a clamp 110, and an indicator 120; The tightening sleeve 130 includes a positioning end 133, a force-bearing part 139 and a connecting end 132 arranged sequentially along the axial direction. The outer wall of the core 150 is provided with an annular groove 151c. The tightening sleeve 130 is sleeved outside the core 150, and the positioning end 133 is engaged in the annular groove 151c. like Figure 9 and Figure 10As shown, the direction from the connecting end 132 to the positioning end 133 is the installation direction. Multiple radially penetrating long grooves 134 are opened on the tightening sleeve 130 along the installation direction. Each long groove 134 extends to the end face that penetrates the connecting end 132. The connecting sleeve 140 is fitted on the outside of the core 150 and snapped into the connecting end 132. The inner wall of the tightening sleeve 130 and the outer wall of the core 150 form a pipe installation cavity 101. like Figure 5 , Figure 6 and Figure 7 As shown, the clamp 110 includes an arc-shaped clamp body 115 and a clamping part 111 connected to each other. The clamp body 115 is sleeved outside the force-bearing part 139. The clamp body 115 can be tightened by using a tool to bite the clamping part 111. The outer wall of the connecting end 132 is provided with two mounting short tubes 132a in the same circumferential direction. The connecting sleeve 140 has two through holes 145 in the same circumferential direction. The indicator 120 is an arc plate shape. Two sets of symmetrical locking protrusions 125 are provided on the indicator 120 near its opposite ends. The two mounting short tubes 132a pass through the two through holes 145 one by one. The two sets of locking protrusions 125 can be locked in the two mounting short tubes 132a one by one, so that the indicator 120 is fastened to the surface of the connecting sleeve 140.

[0034] The pipe connection fitting 100 provided by this utility model is used by inserting the pipe 200 into the pipe installation cavity 101 until it is fully inserted. The clamping part 111 is clamped with a tool to reduce the diameter of the clamp 115, thereby tightening the tightening part. During the tightening process, the diameter of the tightening part decreases, and the installation short pipe 132a will move towards the axis. When the tightening sleeve 130 completely and stably installs the pipe 200, the locking protrusion 125 will disengage from the installation short pipe 132a. The disengagement of the locking protrusion 125 causes the indicator 120 to fall off the connecting sleeve 140. The falling of the indicator 120 reminds the installer that the installation is complete.

[0035] Therefore, the pipe connection fitting 100 provided by this utility model has a simple structure, is easy to install and use, and the coordinated arrangement of the indicator 120, the connecting sleeve 140 and the tightening sleeve 130 can intuitively indicate that the clamping is complete and make it easy to identify that the clamping is in place.

[0036] Alternatively, the indicator 120 may be made of an engineering injection molded material with a low coefficient of friction, high elasticity, and bright colors, such as POM.

[0037] Optionally, the clamping part 111 includes a clamping ear 111a and two force-applying parts 111b respectively connected to opposite sides of the clamping ear 111a. The two force-applying parts 111b are respectively connected to opposite ends of the hoop 115. The distance from the clamping ear 111a to the center of the hoop 115 is greater than the radius of the hoop 115. The angle between each force-applying part 111b and the clamping ear 111a is an acute angle or a right angle. This type of clamping part 111 facilitates tool clamping and tightening.

[0038] Optionally, such as Figure 5 , Figure 6 and Figure 7 As shown, the indicator 120 includes a tension part 121, and the indicator 120 has a mounting port 122. The tension part 121 is disposed in the mounting port 122, and one end of it is connected to the edge of the indicator 120 corresponding to the mounting port 122. The other end of the tension part 121 is provided with a protrusion 123 protruding towards the inner side of the arc of the indicator 120. The indicator 120 has two states: a free state and an installed state. In the free state, the opening of the indicator 120 is smaller than the outer wall of the clamp 115, and the protrusion 123 protrudes from the inner wall of the indicator 120. In the installed state, the indicator 120 is fastened to the surface of the connecting sleeve 140, the protrusion 123 abuts against the outer wall of the connecting sleeve 140, and the tension part 121 undergoes elastic deformation. When the tightening sleeve 130 undergoes deformation with a smaller diameter, the indicator 120 falls off the connecting sleeve 140 under the rebound force provided by the tension part 121. The tension part 121 and the protrusion 123 prevent the indicator 120 from falling off even when it is already pressed into place.

[0039] Furthermore, there are two mounting ports 122 and two tensioning parts 121. The two tensioning parts 121 are respectively disposed in the two mounting ports 122, and the two tensioning parts 121 are symmetrically arranged about the center face of the indicator 120.

[0040] The symmetrical arrangement of the two sets of tension sections 121 can make the abutment force received by the clamp 110 more balanced, thereby making the timing of the indicator 120 falling off more accurate.

[0041] Optionally, such as Figure 3 and Figure 7As shown, the inner wall of the indicator 120 is provided with two mounting grooves 124. Each set of latching protrusions 125 is disposed in the mounting groove 124. Each set of latching protrusions 125 includes two opposing latching protrusions 126. There is a gap 127 between the two opposing latching protrusions 126 to provide deformation space. One end of each latching protrusion 126 is connected to the mounting groove 124, and the other end is provided with an arc-shaped protrusion 126a. The protrusion direction of the arc-shaped protrusion 126a is away from the direction of the other latching protrusion 126 opposite to it. The maximum distance between the arc-shaped protrusions 126a of the two opposing latching protrusions 126 is c, and the distance of the gap 127 is e. A limiting arc-shaped ring is provided on the inner wall of the mounting short tube 132a near its opening. The inner diameter of the limiting arc-shaped ring is d. When the latching protrusion 125 is not engaged in the mounting short tube 132a, c > d, f > ce.

[0042] When the indicator 120 needs to be fastened to the outside of the mounting sleeve, the two opposing protrusions 126 are pressed into the mounting short tube 132a. Due to the setting of the arc-shaped protrusions 126a and the limiting arc-shaped ring, the protrusions 125 can easily slide into the mounting short tube 132a. Furthermore, due to the setting of the distance between the two arc-shaped protrusions 126a, the distance of the gap 127, and the size of the inner diameter of the limiting arc-shaped ring, the indicator 120 can be assembled with good stability and is not easy to fall off during transportation and use.

[0043] Furthermore, such as Figure 6 As shown, the clamp ear 111a is provided with at least one reinforcing groove 111c that is recessed inward.

[0044] The reinforcement rib 111c can increase the strength of the top of the clamp 111a and prevent the top of the clamp 111a from being bent or deformed.

[0045] Optionally, such as Figure 5 and Figure 8 As shown, the core 150 of the connecting pipe fitting of this utility model can be a plug, a threaded fitting, or a fitting with two or more ends. With the structure shown in the attached drawings of this utility model, if the core 150 has two ends, then the number of sets of the connecting sleeve 140, tightening sleeve 130, and clamp 110 assembly is two. Similarly, if the core 150 has three ends, then the number of sets is three.

[0046] Optionally, the core 150 includes an inlet section 152, a sealing installation section 153, and a protrusion 151 arranged sequentially. The outer wall of the sealing installation section 153 is provided with multiple ring teeth 154. Each ring tooth 154 is used to fit into the inner wall of the pipe 200 after the pipe 200 is installed into the pipe installation cavity 101 and is tightened, thereby achieving a seal for the installation of the pipe 200.

[0047] Optionally, each ring tooth 154 has opposing inclined surfaces 154a and check surfaces 154b, with at least one of the ring teeth 154 having its inclined surface 154a facing the inlet section 152. The arrangement of the ring teeth 154 effectively prevents the pipe 200 from coming out of the core 150.

[0048] Optionally, the sealing installation section 153 is provided with at least one sealing groove 155, and a sealing ring 156 is provided in each sealing groove 155. A ring of teeth 154 is provided on each opposite side of the sealing groove 155, and the check surfaces 154b of the ring teeth 154 on opposite sides of the sealing groove 155 are arranged opposite each other. After the pipe 200 is compressed, the inner wall of the pipe 200 abuts against the outer wall of the sealing ring 156. The sealing ring 156 further improves the sealing performance of the pipe 200 connection.

[0049] Therefore, the combination of ring teeth 154 and sealing ring 156 enables double sealing during pipe installation 200.

[0050] It should be noted that the inner diameter of the pipe 200 should be greater than the inlet section 152 of the core 150 and slightly greater than or equal to the sealing installation section 153. The outer diameter of the pipe 200 should be less than the inner diameter of the tightening sleeve 130 to ensure that the pipe 200 can be smoothly inserted into the pipe installation cavity 101.

[0051] Optionally, the wire diameter of the sealing ring 156 is slightly smaller than the groove depth of the sealing ring 156 (0.05~0.2mm smaller). Without proper clamping, a seal cannot be achieved. If the clamping is not performed properly during installation, water will leak out through the gap of the O-ring and then from the 200 port of the pipe during the water test. This can indicate to the installer that the clamping has not been performed or that the clamping is not in place.

[0052] Optionally, such as Figure 2 As shown, the outer diameter of the tightening sleeve 130 at the positioning end 133 is greater than the outer diameter at the force-bearing part 139, so that a stepped surface 136 is formed at the junction of the positioning end 133 and the force-bearing part 139, and the clamp 110 is located between the stepped surface 136 and the connecting sleeve 140.

[0053] The clamp 115 is fitted onto the force-bearing part 139. Its position between the step surface 136 and the connecting sleeve 140 enables the axial positioning of the clamp 110. This effectively prevents water leakage caused by the clamp 110 shifting off the sealing area due to operational errors when tightening the clamp 110 with tools.

[0054] Optionally, such as Figure 3 , Figure 5 Figure 9 and Figure 10 As shown, an inner convex ring 133b is provided on the inner wall of the end of the positioning end 133. Along the installation direction, the inner diameter of the positioning end 133 at the inner convex ring 133b gradually increases. The core 150 has a protrusion 151 with an outer diameter larger than other parts. The protrusion 151 is provided with an annular abutment 151a and a convex ring 151b. An annular groove 151c is formed between the abutment 151a and the convex ring 151b. The convex ring 151b has a conical surface 151d. In the installation direction, the outer diameter of the core 150 at the conical surface 151d gradually increases. The inner diameter of the positioning end 133 at the position with the smallest inner diameter corresponding to the inner convex ring 133b is a, and the outer diameter of the core 150 at the position with the largest outer diameter corresponding to the conical surface 151d is b. a is greater than b.

[0055] The inner diameter of the inner convex ring 133b gradually increases, meaning that the inner wall of the inner convex ring 133b is an annular inclined surface. The conical surface 151d of the convex ring 151b is also an annular inclined surface, which facilitates the smooth sliding of the connecting sleeve 140 into the annular groove 151c under the action of the two annular inclined surfaces during assembly.

[0056] Optionally, the inner convex ring 133b is provided with a plurality of evenly distributed axial grooves 133c. The axial grooves 133c increase the deformation space of the inner convex ring 133b, making it easier for it to be inserted into the annular groove 151c.

[0057] Optionally, an observation hole 133a is provided at the positioning end 133 near the inner convex ring 133b, which is used to observe whether the pipe 200 is installed in place when the pipe 200 is installed.

[0058] Optionally, the width of each long groove 134 gradually increases in the opposite direction to the installation direction. This design of the long groove 134 makes it easier to demold the tightening sleeve 130 during the manufacturing process.

[0059] Optionally, a radially penetrating transverse groove 135 corresponding to the number of long grooves 134 is provided near the positioning end 133, and each transverse groove 135 is connected to a long groove 134 to form a T-shaped groove.

[0060] The horizontal groove 135 increases the deformation space and also reduces the width between the two long grooves 134, making it easier for the tightening sleeve 130 to deform and reduce the diameter of the clamping pipe 200, thereby increasing the sealing reliability.

[0061] Optionally, such as Figure 5 , Figure 9 and Figure 10 As shown, the connecting end 132 is provided with a plurality of connecting grooves 137 penetrating its end face, and the inner wall of the connecting sleeve 140 is provided with inner protruding ribs 141 extending along the axial direction of the connecting sleeve 140 in a number matching the number of connecting grooves 137. The connection between the tightening sleeve 130 and the connecting sleeve 140 is achieved by having the plurality of connecting grooves 137 correspondingly engaged with the plurality of inner protruding ribs 141.

[0062] Specifically, as shown in the figure, four long slots 134 are provided, which divide the tightening sleeve 130 into four equal areas. The mounting short pipe 132a is provided on the outer wall of two adjacent areas, and the connecting slot 137 is provided on the outer wall of the other two adjacent areas. It should be noted that the number and position of the long slots 134 can be set according to actual needs and are not limited to the arrangement shown in the figure of this embodiment.

[0063] Optionally, such as Figure 5 , Figure 11 and Figure 12 As shown, the inner wall of the connecting sleeve 140 is provided with a stepped portion 143, and each inner protruding rib 141 is connected to the stepped portion 143, or each inner protruding rib 141 is provided at a position close to the stepped portion 143; after the multiple connecting grooves 137 are correspondingly engaged with the multiple inner protruding ribs 141, the end of the tightening sleeve 130 abuts against the stepped portion 143.

[0064] Optionally, the end of the inner rib 141 near the tightening sleeve 130 is the first end 141a, and the other end is the tail end 141b. The width of the inner rib 141 gradually increases from the first end 141a to the middle. Slots 144 are opened on opposite sides of the area from the middle to the tail end 141b. The opening of the connecting groove 137 is provided with a hook 132b to make the opening smaller. When multiple connecting grooves 137 are locked onto the outside of multiple inner ribs 141, the middle part of the inner rib 141 is locked into the connecting groove 137, and the hook 132b is locked into the slot 144.

[0065] The process of connecting the connecting sleeve 140 to the connecting end 132 is as follows: the inner protruding rib 141 aligns with the connecting groove 137, and its first end 141a first enters the long groove 134. As the inner protruding rib 141 slides into the long groove 134, it is gradually expanded. When the middle part of the inner protruding rib 141 just enters the long groove 134, the long groove 134 is expanded to its maximum. Then it moves, and the inner protruding rib 141 is locked into the connecting groove 137. At this time, the hook 132b of the connecting end 132 falls into the slot 144, and the long groove 134 returns to its original size, completing the installation. The specific structural design of the section from the first end 141a to the middle of the inner protruding rib 141 can play an assembly guiding role, making the assembly of the connecting sleeve 140 more convenient.

[0066] Optionally, the outer wall of the tightening sleeve 130 is provided with a positioning protrusion 138, and the clamp 110 is provided with a positioning hole 116. When the clamp 110 is fitted outside the tightening sleeve 130, the positioning protrusion 138 is embedded in the positioning hole 116.

[0067] The positioning protrusion 138 and positioning hole 116 enable the axial and circumferential positioning of the clamp 110, further improving the crimping accuracy of the clamp 110.

[0068] The assembly process of the pipe connection fitting 100 provided in this embodiment of the utility model is as follows: (1) Fit the sealing ring 156 into the sealing groove 155 of the core 150; (2) Place the clamp 110 axially onto the tightening sleeve 130, press the outer diameter of the tightening sleeve 130 lightly to make it radially shrink, and at the same time adjust the position and angle of the clamp 110 so that the protrusion 123 on the tightening sleeve 130 is inserted into the positioning hole 116 of the clamp 110. (3) During assembly, first press the tightening sleeve 130 lightly to make it shrink radially, and at the same time insert the connecting sleeve 140 axially. The end face of the tightening sleeve 130 abuts against the step portion 143 of the connecting sleeve 140. The inner protruding rib 141 of the connecting sleeve 140 is inserted into the connecting groove 137 of the tightening sleeve 130, and the connecting short tube of the tightening sleeve 130 is inserted into the through hole 145 of the connecting sleeve 140.

[0069] (4) Align the connecting short tube on the indicator 120 with the corresponding through hole 145, press the indicator 120, and its locking protrusion 125 will be locked into the connecting short tube to prevent the indicator 120 from falling off.

[0070] (5) Press the assembled component positioning end 133 into the core 150 so that the inner convex ring 133b is inserted into the annular groove 151c of the core 150 to prevent it from coming off.

[0071] Installation and usage process: (1) After cutting the pipe 200, chamfer and round the end of the pipe 200; (2) After the chamfering is completed, the end of the pipe 200 is put into the core 150 through the pipe installation cavity 101 of the pipe connection fitting 100 and inserted to the bottom of the positioning end 133. The end of the pipe 200 can be observed through the observation hole 133a of the positioning end 133 to determine whether the pipe is inserted to the bottom.

[0072] (3) Use a clamping tool to clamp the clamping part 111 of the clamp 110 to deform and shrink it. At this time, the inner diameter of the clamp 110 shrinks and squeezes the tightening sleeve 130 to shrink it radially. The inner circle of the tightening sleeve 130 squeezes the outer circle of the pipe 200 to shrink the diameter of the pipe 200, so that the inner wall of the pipe 200 is pressed against the sealing ring 156 of the core 150 to form a seal. At the same time, the multiple ring teeth 154 of the core 150 will be embedded in the inner wall of the pipe 200 to prevent the pipe fitting from separating from the pipe 200, and also play a certain sealing role.

[0073] During the clamping process, the clamp 110 causes the tightening sleeve 130 to radially contract and deform, causing the locking protrusion 125 to disengage from the connecting short pipe. Simultaneously, under the rebound force of the tension section 121, when the clamp 110 is tightened to a certain extent, the indicator 120 detaches from the connecting sleeve 140. This facilitates the installer's identification of whether the pipe fitting has been properly clamped, preventing missed clamping and thus achieving the product's anti-leakage crimping function.

[0074] (4) After all pipe fittings and joints are installed and crimped, it is necessary to observe whether each connection point has been crimped properly and to conduct a water test to check the pipeline system. If the above steps are not crimped properly or not crimped in place, water will flow out through the gap of the O-ring and then leak from the 200 port of the pipe during the water test. This can prompt the installer to complete the crimping and achieve a double anti-leakage crimping prompt function.

[0075] In summary, the pipe fitting 100 provided by this utility model can be used for connection and maintenance in water supply, drainage, heating, and other piping systems. The coordinated arrangement of the indicator 120, connecting sleeve 140, and tightening sleeve 130 provides a clear indication of successful clamping, making it easy to identify when the clamping is in place. In the preferred embodiment, the brightly colored indicator 120 automatically pops out and detaches during installation and clamping, resulting in a significant change in appearance before and after installation and making the indication highly visible. In the preferred embodiment, the leak-proof clamping indication is clear, and the dual leak-proof clamping function with leakage indication facilitates inspection by installers, eliminates safety hazards, greatly improves the inspection efficiency of plumbers, saves installation time, and reduces installation costs.

[0076] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A pipe connection fitting, characterized in that, Includes core, connecting sleeve, tightening sleeve, clamp, and indicator; The tightening sleeve includes a positioning end, a force-bearing part and a connecting end arranged sequentially along the axial direction. The outer wall of the core is provided with an annular groove. The tightening sleeve is sleeved outside the core, and the positioning end is engaged in the annular groove. The direction from the connecting end to the positioning end is the installation direction. Multiple radially penetrating long grooves are opened on the tightening sleeve along the installation direction. Each long groove extends to the end face that penetrates the connecting end. The connecting sleeve is sleeved on the core body and snaps into the connecting end. The inner wall of the tightening sleeve and the outer wall of the core body form a tube installation cavity. The clamp includes an arc-shaped clamp body and a clamping part that are connected to each other. The clamp body is sleeved outside the force-bearing part, and the clamp body can be tightened by using a tool to bite the clamping part. The outer wall of the connecting end is provided with two mounting short tubes in the same circumferential direction. The connecting sleeve has two through holes in the same circumferential direction. The indicator is arc-shaped. Two sets of symmetrical locking protrusions are provided on the indicator near its opposite ends. The two mounting short tubes pass through the two through holes one by one. The two sets of locking protrusions can be locked in the two mounting short tubes one by one, so that the indicator is fastened to the surface of the connecting sleeve.

2. The pipe fitting according to claim 1, characterized in that, Includes at least one of the following features (1) to (4): (1) The force-bearing part is provided with a radially penetrating transverse groove near the positioning end, corresponding to the number of the long grooves, and each transverse groove is connected to one of the long grooves; (2) The positioning end is provided with an observation hole, which is used to observe whether the pipe is installed in place when the pipe is installed; (3) The clamping part includes a clamping ear and two force-bearing parts connected to the opposite sides of the clamping ear respectively. The two force-bearing parts are connected to the opposite ends of the hoop respectively. The distance from the clamping ear to the center of the hoop is greater than the radius of the hoop. The angle between each force-bearing part and the clamping ear is an acute angle or a right angle. (4) The outer diameter of the tightening sleeve at the positioning end is greater than the outer diameter at the force-bearing part, so that a step surface is formed at the junction of the positioning end and the force-bearing part, and the clamp is located between the step surface and the connecting sleeve.

3. The pipe fitting according to claim 1, characterized in that, The indicator also includes a tension part, and the indicator has an opening for mounting. The tension part is disposed in the opening for mounting, and one end of the tension part is connected to the edge of the indicator corresponding to the opening for mounting. The other end of the tension part has a protrusion that protrudes into the inner side of the arc of the indicator. The indicator has two states: a free state and an installed state. In the free state, the opening of the indicator is smaller than the outer wall of the hoop, and the protrusion protrudes from the inner wall of the indicator. In the installed state, the indicator is fastened to the surface of the connecting sleeve, the protrusion abuts against the outer wall of the connecting sleeve, the tension part undergoes elastic deformation, and when the tightening sleeve undergoes deformation with a smaller diameter, the indicator falls off the connecting sleeve under the action of the rebound force provided by the tension part.

4. The pipe connection fitting according to claim 3, characterized in that, The number of mounting ports is two, and the number of tensioning parts is two. The two tensioning parts are respectively disposed in the two mounting ports, and the two tensioning parts are symmetrically arranged about the center face of the indicator.

5. The pipe connection fitting according to claim 1, characterized in that, The inner wall of the indicator is provided with two mounting grooves. Each set of the latching protrusions is disposed in the mounting groove. Each set of the latching protrusions includes two oppositely arranged latching protrusions. There is a gap between the two oppositely arranged latching protrusions to provide deformation space. One end of each latching protrusion is connected to the mounting groove, and the other end is provided with an arc-shaped protrusion. The protrusion direction of the arc-shaped protrusion is away from the other latching protrusion opposite it. The maximum distance between the arc-shaped protrusions of the two oppositely arranged locking protrusions is c, the distance of the gap is e, a limiting arc-shaped ring is provided on the inner wall of the mounting short tube near its opening, the inner diameter of the limiting arc-shaped ring is d, the inner diameter of the mounting short tube outside the limiting arc-shaped ring is f, and when the locking protrusion is not locked into the mounting short tube, c > d, f > ce.

6. The pipe connection fitting according to claim 1, characterized in that, The connecting end is provided with multiple connecting grooves that penetrate its end face, and the inner wall of the connecting sleeve is provided with inner protruding ribs that match the number of connecting grooves and extend along the axial direction of the connecting sleeve. The connection between the tightening sleeve and the connecting sleeve is achieved by having the multiple connecting grooves be engaged one-to-one with the multiple inner protruding ribs.

7. The pipe fitting according to claim 6, characterized in that, Includes at least one of the following features (1) and (2): (1) The inner wall of the connecting sleeve is provided with a stepped portion, and each of the inner protruding ribs is connected to the stepped portion, or each of the inner protruding ribs is provided at a position close to the stepped portion; After the multiple connecting slots are fitted one-to-one with the multiple inner protruding ribs, the end of the tightening sleeve abuts against the step portion; (2) The inner rib is the first end near the tightening sleeve and the other end is the tail end. The width of the inner rib gradually increases from the first end to the middle. Slots are opened on both sides of the area from the middle to the tail end. The opening of the connecting groove is provided with a hook to make the opening smaller. When the multiple connecting grooves are locked onto the multiple inner ribs one by one, the middle part of the inner rib is locked into the connecting groove, and the hook is locked into the slot.

8. The pipe fitting according to claim 1, characterized in that, Includes at least one of the following features (1) and (2): (1) The inner wall of the end of the positioning end is provided with an inner convex ring, and the inner diameter of the positioning end at the inner convex ring gradually increases along the installation direction. The core has a protrusion with an outer diameter larger than other parts. The protrusion is provided with an annular abutment and a convex ring, and the annular groove is formed between the abutment and the convex ring. The inner convex ring has a conical surface, and the outer diameter of the core at the conical surface gradually increases in the installation direction; the inner diameter of the positioning end corresponding to the smallest inner diameter position of the inner convex ring is a, and the outer diameter of the core corresponding to the largest outer diameter position of the conical surface is b, where a is greater than b. (2) The outer wall of the tightening sleeve is provided with a positioning protrusion, and the clamp is provided with a positioning hole. When the clamp is fitted outside the tightening sleeve, the positioning protrusion is embedded in the positioning hole.

9. The pipe fitting according to claim 4, characterized in that, The core includes an inlet section, a sealing mounting section, and a protrusion arranged sequentially. The outer wall of the sealing installation section is provided with multiple ring teeth, each of which is used to engage with the inner wall of the pipe after the pipe is installed into the pipe installation cavity and fastened. Each of the ring teeth has opposite inclined surfaces and a check surface, and at least one of the ring teeth has an inclined surface facing the inlet section; The sealing installation section is provided with at least one sealing groove, and a sealing ring is provided in each sealing groove. A ring of teeth is provided on each of the opposite sides of the sealing groove, and the check surfaces of the ring teeth on the opposite sides of the sealing groove are arranged opposite to each other. The diameter of the sealing ring is 0.05~0.2mm smaller than the depth of the sealing groove.

10. A piping system, characterized in that, Includes the pipe connection fittings as described in any one of claims 1 to 9.

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