Pipe joint structure

Abstract

This invention relates to the field of pipe connection technology and discloses a pipe joint structure, including a fixed pipe and a clamping pipe assembly. The fixed pipe is hinged to a connecting rod assembly, which is connected to a clamping block. One end of the clamping pipe assembly is inserted into the fixed pipe, and the outer circumferential surface of the clamping pipe assembly has a clamping groove spaced apart from the fixed pipe. At least part of the connecting rod assembly is spaced apart from the clamping groove along the diameter direction of the clamping pipe assembly on the outside of the clamping pipe assembly. The clamping block is located at a corresponding position on the side of the connecting rod assembly facing the clamping groove. The connecting rod assembly is configured to move closer to or further away from the clamping groove. The clamping pipe assembly has a limiting structure. When the connecting rod assembly moves to the point where the clamping block engages with the clamping groove, the limiting structure abuts against the side of the connecting rod assembly away from the fixed pipe, restricting the connecting rod assembly from moving in the direction away from the clamping groove. This application, through the above-described pipe joint structure, enables rapid installation and reliable connection between two pipes.

Description

Technical Field

[0001] This invention relates to the field of pipe connection technology, and more specifically to a pipe joint structure. Background Technology

[0002] During the construction and maintenance of heating pipelines, different sections of pipeline need to be reliably connected through joint structures to ensure the safe operation of the heating system. Existing pipe joints generally use flange bolt connections or welding fixation. Flange connections require the use of a wrench to tighten multiple bolts one by one, which is cumbersome and time-consuming. The limited construction space in narrow pipe trenches makes tool operation extremely inconvenient. Although welded connections have high strength, they cannot be disassembled for maintenance. The clamping force of traditional snap-fit ​​joints depends on the operator's manual control. Insufficient clamping force leads to an unstable connection that is prone to falling off under water pressure, while excessive clamping force may damage the clamping components or pipe interfaces. Summary of the Invention

[0003] This invention provides a pipe joint structure to solve the above-mentioned technical problems.

[0004] This invention provides a pipe joint structure, including a fixed pipe and a clamping pipe assembly. The fixed pipe is hinged to a connecting rod assembly, and the connecting rod assembly is connected to a clamping block. One end of the clamping pipe assembly is inserted into the fixed pipe, and the outer circumferential surface of the clamping pipe assembly forms a clamping groove spaced apart from the fixed pipe. At least part of the connecting rod assembly is spaced apart from the clamping groove along the diameter direction of the clamping pipe assembly on the outside of the clamping pipe assembly. The clamping block is located at a corresponding position on the side of the connecting rod assembly facing the clamping groove. The connecting rod assembly is configured to be able to approach or move away from the clamping groove. The clamping pipe assembly is provided with a limiting structure. When the connecting rod assembly moves to the point where the clamping block engages with the clamping groove, the limiting structure abuts against the side of the connecting rod assembly away from the fixed pipe and restricts the connecting rod assembly from moving in the direction away from the clamping groove.

[0005] Beneficial effects:

[0006] This application enables rapid installation and reliable connection between two pipes through the aforementioned pipe joint structure. Compared to related technologies, this application, while ensuring ease of installation, effectively balances the clamping force by limiting the connecting rod assembly through a limiting structure. This prevents the pipe joint from detaching under water pressure due to insufficient clamping force, and also prevents damage to the clamping components or pipe interfaces due to excessive clamping force, thereby improving the applicability and service life of the pipe joint under complex working conditions.

[0007] Optionally, along the axial direction of the clamping pipe assembly, the limiting structure is slidably connected to the clamping pipe assembly. The pipe joint structure also includes a driving structure, which is movably connected to the clamping pipe assembly and located on the side of the limiting structure away from the fixed pipe. The driving structure is connected to the limiting structure. When the clamping block engages with the clamping groove, the driving structure moves relative to the clamping pipe assembly, thereby driving the limiting structure to move to abut against the connecting rod assembly.

[0008] Beneficial effects: Therefore, this application can selectively achieve the limiting effect on the connecting rod assembly or release the limiting effect on the connecting rod assembly through the cooperation between the driving structure and the limiting structure.

[0009] Optionally, the locking tube assembly includes a locking tube and a control tube. One end of the locking tube is inserted into the fixed tube, and a locking groove is formed on the outer peripheral surface of the locking tube. The control tube is slidably sleeved on the other end of the locking tube along the axial direction of the locking tube. The limiting structure and the driving structure are both connected to the outer peripheral surface of the control tube. The connecting rod assembly includes a first connecting rod and a second connecting rod. The first connecting rod is hinged to the control tube, and the other end of the first connecting rod is hinged to the second connecting rod. The other end of the second connecting rod is hinged to the fixed tube. The locking block is located on the side of the second connecting rod facing the locking groove. When the control tube is manipulated to move away from the fixed tube, the first connecting rod and the second connecting rod move toward the locking tube.

[0010] Beneficial effects: Therefore, this application can control the engagement or disengagement state between the snap-fit ​​block and the snap-fit ​​groove by manipulating the control tube to move axially toward or away from the fixed tube, causing the first connecting rod and the second connecting rod to swing in conjunction with each other relative to the snap-fit ​​tube.

[0011] Optionally, the driving structure includes a rotating sleeve that is rotatably fitted onto the clamping tube assembly. An arc-shaped groove is formed on the side wall of the rotating sleeve. The arc-shaped groove extends obliquely along the circumference of the rotating sleeve and toward the limiting structure. The limiting structure includes a slider that is at least partially inserted into the arc-shaped groove and slides in cooperation with the arc-shaped groove. When the slider slides to the end of the arc-shaped groove near the limiting structure, the limiting structure abuts against the connecting rod assembly.

[0012] Beneficial effects: Therefore, through the above-mentioned arc groove and slider cooperation structure, the operator only needs to apply a rotation operation to the rotating sleeve to achieve precise control of the axial position of the limiting structure, thereby completing the establishment or release of the limiting state of the connecting rod group, effectively avoiding jamming or malfunction of the limiting structure during the adjustment process, and improving the reliability of the limiting control.

[0013] Optionally, the limiting structure includes a limiting sleeve, which covers the locking tube assembly and is at least partially located on the side of the rotating sleeve with the arcuate groove facing the locking tube assembly, and a slider is formed on the outer peripheral surface of this part; wherein, when the connecting rod assembly moves to the locking groove and engages with the locking block, the limiting sleeve can move to its inner wall surface to abut against the connecting rod assembly.

[0014] Beneficial effects: Therefore, this application applies a limiting effect to the connecting rod assembly by means of a limiting sleeve.

[0015] Optionally, the pipe joint structure also includes a locking structure, which is connected to one end of the rotating sleeve away from the limiting structure. A locking groove is formed on the outer circumferential surface of the clamping pipe assembly. The locking structure includes a locking block, which penetrates the limiting structure radially along the rotating sleeve and can approach or move away from the clamping pipe assembly. When the slider is located at the end of the arc groove facing the limiting structure, the locking block is driven to engage with the locking groove.

[0016] Beneficial effects: Therefore, the rotating sleeve is locked by directly inserting the locking block into the locking groove.

[0017] Optionally, the locking block is disposed at one end of the rotating sleeve away from the limiting structure. A first elastic element is disposed between the locking block and the limiting structure. The locking structure also includes a drive assembly. The drive assembly is partially threadedly sleeved onto the outer peripheral surface of the clamping tube assembly. Along the radial direction of the clamping tube assembly, the drive assembly is partially spaced from the outer peripheral surface of the clamping tube assembly. When the slider is located at the end of the arc groove facing closer to the limiting structure, the drive assembly moves to contact the end of the locking block away from the clamping tube assembly and can drive the locking block to compress the first elastic element and engage with the locking groove.

[0018] Beneficial effects: Therefore, the locking block is driven to engage with the locking slot by the drive kit.

[0019] Optionally, the drive assembly includes a threaded sleeve and an abutment sleeve. The threaded sleeve is fitted onto the retaining tube assembly and is threadedly connected to the outer peripheral surface of the retaining tube assembly. The abutment sleeve is fitted onto the side of the threaded sleeve facing the limiting structure and is connected to the threaded sleeve. The abutment sleeve has a portion spaced apart from the outer peripheral surface of the retaining tube assembly. A sliding groove is formed on the inner surface of the abutment sleeve. The sliding groove can extend axially along the abutment sleeve and penetrates the end of the abutment sleeve facing the rotating sleeve. The end of the locking block away from the retaining tube assembly is slidably connected to the sliding groove. The bottom surface of the sliding groove is arc-shaped and extends obliquely in the direction close to the retaining tube assembly.

[0020] Beneficial effects: Therefore, the locking block is driven to press down on the first elastic element by sliding groove.

[0021] Optionally, a seal is provided between the clamping tube assembly and the fixed tube, which can seal the gap between the clamping tube assembly and the fixed tube.

[0022] Beneficial effects: Therefore, it is necessary to improve the sealing performance between the clamping pipe assembly and the fixed pipe.

[0023] Optionally, the sealing element includes an expansion ring and a sealing ring. The expansion ring is disposed on the end face of the clamping tube assembly inserted into the fixing tube. The sealing ring is connected to the end face of the expansion ring facing away from the clamping tube. A sealing ring groove is formed at the end of the sealing ring facing away from the expansion ring. An annular protrusion is formed on the inner side of the fixing tube. The annular protrusion is inserted into the sealing ring groove for sealing. The expansion ring can expand when heated.

[0024] Beneficial effects: Therefore, this application can prevent leaks caused by loosening between the card connector and the fixed pipe due to thermal expansion and contraction. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a three-dimensional structural diagram of the pipe plug structure according to an embodiment of the present invention; Figure 2 This is a partial cross-sectional three-dimensional structural diagram of the pipe plug structure according to an embodiment of the present invention; Figure 3 This is a three-dimensional cross-sectional structural diagram of the control pipe of the pipe plug structure according to an embodiment of the present invention; Figure 4 This is a three-dimensional structural diagram of the back of the control tube of the pipe plug structure according to an embodiment of the present invention; Figure 5 This is a cross-sectional three-dimensional structural diagram of the insertion tube and fixing tube of the pipe plug structure according to an embodiment of the present invention.

[0027] Explanation of reference numerals in the attached figures: 100. Fixed tube; 110. Annular protrusion; 200. Connecting rod assembly; 210. First connecting rod; 220. Second connecting rod; 230. Snap-fit ​​block; 240. Second elastic element; 300, snap-fit ​​connector assembly; 310, snap-fit ​​groove; 320, snap-fit ​​connector; 321, strip-shaped guide groove; 330, control tube; 331, strip-shaped guide protrusion; 332, stepped annular groove; 333, locking groove; 400. Limiting structure; 410. Limiting sleeve; 420. Slider; 500. Drive structure; 510. Rotating sleeve; 511. Locking ring plate; 520. Arc groove; 600. Locking structure; 610. Locking block; 620. Drive assembly; 621. Threaded sleeve; 622. Abutment sleeve; 623. Thrust bearing; 630. First elastic element; 700, Seal; 710, Expansion ring; 720, Sealing ring; 721, Sealing ring groove. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] In response to the above technical problems, such as Figures 1 to 5 As shown, this embodiment provides a pipe joint structure, which mainly consists of a fixed pipe 100, a clamping pipe assembly 300, and a limiting structure 400. The fixed pipe 100 serves as a basic support component, and a connecting rod assembly 200 is hinged to it. The connecting rod assembly 200 is equipped with a clamping block 230 for locking. In the initial assembly state, one end of the clamping pipe assembly 300 can be inserted axially into the fixed pipe 100, thereby completing the initial positioning between the pipes.

[0030] The outer circumferential surface of the snap-fit ​​tube assembly 300 is provided with a snap-fit ​​groove 310. After the snap-fit ​​tube assembly 300 is inserted into the fixing tube 100, the snap-fit ​​groove 310 and the fixing tube 100 are spaced apart in the axial direction, such that the snap-fit ​​groove 310 is located outside the fixing tube 100. The connecting rod assembly 200 is at least partially arranged radially outside the snap-fit ​​tube assembly 300, and is arranged radially spaced relative to the snap-fit ​​groove 310 to provide a structural basis for subsequent snap-fit ​​actions.

[0031] Based on this, the snap-fit ​​block 230 is located at a corresponding position on the side of the connecting rod assembly 200 facing the snap-fit ​​groove 310, so that the snap-fit ​​block 230 can precisely correspond to the snap-fit ​​groove 310 in the radial direction. That is, the snap-fit ​​block 230 is located at the position where the connecting rod assembly 200 and the snap-fit ​​groove 310 are spaced apart. Therefore, when the snap-fit ​​block 230 is inserted into the snap-fit ​​groove 310, it can reliably limit the axial movement of the snap-fit ​​pipe assembly 300, thereby effectively resisting the axial separation force generated by water pressure fluctuations, fluid impacts, or thermal expansion and contraction during pipeline operation, and significantly improving the overall stress stability of the pipeline connection.

[0032] Furthermore, the connecting rod assembly 200 and the fixed tube 100 are connected by a hinge, allowing the snap-fit ​​block 230 a degree of freedom to reciprocate along the radial direction of the snap-fit ​​tube assembly 300. Specifically, the hinge axis between the connecting rod assembly 200 and the fixed tube 100 is perpendicular to the direction in which the snap-fit ​​block 230 moves toward the snap-fit ​​groove 310. Therefore, the operator only needs to apply an operating force to the connecting rod assembly 200 to drive the snap-fit ​​block 230 to stably insert into or disengage from the snap-fit ​​groove 310 in the radial direction, thereby achieving a detachable connection between the fixed tube 100 and the snap-fit ​​tube assembly 300, reducing the operational difficulty during installation and disassembly, and improving construction efficiency.

[0033] The pipe joint structure of this embodiment also includes a limiting structure 400, which is disposed on the clamping pipe assembly 300 and is used to limit the connecting rod assembly 200 under the clamping engagement of the clamping groove 310 and the clamping block 230, so as to constrain the reverse swing of the connecting rod assembly 200, thereby suppressing the clamping block 230 from swinging back under the action of external force, causing the clamping block 230 to detach from the clamping groove 310.

[0034] Specifically, when the connecting rod assembly 200 moves toward the locking groove 310 and the locking block 230 engages with the locking groove 310, the limiting structure 400 is manipulated to abut against the side of the connecting rod assembly 200 away from the fixed tube 100, and a constraint is applied to the connecting rod assembly 200 to restrict its movement away from the locking groove 310. This not only enhances the connection stability between the locking block 230 and the locking groove 310, but also effectively prevents loosening of the locking mechanism due to vibration, impact, or accidental human contact during long-term operation, further improving the overall connection reliability between the fixed tube 100 and the locking tube assembly 300.

[0035] Therefore, this embodiment enables rapid installation and reliable connection between two pipes through the aforementioned pipe joint structure. Compared to related technologies, this embodiment, while ensuring ease of installation, effectively balances the clamping force by limiting the connecting rod assembly 200 through the limiting structure 400. This prevents detachment under water pressure impact due to insufficient clamping force, and also prevents damage to the clamping components or pipe interfaces due to excessive clamping force, thereby improving the applicability and service life of the pipe joint under complex working conditions.

[0036] In one embodiment, see Figure 1 Along the axial direction of the retaining tube assembly 300, the limiting structure 400 is slidably connected to the retaining tube assembly 300. Thus, the limiting structure 400 has a limiting position for abutting against the connecting rod assembly 200, and an initial position spaced axially from this limiting position along the retaining tube assembly 300. The initial position may be located on the side of the limiting position away from the fixing tube 100. Therefore, in this embodiment, by controlling the axial movement of the limiting structure 400 relative to the retaining tube assembly 300, the limiting effect on the connecting rod assembly 200 can be selectively achieved or released.

[0037] Furthermore, in this embodiment, the movement of the limiting structure 400 between the initial position and the limiting position is controlled by the driving structure 500. Specifically, the driving structure 500 is connected to the retaining tube assembly 300 in a manner that allows it to move relative to the retaining tube assembly 300, and is disposed on the side of the limiting structure 400 away from the fixed tube 100, and the driving structure 500 is pultrusively connected to the limiting structure 400.

[0038] After the snap-fit ​​block 230 and the snap-fit ​​groove 310 are engaged, the drive structure 500 is manipulated to move axially relative to the snap-fit ​​tube assembly 300. This drives the limiting structure 400 to move from the initial position to the limiting position until it abuts against the connecting rod assembly 200, thereby creating axial limiting and motion constraint on the connecting rod assembly 200 and reliably maintaining the snap-fit ​​state.

[0039] Correspondingly, when it is necessary to release the locking state, the drive structure 500 can be manipulated in the reverse direction to retract the limiting structure 400 from the limiting position to the initial position, thereby releasing the limiting effect on the connecting rod assembly 200 and restoring the connecting rod assembly 200 to its swingable state, thus providing movement space for the locking block 230 to disengage from the locking groove 310. Therefore, in this embodiment, the limiting effect on the connecting rod assembly 200 or the release of the limiting effect on the connecting rod assembly 200 can be selectively achieved through the cooperation between the drive structure 500 and the limiting structure 400.

[0040] In one embodiment, see Figure 2 The locking tube assembly 300 includes a locking tube 320 and a control tube 330. One end of the locking tube 320 can be inserted into the fixing tube 100, and the locking groove 310 is formed on the outer peripheral surface of the locking tube 320. The control tube 330 is slidably sleeved on the other end of the locking tube 320 along the axial direction of the locking tube 320, and the outer peripheral surface of the control tube 330 is used to install the limiting structure 400 and the driving structure 500 to control the locking state.

[0041] Furthermore, combined Figure 3 and Figure 4 The connecting rod assembly 200 includes a first connecting rod 210 and a second connecting rod 220. The first connecting rod 210 is hinged to the control tube 330, for example, to the end of the control tube 330 facing the fixed tube 100; the second connecting rod 220 is hinged to the end of the first connecting rod 210 away from the control tube 330, and the other end of the second connecting rod 220 is hinged to the fixed tube 100, for example, to the end of the fixed tube 100 facing the control tube 330.

[0042] Specifically, the hinge axis between the first connecting rod 210 and the control tube 330, and the hinge axes between the second connecting rod 220 and the first connecting rod 210 and the fixed tube 100 respectively, are both perpendicular to the moving direction of the locking block 230. Simultaneously, the radial distance between the connecting ends of the first connecting rod 210 and the second connecting rod 220 relative to the outer circumference of the locking tube 320 is greater than the radial distance between the connecting ends of the first connecting rod 210 and the control tube 330 and the second connecting rod 220 and the fixed tube 100 relative to the outer circumference of the locking tube 320. This allows the first connecting rod 210 and the second connecting rod 220 to generate an amplified swing stroke relative to the locking tube 320 when the control tube 330 moves axially, thereby enabling the locking block 230 to move radially toward or away from the locking groove 310.

[0043] In this embodiment, a portion of the structure of the second connecting rod 220 is radially spaced from the locking groove 310. Therefore, the locking block 230 can be positioned on the side of the second connecting rod 220 facing the locking groove 310, thus providing structural space for the locking engagement between the locking block 230 and the locking groove 310. Therefore, in this embodiment, by manipulating the control tube 330 to move axially toward or away from the fixed tube 100, the first connecting rod 210 and the second connecting rod 220 can be linked and oscillate relative to the locking tube 320, thereby controlling the locking engagement or disengagement state between the locking block 230 and the locking groove 310.

[0044] It is understood that, in this embodiment, after the snap-fit ​​tube 320 and the fixed tube 100 are inserted and engaged, the operator can drive the control tube 330 to move in a direction away from the fixed tube 100, thereby causing the first connecting rod 210 and the second connecting rod 220 to swing, so that the snap-fit ​​block 230 is inserted into the snap-fit ​​groove 310, thereby achieving axial locking between the snap-fit ​​tube 320 and the fixed tube 100.

[0045] Furthermore, after the snap-fit ​​block 230 and the snap-fit ​​groove 310 are engaged, the aforementioned driving structure 500 drives the limiting structure 400 to move from the initial position to the limiting position, and abuts against the side of the first connecting rod 210 away from the snap-fit ​​groove 310. This restricts the retraction and swing of the first connecting rod 210 and the second connecting rod 220, preventing the snap-fit ​​block 230 from disengaging from the snap-fit ​​groove 310 under external force, and further improving the connection stability in the snap-fit ​​state.

[0046] In one embodiment, reference Figure 4 The inner surface of the control tube 330 has a plurality of strip-shaped guide protrusions 331 extending axially along the control tube 330, and are spaced apart circumferentially along the control tube 330. Correspondingly, in conjunction with... Figure 5 The retaining tube 320 has a plurality of strip-shaped guide grooves 321 that extend along its axial direction and at least penetrate the end of the retaining tube 320 facing away from the fixed tube 100. The plurality of strip-shaped guide protrusions 331 are inserted into and slidably engaged with the plurality of strip-shaped guide grooves 321, thereby restricting the control tube 330 from rotating relative to the retaining tube 320.

[0047] In this embodiment, the driving structure 500 can be implemented using any suitable structural form. See also Figure 2 In the embodiment shown, the drive structure 500 includes a rotating sleeve 510, which can be rotatably mounted on the clamping tube assembly 300 via a bearing, i.e., mounted on the control tube 330, so that it can only rotate around the axis of the clamping tube assembly 300.

[0048] An arc-shaped groove 520 is formed on the side wall of the rotating sleeve 510. The arc-shaped groove 520 extends along the circumferential direction of the rotating sleeve 510 and is inclined relative to the axial direction of the rotating sleeve 510. The inclined direction of the arc-shaped groove 520 is towards the limiting structure 400, thereby forming a motion channel on the circumferential side wall of the rotating sleeve 510 for guiding the limiting structure 400 to move axially.

[0049] Specifically, the limiting structure 400 includes a slider 420, which is at least partially inserted into the arc-shaped groove 520, and a sliding fit is formed between the slider 420 and the arc-shaped groove 520. When the rotating sleeve 510 rotates about the axis of the retaining tube assembly 300, the slider 420 slides along the corresponding extension direction of the arc-shaped groove 520 under the guidance of the arc-shaped groove 520, thereby converting the circumferential rotation of the rotating sleeve 510 into linear movement of the limiting structure 400 along the axial direction of the retaining tube assembly 300.

[0050] When the slider 420 slides to one end of the arc-shaped groove 520 near the limiting structure 400, the limiting structure 400 is correspondingly driven to a position abutting against the connecting rod assembly 200, that is, the limiting structure 400 is in the limiting position; when the slider 420 slides to one end of the arc-shaped groove 520 away from the limiting structure 400, the limiting structure 400 retracts to the initial position. In other words, the two ends of the arc-shaped groove 520 correspond to the initial position and the limiting position of the limiting structure 400, respectively.

[0051] Therefore, through the cooperation structure of the arc groove 520 and the slider 420, the operator only needs to apply a rotation operation to the rotating sleeve 510 to achieve precise control of the axial position of the limiting structure 400, thereby completing the establishment or release of the limiting state of the connecting rod group 200, effectively avoiding jamming or malfunction of the limiting structure 400 during the adjustment process, and improving the reliability of the limiting control.

[0052] In this embodiment, the slider 420 may be cylindrical.

[0053] In this embodiment, multiple connecting rod assemblies 200 may be provided and spaced circumferentially around the retaining tube 320. The arc-shaped groove 520 may penetrate the rotating sleeve 510, and multiple arc-shaped grooves 520 may be provided and spaced circumferentially around the rotating sleeve 510. Correspondingly, multiple sliders 420 may also be provided.

[0054] Combination Figure 3 The end of the limiting structure 400 facing the sliding sleeve may have a portion covered by the rotating sleeve 510 so that it can have a radially overlapping area with the rotating sleeve 510. In this case, the slider 420 can be evenly arranged in the portion covered by the rotating sleeve 510, so that it can slide and cooperate with the arc groove 520.

[0055] In this embodiment, the limiting structure 400 can be implemented using any suitable structural form. See also Figure 2 In the embodiment shown, the limiting structure 400 includes a limiting sleeve 410, which is sleeved on the clamping tube assembly 300, for example, on the outer periphery of the control tube 330.

[0056] Combination Figure 3 The limiting sleeve 410 has at least a portion located on the side of the arcuate groove 520 of the rotating sleeve 510 facing the retaining tube assembly 300, such that the limiting sleeve 410 at least partially overlaps with the rotating sleeve 510 in the radial direction. The slider 420 is formed on the outer peripheral surface of the overlapping portion, thereby allowing the slider 420 to be inserted into the arcuate groove 520 and form a sliding engagement relationship therewith, so as to transmit the rotational movement of the rotating sleeve 510 to the limiting sleeve 410.

[0057] Furthermore, when the connecting rod assembly 200 moves to the point where the locking groove 310 and the locking block 230 form a locking engagement, the limiting sleeve 410 can move axially along the locking tube assembly 300 and have its inner sidewall abut against the connecting rod assembly 200, thereby applying a limiting effect to the connecting rod assembly 200.

[0058] Specifically, during the engagement of the connecting rod assembly 200, the radial distance between the first connecting rod 210 and the outer circumferential surface of the control tube 330 gradually increases from its connection position with the control tube 330 towards the second connecting rod 220, eventually exceeding the radial distance between the inner wall of the limiting sleeve 410 and the outer circumferential surface of the control tube 330. Therefore, the inner wall of the limiting sleeve 410 can abut against the first connecting rod 210 at a position where the radial distance between the first connecting rod 210 and the outer circumferential surface of the control tube 330 is equal to the radial distance between the inner wall of the limiting sleeve 410 and the outer circumferential surface of the control tube 330, i.e., the limiting sleeve 410 reaches the aforementioned limiting position.

[0059] Therefore, during the axial movement of the limiting sleeve 410 along the snap-fit ​​tube assembly 300, it will not be interfered with or jammed due to the exposed hinge structure between the first connecting rod 210 and the control tube 330. This avoids limiting the axial travel of the limiting sleeve 410, and ensures that after the snap-fit ​​block 230 and the snap-fit ​​groove 310 complete the snap-fit ​​engagement, the limiting sleeve 410 can smoothly move to the position abutting against the first connecting rod 210, thereby achieving reliable limiting of the connecting rod assembly 200 and improving the stability and consistency of the limiting action.

[0060] In one embodiment, reference Figure 3 A stepped annular groove 332 may be formed on the outer peripheral surface of the control tube 330. The stepped annular groove 332 is recessed inward along the radial direction of the control tube 330, and the aforementioned limiting sleeve 410 can slide within the stepped annular groove 332. The stepped annular groove 332 includes a first annular groove and a second annular groove that are continuously arranged, and the groove depth of the first annular groove is smaller than that of the second annular groove to form a limiting step.

[0061] The first annular groove can be formed by setting the end of the rotating sleeve 510 facing the fixed tube 100 and the outer peripheral surface of the control tube 330 at intervals, and the second annular groove can be formed by opening an annular groove on the control tube 330. Based on this, the aforementioned limiting sleeve 410 can be partially located in the first annular groove and partially located in the second annular groove, so that the aforementioned limiting step can limit the movement distance of the limiting sleeve 410, that is, when the limiting sleeve 410 is in the initial position, it abuts against the side of the limiting step.

[0062] In one embodiment, reference Figure 3 and Figure 4 The pipe joint structure also includes a locking structure 600. This locking structure 600 is connected to the end of the rotating sleeve 510 opposite to the limiting structure 400. A locking groove 333 is formed on the outer circumferential surface of the clamping pipe assembly 300. The locking structure 600 includes a locking block 610, which penetrates the limiting structure 400 radially along the rotating sleeve 510 and can approach or move away from the clamping pipe assembly 300. By restricting the rotation of the rotating sleeve 510, the slider 420 is locked at the end of the arc-shaped groove 520, thereby ensuring that the limiting structure 400 can always stably remain in the predetermined limiting position, preventing the clamping block 230 from disengaging from the clamping groove 310 due to the swinging of the connecting rod assembly 200 caused by external force.

[0063] Furthermore, multiple locking blocks 610 may be provided and spaced apart circumferentially along the rotating sleeve 510. The locking block 610 may have a nail structure. The rotating sleeve 510 may include an annular locking ring plate 511, and the locking blocks 610 may be provided on the locking ring plate 511.

[0064] In this embodiment, reference Figure 2 and Figure 3 The locking block 610 is disposed at one end of the rotating sleeve 510 opposite to the limiting structure 400. Specifically, the end of the rotating sleeve 510 has an annular portion to support the locking block 610, and a first elastic element 630 is disposed between the locking block 610 and the rotating sleeve 510. The first elastic element 630 is preferably located between the top end of the locking block 610 and the rotating sleeve 510, providing a radially outward preload force to the locking block 610. The locking structure 600 also includes a drive assembly 620, which is partially threaded onto the outer peripheral surface of the retaining tube assembly 300. Along the radial direction of the retaining tube assembly 300, a portion of the structure of the drive assembly 620 is spaced apart from the outer peripheral surface of the retaining tube assembly 300, thereby forming an operating space that can accommodate the radial displacement of the locking block 610.

[0065] When the rotating sleeve 510 rotates until the slider 420 is located at the end of the arc-shaped groove 520 near the limiting structure 400, the drive assembly 620 is driven by screwing to move axially until it abuts against the end of the locking block 610 away from the retaining tube assembly 300. As the drive assembly 620 continues to move, it converts the axial thrust applied to the locking block 610 into a radial driving force, causing the locking block 610 to overcome the elastic force of the first elastic member 630 and move radially inward. Ultimately, this causes the locking block 610 to engage with the locking groove 333, thereby restricting the rotation of the rotating sleeve 510 relative to the control tube 330.

[0066] In one embodiment, the drive assembly 620 may include a threaded sleeve 621 and an abutment sleeve 622. The inner circumferential surface of the threaded sleeve 621 can be fitted onto the outer circumferential surface of the retaining tube assembly 300, i.e., the control tube 330, and is threadedly connected thereto, so that the threaded sleeve 621 can be rotated to move axially along the control tube 330. The abutment sleeve 622 is fitted onto the side of the threaded sleeve 621 facing the limiting structure 400 and is connected to the threaded sleeve 621. The abutment sleeve 622 has a portion spaced apart from the outer circumferential surface of the retaining tube assembly 300, so that when the locking block 610 is in its original position (i.e., not inserted into the locking groove 333), the inner surface of the abutment sleeve 622 can abut against the top of the locking block 610. The inner surface of the abutment sleeve 622 has a sliding groove formed therein. The groove extends axially along the abutment sleeve 622 and passes through one end of the abutment sleeve 622 toward the rotating sleeve 510. The locking block 610 is slidably connected to the sliding groove away from the top of the retaining tube assembly 300. The bottom surface of the sliding groove is arc-shaped and extends obliquely in the direction close to the retaining tube assembly 300, so that the locking block 610 can gradually press down the first elastic member 630 during the sliding process along the sliding groove and engage with the locking groove 333.

[0067] In this embodiment, reference Figures 2 to 4 The drive assembly 620 includes a threaded sleeve 621 and an abutment sleeve 622. The inner circumferential surface of the threaded sleeve 621 is fitted onto the outer circumferential surface of the control tube 330 and is threadedly connected to it. By rotating the threaded sleeve 621, it can be displaced along the axial direction of the control tube 330.

[0068] The abutment sleeve 622 is fitted onto the threaded sleeve 621 on the side facing the limiting structure 400 and is fixedly connected to it. Part of the structure of the abutment sleeve 622 is spaced apart from the outer peripheral surface of the locking tube assembly 300 to ensure that when the locking block 610 is in its original position without being inserted into the locking groove 333, its top end can contact the inner surface of the abutment sleeve 622.

[0069] The inner surface of the abutment sleeve 622 has a sliding groove extending axially and penetrating the end of the abutment sleeve 622 toward the rotating sleeve 510. The locking block 610, facing away from the top of the retaining tube assembly 300, can extend into the sliding groove from the end opening of the sliding groove and slide therewith. The bottom surface of the sliding groove is arc-shaped and extends inclinedly in the direction close to the retaining tube assembly 300 (i.e., toward the axis of the control tube 330). Therefore, when the threaded sleeve 621 drives the abutment sleeve 622 to move axially, the locking block 610 slides along the sliding groove and is gradually pressed by the inclined surface of its bottom, thereby overcoming the elastic force of the first elastic member 630 and generating an inward radial displacement, ultimately achieving insertion and engagement with the locking groove 333.

[0070] It should be mentioned that in this embodiment, the threaded sleeve 621 and the control tube 330 can form a threaded self-locking mechanism, so that the abutting sleeve 622 can continuously press down on the locking block 610; or other limiting structures 400 can be used to further restrict its rotation.

[0071] Furthermore, a thrust bearing 623 can be provided between the abutting sleeve 622 and the threaded sleeve 621. The abutting sleeve 622 and the threaded sleeve 621 can respectively abut against the two sides of the rolling element of the thrust bearing 623 to avoid the abutting sleeve 622 and the threaded sleeve 621 directly abutting against each other, which would cause the friction force that the rotation of the threaded sleeve 621 needs to overcome to be too large. It should be noted that the inner ring of the thrust bearing 623 does not need to be firmly fitted onto the control tube 330, and can have a certain small gap so that it can be pushed by the threaded sleeve 621.

[0072] In one embodiment, reference Figure 5 A sealing element 700 is provided between the clamping pipe assembly 300 and the fixed pipe 100. The sealing element 700 can seal between the clamping pipe assembly 300 and the fixed pipe 100 to improve the sealing performance between the clamping pipe assembly 300 and the fixed pipe 100.

[0073] In related technologies, while quick-connect fittings between some pipes simplify the installation process, they lack reliable locking mechanisms. During the operation of the heating system, thermal expansion and contraction can easily cause loosening and leakage accidents. These technical defects restrict the development of heating pipe networks towards rapid construction and safety and reliability.

[0074] Furthermore, the seal 700 may include an expansion ring 710 and a sealing ring 720. The expansion ring 710 may be disposed at the end face of the clamping tube assembly 300 where it is inserted into the fixing tube 100, i.e., reference... Figure 5It is disposed on the end face of the retaining tube 320. The sealing ring 720 is connected to the end face of the expansion ring 710 facing away from the retaining tube 320, and a sealing ring groove 721 is formed on the end of the sealing ring 720 facing away from the expansion ring 710. The inner side of the fixed tube 100 has an annular protrusion 110, which is inserted into and sealed with the sealing ring groove 721. The expansion ring 710 can expand when heated to prevent the clamping tube 320 and the fixed tube 100 from loosening due to thermal expansion and contraction, which could lead to leakage.

[0075] In this embodiment, the aforementioned fixed pipe 100 and clamping pipe 320 can be pipes that need to be spliced ​​at the construction site. Alternatively, they can be independent of the pipes that need to be spliced, and connected to the fixed pipe 100 and clamping pipe 320. Although embodiments of the invention have been described with reference to the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A pipe joint structure, characterized in that, include: A fixed tube (100) is hinged to a connecting rod assembly (200), and the connecting rod assembly (200) is connected to a snap-fit ​​block (230). A snap-fit ​​tube assembly (300) is inserted into the fixed tube (100) at one end, and the outer peripheral surface of the snap-fit ​​tube assembly (300) is formed with a snap-fit ​​groove (310) spaced apart from the fixed tube (100). The connecting rod assembly (200) is at least partially spaced from the snap-fit ​​groove (310) along the diameter direction of the snap-fit ​​tube assembly (300) on the outside of the snap-fit ​​tube assembly (300). The snap-fit ​​block (230) is located at a corresponding position on the side of the connecting rod assembly (200) facing the snap-fit ​​groove (310). The connecting rod assembly (200) is configured to be able to approach or move away from the snap-fit ​​groove (310). The snap-fit ​​tube assembly (300) is provided with a limiting structure (400). When the connecting rod assembly (200) moves to the snap-fit ​​block (230) and snap-fit ​​groove (310), the limiting structure (400) abuts against the side of the connecting rod assembly (200) away from the fixed tube (100) and restricts the connecting rod assembly (200) from moving in the direction away from the snap-fit ​​groove (310).

2. The pipe joint structure according to claim 1, characterized in that, Along the axial direction of the clamping pipe assembly (300), the limiting structure (400) is slidably connected to the clamping pipe assembly (300), and the pipe joint structure further includes: The drive structure (500) is movably connected to the snap-fit ​​tube assembly (300) and located on the side of the limiting structure (400) away from the fixed tube (100). The drive structure (500) is connected to the limiting structure (400). When the snap-fit ​​block (230) engages with the snap-fit ​​groove (310), the drive structure (500) moves relative to the snap-fit ​​tube assembly (300) and drives the limiting structure (400) to move to abut against the connecting rod assembly (200).

3. The pipe joint structure according to claim 2, characterized in that, The card take-up unit (300) includes: A snap-fit ​​connector (320) is inserted into the fixing tube (100) at one end, and a snap-fit ​​groove (310) is formed on the outer peripheral surface of the snap-fit ​​connector (320); The control tube (330) is slidably sleeved on the other end of the retaining tube (320) along the axial direction of the retaining tube (320), and the limiting structure (400) and the driving structure (500) are both connected to the outer peripheral surface of the control tube (330); The connecting rod assembly (200) includes a first connecting rod (210) and a second connecting rod (220). The first connecting rod (210) is hinged to the control tube (330). The other end of the first connecting rod (210) is hinged to the second connecting rod (220). The other end of the second connecting rod (220) is hinged to the fixed tube (100). The snap-fit ​​block (230) is located on the side of the second connecting rod (220) facing the snap-fit ​​groove (310). When the control tube (330) is manipulated to move away from the fixed tube (100), the first connecting rod (210) and the second connecting rod (220) move toward the snap-fit ​​tube (320).

4. The pipe joint structure according to claim 2, characterized in that, The drive structure (500) includes: A rotating sleeve (510) is rotatably fitted onto the clamping tube assembly (300), and an arc-shaped groove (520) is formed on the side wall surface of the rotating sleeve (510). The arc-shaped groove (520) extends obliquely along the circumference of the rotating sleeve (510) and toward the limiting structure (400). The limiting structure (400) includes a slider (420), which is at least partially inserted into the arc-shaped groove (520), and the slider (420) slides in cooperation with the arc-shaped groove (520). When the slider (420) slides to the end of the arc groove (520) near the end of the limiting structure (400), the limiting structure (400) abuts against the connecting rod group (200).

5. The pipe joint structure according to claim 4, characterized in that, The limiting structure (400) includes: A limiting sleeve (410) is fitted onto the retaining tube assembly (300) and is at least partially located on the side of the rotating sleeve (510) facing the retaining tube assembly (300) with the arcuate groove (520) facing the retaining tube assembly (300), and the slider (420) is formed on the outer peripheral surface of this portion; When the connecting rod assembly (200) moves to the snap-fit ​​groove (310) and snap-fit ​​block (230), the limiting sleeve (410) can move to its inner wall surface to abut against the connecting rod assembly (200).

6. The pipe joint structure according to claim 4, characterized in that, The pipe joint structure also includes: A locking structure (600) is connected to the end of the rotating sleeve (510) away from the limiting structure (400). A locking groove (333) is formed on the outer peripheral surface of the retaining tube assembly (300). The locking structure (600) includes a locking block (610). The locking block (610) passes through the limiting structure (400) radially along the rotating sleeve (510) and can approach or move away from the retaining tube assembly (300). When the slider (420) is located at the end of the arc groove (520) that is close to the limiting structure (400), the locking block (610) is driven to engage with the locking groove (333).

7. The pipe joint structure according to claim 6, characterized in that, The locking block (610) is disposed at the end of the rotating sleeve (510) opposite to the limiting structure (400), and a first elastic element (630) is disposed between the locking block (610) and the limiting structure (400). The locking structure (600) further includes: A drive assembly (620) is partially threaded onto the outer peripheral surface of the retaining tube assembly (300). Along the radial direction of the retaining tube assembly (300), the drive assembly (620) has a portion spaced apart from the outer peripheral surface of the retaining tube assembly (300). When the slider (420) is located at the end of the arc groove (520) near the limiting structure (400), the drive assembly (620) moves to contact the end of the locking block (610) away from the retaining tube assembly (300) and can drive the locking block (610) to compress the first elastic element (630) and engage with the locking groove (333).

8. The pipe joint structure according to claim 7, characterized in that, The driver kit (620) includes: A threaded sleeve (621) is fitted onto the retaining tube assembly (300) and threadedly connected to the outer circumferential surface of the retaining tube assembly (300). A retaining sleeve (622) is fitted onto the threaded sleeve (621) on the side facing the limiting structure (400) and connected to the threaded sleeve (621). The retaining sleeve (622) has a portion spaced apart from the outer peripheral surface of the retaining tube assembly (300). A sliding groove is formed on the inner side of the retaining sleeve (622). The sliding groove can extend along the axial direction of the retaining sleeve (622) and penetrate through one end of the retaining sleeve (622) facing the rotating sleeve (510). The locking block (610) is slidably connected to the sliding groove at one end away from the retaining tube assembly (300). The bottom surface of the sliding groove is arc-shaped and extends obliquely in the direction close to the retaining tube assembly (300).

9. The pipe joint structure according to claim 1, characterized in that, A sealing element (700) is provided between the clamping pipe assembly (300) and the fixed pipe (100), and the sealing element (700) can seal the clamping pipe assembly (300) and the fixed pipe (100).

10. The pipe joint structure according to claim 9, characterized in that, The seal (700) includes: An expansion ring (710) is disposed on the end face of the clamping tube assembly (300) inserted into the fixing tube (100); A sealing ring (720) is connected to the end face of the expansion ring (710) facing away from the retaining tube (320), and a sealing ring groove (721) is formed on the end of the sealing ring (720) facing away from the expansion ring (710). The inner side of the fixed tube (100) has an annular protrusion (110), which is inserted into and sealed with the sealing ring groove (721), and the expansion ring (710) can expand when heated.

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