An underground pipe joint structure

Abstract

The present invention relates to the technical field of buried pipe joints, and particularly relates to a buried pipe joint structure; it includes a casing; a connecting pipe is coaxially arranged in the middle of the inner cavity of the casing, and two sealing mechanisms that are symmetric about the connecting pipe left and right are arranged in the casing; the present invention replaces the traditional multi-component split design with an integrated sealing mechanism driven by a cam, greatly reducing the assembly complexity; through the cooperative sealing mechanism of the alternately arranged first pressing plate and the second pressing plate, a complete annular sealing surface without gaps is formed; combined with the quick locking design of the external thread ring and the internal thread cylinder, double sealing of the port and convenient maintenance are realized.

Description

Technical Field

[0001] The present invention relates to the technical field of buried pipe joints, and particularly relates to a buried pipe joint structure. Background Art

[0002] Buried pipes, as key infrastructure for transporting liquids or gases in municipal engineering and industrial facilities, are usually buried underground using materials such as steel pipes, ductile iron pipes, or polymer material pipes. Currently, the connection of buried pipes mainly relies on universal connectors, whose structure includes components such as valve bodies, gland nuts, open anti-disengagement rings, and retaining rings. During installation, the gland nut needs to be pushed into the pipe and the open anti-disengagement ring needs to be sleeved on. The conical surface is used to cooperate with the retaining ring for pre-tightening. Subsequently, the valve body is pushed into the pipe, initially fixed by flange bolts and the level is adjusted. Finally, the bolts are tightened diagonally to ensure sealing and firmness.

[0003] However, the following problems exist in the installation and use of the current universal connectors: 1. The existing universal connectors need to be disassembled into multiple independent parts and assembled in sequence. For example, the gland nut and the pipe need to be precisely aligned first, then the anti-disengagement ring is sleeved on and its conical surface direction is adjusted. Finally, the retaining ring and the valve body are installed. Due to the large number of parts and the need for separate operation of each component, the operator needs to repeatedly switch tools and process item by item, resulting in the stacking of installation steps and time consumption. Especially in narrow or damp underground working environments, it is difficult for the operator to efficiently complete the multi-step fine adjustment, resulting in a significant reduction in installation efficiency. 2. The universal connectors adopt a segmented gland nut and anti-disengagement ring design, resulting in inevitable gaps between adjacent gland nuts. Under long-term high-pressure or vibration working conditions, these gaps are prone to become weak points of leakage. For example, pressure fluctuations of liquids or gases may cause micro-displacements between the segmented gland nuts, further increasing the leakage risk.

[0004] Therefore, how to simplify the multi-component assembly process of buried pipe connectors to improve installation efficiency and overcome the leakage risk caused by gaps in the segmented sealing design is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of the above problems, an embodiment of the present application provides a buried pipe joint structure to solve the above-mentioned technical problems.

[0006] In order to achieve the above-mentioned purpose, the embodiment of the present application provides the following technical solutions: the embodiment of the present application provides a buried pipe joint structure, a buried pipe joint structure, including a casing; characterized in that: a connecting pipe is coaxially arranged in the middle of the inner cavity of the casing, and two groups of sealing mechanisms are arranged in the casing that are symmetrical about the connecting pipe; wherein: the sealing mechanism includes a No. 1 pressure plate and a No. 2 pressure plate, and the No. 1 pressure plate and the No. 2 pressure plate are evenly and alternately arranged in the casing along its circumference, and both of them slide along the radial direction of the casing, the No. 1 pressure plate and the No. 2 pressure plate are both arc structures, and the longitudinal section of the No. 2 pressure plate is a T-shaped structure, and the No. 1 pressure plate and the No. 2 pressure plate are both provided with sealing gaskets on one side close to the axis of the casing, and a cam corresponding to the No. 1 pressure plate and the No. 2 pressure plate is rotatably installed on the casing, and the outer sleeve of one of the buried pipes is provided with an external threaded ring, and the outer sleeve of the other buried pipe is provided with an internal threaded cylinder matching the external threaded ring.

[0007] After the two buried pipes are respectively inserted at both ends of the casing, first rotate the cam corresponding to the No. 1 pressure plate, and the cam squeezes the No. 1 pressure plate to fit tightly against the buried pipe and the connecting pipe. After the No. 1 pressure plate squeezes the buried pipe, rotate the cam corresponding to the No. 2 pressure plate to cause the No. 2 pressure plate to press the buried pipe and the connecting pipe, and overlap and cover the gap between the adjacent No. 1 pressure plates to form a complete annular sealing surface. Finally, the internal threaded tube cooperates with the external threaded ring to achieve port sealing of the casing and the buried pipe.

[0008] As a preferred solution, the sleeve is provided with rectangular grooves corresponding to the No. 1 pressure plate and the No. 2 pressure plate, and the cam is rotatably installed in the rectangular groove through a shaft column, and a handle is installed on the shaft column.

[0009] As a preferred solution, a connecting block is fixedly installed at one end of the No. 1 pressure plate away from the axis of the sleeve, and both the end of the connecting block away from the No. 1 pressure plate and the end of the No. 2 pressure plate away from the axis of the sleeve are provided with grooves that interfere with the outer ring wall of the cam.

[0010] As a preferred solution, two left-right symmetrical limit rods are fixedly installed on the end of the connecting block away from the No. 1 pressure plate and the end of the No. 2 pressure plate away from the axis of the sleeve. The limit rods slide through the sleeve, and a tension spring mounted on the corresponding limit rod is installed between the sleeve and the corresponding No. 1 pressure plate or No. 2 pressure plate.

[0011] As a preferred solution, conical sealing sleeves are coaxially installed on both ends of the sleeve, and limiting columns are evenly installed on the right end of the external threaded ring along its circumference. A limiting groove corresponding to the limiting column is opened at the left end of the sleeve, and the limiting column slides through the conical sealing sleeve into the limiting groove. Conical holes that cooperate with the conical sealing sleeve are opened on the external threaded ring and the right end of the internal threaded tube.

[0012] As a preferred solution, the cam is in a D-shaped structure, and the arc section of the cam is divided into three sections. The arc section in the middle of the cam is concentric with the shaft column, and the arc sections on both sides are eccentric with respect to the shaft column.

[0013] As a preferred solution, circular grooves are evenly formed in the circumferential direction of the sleeve on the right end face of the external thread ring and the left end face of the internal thread cylinder.

[0014] One or more of the above technical solutions in the embodiments of the present invention have at least one of the following technical effects: First, the present invention replaces the traditional multi-component split design with an integrated sealing mechanism driven by a cam, greatly reducing the assembly complexity; through the cooperative sealing mechanism of the alternately arranged first pressing plate and the second pressing plate, a complete annular sealing surface without gaps is formed; combined with the quick locking design of the external thread ring and the internal thread cylinder, dual sealing of the port and convenient maintenance are realized.

[0015] Second, in the present invention, by rotating the corresponding cam, the radial displacements of the first pressing plate and the second pressing plate can be controlled in sequence, without repeatedly adjusting bolts or nesting multiple independent components, greatly shortening the installation time. In addition, the reset design of the tension spring and the limiting rod ensures the stability and repeatability of the actions of the first pressing plate and the second pressing plate, and even in complex working conditions, the sealing and pressing can be quickly completed, significantly improving the construction efficiency and reducing the labor cost.

[0016] Third, after the first pressing plate completes the preliminary pressing, the second pressing plate is further displaced by the drive of the cam, and its arc-shaped structure precisely covers the gap between adjacent first pressing plates, forming a complete annular sealing surface without interruption. Combined with the sealing gasket design on the inner sides of the first pressing plate and the second pressing plate, elastic deformation occurs when pressed, further filling the microscopic uneven areas, ensuring uniform pressure transmission on the contact surface, and in the D-shaped structure of the cam, after the arc segment rotates to the pressing position, its geometric characteristics form a self-locking effect, preventing accidental retraction caused by vibration or external load, ensuring the fixed positions of the first pressing plate and the second pressing plate, thereby improving the sealing reliability and durability of the joint during long-term use.

[0017] The additional aspects and advantages of the present invention will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0019] Figure 1 It is a three-dimensional structural schematic diagram when the buried pipes are connected in the present invention.

[0020] Figure 2 It is Figure 1 a cross-sectional view of

[0021] Figure 3 for Figure 1 Schematic diagram of the structure after cutting part of the internal threaded barrel.

[0022] Figure 4 It is a partial structural schematic diagram of the sealing mechanism of the present invention.

[0023] Figure 5 This is a diagram showing the changes before and after the No. 1 and No. 2 pressure plates press the buried pipe.

[0024] Figure numerals: 10, sleeve; 11, connecting pipe; 2, sealing mechanism; 20, pressure plate No. 1; 21, pressure plate No. 2; 22, cam; 220, rectangular groove; 221, handle; 30, external thread ring; 300, limiting column; 301, limiting groove; 31, internal thread cylinder; 32, circular groove; 200, connecting block; 201, groove; 202, limiting rod; 203, tension spring; 110, conical sealing sleeve. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0026] like Figure 1 , Figure 2 and Figure 3 As shown, a buried pipe joint structure includes a casing 10; a connecting pipe 11 is coaxially fixedly arranged in the middle of the inner cavity of the casing 10, there is a distance between the casing 10 and the connecting pipe 11, and two groups of sealing mechanisms 2 are arranged in the casing 10 that are symmetrical about the connecting pipe 11.

[0027] like Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the sealing mechanism 2 includes a No. 1 pressure plate 20 and a No. 2 pressure plate 21. The No. 1 pressure plate 20 and the No. 2 pressure plate 21 are evenly and alternately arranged in the circumference of the sleeve 10, and both slide radially along the sleeve 10. The No. 1 pressure plate 20 and the No. 2 pressure plate 21 are both arc-shaped structures, and the longitudinal section of the No. 2 pressure plate 21 is a T-shaped structure. The No. 1 pressure plate 20 and the No. 2 pressure plate 21 are both provided with sealing gaskets on one side close to the axis of the sleeve 10, and a cam 22 corresponding to the No. 1 pressure plate 20 and the No. 2 pressure plate 21 is rotatably installed on the sleeve 10. An external threaded ring 30 is provided on the left side of the sleeve 10, and an internal threaded cylinder 31 matching the external threaded ring 30 is provided on the right side of the sleeve 10.

[0028] As Figure 2 , Figure 3 and Figure 4 shown, rectangular grooves 220 corresponding one by one to the first pressing plate 20 and the second pressing plate 21 are formed in the casing 10. A cam 22 is rotatably installed in the rectangular groove 220 through a shaft column, and a handle 221 is installed on the shaft column.

[0029] As Figure 4 shown, a connecting block 200 is fixedly installed at one end of the first pressing plate 20 away from the axis of the casing 10. Grooves 201 that abut against the outer ring wall of the cam 22 are formed at one end of the connecting block 200 away from the first pressing plate 20 and at one end of the second pressing plate 21 away from the axis of the casing 10.

[0030] As Figure 2 , Figure 3 and Figure 4 shown, two symmetrically arranged limiting rods 202 are fixedly installed at one end of the connecting block 200 away from the first pressing plate 20 and at one end of the second pressing plate 21 away from the axis of the casing 10. The limiting rods 202 slidably penetrate through the casing 10, and a tension spring 203 sleeved on the corresponding limiting rod 202 is installed between the casing 10 and the corresponding first pressing plate 20 or second pressing plate 21.

[0031] As Figures 1 to 5 shown, during specific operation, manually first sleeved the external thread ring 30 and the internal thread cylinder 31 on the corresponding two buried pipes respectively, then inserted the two buried pipes into both ends of the casing 10, and made the end surfaces of the buried pipes abut against the connecting pipe 11. Then first rotate the handle 221 on the cam 22 corresponding to the first pressing plate 20. The handle 221 drives the cam 22 to rotate through the shaft column. The cam 22 abuts against the groove 201 and pushes the first pressing plate 20 to move towards the connecting pipe 11. The first pressing plate 20 preliminarily presses and seals the connection between the buried pipe and the connecting pipe 11 through the corresponding sealing gasket.

[0032] After all the first pressing plates 20 complete the pressing and sealing, then rotate the handle 221 on the cam 22 corresponding to the second pressing plate 21. The handle 221 drives the cam 22 to rotate through the shaft column. The cam 22 abuts against the groove 201 and pushes the second pressing plate 21 to move towards the connecting pipe 11. The second pressing plate 21 presses and seals the part of the connection seam between the buried pipe and the connecting pipe 11 that is not covered by the first pressing plate 20 through the sealing gasket, and the second pressing plate 21 squeezes and covers the gap between the adjacent first pressing plates 20, so that the first pressing plate 20 and the second pressing plate 21 form a complete annular sealing surface, thereby ensuring the sealing performance of the connection between the buried pipe and the connecting pipe 11.

[0033] As Figure 2 and Figure 4As shown, the cam 22 has a D-shaped structure. The arc section of the cam 22 is divided into three segments. The arc section in the middle of the cam 22 is concentric with the shaft column, and the arc sections on both sides are eccentric with respect to the shaft column.

[0034] As Figure 1 , Figure 2 and Figure 3 As shown, circular grooves 32 are evenly formed in the circumferential direction on the left end face of the external thread ring 30 and the right end face of the internal thread cylinder 31 along the sleeve 10.

[0035] As Figure 1 , Figure 2 and Figure 3 As shown, tapered sealing sleeves 110 are coaxially and fixedly installed at both the left and right ends of the sleeve 10. Limited position posts 300 are evenly installed along the circumferential direction at the right end of the external thread ring 30. Limited position grooves 301 corresponding to the limited position posts 300 one by one are formed at the left end of the sleeve 10. The limited position posts 300 slide through the tapered sealing sleeve 110 to the inside of the limited position grooves 301. Tapered holes matching the tapered sealing sleeve 110 are formed on both the external thread ring 30 and the right end of the internal thread cylinder 31.

[0036] As Figure 2 and Figure 4 As shown, during specific operation, when the handle 221 drives the cam 22 to rotate through the shaft column, the eccentric arc section of the cam 22 first contacts the groove 201, and as the cam 22 rotates, it pushes the corresponding first pressing plate 20 or second pressing plate 21 towards the connecting pipe 11. After the middle of the arc section of the cam 22 abuts against the groove 201, at this time, the first pressing plate 20 or the second pressing plate 21 is in close contact with the connecting pipe 11. Then, the handle 221 and the cam 22 further rotate a certain angle. During this process, the rotation angle of the handle 221 does not exceed 180 degrees. Compared with the traditional bolt fixation that requires multiple turns of rotation to complete tightening, the operation time and labor cost are significantly reduced. The first pressing plate 20 and the second pressing plate 21 keep in close contact with the connecting pipe 11, and the geometric characteristics of the cam 22 form a self-locking effect, preventing accidental retraction caused by vibration or external load, and ensuring the fixed positions of the first pressing plate 20 and the second pressing plate 21.

[0037] Manually move the external thread ring 30 towards the casing 10. The external thread ring 30 passes through the corresponding conical sealing sleeve 110 through the limit post 300 and into the corresponding limit groove 301, so that the external thread ring 30 and the casing 10 form an integral whole, thereby restricting the circumferential rotation of the external thread ring 30. Then move the internal thread cylinder 31 towards the casing 10. The threaded section of the internal thread cylinder 31 cooperates with the threaded section of the external thread ring 30. After that, insert an external tool (such as a pin rod) into the circular groove 32 on the external thread ring 30 to facilitate applying force to restrict the rotation of the external thread ring 30 and the casing 10, and avoid the rotation of the external thread ring 30 and the casing 10 when installing the internal thread cylinder 31. Then insert another external pin rod into the circular groove 32 of the internal thread cylinder 31 to facilitate applying force to drive the internal thread cylinder 31 to rotate, so that the internal thread cylinder 31 rotates and axially moves at the same time. During the movement, the corresponding conical sealing sleeve 110 is squeezed through the conical hole. The cooperation of the conical structure generates a radial expansion force through axial compression, forcing the inner wall of the conical sealing sleeve 110 to closely fit the outer wall of the buried pipe, so as to achieve the sealing of both ends of the casing 10, thereby reducing the entry of external liquid, and further extending the service life of the sealing mechanism 2. In addition, the internal thread cylinder 31 restricts the rotation of the handle 221, thus ensuring the sealing performance of the first pressing plate 20 and the second pressing plate 21 at the connection between the buried pipe and the connecting pipe 11.

[0038] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description. Without contrary instructions, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the protection scope of the present invention; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0039] In addition, the terms "first", "second", "No. 1", "No. 2" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", "No. 1", "No. 2" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0040] In the description of the present invention, it should also be noted that, unless otherwise clearly specified and defined, the terms "arranged", "connected", "installed", and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] The embodiments of this specific implementation manner are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A buried pipe joint structure, comprising a casing; characterized in that: A connecting pipe is coaxially arranged in the middle of the inner cavity of the casing, and two sealing mechanisms that are symmetric about the connecting pipe left and right are arranged in the casing; among them: The sealing mechanism includes a first pressing plate and a second pressing plate. The first pressing plates and the second pressing plates are uniformly and alternately arranged along the circumferential direction of the casing. Both of them slide along the radial direction of the casing. The first pressing plate and the second pressing plate are both arc-shaped structures, and the longitudinal section of the second pressing plate is in a T-shaped structure. Sealing gaskets are arranged on the sides of the first pressing plate and the second pressing plate close to the axis of the casing. Cam wheels corresponding to the first pressing plate and the second pressing plate are rotatably installed on the casing. An external thread ring is sleeved outside one of the buried pipes, and an internal thread cylinder matched with the external thread ring is sleeved outside the other buried pipe; After the two buried pipes are respectively inserted into the two ends of the casing, first rotate the cam wheel corresponding to the first pressing plate, and the cam wheel then presses the first pressing plate against the buried pipe and the connecting pipe tightly. After all the first pressing plates press the buried pipe, then rotate the cam wheel corresponding to the second pressing plate to urge the second pressing plate to press the buried pipe and the connecting pipe tightly, and overlap and cover the gaps between the adjacent first pressing plates to form a complete annular sealing surface. Finally, the internal thread cylinder is matched with the external thread ring to realize the port sealing of the casing and the buried pipe.

2. The buried pipe joint structure according to claim 1, characterized in that: Rectangular grooves corresponding to the first pressing plate and the second pressing plate are opened on the casing. The cam wheel is rotatably installed in the rectangular groove through a shaft column, and a handle is installed on the shaft column.

3. The buried pipe joint structure according to claim 1, characterized in that: A connecting block is fixedly installed at one end of the first pressing plate away from the axis of the casing. Grooves that are in contact with the outer ring wall of the cam wheel are opened at one end of the connecting block away from the first pressing plate and at one end of the second pressing plate away from the axis of the casing.

4. The buried pipe joint structure according to claim 3, characterized in that: Two symmetrically arranged limit rods are fixedly installed at one end of the connecting block away from the first pressing plate and at one end of the second pressing plate away from the axis of the casing. The limit rods slide through the casing, and a tension spring sleeved on the corresponding limit rod is installed between the casing and the corresponding first pressing plate or second pressing plate.

5. The buried pipe joint structure according to claim 1, characterized in that: Conical sealing sleeves are coaxially installed at the left and right ends of the casing. Limit columns are uniformly installed along the circumferential direction at the right end of the external thread ring. Limit grooves corresponding to the limit columns are opened at the left end of the casing. The limit columns slide through the conical sealing sleeve into the limit grooves. Conical holes matched with the conical sealing sleeve are opened on the external thread ring and at the right end of the internal thread cylinder.

6. The buried pipe joint structure according to claim 1, characterized in that: The cam wheel is in a D-shaped structure. The arc section of the cam wheel is divided into three sections. The arc section in the middle of the cam wheel is concentric with the shaft column, and the arc sections on both sides are eccentric with respect to the shaft column.

7. The buried pipe joint structure according to claim 1, characterized in that: Circular grooves are uniformly opened along the circumferential direction of the right end face of the external thread ring and the left end face of the internal thread cylinder.

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