A pipe connection joint capable of preventing thermal expansion and contraction

Abstract

The utility model provides a pipeline connecting joint of preventing thermal expansion and cold shrink, it is including: casing, casing is semicircular structure and is equipped with connecting part on both sides, sealing ring, sealing ring is inside casing, there is cavity in sealing ring, oil injection pipe is connected with cavity, there is piston in oil injection pipe, piston top connects piston rod, clamp, there is card tooth on the clamp, card tooth is connected on the clamp slidingly, connecting rod mechanism, connecting rod mechanism is connected with piston rod in clamp and sealing ring, support frame, support frame is outside casing, connecting rod mechanism is on support frame, the utility model provides a pipeline connecting joint of preventing thermal expansion and cold shrink, can prevent the problem that pipeline collision and sealing are not strict caused by pipeline thermal expansion and cold shrink due to temperature change, and casing is rigid structure, has the strength and stability of rigid joint.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of pipe joints, in particular to a pipe connecting joint capable of preventing thermal expansion and cold contraction. BACKGROUND

[0002] Pipe connecting joints are generally divided into rigid joints and flexible joints. The rigid joint can tightly connect the pipes, but the connected pipes cannot be displaced. The flexible joint allows the connected pipes to axially stretch or deflect. After the temperature changes, the pipes will expand or contract axially, which may cause pipe extrusion deformation or sealing problems. Therefore, the flexible joint is generally used for connection.

[0003] The pipe joint disclosed in the prior art, such as Chinese Patent CN 217302016 U, belongs to a rigid joint. The pipe connecting strength is high, the stability is strong, and the installation and use are convenient. However, the joint cannot prevent the expansion and contraction caused by thermal expansion and cold contraction, and is prone to pipe extrusion deformation or sealing problems.

[0004] The groove flexible joint disclosed in Chinese Patent CN 111623181 A belongs to a flexible joint. The two sealing members are connected by a rubber hose to connect the pipes. The joint has a certain variability, which can effectively prevent the axial expansion and contraction of the pipes caused by thermal expansion and cold contraction. However, the strength and stability of the rubber hose soft connection are relatively insufficient.

[0005] In summary, both rigid joints and flexible joints have advantages and disadvantages. Therefore, it is necessary to combine the advantages of the two types of joints and eliminate the disadvantages of the two types of joints to propose a pipe connecting joint that has the strength and stability of a rigid joint and the variability of a flexible joint. SUMMARY

[0006] The purpose of the present application is to propose a pipe connecting joint capable of preventing thermal expansion and cold contraction, preventing the expansion and contraction caused by thermal expansion and cold contraction, and preventing pipe extrusion deformation or sealing problems, while maintaining the strength and stability of a rigid joint.

[0007] A pipe connecting joint capable of preventing thermal expansion and cold contraction comprises a shell, the shell is in a semicircular structure and has connecting portions on both sides, and the connecting portions have threaded holes;

[0008] A sealing ring is arranged inside the shell, the sealing ring has a cavity, an oil injection pipe is connected to the cavity, the oil injection pipe has a piston, and the piston is connected to a piston rod;

[0009] A clamp is in a semicircular structure, the clamp is arranged inside the shell, the clamp has a clamping tooth, and the clamping tooth is slidingly connected to the clamp;

[0010] A connecting rod mechanism connected to the piston rod in the clamp and the sealing ring;

[0011] A support frame is located outside the shell, and the connecting rod mechanism is on the support frame.

[0012] Preferably, the connecting rod mechanism includes a vertical rod, a horizontal rod, and a slider, wherein one end of the vertical rod is connected to the tooth and the other end is connected to the horizontal rod, the horizontal rod is connected to the slider, the slider has a limit rod inside, and the limit rod is connected to the piston rod. The connecting rod mechanism is used to connect the tooth in the clamp and the sealing ring piston rod.

[0013] Preferably, the housing has a sliding groove, the vertical rod is in the sliding groove, and there are scale lines next to the sliding groove. The scale lines can be used to show the position changes of the teeth after the pipeline expands and contracts with temperature changes, which is helpful for laying and repairing pipelines.

[0014] Preferably, the slider is provided with an inclined limiting groove, and the limiting rod is in the limiting groove. The limiting rod and the limiting groove control the up and down movement of the piston rod.

[0015] Preferably, the support frame includes a support ring, a support block and a column, wherein the support ring surrounds the outer side of the shell, the two ends of the support ring are arranged on the connecting portion, the column connects the shell and the support ring, and the support block is on the support ring. The support frame is used to support the connecting rod structure.

[0016] Preferably, a slideway is provided in the support block, the extension direction of the slideway is the same as the direction of the joint axis, and the cross bar is arranged in the slideway.

[0017] Preferably, rubber corrugated pads are provided on both sides of the clamping teeth in the clamp, and a spring is provided at the bottom of the clamping teeth. As the metal pipe axially expands and contracts, the clamping teeth compress the rubber corrugated pads and slide in the clamping teeth. The spring enables the clamping teeth to grip the pipe slot while providing a certain degree of vibration resistance.

[0018] Preferably, a positioning post is provided inside the housing and a positioning hole is provided outside the sealing ring, and the positioning post cooperates with the positioning hole. The positioning post and the positioning hole facilitate alignment of the sealing ring and the housing, and facilitate installation.

[0019] Preferably, there are two shells, which are symmetrically arranged and fastened together using bolts passing through threaded holes.

[0020] Preferably, the sealing ring is a double V-shaped sealing ring, with a limiting protrusion in the middle of the sealing ring, and two cavities are symmetrically arranged in the limiting protrusion, and the cavities are filled with hydraulic oil.

[0021] Beneficial effects:

[0022] 1. The present invention provides a pipe connection joint that is resistant to thermal expansion and contraction. The shell is a rigid structure, which maintains the high strength and stability of the rigid joint. At the same time, it can prevent pipe collision and poor sealing caused by thermal expansion and contraction of the pipe due to temperature changes, and has a certain seismic resistance.

[0023] 2. Temperature changes can cause pipe expansion and contraction, and the grooves on grooved pipes can shift. This movement can collide with the clamps, potentially causing the pipes to fall out. In this invention, the clamps are designed as flexible connections with rubber bellows on either side. When the grooves shift, the clamps compress the rubber bellows and slide, preventing them from colliding with the grooves. This eliminates the problem of pipe collisions caused by thermal expansion and contraction, improving connection security.

[0024] 3. When the pipe expands or contracts, the expansion rate of the metal is greater than that of the rubber seal. Therefore, when the metal pipe contracts when it is cold and the length exceeds the elastic range of the rubber seal, the metal pipe will separate from the rubber seal, resulting in a poor seal. In the present invention, a cavity is provided in the seal ring and filled with hydraulic oil. When the metal pipe contracts and separates from the rubber seal ring, the piston compresses the hydraulic oil in the cavity, causing the hydraulic oil to expand the rubber seal ring, allowing it to continue to adhere to the metal pipe and maintain the sealing effect.

[0025] 4. To enable the sealing ring cavity to automatically expand and contract according to the expansion and contraction of the pipe, the present invention connects the teeth on the clamp to the piston on the sealing ring through a linkage mechanism. When the pipe expands due to heat, the teeth move inward along the groove. The vertical rod on the teeth drives the crossbar and slider to slide inward. The limit groove causes the limit rod and piston rod to move upward. The piston moves upward, and the sealing ring contracts, sealing the metal pipe with its own elasticity. When the pipe contracts due to cold, the teeth move outward along the groove. The vertical rod on the teeth drives the crossbar and slider to slide outward. The limit groove causes the limit rod and piston rod to move downward. The piston compresses the cavity downward, and the volume of the hydraulic oil remains unchanged, forcing the sealing ring to expand and compress the pipe to maintain the seal.

[0026] 5. Through the cooperation of springs, rubber gaskets, connecting rod mechanisms and sealing rings, the joint has a certain ability to resist shock. At the same time, when the pipeline is deflected at an angle due to vibration, it can still maintain sealing and prevent the pipeline from leaking.

[0027] 6. The oil filling pipe of the sealing ring and the hole on the housing must be aligned, which is inconvenient during installation. Therefore, a positioning column is set inside the housing and a positioning hole is set outside the sealing ring. The positioning column and the positioning hole match each other. When the positioning column is inserted into the positioning hole, the oil filling pipe on the sealing ring is aligned with the hole on the housing, which facilitates the quick installation of the joint and prevents the sealing ring from rotating inside the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only constitute some embodiments of the present application, and other accompanying drawings can be obtained by those skilled in the art without any creative effort on the basis of these accompanying drawings.

[0029] Figure 1 Structure diagram of an embodiment of the pipeline connecting joint provided by the present application.

[0030] Figure 2 Exploded diagram of an embodiment of the pipeline connecting joint provided by the present application.

[0031] Figure 3 Sectional view of an embodiment of the pipeline connecting joint provided by the present application.

[0032] Figure 4 Local enlarged view of an embodiment of the pipeline connecting joint provided by the present application.

[0033] Figure 5 Pipeline assembly sectional view of an embodiment of the pipeline connecting joint provided by the present application.

[0034] Figure 6 Pipeline vibration deflection angle diagram of an embodiment of the pipeline connecting joint provided by the present application.

[0035] In the figure: 1 - shell, 11 - connecting part, 12 - threaded hole, 13 - sliding groove, 14 - scale line, 15 - positioning column;

[0036] 2 - sealing ring, 21 - cavity, 22 - oil injection pipe, 23 - piston, 24 - piston rod, 25 - limiting protrusion, 26 - positioning hole;

[0037] 3 - clamp, 31 - clamping tooth, 32 - rubber corrugated pad, 33 - spring;

[0038] 4 - connecting rod mechanism, 41 - vertical rod, 42 - horizontal rod, 43 - sliding block, 44 - limiting rod, 45 - limiting groove;

[0039] 5 - support frame, 51 - support ring, 52 - support block, 53 - stand column. DETAILED DESCRIPTION

[0040] The present invention may be more readily understood by referring to the following detailed description of preferred embodiments of the present invention and the included Examples. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention pertains. In the event of a conflict, the definitions in this specification shall prevail.

[0041] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "connection" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0042] Example 1:

[0043] In order to quickly replace branch pipes with different diameters without having to re-drill holes in the pipes, the following Figure 1-4 The shown embodiment is a pipe connection joint that is resistant to thermal expansion and contraction, comprising: a shell 1, which has a semicircular structure and is provided with connecting parts 11 on both sides, and the connecting parts 11 have threaded holes; a sealing ring 2, which is inside the shell 1, and has a cavity 21 inside the sealing ring 2, and the cavity 21 is connected to an oil filling pipe 22, and a piston 23 is inside the oil filling pipe 22, and a piston rod 24 is connected above the piston 23; a clamp 3, which has a semicircular structure and is inside the shell 1, and has a tooth 31 on the clamp 3, and the tooth 31 is slidably connected to the clamp 3; a connecting rod mechanism 4, which is connected to the clamp 3 and the piston rod 24 in the sealing ring 2; a support frame 5, which is outside the shell 1, and the connecting rod mechanism 4 is on the support frame 5.

[0044] The connecting rod mechanism 4 includes a vertical rod 41, a horizontal rod 42, and a slider 43. One end of the vertical rod 41 is connected to the tooth 31, and the other end is connected to the horizontal rod 42. The horizontal rod 42 is connected to the slider 43. The slider 43 has a limit rod 44 inside it, which is connected to the piston rod 24. The slider 43 has an inclined limit groove 45, in which the limit rod 44 is located. The connecting rod mechanism 4 is used to connect the tooth 31 in the clamp 3 with the piston rod 24 of the sealing ring 2. When the tooth 31 moves leftward, the vertical rod 41 drives the horizontal rod 42 and slider 43 to the left, and the limit groove 45 causes the limit rod 44 and piston rod 24 to move downward. When the tooth 31 moves rightward, the vertical rod 41 drives the horizontal rod 42 and slider 43 to the right, and the limit groove 45 causes the limit rod 44 and piston 23 to move upward.

[0045] The housing 1 has a sliding groove 13, in which the vertical rod 41 is located. Scale lines 14 are provided beside the sliding groove 13. The scale lines 14 show the positional changes of the teeth 31 due to thermal expansion and contraction of the pipe as it changes temperature, which helps in laying and repairing the pipe.

[0046] The support frame 5 comprises a support ring 51, a support block 52, and a column 53. The support ring 51 surrounds the outside of the housing 1, with both ends attached to the connecting portion 11. The column 53 connects the housing 1 and the support ring 51, and the support block 52 is attached to the support ring 51. A slideway is located within the support block 52, extending in the same direction as the joint axis. The crossbar 42 is mounted within the slideway. The support frame 5 supports the linkage 4.

[0047] Rubber corrugated pads 32 are installed on both sides of the teeth 31 in the clamp 3, and a spring 33 is installed at the bottom of the teeth 31. As the metal pipe expands and contracts axially, the teeth 31 compress the rubber corrugated pads 32 and slide inside the clamp 3. The spring 33 makes the teeth 31 bite the pipe groove tightly while providing a certain resistance to vibration.

[0048] There is a positioning column 15 inside the housing 1 and a positioning hole 26 outside the sealing ring 2. The positioning column 15 cooperates with the positioning hole 26. The positioning column 15 and the positioning hole 26 are convenient for aligning the position of the sealing ring 2 and the housing 1, which is convenient for installation.

[0049] There are two shells 1 , which are symmetrically arranged and fastened together using bolts passing through threaded holes.

[0050] The sealing ring 2 is a double V-shaped sealing ring with a limiting protrusion 25 in the middle of the sealing ring 2. Two cavities 21 are symmetrically arranged in the limiting protrusion 25. The cavities 21 are filled with hydraulic oil.

[0051] Working principle: Figure 5 As shown, when the metal pipe expands due to heat, it will elongate, and the groove position will move toward the center of the joint. The tooth 31 will compress the rubber corrugated pad 32 and move with the groove position. The vertical rod 41 on the tooth 31 drives the cross bar 42 and the slider 43 to move toward the center of the joint. The limiting groove 45 causes the limiting rod 44 and the piston rod 24 to move upward, the piston 23 moves upward, the cavity 21 shrinks, and the sealing ring 2 seals the metal pipe through its own elasticity; when the metal pipe shrinks due to cold, it will shorten, and the groove position will move away from the center of the joint. The tooth 31 will compress the rubber corrugated pad 32 and move with the groove position. The vertical rod 41 on the tooth 31 drives the cross bar 42 and the slider 43 to move away from the center of the joint. The limiting groove 45 causes the limiting rod 44 and the piston rod 24 to move downward, the piston 23 moves downward, forcing the cavity 21 to expand, tightening the pipe and maintaining the sealing.

[0052] The scale lines 14 on the housing 1 can be used to understand the position changes of the locking teeth 31 after the pipeline expands and contracts, which is helpful for laying and repairing the pipeline.

[0053] The positioning posts 15 on the housing 1 and the positioning holes 26 on the sealing ring 2 facilitate alignment of the sealing ring 2 and the housing 1 , thereby facilitating installation.

[0054] like Figure 6 As shown, when the pipeline vibrates and deflects at a large angle, the tooth 31 compresses the left and right rubber seals 32 and the spring 33 at the same time, the tooth 31 on the upper shell moves to the left, and the piston 23 moves downward, so that the cavity 21 is close to the pipeline. The tooth 31 on the lower shell moves to the right, and the piston 23 moves downward, so that the cavity 21 recovers its elasticity, giving the pipeline space, so that the pipeline can still maintain sealing at the deflection angle, and has a certain earthquake resistance.

[0055] The foregoing examples are merely illustrative and serve to illustrate some of the features of the method of the present invention. The appended claims are intended to claim the widest possible scope that can be envisioned, and the embodiments presented herein are merely illustrative of selected implementations according to a combination of all possible embodiments. Therefore, it is the applicant's intention that the appended claims are not limited by the selection of examples illustrating the features of the present invention. Some numerical ranges used in the claims also include subranges therein, and variations in these ranges should also be interpreted as being covered by the appended claims where possible.

Claims

1. A pipe connection joint that prevents thermal expansion and contraction, characterized in that: include: The shell has a semicircular structure and is provided with connecting parts on both sides, and the connecting parts have threaded holes; A sealing ring is inside the housing, and a cavity is formed inside the sealing ring. The cavity is connected to an oil filling pipe, and a piston is formed inside the oil filling pipe. A piston rod is connected above the piston. The clamp has a semicircular structure and is located inside the housing. The clamp has teeth that are slidably connected to the clamp. A connecting rod mechanism connected to the piston rod in the clamp and the sealing ring; A support frame, the support frame is outside the shell, and the connecting rod mechanism is on the support frame; The connecting rod mechanism includes a vertical rod, a horizontal rod and a slider, one end of the vertical rod is connected to the latch, and the other end is connected to the horizontal rod, the horizontal rod is connected to the slider, and a limit rod is included in the slider, and the limit rod is connected to the piston rod; The sliding block is provided with an inclined limiting groove, and the limiting rod is in the limiting groove.

2. The pipe connection joint capable of preventing thermal expansion and contraction according to claim 1, characterized in that: The housing is provided with a sliding groove, the vertical rod is in the sliding groove, and a scale line is provided beside the sliding groove.

3. The pipe connection joint capable of preventing thermal expansion and contraction according to claim 1, characterized in that: The support frame includes a support ring, a support block and a column. The support ring surrounds the outside of the shell. Both ends of the support ring are arranged on the connecting part. The column connects the shell and the support ring. The support block is on the support ring.

4. The pipe connection joint capable of preventing thermal expansion and contraction according to claim 3, characterized in that: A slideway is provided in the support block, the extension direction of the slideway is the same as the direction of the joint axis, and the crossbar is arranged in the slideway.

5. The pipe connection joint capable of preventing thermal expansion and contraction according to claim 1, characterized in that: Rubber corrugated pads are arranged on both sides of the clamping teeth in the clamp, and a spring is arranged at the bottom of the clamping teeth.

6. The pipe connection joint capable of preventing thermal expansion and contraction according to claim 1, characterized in that: A positioning column is provided inside the shell, a positioning hole is provided outside the sealing ring, and the positioning column cooperates with the positioning hole.

7. The pipe connection joint capable of preventing thermal expansion and contraction according to claim 1, characterized in that: There are two shells, which are symmetrically arranged and fastened together using bolts passing through threaded holes.

8. The pipe connection joint capable of preventing thermal expansion and contraction according to claim 7, characterized in that: The sealing ring is a double V-shaped sealing ring, with a limiting protrusion in the middle of the sealing ring. Two cavities are symmetrically arranged in the limiting protrusion, and the cavities are filled with hydraulic oil.

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