Loose joint nut leading-in device for corrugated pipe

Abstract

A loose joint nut leading-in device used on a corrugated pipe comprises a pipe body, and symmetrical connectors are arranged at the left end and the right end of the pipe body. An annular outer limiting part is arranged on the outer wall of one end, far away from the pipe body, of the joint; loose joint nuts coaxial with the connectors are arranged on the left side and the right side of the pipe body, and the ends, away from the pipe body, of the connectors penetrate into the loose joint nuts in the direction away from the pipe body. The inner edge of a port of one end, close to the pipe body, of the loose joint nut extends inwards to form an annular inner limiting part, and the inner limiting part is located between the outer limiting part and the end of the pipe body. The inner diameter of the inner limiting part is larger than the outer diameter of the outer limiting part. According to the loose joint nut leading-in device for the corrugated pipe, the installation efficiency of the loose joint nut can be effectively improved, the situation that workers are injured in the installation process can be effectively avoided, potential safety hazards are effectively eradicated, and meanwhile the installation efficiency of the loose joint nut is improved. The loose joint nut can be disassembled under the condition that the stainless steel corrugated pipe is not damaged.

Description

Technical Field

[0001] The utility model relates to the field of bellows, in particular to a movable nut introduction device used for bellows. Background Art

[0002] Bellows is a common pipe fitting with a wide range of applications. For example, stainless steel bellows. In order to facilitate the connection between the bellows and other pipelines or connection ends, union nuts are set at both ends of the stainless steel bellows. In order to prevent the union nuts from falling off, a stainless steel bellows flattening machine is used to flatten the ends of the stainless steel bellows to form an annular rib. The rib is used to prevent the union nut from falling off from the ends of the stainless steel bellows. This processing method involves the loading and unloading of the bellows on the stainless steel bellows flattening machine. There are many operating procedures, which ultimately limit the installation efficiency of the union nut. The pressure of the stainless steel bellows flattening machine on the ends of the stainless steel bellows comes from the cylinder. Since traditional stainless steel bellows flattening machines are manually loaded, if the stainless steel bellows flattening machine is accidentally opened during the loading process, it is very easy for the staff to be injured by the pressure of the cylinder, which poses certain safety hazards.

[0003] Although the connection method of installing the union nut on the stainless steel bellows by a stainless steel bellows smoothing machine can keep the union nut free to rotate while restricting the union nut on the bellows, once the union nut is connected, it can no longer be removed from the stainless steel bellows. If the union nut is damaged and needs to be replaced, the end of the bellows can only be cut off and then smoothed after replacing the new union nut. This makes the entire disassembly and assembly process extremely troublesome, seriously affecting the disassembly and assembly efficiency, and each replacement will make the stainless steel bellows shorter, which is not conducive to the long-term use of the stainless steel bellows. Summary of the invention

[0004] The utility model aims to solve the existing technical problem by providing a union nut introduction device for a bellows, which can not only effectively improve the installation efficiency of the union nut, but also effectively avoid injuries to workers during the installation process, effectively eliminating safety hazards, and at the same time, can complete the disassembly of the union nut without damaging the stainless steel bellows itself.

[0005] The technical solution adopted by the utility model to solve the above technical problems is:

[0006] The utility model discloses a union nut introduction device for a corrugated pipe, comprising a pipe body, wherein the left and right ends of the pipe body are provided with mutually symmetrical joints; an outer ring-shaped outer limiting portion is provided on the outer wall of one end of the joint away from the pipe body; union nuts coaxial with the joint are provided on the left and right sides of the pipe body, and one end of the joint away from the pipe body is inserted into the union nut in a direction away from the pipe body; an inner ring-shaped inner limiting portion is extended inwardly from the inner edge of one end of the union nut adjacent to the pipe body, and the inner limiting portion is located between the outer limiting portion and the end of the pipe body; the inner diameter of the inner limiting portion is larger than the outer diameter of the outer limiting portion diameter; a retaining ring is arranged on the outer sleeve of the joint, and the retaining ring is located between the outer limiting part and the inner limiting part; the inner edge of the retaining ring is opposite to the outer limiting part, and the outer edge of the retaining ring is opposite to the inner limiting part; a deformation gap is provided between the outer peripheral surface of the retaining ring and the inner wall of one end of the union nut adjacent to the pipe body; an introduction piece is provided at the end of the joint away from the pipe body to fit therewith; the diameter of the introduction piece gradually decreases toward the direction of the pipe body; a positioning head embedded in the joint is provided at the center of the end face of one end of the introduction piece adjacent to the pipe body; the inner diameter of the inner limiting part and the inner diameter of the retaining ring are both larger than the diameter of one end of the introduction piece away from the pipe body.

[0007] An annular expansion groove is provided on the inner wall of one end of the union nut adjacent to the tube body; the deformation gap is located between the expansion groove and the inner limit portion; the expansion groove is transitionally connected to the deformation gap through a guide cone surface; the diameter of the guide cone surface gradually increases in the direction away from the tube body.

[0008] An annular connecting groove is arranged on the outer wall of one end of the joint adjacent to the center of the pipe body; the end of the pipe body is sleeved outside the joint and deformed and embedded into the connecting groove under the action of external force.

[0009] A sealing cone surface is arranged on the right groove wall of the connecting groove, and the diameter of the sealing cone surface gradually increases toward the pipe body.

[0010] The diameter of one end of the introduction piece adjacent to the tube body is larger than the diameter of the outer limiting portion.

[0011] The beneficial effects of the utility model are:

[0012] Compared with the prior art, the union nut introduction device for the bellows using the structure of the utility model can quickly introduce the union nut to the outside of the joint through the introduction piece, and finally use the retaining spring to limit the union nut outside the joint, and enable the union nut to rotate freely, so as to facilitate the connection between the bellows and other pipelines or connection ends through the union nut. After the introduction piece completes the introduction of the union nut, the staff can directly hold the end of the introduction piece with a smaller diameter to pull the introduction piece out of the union nut. The entire installation process does not involve loading and unloading work, and there is no need to use a cylinder to press a ring-shaped rib on the end of the bellows. The installation of the union nut can be completed by pressing the union nut toward the direction of the joint. The entire installation process is extremely simple, which can effectively ensure the installation efficiency of the union nut, and can effectively avoid injuries to staff during the installation of the union nut, effectively eliminating safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a cross-sectional view of the utility model of the movable nut introduction device used on the bellows;

[0014] Figure 2 It is a partial cross-sectional view of the movable nut introduction device for a bellows according to the utility model;

[0015] Figure 3 A three-dimensional diagram of a movable nut introduction device for a bellows according to the utility model;

[0016] Figure 4 This is a cross-sectional view of the union nut when it is moved toward the joint for assembly. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0018] See also Figures 1 to 4The utility model provides a union nut introduction device for a corrugated pipe, comprising a pipe body 1, wherein the left and right ends of the pipe body 1 are provided with mutually symmetrical joints 2; an outer wall of the end of the joint 2 away from the pipe body 1 is provided with an annular outer limiting portion 3; union nuts 4 coaxial with the joint 2 are provided on the left and right sides of the pipe body 1, and the end of the joint 2 away from the pipe body 1 is inserted into the union nut 4 in a direction away from the pipe body 1; an inner edge of an end of the union nut 4 adjacent to the pipe body 1 extends inwardly to form an annular inner limiting portion 5, and the inner limiting portion 5 is located between the outer limiting portion 3 and the end of the pipe body 1; the inner diameter of the inner limiting portion 5 is greater than the outer diameter of the outer limiting portion 3; The joint 2 is covered with a retaining spring 6, which is located between the outer limit part 3 and the inner limit part 5; the inner edge of the retaining spring 6 is opposite to the outer limit part 3, and the outer edge of the retaining spring 6 is opposite to the inner limit part 5; a deformation gap 7 is provided between the outer peripheral surface of the retaining spring 6 and the inner wall of the end of the union nut 4 adjacent to the pipe body 1; an introduction piece 8 fitting therewith is provided at the end of the joint 2 away from the pipe body 1; the diameter of the introduction piece 8 gradually decreases toward the direction of the pipe body 1; a positioning head 9 embedded in the joint 2 is provided at the center of the end face of the introduction piece 8 adjacent to the pipe body 1; the inner diameter of the inner limit part 5 and the inner diameter of the retaining spring 6 are both larger than the diameter of the end of the introduction piece 8 away from the pipe body 1.

[0019] An annular expansion groove 10 is provided on the inner wall of one end of the union nut 4 adjacent to the tube body 1; the deformation gap 7 is located between the expansion groove 10 and the inner limit portion 5; the expansion groove 10 is transitionally connected to the deformation gap 7 through a guide cone surface 11; the diameter of the guide cone surface 11 gradually increases in the direction away from the tube body 1.

[0020] An annular connecting groove 12 is provided on the outer wall of one end of the joint 2 adjacent to the center of the pipe body 1 ; the end of the pipe body 1 is sleeved outside the joint 2 and deformed and embedded into the connecting groove 12 under the action of external force.

[0021] The right groove wall of the connecting groove 12 is provided with a sealing cone surface 13 , and the diameter of the sealing cone surface 13 gradually increases toward the pipe body 1 .

[0022] The diameter of one end of the introducing member 8 adjacent to the tube body 1 is larger than the diameter of the outer limiting portion 3 .

[0023] The method of using the utility model is as follows:

[0024] When the union nut is not assembled, only the joint 2 is connected to the pipe body 1, and the union nut 4 and the introduction piece 8 are both independent. At this time, the retaining spring 6 can narrow its outer diameter when its two ends are close to each other, so as to facilitate the retaining spring 6 to be quickly installed into the union nut 4, and finally be stuck in a position that fits with the inner limit part 5 of the union nut 4. After the retaining spring 6 is installed into the union nut 4, the union nut 4 can be installed on the joint 2. Before installation, the positioning head 9 at the end of the introduction piece 8 can be embedded in the joint 2 to achieve the positioning of the introduction piece 8. At this time, the end of the union nut 4 with the inner limit part 5 can be opposite to the end with the smaller diameter of the introduction piece 8, and then the installation of the union nut 4 can be started. When the joint and the introduction piece 8 are both kept stationary, the union nut 4 is continuously approached to the joint, and the diameter of the introduction piece 8 gradually decreases toward the direction of the pipe body 1, and the inner diameter of the inner limit part 5 and the inner diameter of the retaining spring 6 are both smaller than the introduction piece. The diameter of one end away from the tube body 1, so the end of the introduction piece 8 with a smaller diameter can easily pass through the inner hole of the inner limit part 5 and the retaining spring 6 in sequence. As the union nut 4 continues to approach the joint 2, the diameter of the part where the introduction piece 8 passes through the retaining spring 6 continues to increase. Finally, the introduction piece 8 uses its own continuously increasing diameter to squeeze the inner wall of the retaining spring 6 outward, thereby making the inner diameter of the retaining spring 6 continue to increase. Finally, the inner diameter of the retaining spring 6 is larger than the diameter of the outer limit part 3, so that the retaining spring 6 can pass through the outer limit part 3 smoothly and finally be sleeved on the outside of the joint 2. As the retaining spring 6 passes through the outer limit part 3, the compression of the outer wall of the introduction piece 8 is lost, and the retaining spring 6 will return to its original state under the action of its own elasticity. At this time, the inner diameter of the retaining spring 6 is smaller than the outer diameter of the outer limit part 3, and the outer diameter of the retaining spring 6 is larger than the inner diameter of the inner limit part 5. The existence of the retaining spring 6 makes it impossible for the inner limit part to pass through the outer limit part 3 smoothly, effectively restricting the union nut 4 outside the joint, and completing the installation of the union nut 4.

[0025] The circumference of the nut 4 is smaller than that of the nut 4, and the circumference of the nut 4 is smaller than that of the nut 4. The ...

[0026] An annular expansion groove 10 is provided on the inner wall of one end of the union nut 4 adjacent to the pipe body 1, and the deformation gap 7 is located between the expansion groove 10 and the inner limit portion 5. The expansion groove 10 is transitionally connected to the deformation gap 7 through a guide cone 11, and the diameter of the guide cone 11 gradually increases in the direction away from the pipe body 1. Since the existing clamping spring 6 is C-shaped and has holes at both ends, when the union nut 4 needs to be removed from the joint 2, pressure can be applied to the holes at both ends of the clamping spring 6 through the gap between the inner wall of the inner limit portion 5 and the outer wall of the joint 2, so that the two ends of the clamping spring 6 are opened, the outer diameter of the clamping spring 6 is artificially expanded, and then the clamping spring 6 is simultaneously removed. The spring 6 pushes toward the expansion groove 10. The existence of the expansion groove 10 can effectively increase the actual gap between the inner wall of the union nut 4 and the outer wall of the outer limit part 3, which is more conducive to the spring 6 being sleeved on the outside of the outer limit part 3. As the spring 6 slides into the expansion groove 10 through the guide cone 11, the inner limit part 5 is no longer restricted by the spring 6, and the outer limit part 3 can smoothly pass through the inner hole of the inner limit part 5, thereby realizing the disassembly of the union nut 4. The entire disassembly process will not damage any components, so that the tube body 1 of the bellows can maintain its original state, which is conducive to the continued use of the bellows after replacing the new union nut 4, effectively extending the service life of the bellows.

[0027] The diameter of one end of the introduction piece 8 adjacent to the tube body 1 is larger than the diameter of the outer limit portion 3, so that when the retaining spring 6 passes through the outer limit portion 3, the inner diameter of the retaining spring 6 is larger than the outer diameter of the outer limit portion 3, which facilitates the retaining spring 6 to quickly pass through the outer limit portion 3 and avoids jamming during the introduction process of the union nut 4.

[0028] An annular connecting groove 12 is provided on the outer wall of one end of the connector 2 adjacent to the center of the tube body 1. The end of the tube body 1 is sleeved outside the connector 2 and deformed and embedded into the connecting groove 12 under the action of external force. This fixing method can not only realize the quick connection between the end of the tube body 1 and the connector 2, but also ensure the stability of both.

[0029] A sealing cone 13 is provided on the right side groove wall of the connecting groove 12, and the diameter of the sealing cone 13 gradually increases toward the pipe body 1. The existence of the sealing cone 13 can not only effectively increase the sealing area between the inner wall of the bellows and the joint, and effectively improve the sealing performance, but also the existence of the sealing cone 13 can make the end of the pipe body 1 deform and hug the connecting groove 12 to obtain a certain slope, thereby avoiding the situation where the deformation angle is too straight and causes the end of the bellows to rupture.

Claims

1. A union nut introduction device for a corrugated pipe, comprising a pipe body, Features: The left and right ends of the tube body are provided with symmetrical joints; the outer wall of the end of the joint away from the tube body is provided with an annular outer limit part; the left and right sides of the tube body are provided with union nuts coaxial with the joint, and the end of the joint away from the tube body is inserted into the union nut in the direction away from the tube body; an inner edge of the end of the union nut adjacent to the tube body extends inwardly to an annular inner limit part, and the inner limit part is located between the outer limit part and the end of the tube body; the inner diameter of the inner limit part is larger than the outer diameter of the outer limit part; the outer sleeve of the joint is provided with a retaining spring, and the retaining spring Located between the outer limit part and the inner limit part; the inner edge of the retaining spring is opposite to the outer limit part, and the outer edge of the retaining spring is opposite to the inner limit part; there is a deformation gap between the outer peripheral surface of the retaining spring and the inner wall of one end of the union nut adjacent to the pipe body; an introduction piece fitting therewith is provided at the end of the joint away from the pipe body; the diameter of the introduction piece gradually decreases toward the direction of the pipe body; a positioning head embedded in the joint is provided at the center of the end face of one end of the introduction piece adjacent to the pipe body; the inner diameter of the inner limit part and the inner diameter of the retaining spring are both larger than the diameter of the end of the introduction piece away from the pipe body.

2. A union nut introduction device for a bellows according to claim 1, Features: An annular expansion groove is provided on the inner wall of one end of the union nut adjacent to the tube body; the deformation gap is located between the expansion groove and the inner limit portion; the expansion groove is transitionally connected to the deformation gap through a guide cone surface; the diameter of the guide cone surface gradually increases in the direction away from the tube body.

3. A union nut introduction device for a bellows according to claim 1, Features: An annular connecting groove is arranged on the outer wall of one end of the joint adjacent to the center of the pipe body; the end of the pipe body is sleeved outside the joint and deformed and embedded into the connecting groove under the action of external force.

4. A union nut introduction device for a bellows according to claim 3, Features: The right groove wall of the connecting groove is provided with a sealing cone surface, and the diameter of the sealing cone surface gradually increases toward the pipe body.

5. A union nut introduction device for a bellows according to claim 1, Features: The diameter of one end of the introduction piece adjacent to the tube body is larger than the diameter of the outer limiting portion.

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