A telescopic and anti-bending corrugated pipe structure

Abstract

The present invention discloses a telescopic and anti-bending bellows structure, which includes a bellows combined pipeline and a combined guiding cylinder, and the bellows combined pipeline is sleeved inside the combined guiding cylinder; the bellows combined pipeline includes bellows, an inner sleeve and a flange. There are multiple bellows in the bellows combined pipeline, and the nominal diameters of the multiple bellows gradually decrease from top to bottom. The axial elastic coefficients of the bellows are different, and it is satisfied that the product of the axial elastic coefficient of each bellows and its maximum telescopic amount should be equal. An inner sleeve is sleeved inside the bellows at the lowermost end, and the inner sleeve penetrates into the bellows at the lowermost end from the bottom and penetrates out of the bellows at the lowermost end from the top. The present invention adopts a guiding cylinder and an inner sleeve structure, which restricts the bending of the bellows during use, and at the same time the vibration amplitude is also effectively controlled. The present invention makes full use of the characteristic that the axial elastic coefficient of the slender bellows is relatively large, and the whole can be axially telescoped, which is particularly suitable for between two joints with relative movement.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline connection, and specifically to a telescopic and anti-bending corrugated pipe structure. Background Art

[0002] At present, corrugated pipes are commonly used in the vacuum pipelines of crystal growth furnaces. The corrugated pipes in the prior art are mainly cylindrical corrugated pipes with both ends open. Due to the low stiffness of traditional small-diameter corrugated pipes (especially slender corrugated pipes), the axial elastic coefficient is relatively large, and they are prone to bending and vibration during use. When used between two joints with relative movement, the bending and vibration are even greater. The bending and vibration of the corrugated pipe cause large changes in the pressure drop in the vacuum pipeline, which has a certain impact on the crystal growth yield. Especially when used between moving parts, the degree and position of bending change greatly and uncontrollably, which has a greater impact on the pipeline pressure drop.

[0003] If the stiffness of the corrugated pipe is too large, the deformation amount cannot meet the requirements needed in practice. Therefore, there is an urgent need for a metal corrugated pipe that can achieve a large telescopic range. Summary of the Invention

[0004] Aiming at the above existing technical deficiencies, the purpose of the present invention is to provide a telescopic and anti-bending corrugated pipe structure to solve the problems raised in the background art.

[0005] To solve the above technical problems, the present invention adopts the following technical solutions:

[0006] The present invention provides a telescopic and anti-bending corrugated pipe structure, which includes a corrugated pipe combined pipeline and a combined guiding cylinder, and the corrugated pipe combined pipeline is sleeved inside the combined guiding cylinder;

[0007] The corrugated pipe combined pipeline includes corrugated pipes and an inner sleeve. There are multiple corrugated pipes in the corrugated pipe combined pipeline, and the nominal diameters of the multiple corrugated pipes gradually decrease from top to bottom; the axial elastic coefficients of the corrugated pipes are different, and it is satisfied that the product of the axial elastic coefficient of each corrugated pipe and its maximum telescopic amount should be equal, that is:

[0008] k1×L1 = k2×L2 = k3×L3 = k4×L4 = …… = kn×Ln;

[0009] In the formula: k1, k2, k3, k4 …… kn are the axial elastic coefficients of corrugated pipe one, corrugated pipe two, corrugated pipe three, corrugated pipe four …… corrugated pipe n respectively, and L1, L2, L3, L4 …… Ln are the maximum designed telescopic amounts of corrugated pipe one, corrugated pipe two, corrugated pipe three, corrugated pipe four …… corrugated pipe n respectively; the maximum designed telescopic amounts L1, L2, L3, L4 …… Ln are all within the elastic deformation range of the corresponding corrugated pipes and a set margin is left.

[0010] An inner sleeve is sleeved inside the bellows at the lowermost end. The inner sleeve penetrates into the bellows at the lowermost end from the bottom and penetrates out of the bellows at the lowermost end from the top.

[0011] The number of guide cylinders of the combined guide cylinder is one less than the number of bellows, and the aperture of the combined guide cylinder gradually decreases from top to bottom.

[0012] Preferably, the number of bellows is four, namely bellows one, bellows two, bellows three, and bellows four with gradually decreasing nominal diameters from top to bottom. Adjacent bellows are connected by flanges.

[0013] The combined guide cylinder includes a first-stage guide cylinder, a second-stage guide cylinder, and a third-stage guide cylinder with gradually decreasing apertures from top to bottom. The first-stage guide cylinder, the second-stage guide cylinder, and the third-stage guide cylinder have the same structure. The first-stage guide cylinder is in the shape of a thin-walled hollow circular tube. An installation flange is welded to the upper end of the first-stage guide cylinder. The first-stage guide cylinder is connected to the flange at the upper end of the bellows one by bolts through the installation flange. A retaining ring is integrally connected to the inner circumference of the bottom of the first-stage guide cylinder.

[0014] Preferably, the bellows one is sleeved inside the first-stage guide cylinder, the bellows two is sleeved inside the second-stage guide cylinder, the bellows three and the bellows four are sleeved inside the third-stage guide cylinder. The second-stage guide cylinder is connected to the flange at the upper end of the bellows two by bolts through the installation flange. The outer diameter of the second-stage guide cylinder is smaller than the inner diameter of the retaining ring at the bottom of the first-stage guide cylinder. The flange at the top of the second-stage guide cylinder is located inside the first-stage guide cylinder. In this way, when the bellows expands and contracts, the top of the second-stage guide cylinder is limited to move back and forth inside the first-stage guide cylinder. The flange at the top of the bellows three is located inside the second-stage guide cylinder. The flange at the top of the bellows three and the flange at the top of the third-stage guide cylinder are connected together by bolts. The outer diameter of the flange at the connection of the bellows three and the bellows four is smaller than the inner diameter of the third-stage guide cylinder and larger than the inner diameter of the retaining ring at the bottom of the third-stage guide cylinder. In this way, the bellows three moves back and forth inside the third-stage guide cylinder, and the bellows four can extend out of the third-stage guide cylinder.

[0015] Preferably, when the bellows combination pipeline is fully expanded, the lower surface of the flange at the top of the second-stage guide cylinder fits with the upper surface of the retaining ring at the bottom of the first-stage guide cylinder, and the bellows one reaches the maximum design expansion and contraction amount L1; the lower surface of the flange at the top of the third-stage guide cylinder fits with the upper surface of the retaining ring at the bottom of the second-stage guide cylinder, and the bellows two reaches the maximum design expansion and contraction amount L2; the lower end surface of the flange at the lower end of the bellows three fits with the upper surface of the retaining ring at the bottom of the third-stage guide cylinder, and the bellows three reaches the maximum design expansion and contraction amount L3; the upper end surface of the flange at the lower end of the bellows three fits with the lower end surface of the retaining block at the end of the inner sleeve, and the bellows four reaches the maximum design expansion and contraction amount L4.

[0016] Preferably, the flanges at both ends of the bellows combined pipeline are pipeline connection flanges.

[0017] Preferably, the inner hole of the flange between the second bellows and the third bellows has a conical structure that is wider at the top and narrower at the bottom. When the block at the top of the inner sleeve moves through the conical structure of the inner hole of the flange, the conical structure of the inner hole of the flange plays a guiding role to prevent the block at the top from getting stuck on the flange when the inner sleeve moves.

[0018] Preferably, the inner diameter specifications of adjacent bellows are arranged according to adjacent or spaced-apart specifications. In this way, the first bellows, the second bellows, the third bellows, and the fourth bellows are arranged close to a straight line state, with the lowest pressure drop.

[0019] Preferably, the outer diameter of the first bellows is not greater than 80 mm.

[0020] Preferably, the inner sleeve is in the shape of a thin-walled circular tube. The bottom of the fourth bellows is fixed to the lower part of the inner sleeve. The bottom end of the inner sleeve is fixed with a flange. A block is fixed along the circumference on the outer side of the top of the inner sleeve.

[0021] In the present invention, the connection between the bellows combined pipeline and each stage of the guide cylinder is a bolt connection, or it can also be made into an integral body by welding.

[0022] The beneficial effects of the present invention are as follows:

[0023] (1) The present invention adopts the guide cylinder and inner sleeve structures, which limit the bending of the bellows during use, and at the same time effectively controls the vibration amplitude. The present invention makes full use of the characteristic that the axial elastic coefficient of the slender bellows is relatively large, and the whole can axially expand and contract, and is particularly suitable for the connection between two joints with relative movement.

[0024] (2) The present invention adopts a layout in which multiple specifications of bellows are arranged in sequence according to the nominal diameter size. When a pressure gauge or a vacuum gauge is installed on the flange at the end of the bellows with the smallest nominal diameter, compared with a whole bellows with the smallest nominal diameter, the former has a smaller pressure difference, the measured value of the instrument is more accurate, and the allowable installation distance of the measuring instrument from the measuring point is farther. The bellows structure of the present invention solves the problems of bending and vibration caused by the low stiffness of the bellows (especially the slender bellows), and is particularly suitable for the pipeline connection between two joints with relative movement in the vacuum system of the crystal growth furnace. The bending and vibration of the slender bellows cause the pressure difference in the pipeline inside the bellows to change uncontrollably, which not only affects the accuracy of the pipeline vacuum degree measurement value, but also affects the yield of the crystal rod.

[0025] (3) The present invention adopts a self-guided corrugated pipe design, which can well solve the problems of traditional corrugated pipes. That is, if the rigidity of the traditional corrugated pipe is too small, the lateral rigidity is insufficient and it is easy to bend. If the rigidity is too large, the deformation amount cannot meet the requirements needed in practice, which is the originality of the present invention. In the case where the corrugated pipe has no lateral deformation, it can not only meet the requirements of a large radial deformation amount, but also well solve the problem of insufficient lateral rigidity. The lateral rigidity of the present invention is realized through an external combined guide cylinder. Although the rigidity of the corrugated pipe itself is very small, due to the existence of the external combined guide cylinder, no lateral deformation will occur, meeting the design requirements.

[0026] (4) The corrugated pipe of the present invention is applied to the vacuum pipeline system of a crystal growth furnace, especially between two joints with movement. Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0028] Figure 1 It is a side view of the present invention;

[0029] Figure 2 It is a cross-sectional view of the present invention;

[0030] Figure 3 It is a cross-sectional view of the corrugated pipe in the present invention;

[0031] Figure 4 It is a partial enlarged view of part A in the present invention;

[0032] Figure 5 It is a partial enlarged view of part B in the present invention;

[0033] Figure 6 It is a partial enlarged view of part C in the present invention;

[0034] Figure 7 It is a schematic diagram of the corrugated pipe of the present invention in the maximum extended state;

[0035] Figure 8 It is a structural schematic diagram of the primary guide cylinder in the present invention.

[0036] Description of the reference numerals:

[0037] 1 - Bellows combined pipeline, 2 - Primary guiding cylinder, 3 - Secondary guiding cylinder, 4 - Tertiary guiding cylinder, 5 - Connecting bolt, 6 - Retaining ring, 11 - First bellows, 12 - Second bellows, 13 - Third bellows, 14 - Fourth bellows, 15 - Inner sleeve, 16 - Flange, 17 - Installation flange. Detailed implementation mode

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0039] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0040] Embodiment:

[0041] As Figure 1-8 shown, the present invention provides a telescopic and bend-resistant bellows structure applicable to bellows with an outer diameter not greater than 80 mm. The present invention includes a bellows combined pipeline 1, a combined guiding cylinder, and a connecting bolt 5. The bellows combined pipeline 1 is sleeved in the combined guiding cylinder through a flange 16 and a bolt 5.

[0042] The bellows combined pipeline 1 includes bellows, an inner sleeve 15, and a flange 16. As shown in the attached Figure 2 and attached Figure 3 drawings, the bellows of the bellows combined pipeline 1 are multiple, and can be 2 - 10. Preferably, in this embodiment, the number of bellows is four, namely the first bellows 11, the second bellows 12, the third bellows 13, and the fourth bellows 14 with gradually decreasing nominal diameters from top to bottom. Adjacent bellows are connected through a flange 16, and the axial elastic coefficients of the first bellows 11, the second bellows 12, the third bellows 13, and the fourth bellows 14 are different. In order to make each specification of bellows reach its maximum design telescopic amount when the telescopic amount of the bellows combined pipeline 1 reaches the maximum, the product of the elastic coefficient of each bellows and its maximum telescopic amount should be equal, that is:

[0043] k1 × L1 = k2 × L2 = k3 × L3 = k4 × L4.

[0044] Where: k1 is the axial elastic coefficient of the first bellows 11, and L1 is the maximum designed expansion / contraction amount of the first bellows 11; k2 is the axial elastic coefficient of the second bellows 12, and L2 is the maximum designed expansion / contraction amount of the second bellows 12; k3 is the axial elastic coefficient of the third bellows 13, and L3 is the maximum designed expansion / contraction amount of the third bellows 13; k4 is the axial elastic coefficient of the fourth bellows 14, and L4 is the maximum designed expansion / contraction amount of the fourth bellows 14. The maximum designed expansion / contraction amounts L1, L2, L3, and L4 are all within the elastic deformation range of the corresponding bellows and a set margin is left to prevent the bellows from being unable to recover or being damaged. The user selects an appropriate margin according to actual needs, and the margin is set to 10 - 30% of the maximum elastic deformation amount of the bellows. For example, the elastic deformation range of the first bellows 11 is 0 - 100 cm, L1 is taken as 80 cm, and the margin is 20 cm.

[0045] Appendix Figure 3 Among them, an inner sleeve 15 is sleeved inside the fourth bellows 14. The inner sleeve 15 is in the shape of a thin-walled circular tube, and the outer diameter of the inner sleeve 15 is equal to the inner diameter of the fourth bellows 14, so that the inner sleeve 15 just fits inside the fourth bellows 14 to prevent the fourth bellows 14 from bending. The implementation scheme of the inner sleeve 15 and the fourth bellows 14 can be seen in the enlarged view Figure 4 , the inner sleeve 15 penetrates into the fourth bellows 14 from the bottom, and the inner sleeve 15 penetrates out of the fourth bellows 14 from the top. When the bellows is stretched to the longest state, as shown in Appendix Figure 2 shown, the top end of the inner sleeve 15 extends into the second bellows 12, the inner sleeve 15 moves a distance of L4, the bottom of the fourth bellows 14 is welded to the lower part of the inner sleeve 15, and the bottom end of the inner sleeve 15 is welded with a flange 16. When the fourth bellows 14 expands and contracts, the inner sleeve 15 also moves together. As shown in Figure 6 shown, a stop block 17 is welded along the circumference on the outer side of the top of the inner sleeve 15, and the stop block 17 is used to control the maximum designed expansion / contraction amount L4 of the fourth bellows 14.

[0046] Furthermore, as shown in the enlarged view Figure 5 shown, the inner hole of the flange 16 between the second bellows 12 and the third bellows 13 is in a conical structure with a wider top and a narrower bottom. When the stop block 14 at the top of the inner sleeve 15 moves through the conical structure of the inner hole of the flange 16, the conical structure of the inner hole of the flange 16 plays a guiding role to prevent the stop block 14 at the top of the inner sleeve 15 from getting stuck on the flange 16 when the inner sleeve 15 moves.

[0047] Furthermore, the inner diameter specifications of the first bellows 11, the second bellows 12, the third bellows 13, and the fourth bellows 14 are arranged according to adjacent or every other specification inner diameter. In this way, the first bellows 11, the second bellows 12, the third bellows 13, and the fourth bellows 14 are arranged close to a straight line state, and the pressure drop is the lowest.

[0048] Appendix Figure 4It is a structural diagram of a guide cylinder. The number of guide cylinders in the combined guide cylinder is one less than the number of bellows. In this embodiment, the combined guide cylinder includes a first-stage guide cylinder 2, a second-stage guide cylinder 3, and a third-stage guide cylinder 4 with gradually decreasing apertures from top to bottom. The first-stage guide cylinder 2, the second-stage guide cylinder 3, and the third-stage guide cylinder 4 have the same structure, and the only difference lies in the aperture. Here, only the structure of the first-stage guide cylinder 2 is introduced. The first-stage guide cylinder 2 is in the shape of a thin-walled hollow circular tube. An installation flange 17 is welded to the upper end of the first-stage guide cylinder 2. The first-stage guide cylinder 2 is threadedly connected to the flange 16 at the upper end of the first bellows 11 of the bellows combination pipeline 1 through the installation flange 17 and bolts 5. A retaining ring 6 is integrally connected to the inner circumference of the bottom of the first-stage guide cylinder 2. The first-stage guide cylinder 2 is used to limit the bending of the first bellows 11 on the bellows combination pipeline 1 and also plays a guiding role when the first bellows 11 expands and contracts; the retaining ring 6 is used to limit the maximum elongation of the first bellows 11 and prevent damage caused by a large deformation amount of the first bellows 11.

[0049] The first bellows 11 is sleeved inside the first-stage guide cylinder 2, the second bellows 12 is sleeved inside the second-stage guide cylinder 3, and the third bellows 13 and the fourth bellows 14 are sleeved inside the third-stage guide cylinder 4. The second-stage guide cylinder 3 is threadedly connected to the flange 16 at the upper end of the second bellows 12 through the installation flange 17 and bolts 5. The outer diameter of the second-stage guide cylinder 3 is smaller than the inner diameter of the retaining ring 6 at the bottom of the first-stage guide cylinder 2. The flange 16 at the top of the second-stage guide cylinder 3 is located inside the first-stage guide cylinder 2. In this way, when the bellows expands and contracts, the top of the second-stage guide cylinder 3 is limited to move back and forth inside the first-stage guide cylinder 2, that is, when the first bellows 11 is in the maximum elongation state, it will not exceed the first-stage guide cylinder 2. The flange 16 at the top of the third bellows 13 is located inside the second-stage guide cylinder 3, and the flange 16 at the top of the third bellows 13 and the flange 16 at the top of the third-stage guide cylinder 4 are connected together by bolts. The outer diameter of the flange 16 at the connection of the third bellows 13 and the fourth bellows 14 is smaller than the inner diameter of the third-stage guide cylinder 4, and the outer diameter of the flange 16 at the bottom of the fourth bellows 14 is larger than the inner diameter of the retaining ring 6 at the bottom of the third-stage guide cylinder 4. In this way, the third bellows 13 moves back and forth inside the third-stage guide cylinder 4, and the fourth bellows 14 can extend out of the third-stage guide cylinder 4.

[0050] The flange 16 at the top of the second-stage guide cylinder 3 is located inside the first-stage guide cylinder 2. In this way, when the bellows expands and contracts, the top of the second-stage guide cylinder 3 is limited to move back and forth inside the first-stage guide cylinder 2. Similarly, the flange 16 at the top of the third-stage guide cylinder 4 is only limited to move back and forth inside the second-stage guide cylinder 3. In this way, the fourth bellows 14 can partially move back and forth inside the third-stage guide cylinder 4.

[0051] Appendix Figure 7This is the fully extended state diagram of the corrugated pipe combined pipeline 1 of the present invention. At this time, the lower surface of the flange 16 at the top of the secondary guide cylinder 3 is in contact with the upper surface of the retaining ring 6 at the bottom of the primary guide cylinder 2, and the corrugated pipe 11 reaches the maximum designed expansion amount L1; the lower surface of the flange 16 at the top of the tertiary guide cylinder 4 is in contact with the upper surface of the retaining ring 6 at the bottom of the secondary guide cylinder 3, and the corrugated pipe 12 reaches the maximum designed expansion amount L2; the lower end surface of the flange 16 at the lower end of the corrugated pipe 13 is in contact with the upper surface of the retaining ring 6 at the bottom of the tertiary guide cylinder 4, and the corrugated pipe 13 reaches the maximum designed expansion amount L3; the upper end surface of the flange 16 at the lower end of the corrugated pipe 13 is in contact with the lower end surface of the stop block 17 at the end of the inner sleeve 15, and the corrugated pipe 14 reaches the maximum designed expansion amount L4.

[0052] In the present invention, the number of corrugated pipes is 4. In actual application, the number of corrugated pipes is not limited to 4 and can be more or less.

[0053] In the present invention, the connection between the corrugated pipe combined pipeline 1 and each level of guide cylinder is a bolt connection, and it can also be made into an integral body by welding.

[0054] The flanges 16 at both ends of the corrugated pipe combined pipeline 1 are pipeline connection flanges.

[0055] In this embodiment, the material of the corrugated pipe structure is a metal material, specifically it can be a carbon steel or stainless steel material.

[0056] Working principle:

[0057] The corrugated pipe structure of the present invention is used in a vacuum pipeline system, especially between two moving joints. For example, one end of the corrugated pipe of the present invention is connected to the lifting head in the crystal growth furnace through a flange, and the other end flange is connected to a component or a vacuum chamber at the other end of the lifting rope. The vacuum chamber can move up and down under the guidance of the lifting head through the corrugated pipe with a guiding function. The role of the corrugated pipe here is to provide a vacuum channel for the lower cavity component connected as a component that can stretch up and down. At the same time, due to the external guiding combined guide cylinder, the radial stiffness is increased. It has both a large deformation amount and will not produce radial deformation, affecting the service life of the corrugated pipe. The corrugated pipe 1, the corrugated pipe 2 and the corrugated pipe 3 are guided by the combined guide cylinder and the radial stiffness is increased. The corrugated pipe 4 at the lowermost end is guided and the radial stiffness is increased through the inner sleeve.

[0058] The present invention adopts a self-guided corrugated pipe design, which can well solve the problems of traditional corrugated pipes. That is, if the rigidity of traditional corrugated pipes is too small, the lateral stiffness is insufficient and it is easy to bend. If the rigidity is too large, the deformation amount cannot meet the requirements needed in practice, which is the originality of the present invention.

[0059] In the case where the bellows has no lateral deformation, it can not only meet the requirement of large radial deformation, but also solve the problem of insufficient lateral stiffness well. The lateral stiffness of the present invention is realized by an external combined guide cylinder. Although the stiffness of the bellows itself is very small, due to the existence of the external combined guide cylinder, lateral deformation will not occur, meeting the design requirements.

[0060] In the prior art, conical bellows have appeared. For example, the variable-diameter bellows disclosed in CN 106090453 B. The difference between the bellows structure of the present invention and the conical bellows lies in:

[0061] 1. The bellows of the present invention adopts a small-diameter segmented cylindrical surface bellows, which has good tensile performance, while the conical bellows has poor tensile performance.

[0062] 2. When both use the same small-diameter end size, due to the conical shape of the conical bellows, the larger the overall length of the bellows, the larger the large-end diameter of the conical bellows will be. When the cross-sectional diameter of the bellows is greater than 100 mm, as the diameter increases, the tensile performance of the conical bellows becomes worse and worse until it cannot be stretched.

[0063] 3. When the connecting flanges at both ends of both are the same, the length of the bellows of the present invention is not limited by the size of the connecting flanges at both ends. Due to the conical shape limitation of the conical bellows, the length is limited by the size of the connecting flanges at both ends. At the same time, the conical bellows needs to be custom-made by opening a mold, and the cost is much higher than that of the bellows of the present invention.

[0064] 5. The bellows of this patent adopts a combined pipeline and a combined guide cylinder structure is arranged on its outer side to limit the bending of the bellows and keep it in a straight state. The conical bellows is as easy to bend as an ordinary cylindrical surface bellows when in use.

[0065] 6. The bellows of the present invention adopts a segmented structure, and in terms of pipeline pressure drop, the effect is close to that of the conical bellows.

[0066] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. A telescopic and anti-bending corrugated pipe structure, characterized in that, It includes a corrugated pipe combined pipeline and a combined guide cylinder, and the corrugated pipe combined pipeline is sleeved inside the combined guide cylinder; The corrugated pipe combined pipeline includes corrugated pipes and an inner sleeve. There are multiple corrugated pipes in the corrugated pipe combined pipeline. The nominal diameters of the multiple corrugated pipes gradually decrease from top to bottom; the axial elastic coefficients of the corrugated pipes are different, and it satisfies that the product of the axial elastic coefficient of each corrugated pipe and its maximum expansion amount should be equal, that is: k1×L1 = k2×L2 = k3×L3 = k4×L4 = …… = kn×Ln; In the formula: k1, k2, k3, k4……kn are the axial elastic coefficients of corrugated pipe one, corrugated pipe two, corrugated pipe three, corrugated pipe four……corrugated pipe n respectively, and L1, L2, L3, L4……Ln are the maximum designed expansion amounts of corrugated pipe one, corrugated pipe two, corrugated pipe three, corrugated pipe four……corrugated pipe n respectively; the maximum designed expansion amounts L1, L2, L3, L4……Ln are all within the elastic deformation range of the corresponding corrugated pipes and leave a set margin; An inner sleeve is sleeved inside the corrugated pipe at the lowermost end. The inner sleeve penetrates into the bottom of the corrugated pipe at the lowermost end and penetrates out from the top of the corrugated pipe at the lowermost end. A stop block is fixed along the circumference on the outer side of the top of the inner sleeve; The number of guide cylinders in the combined guide cylinder is one less than the number of corrugated pipes, and the aperture of the combined guide cylinder gradually decreases from top to bottom.

2. A telescopic and anti-bending corrugated pipe structure according to claim 1, characterized in that, The number of the corrugated pipes is four, namely corrugated pipe one, corrugated pipe two, corrugated pipe three and corrugated pipe four with gradually decreasing nominal diameters from top to bottom. Adjacent corrugated pipes are connected by flanges; The combined guide cylinder includes a first-stage guide cylinder, a second-stage guide cylinder and a third-stage guide cylinder with gradually decreasing apertures from top to bottom. The first-stage guide cylinder, the second-stage guide cylinder and the third-stage guide cylinder have the same structure. The first-stage guide cylinder is in the shape of a thin-walled hollow circular tube. An installation flange is welded to the upper end of the first-stage guide cylinder. The first-stage guide cylinder is connected to the flange at the upper end of the corrugated pipe one by bolts through the installation flange. A retaining ring is integrally connected to the inner circumference of the bottom of the first-stage guide cylinder.

3. A telescopic and anti-bending corrugated pipe structure according to claim 2, characterized in that, The first-stage guide cylinder is sleeved with corrugated pipe one, the second-stage guide cylinder is sleeved with corrugated pipe two, the third-stage guide cylinder is sleeved with corrugated pipe three and corrugated pipe four. The second-stage guide cylinder is connected to the flange at the upper end of the corrugated pipe two by bolts through the installation flange. The outer diameter of the second-stage guide cylinder is smaller than the inner diameter of the retaining ring at the bottom of the first-stage guide cylinder. The flange at the top of the second-stage guide cylinder is located inside the first-stage guide cylinder. In this way, when the corrugated pipe expands and contracts, the top of the second-stage guide cylinder is limited to move back and forth inside the first-stage guide cylinder. The flange at the top of the corrugated pipe three is located inside the second-stage guide cylinder. The flange at the top of the corrugated pipe three and the flange at the top of the third-stage guide cylinder are connected together by bolts. The outer diameter of the flange at the connection of the corrugated pipe three and the corrugated pipe four is smaller than the inner diameter of the third-stage guide cylinder, and the outer diameter of the flange at the connection of the corrugated pipe three and the corrugated pipe four is larger than the inner diameter of the retaining ring at the bottom of the third-stage guide cylinder. In this way, the corrugated pipe three moves back and forth inside the third-stage guide cylinder, and the corrugated pipe four can extend out of the third-stage guide cylinder.

4. The telescopic anti-bending corrugated pipe structure according to claim 3, wherein, When the corrugated pipe combined pipeline is fully extended, the lower surface of the flange at the top of the secondary guide cylinder fits with the upper surface of the retaining ring at the bottom of the primary guide cylinder, and the first corrugated pipe reaches the maximum designed expansion / contraction amount L1; the lower surface of the flange at the top of the tertiary guide cylinder fits with the upper surface of the retaining ring at the bottom of the secondary guide cylinder, and the second corrugated pipe reaches the maximum designed expansion / contraction amount L2; the lower end face of the flange at the lower end of the third corrugated pipe fits with the upper surface of the retaining ring at the bottom of the tertiary guide cylinder, and the third corrugated pipe reaches the maximum designed expansion / contraction amount L3; the upper end face of the flange at the lower end of the third corrugated pipe fits with the lower end face of the stop block at the end of the inner sleeve, and the fourth corrugated pipe reaches the maximum designed expansion / contraction amount L4.

5. A telescopic and anti-bending corrugated pipe structure according to claim 2, characterized in that, The flanges at both ends of the corrugated pipe combined pipeline are pipeline connection flanges.

6. The telescopic and anti-bending corrugated pipe structure according to claim 2, characterized in that, The inner hole of the flange between the second corrugated pipe and the third corrugated pipe has a conical structure that is wider at the top and narrower at the bottom.

7. The telescopic anti-bending corrugated pipe structure according to claim 2, characterized in that, The inner diameter specifications of adjacent corrugated pipes are arranged according to adjacent or every other specification inner diameter.

8. A telescopic and anti-bending corrugated pipe structure according to any one of claims 2-7, characterized in that, The outer diameter of the first corrugated pipe is not greater than 80 mm.

9. A telescopic and anti-bending corrugated pipe structure according to claim 2, characterized in that, The inner sleeve is in the shape of a thin-walled circular tube. The bottom of the fourth corrugated pipe is fixed to the lower part of the inner sleeve, and the bottom end of the inner sleeve is fixed with a flange.

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