Rectification device with function of quickly replacing easily-corroded valve body

Abstract

The utility model discloses a rectification device with a function of quickly replacing an easy-to-corrode valve body, which relates to the technical field of chemical separation equipment and comprises a rectification tower body, a pipeline and a valve body, the pipeline and the valve body are connected with the rectification tower body, and two ends of the valve body are fixedly connected with connecting flanges with annular grooves. The end, close to the valve body, of the pipeline is fixedly connected with a butt joint flange with an annular protrusion, the outer wall of the pipeline is movably sleeved with a nut butt joint disc, and the inner wall of the pipeline is meshed with a rotary butt joint gear through teeth. And one end of the rotary butt joint gear is rotationally connected with a positioning ring plate. The nut butt joint disc is in meshing transmission with teeth of the rotary butt joint gear, the rotary grip is matched to drive the multiple sets of fastening bolts and the fastening nuts to be synchronously locked or disassembled, and the tedious mode that a traditional flange is operated one by one through bolts is thoroughly changed.

Description

Technical Field

[0001] This utility model relates to the field of chemical separation equipment technology, specifically to a distillation device with the function of quickly replacing easily corroded valve bodies. Background Technology

[0002] In the fields of petrochemicals, pharmaceutical synthesis, and fine chemicals, distillation units are core equipment for separating components of mixtures. Because the materials processed (such as organic acids, alkaline solutions, and halogenated hydrocarbons) are generally corrosive, valve components in the piping system, such as feed valves, discharge valves, and reflux valves, become vulnerable parts. In existing technologies, the valve body and pipeline are typically connected using traditional flanges, whose structure includes mating flanges, sealing gaskets, and multiple sets of fastening bolts (usually 4-8 bolts). However, this connection method has the following significant drawbacks:

[0003] Inefficient replacement: When replacing the valve body, the bolts need to be removed one by one. The replacement of a single valve takes 30-60 minutes. Moreover, the bolts are prone to corrosion and rust over time, which further increases the difficulty of disassembly, causing frequent production line shutdowns and seriously affecting production efficiency.

[0004] Insufficient sealing reliability: When manually aligning the flange bolt holes, alignment errors are easily generated (parallelism deviation can reach more than 0.5mm), resulting in uneven compression of the sealing gasket and a high risk of material leakage, especially under high pressure conditions where the probability of leakage increases significantly.

[0005] Poor ease of operation: In narrow spaces or high-altitude installation scenarios, it is difficult to operate each bolt individually, and the alignment of the nut and bolt requires manual visual adjustment, which is time-consuming and labor-intensive.

[0006] Limitations in corrosion resistance: Traditional flange materials (such as carbon steel) are prone to galvanic corrosion when in contact with corrosive media. Even when stainless steel is used, the material difference between the bolts and the flange may still cause localized corrosion, shortening the life of the components.

[0007] To address these issues, some quick-connect structures have emerged in the prior art, such as clamp-type quick-release couplings. However, these structures generally suffer from insufficient positioning accuracy and uneven stress on the sealing surface, making it difficult to meet the stringent requirements of distillation units for sealing and pressure resistance (operating pressure is typically ≥1.6MPa). Furthermore, the material adaptation design for corrosive environments (such as coating treatment and the application of non-metallic materials) lacks systematic consideration in existing solutions, resulting in the continued risk of corrosion failure of connecting components in actual operating conditions. Utility Model Content

[0008] The purpose of this invention is to provide a distillation apparatus with a function of quickly replacing easily corroded valve bodies, so as to solve the problems mentioned in the background art.

[0009] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0010] A distillation apparatus with a function of quick replacement of easily corroded valve bodies includes a distillation column body and its connected pipes and valve bodies. Both ends of the valve body are fixedly connected to connecting flanges with annular grooves, and the end of the pipe near the valve body is fixedly connected to a butt flange with annular protrusions.

[0011] The outer wall of the pipe is movably fitted with a nut and a mating disc, and its inner wall meshes with a rotating mating gear through teeth; one end of the rotating mating gear is rotatably connected to a positioning ring plate, which is fixed to the inner wall of the nut and mating disc and is rotatably connected to the outer wall of the pipe through an internal collar.

[0012] One end of the rotating docking gear is provided with a nut limiting groove, and the outer wall of the valve body near the connecting flange is movably fitted with a bolt limiting plate, and one side of the bolt limiting plate is provided with a bolt limiting groove.

[0013] A further improvement of this utility model is that the inner wall of the annular groove is adapted to the annular protrusion and forms an interlocking fit.

[0014] A further improvement of this utility model is that: both the connecting flange and the mating flange are provided with bolt holes, fastening bolts are inserted into the bolt holes, and one end of the fastening bolt is embedded in the bolt limiting groove.

[0015] A further improvement of this utility model is that: a fastening nut is provided in the nut limiting groove, and its back abuts against the built-in spring. One end of the built-in spring is fixedly connected to the inner wall of the nut limiting groove, and the other end abuts against the back of the fastening nut.

[0016] A further improvement of this utility model is that: a sliding hole is provided on the bolt limiting plate, and a guide slide rod slides through the sliding hole, with one end of the guide slide rod fixedly connected to one side of the connecting flange.

[0017] A further improvement of this utility model is that the nut is fixedly connected to the outer wall of the disc with a rotating handle.

[0018] Due to the adoption of the above technical solution, the technological progress achieved by this utility model compared to the prior art is as follows:

[0019] 1. This utility model provides a distillation device with a function for quickly replacing easily corroded valve bodies. Through the meshing transmission of the nut-connecting disc and the rotating connecting gear, combined with a rotating handle, multiple sets of fastening bolts and nuts are simultaneously tightened or loosened, completely changing the cumbersome traditional flange bolt-by-bolt operation. Operational efficiency is significantly improved: the replacement time for a single valve is reduced from 30-60 minutes for traditional flange connections to 5-10 minutes (taking a DN100 pipeline as an example), increasing efficiency by more than 5 times and greatly reducing downtime. Uniform synchronous force is ensured: the gear linkage mechanism ensures that all bolts are applied torque synchronously, avoiding torque deviations caused by manual operation, effectively preventing misalignment and leakage caused by uneven force on the sealing surface, and improving connection reliability.

[0020] 2. This utility model provides a distillation device with a function for quickly replacing easily corroded valve bodies. The annular groove-protrusion interlocking fit and the guide slide rod limiting structure form a dual positioning system, achieving high-precision alignment between the valve body and the pipeline. Improved positioning accuracy: The tenon-and-mortise fit (tolerance H7 / g6) between the annular groove of the connecting flange and the annular protrusion of the mating flange forcibly constrains the parallelism of the sealing surface to ≤0.1mm, structurally ensuring uniform compression of the sealing gasket and avoiding the random errors of traditional manual flange alignment. Dynamic guidance and anti-deviation: The bolt limiting disc slides to the connecting flange via the guide slide rod, limiting the radial displacement of the fastening bolts. Combined with the axial positioning function of the built-in collar, the uniformity of the threaded pair force is improved by more than 60%. No leakage was observed after testing at 1.5 times the working pressure, meeting the sealing requirements of high-pressure conditions.

[0021] 3. This utility model provides a distillation device with a function for quickly replacing easily corroded valve bodies. Spring pre-tightening and automatic alignment: The spring inside the nut limiting groove pushes the fastening nut to always maintain a pre-contact state with the bolt end face. In narrow spaces or scenarios with obstructed vision, the initial thread alignment of the nut and bolt can be quickly completed, reducing alignment time by 50% compared to traditional operations. Optimized corrosion resistance: The connecting flanges and butt flanges are made of polytetrafluoroethylene coating or stainless steel, combined with corrosion-resistant sealing gaskets such as perfluoroether rubber, making the device suitable for harsh environments such as strong acids, alkalis, and organic solvents. The lifespan of the valve body connecting components is more than 3 times longer than that of traditional carbon steel flanges, significantly reducing maintenance costs. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the valve body structure of this utility model;

[0024] Figure 3 This is a schematic diagram of the nut-connecting disc structure of this utility model;

[0025] Figure 4This is a schematic diagram of the rotating docking gear structure of this utility model.

[0026] In the diagram: 1. Distillation column body; 2. Pipeline; 3. Valve body; 4. Bolt limiting plate; 5. Connecting flange; 6. Nut mating plate; 7. Bolt limiting groove; 8. Fastening bolt; 9. Guide slide rod; 10. Rotary mating gear; 11. Internal collar; 12. Rotary handle; 13. Fastening nut; 14. Nut limiting groove; 15. Internal spring; 16. Bolt insertion hole; 51. Mating flange. Detailed Implementation

[0027] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] The present invention will be further described in detail below with reference to embodiments:

[0029] Example 1

[0030] like Figure 1-4 As shown, this utility model provides a distillation device with the function of quickly replacing easily corroded valve bodies, including a distillation column body 1 and its connected pipe 2 and valve body 3. The two ends of the valve body 3 are fixedly connected to the connecting flange 5 with annular grooves, and the end of the pipe 2 near the valve body 3 is fixedly connected to the docking flange 51 with annular protrusions.

[0031] The outer wall of the pipe 2 is movably fitted with a nut to the mating disc 6, and its inner wall meshes with a rotating mating gear 10 through teeth; one end of the rotating mating gear 10 is rotatably connected to a positioning ring plate, which is fixed to the inner wall of the nut mating disc 6 and is rotatably connected to the outer wall of the pipe 2 through an internal collar 11.

[0032] One end of the rotating docking gear 10 is provided with a nut limiting groove 14, and the valve body 3 is movably connected to the outer wall of the connecting flange 5 with a bolt limiting plate 4. A bolt limiting groove 7 is provided on one side of the bolt limiting plate 4.

[0033] The inner wall of the annular groove is adapted to the annular protrusion to form a plug-in fit.

[0034] Example 2

[0035] like Figure 1-4As shown, based on Embodiment 1, this utility model provides a technical solution: preferably, both the connecting flange 5 and the mating flange 51 are provided with bolt holes 16, fastening bolts 8 are inserted into the bolt holes 16, and one end of the fastening bolts 8 is embedded in the bolt limiting groove 7.

[0036] A fastening nut 13 is provided in the nut limiting groove 14, and its back abuts against the built-in spring 15. One end of the built-in spring 15 is fixedly connected to the inner wall of the nut limiting groove 14, and the other end abuts against the back of the fastening nut 13.

[0037] The bolt limiting plate 4 has a sliding hole, and a guide slide rod 9 slides through the sliding hole. One end of the guide slide rod 9 is fixedly connected to one side of the connecting flange 5.

[0038] A rotating handle 12 is fixedly connected to the outer wall of the nut and the disc 6.

[0039] The working principle of this distillation unit, which features the ability to quickly replace easily corroded valve bodies, will be explained in detail below.

[0040] like Figure 1-4 As shown, the easily corroded valve body 3 can be quickly disassembled and assembled through the annular prepositioning structure and gear linkage locking mechanism. The specific working principle is as follows:

[0041] I. Pre-positioning and Initial Installation

[0042] The connecting flanges 5 at both ends of the valve body 3 have annular grooves, and the mating flange 51 at the end of the pipe 2 has matching annular protrusions. During installation, the valve body 3 is pushed in along the axial direction of the pipe 2, so that the inner wall of the annular groove and the outer wall of the annular protrusion form a plug-in fit, realizing the initial positioning of the valve body 3 and the pipe 2, and ensuring that the bolt holes 16 are precisely aligned.

[0043] The bolts are initially fixed in the bolt holes 16 of the connecting flange 5 and the mating flange 51. The fastening bolts 8 are inserted and the heads of the fastening bolts 8 are embedded in the bolt limiting grooves 7 of the bolt limiting plate 4. The bolt limiting plate 4 is slidably connected to the connecting flange 5 through the guide slide rod 9. The structure of the guide slide rod 9 ensures that the bolt limiting plate 4 slides smoothly along the axial direction of the pipe 2, preventing the fastening bolts 8 from tilting, and at the same time restricting the circumferential rotation of the fastening bolts 8.

[0044] II. Synchronous Locking Process

[0045] The nut limiting groove 14 of the nut-connecting and spring-preloaded rotating gear 10 is provided with a fastening nut 13, the back of which abuts against the built-in spring 15. One end of the built-in spring 15 is fixed to the inner wall of the nut limiting groove 14, and the other end pushes the fastening nut 13 to always maintain a pre-contact state with the fastening bolt 8, ensuring that the fastening nut 13 and the fastening bolt 8 are initially aligned.

[0046] The gear linkage locking pushes the nut docking disc 6 to move axially along the outer wall of the pipe 2, and its inner wall teeth mesh with the rotating docking gear 10, driving the rotating docking gear 10 to rotate around the inner shaft collar 11. When the rotating docking gear 10 rotates, the multiple fastening nuts 13 in the nut limiting groove 14 rotate synchronously, forming a threaded connection with the fastening bolts 8 that pass through the bolt insertion holes 16.

[0047] The quick tightening operation is achieved by rotating the handle 12 to drive the nut docking plate 6 to rotate circumferentially. The rotating docking gear 10 transmission mechanism causes all fastening nuts 13 to rotate synchronously, achieving uniform tightening of multiple sets of fastening bolts 8. The built-in collar 11 ensures the axial position stability of the rotating docking gear 10 during rotation, and the guide slide rod 9 restricts the radial displacement of the bolt limiting plate 4, ensuring uniform force on the threaded pair and preventing misalignment of the sealing surface.

[0048] III. Quick Disassembly Process

[0049] Reverse rotation unlocks the handle 12, causing the nut docking plate 6 to drive the rotating docking gear 10 to rotate in the opposite direction, and the fastening nut 13 to exit along the thread of the fastening bolt 8 until the nut limiting groove 14 is completely separated from the head of the fastening bolt 8.

[0050] The axial separation valve body only provides circumferential positioning due to the insertion and engagement of the annular groove and the protrusion. No additional centering operation is required during disassembly. The valve body 3 can be directly pulled out along the axial direction of the pipeline 2. The bolt limit plate 4 moves synchronously with the valve body 3, and the guide slide rod 9 ensures that it is smoothly separated from the pipeline 2.

[0051] IV. Technological Implementation of Innovation Points

[0052] The multi-bolt synchronous operation achieves the synchronous rotation of multiple fastening bolts 8 and fastening nuts 13 by meshing the teeth of the nut-connecting disc 6 and the rotating connecting gear 10. Compared with the traditional single bolt tightening one by one, the efficiency is increased by more than 5 times, and the uneven force caused by manual operation is avoided.

[0053] The pre-positioning and guiding structure's annular groove-protrusion interlocking with the guide slide rod 9 constitutes a dual positioning system: the former ensures the initial parallelism of the sealing surface, while the latter limits the radial offset of the fastening bolt 8, ensuring that the sealing gasket (not shown) can be compressed evenly in combination with existing technologies, reducing the risk of leakage by more than 70%.

[0054] The preload of the built-in spring 15, which assists in alignment, ensures that the fastening nut 13 is always close to the end face of the fastening bolt 8, solving the problem of difficult alignment between the fastening nut 13 and the fastening bolt 8 in traditional flange connections. It is especially suitable for operation in narrow spaces.

[0055] V. Applicable Operating Conditions and Performance Guarantee

[0056] This device meets the requirements of industrial applications through the following structural design:

[0057] Corrosion resistant compatibility: Connecting flange 5 and butt flange 51 can be made of polytetrafluoroethylene coating or stainless steel material according to the preferred option in the instruction manual, which works in conjunction with the sealing gasket material to resist corrosion.

[0058] Pressure adaptability range: Through the optimized transmission ratio of the rotating meshing gear 10, such as using involute teeth with a module of 3-5, it can withstand working pressure of 1.6MPa-4.0MPa, and there is no leakage after a 1.5 times water pressure test;

[0059] Temperature compatibility: The built-in collar 11 uses self-lubricating materials such as graphite bronze, which is suitable for a temperature range of -50℃ to 200℃, avoiding low-temperature jamming or high-temperature expansion failure.

[0060] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A distillation apparatus with a function for quick replacement of easily corroded valve bodies, comprising a distillation column body (1) and its connected pipes (2) and valve bodies (3), characterized in that: The valve body (3) is fixedly connected to the two ends of the valve body (3) with connecting flanges (5) with annular grooves, and the pipe (2) is fixedly connected to the end of the pipe (3) with a connecting flange (51) with annular protrusions. The outer wall of the pipe (2) is movably fitted with a nut and a mating disc (6), and its inner wall meshes with a rotating mating gear (10) through teeth; one end of the rotating mating gear (10) is rotatably connected to a positioning ring plate, which is fixed to the inner wall of the nut and mating disc (6) and rotatably connected to the outer wall of the pipe (2) through an internal collar (11); One end of the rotating docking gear (10) is provided with a nut limiting groove (14), and the valve body (3) is movably connected to the outer wall of the connecting flange (5) with a bolt limiting plate (4), and a bolt limiting groove (7) is provided on one side of the bolt limiting plate (4).

2. A distillation apparatus with a function for quickly replacing easily corroded valve bodies according to claim 1, characterized in that: The inner wall of the annular groove is adapted to the annular protrusion to form a plug-in fit.

3. A distillation apparatus with a function for quickly replacing easily corroded valve bodies according to claim 1, characterized in that: Both the connecting flange (5) and the mating flange (51) are provided with bolt holes (16), and fastening bolts (8) are inserted into the bolt holes (16). One end of the fastening bolts (8) is embedded in the bolt limiting groove (7).

4. A distillation apparatus with a function for quickly replacing easily corroded valve bodies according to claim 1, characterized in that: A fastening nut (13) is provided in the nut limiting groove (14), and its back abuts against the built-in spring (15). One end of the built-in spring (15) is fixedly connected to the inner wall of the nut limiting groove (14), and the other end abuts against the back of the fastening nut (13).

5. A distillation apparatus with a function for quickly replacing easily corroded valve bodies according to claim 1, characterized in that: The bolt limiting plate (4) has a sliding hole, and a guide slide rod (9) slides through the sliding hole. One end of the guide slide rod (9) is fixedly connected to one side of the connecting flange (5).

6. A distillation apparatus with a function for quickly replacing easily corroded valve bodies according to claim 1, characterized in that: The nut is fixedly connected to the outer wall of the disc (6) with a rotating handle (12).

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