Washable oil mist treatment system waste fluid treatment end oil-water separator and method of manufacture

Abstract

This invention relates to the field of oil mist treatment and oil-water separation technology in machining, specifically to an oil-water separator at the waste liquid treatment end of a washing-type oil mist treatment system. The oil-water separator includes a cylindrical outer wall with multiple partition plates inside, forming a flow channel extending from the inlet to the outlet. From the inlet to the outlet, the oil-water separator sequentially includes a horizontal separation section, a torsional reversal section, and a vertical stratification section. In the horizontal separation section, the partition plates are horizontally positioned, and the flow channel is wide horizontally and narrow vertically. In the torsional reversal section, the partition plates gradually twist from a horizontal state to a vertical state. In the vertical stratification section, the partition plates are vertically positioned, and the flow channel is narrow horizontally and wide vertically. This design improves oil-water separation efficiency and is suitable for industrial oil mist waste liquid treatment.

Description

Technical Field

[0001] This invention relates to the field of oil mist treatment and oil-water separation technology in machining, and specifically to an oil-water separator at the waste liquid treatment end of a washing-type oil mist treatment system. Background Technology

[0002] In machining processes, CNC cutting, grinding, drilling, and other operations generate a large amount of oil mist. Suspended oil droplets not only affect the air quality in the workshop but also pose a threat to the health of operators. To prevent the oil mist from escaping, a centralized exhaust system is typically used to guide the oil mist into a scrubbing spray tower. The oil droplets are captured and washed by a high-pressure water curtain or chemical cleaning solution, and the purified gas is then discharged into the atmosphere or sent to subsequent treatment units such as filtration and electrostatic adsorption.

[0003] Inside the spray tower, oil particles carried by the washing liquid continuously collect in the collection tank at the bottom of the tower. However, due to the uneven flow field in the collection tank, the oil and water in the washing liquid cannot achieve efficient stratification within the tank. The impact of droplets on the water surface causes residual oil phase to mix with the water phase, affecting the subsequent separation and treatment effect. To ensure that the oily waste liquid (oil-water mixture) generated by the spray tower meets the requirements for environmental discharge and oil phase recovery in subsequent treatment stages, the waste liquid must be extracted and introduced into a dedicated oil-water separation device for secondary separation.

[0004] Currently, plate-type oil-water separators commonly used in industrial settings consist of dozens to hundreds of inclined baffles arranged in multiple downward-sloping flow channel units. This promotes the coalescence and upward floating of oil droplets within the channels, requiring no external power. The equipment is compact and easy to maintain. Typical plate separators have a baffle spacing of 10–20 mm and an inclination angle between 30° and 60°. Waste liquid flows downwards obliquely within the baffle channels, while oil droplets float upwards and coalesce on the bottom surface of the baffles, forming large oil droplets or oil layers. These large droplets then escape upwards against the current due to buoyancy. Since the oil droplet flow direction is opposite to the water flow direction, its ability to overcome the downward-sloping water flow resistance determines the buoyancy efficiency. Therefore, plate separators must maintain a water velocity below 10 mm / s to ensure that the coalesced droplets can float upwards against the current. Summary of the Invention

[0005] To address the aforementioned deficiencies or defects in the prior art, the present invention provides a torsion oil-water separator that can efficiently separate the oil-water mixture generated by a washing-type oil mist spray tower.

[0006] To achieve the above objectives, the present invention provides a torsional oil-water separator, comprising a cylindrical outer wall, with multiple partition plates disposed inside the outer wall, forming a flow channel extending from the inlet to the outlet between the partition plates; the oil-water separator includes, from the inlet to the outlet, a horizontal separation section, a torsional reversal section, and a vertical stratification section in sequence;

[0007] The partition plates of the horizontal separation section are set horizontally, and the flow channel is wide in the left and right direction and narrow in the up and down direction;

[0008] The partition plate of the torsion reversal section gradually twists from a horizontal state to a vertical state;

[0009] The vertically layered partitions are set vertically, and the flow channels are narrow in the left and right directions and wide in the up and down directions.

[0010] In some embodiments, the oil-facing surface of the separator is made of an oleophilic material.

[0011] In some implementations, the length of the horizontal separation segment is greater than that of the vertical layer segment.

[0012] In some implementations, the inlet is inclined above the outlet; the angle between the extension direction of the oil-water separator and the horizontal plane is α, where 5°≤α≤30°.

[0013] In some embodiments, the oil-water separator outlet is connected to an oil separator tank, and an oil collection pipe or oil skimmer is installed on the oil level of the oil separator tank.

[0014] The present invention also provides a method for manufacturing a torsion oil-water separator, wherein the horizontal separation section, the torsion reversing section, and the vertical stratification section are manufactured independently and flanges are provided at both ends, and then the ends are connected to form a complete oil-water separator;

[0015] The partition plates of the horizontal separation section and the vertical layering section extend outward toward the torsional section and overlap with the partition plates of the torsional section respectively. The overlapping parts are fixed by adhesive or welding.

[0016] This invention provides two design and manufacturing methods for the torsional reversal segment therein:

[0017] In one implementation: the torsion reversing section is divided into multiple pipe segments connected end to end, the pipe segments are of the same size; the pipe segments are manufactured independently, and then multiple pipe segments are connected end to end to form the torsion reversing section;

[0018] The two ends of the outer wall of the pipe section extend outward to form a rectangular frame-shaped pipe section flange. The pipe section flange at the outlet rotates by β degrees relative to the pipe section flange at the inlet about the extension axis of the pipe section. The angle between the inlet side and the outlet side of the partition plate section inside the pipe section is β degrees.

[0019] β=90° / n

[0020] Where 90° is the total torsion angle of the torsion reversal section, and n is the number of pipe segments that make up the torsion reversal section.

[0021] In another embodiment: the torsion reversing section includes multiple torsion partitions of the same size, which are formed by twisting and bending a metal plate as a whole. Each partition is twisted at 90° along its extension direction, with the inlet edge remaining horizontal and the outlet edge being vertical; a continuous torsion flow channel is formed between the torsion partitions;

[0022] The arrangement of multiple torsion partitions is as follows: taking any one torsion partition as a reference, they are arranged in a parallel array at equal intervals along the normal direction of the inclined section of the reference torsion partition, and the inclined section has an angle of 45° with respect to the horizontal plane.

[0023] The outer side of the torsional section is covered by a cylindrical outer wall.

[0024] The outer wall has multiple slots that fit with the sides of the torsion reversing section. The outer wall is provided with slots that correspond to the left and right sides of each torsion partition plate. The slots are formed by corner brackets on both sides of the torsion partition plate. The corner brackets are detachably connected to the outer wall.

[0025] During assembly, one side of the corner bracket can be installed first, the twist partition plate can be pressed into the outer wall and fixed with the installed corner bracket, and then the other side of the corner bracket can be installed to achieve overall fitting and fixation.

[0026] The torsion oil-water separator using the above-mentioned technical solution of the present invention has the following effects:

[0027] 1) Oil and water flow in the same direction---increase flux: The horizontal separation section, the torsional reversal section and the vertical stratification section constitute a system of flow in the same direction, so oil droplets do not need to float upwards against the direction of the customer's water flow.

[0028] 2) High-efficiency separation: Its internal structural design incorporates the physical properties of oil and water. In the horizontal separation section, the horizontally positioned separator forms a flow channel that is wide horizontally and narrow vertically, allowing oil droplets to float only a short distance upwards before contacting the top of the separator and converging to form large oil droplets or oil layers, thus accelerating the oil-water separation process. In the torsional reversal section, the separator gradually twists from a horizontal to a vertical position, and the flow channel also deforms from a horizontal to a vertical extension. During this process, oil layers and large oil droplets continuously accumulate upwards along the increasingly inclined lower surface of the separator, further promoting oil-water separation. In the vertical stratification section, the vertically positioned separator forms a flow channel that is narrow horizontally and wide vertically, causing oil to accumulate at the top of the channel and water to remain at the bottom, achieving clear oil-water stratification.

[0029] This invention also provides a manufacturing method for a torsion-type oil-water separator. Each section is modularly designed, manufactured independently, and assembled via flange connections, allowing for flexible installation. Maintenance is facilitated by disassembling the sections, making replacement or cleaning of the partition plates simple. The partition plates utilize overlapping connections, improving the smoothness of the connected plates and reducing the risk of leakage and blockage. Attached Figure Description

[0030] Figure 1 This is a perspective view of the torsion oil-water separator of the present invention;

[0031] Figure 2 This is a perspective view of a pipe section according to Embodiment 1 of the manufacturing method of the present invention;

[0032] Figure 3 yes Figure 2 A three-dimensional view of the entire torsion reversal section formed by splicing the middle pipe sections;

[0033] Figure 4 This is a schematic diagram of the arrangement of the torsion partition plates in Embodiment 2 of the manufacturing method of the present invention;

[0034] Figure 5 yes Figure 4 A schematic diagram of the torsion partition plate viewed from the inlet to the outlet.

[0035] Figure 6 This is a side view of an oil-water separator;

[0036] Figure 7 yes Figure 6 A cross-sectional view of the initial section of the middle AA section, i.e. the horizontal separation section, with a portion of it enlarged;

[0037] Figure 8 yes Figure 6 A cross-sectional view of the middle BB, i.e., the end of the horizontal separation section, with a portion of it enlarged;

[0038] Figure 9 yes Figure 6 A cross-sectional view of the initial segment of the CC section, i.e., the torsional reversal segment, with a portion of it enlarged.

[0039] Figure 10 yes Figure 6 A cross-sectional view of the middle section of the DD (mid-section of the torsional reversal segment), with a portion of it enlarged.

[0040] Figure 11 yes Figure 6 The middle section is a cross-sectional view of the end EE of the torsional reversal segment, with a portion of it enlarged.

[0041] Figure 12 yes Figure 6 The cross-sectional view along the middle FF, i.e., the vertically layered section, is enlarged.

[0042] Explanation of reference numerals in the attached figures

[0043] 1-Horizontal separation section; 2-Twist reversal section; 2a-Pipe section; 3-Vertical layering section; 4-Separation plate; 4a-Twist separation plate; 5-Outer wall. Detailed Implementation

[0044] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0045] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0046] This invention provides an oil-water separator for the waste liquid treatment end of a washing-type oil mist treatment system, comprising a cylindrical outer wall 5, with multiple partition plates 4 disposed within the outer wall 5, forming a flow channel extending from the inlet to the outlet between the partition plates 4; the oil-water separator sequentially includes a horizontal separation section 1, a torsion reversal section 2, and a vertical stratification section 3 from the inlet to the outlet. The partition plates 4 in the horizontal separation section 1 are horizontally arranged, with the flow channel being wider in the left-right direction and narrower in the vertical direction. The partition plates 4 in the torsion reversal section 2 gradually twist from a horizontal state to a vertical state. The partition plates 4 in the vertical stratification section 3 are vertically arranged, with the flow channel being narrower in the left-right direction and wider in the vertical direction.

[0047] An oil-water separator is used to separate oil-water mixtures. It mainly consists of a cylindrical outer wall 5 and partition plates 4. Depending on their function, the oil-water separator can be divided into a horizontal separation section 1, a torsional reversal section 2, and a vertical stratification section 3 from the inlet to the outlet.

[0048] The cylindrical outer wall 5 is made of stainless steel, which is corrosion-resistant and high-strength, enabling stable operation for extended periods and resisting corrosion and erosion from oil-water mixtures, thus ensuring the equipment's service life. The front and rear ends of the cylindrical outer wall 5 are the inlet and outlet, respectively.

[0049] One side of the separator 4 (the lower surface of the horizontal separation section 1, extending to the end of the separator 4) is made of an oleophilic material or has an oleophilic coating, such as oleophilic polypropylene fiber. The separator 4 of the horizontal separation section 1 is set horizontally, forming a flow channel that is wide from left to right and narrow from top to bottom. Oil droplets can easily float to the separator 4 and aggregate into an oil layer or large oil droplets.

[0050] The partition plate 4 of the torsion reversal section 2 gradually twists from a horizontal state to a vertical state. The flow channel deforms from a lateral extension to a vertical extension, and the oil layer and large oil droplets accumulate upward along the lower surface of the inclined partition plate 4.

[0051] The vertically layered section 3 has a vertically set partition plate 4, forming a flow channel that is narrow on the left and right and wide on the top and bottom. Oil accumulates at the top of the flow channel, while water is located at the bottom.

[0052] The spacing of the separator plates is designed to be 10-30mm to ensure that the oil-water mixture flows and separates fully in the flow channel, while avoiding blockage and short-circuiting.

[0053] like Figures 7-12 As shown, the gap between the partition plates 4 is the flow channel.

[0054] The flow channel of horizontal separation section 1 is wide from side to side and narrow from top to bottom (see attached). Figure 7 , 8 The oil droplets have a short rising distance, allowing them to quickly contact and accumulate with the separator plate e. Torque reversal section 2 (attached) Figure 9 , 10 The flow channel of section 11) changes with the twisting of the partition plate 4, causing the oil droplets to continuously accumulate during their ascent. Vertical stratification section 3 (attached) Figure 12 The flow channel is narrow on the left and right sides and wide on the top and bottom, providing clear space for the stratification after oil-water separation, with oil on the top layer and water on the bottom layer.

[0055] In one embodiment of this application, the length of the horizontal separation section 1 is set to be greater than that of the vertical stratification section 3. This is because the oil-water mixture exhibits different morphologies in the horizontal separation section 1 and the vertical stratification section 3. In the horizontal separation section 1, oil sludge is suspended and dispersed in the water as small oil droplets, while in the vertical stratification section 3, oil droplets mainly exist as large-diameter oil droplets or oil layers. According to Stokes' law, the radius (r) of an oil droplet is proportional to the square root of its rising velocity (v), meaning that larger oil droplets rise faster.

[0056] Since smaller droplets are less likely to separate into layers with water, the length of the horizontal separation section 1 is set to be greater than that of the vertical stratification section 3. The liquid (oil-water mixture) requires a longer flow time in the horizontal separation section 1 for small oil droplets to converge at the top of the channel, thus forming large-diameter oil droplets or an oil layer. Then, in the vertical stratification section 3, the small oil droplets have formed large-diameter oil droplets or an oil layer. Large-diameter oil droplets rise quickly and easily separate into layers with water. Therefore, the length of the vertical stratification section 3 can be set shorter, i.e., shorter than that of the horizontal separation section 1.

[0057] The length of the torsion reversing section 2 is determined by the liquid velocity, the Reynolds number of the liquid, and the width of the flow channel, so as to keep the liquid flowing in a laminar state in the torsion reversing section 2 as much as possible.

[0058] like Figure 1 As shown, the oil-water separator is generally horizontally positioned with a slight inclination angle α (α is set to 5°-30°), making the outlet slightly higher than the inlet. This arrangement facilitates the discharge of the oil layer separated from the vertical separation section 3 from the oil-water separator outlet and prevents impurity deposition, improving the separator's anti-clogging capability. The upward inclination of the oil-water separator prevents heavier solid deposits from entering or settling within it. Lighter floating debris also moves more easily upwards with the water flow and flows out of the separator. To further prevent clogging, a detachable filter is installed at the inlet. The filter prevents larger impurities from entering the separator and clogging the flow channels, and also stabilizes the water flow, reducing disturbance at the inlet and promoting oil-water separation in the horizontal separation section 1.

[0059] The oil-water separator outlet is connected to an oil-water separation tank. An oil collection pipe or oil skimmer is installed on the surface of the oil in the oil-water separation tank. The liquid flow in the oil-water separation tank is slow and almost static. The oil droplets that have been separated by the oil-water separator are generally large and will quickly float to the surface of the oil in the oil-water separation tank, forming a floating oil layer.

[0060] The present invention also provides a method for manufacturing the torsion oil-water separator provided by the present invention. In this method, refer to the appendix... Figure 1 The horizontal separation section 1, the torsion reversal section 2, and the vertical stratification section 3 are manufactured independently and flanges are installed at both ends. Then they are connected end to end to form a complete oil-water separator.

[0061] The partition plates 4 of the horizontal separation section 1 and the vertical layering section 3 extend outward toward the torsional section 2 and overlap with the partition plates 4 of the torsional section 2, respectively. The overlapping parts are fixed by adhesive or welding. After this splicing, the partition plates 4 can be effectively connected into one piece to form a continuous flow channel.

[0062] The horizontal separation section 1 and the vertical layering section 3 have the same structure, differing only in length, and can be installed using the same process. The structures of both the horizontal separation section 1 and the vertical layering section 3 are relatively simple, consisting of multiple parallel partition plates 4 installed within a rectangular pipe, with the partition plates 4 connected to the pipe sidewalls on both sides. The manufacturing process is the same as the main body of a traditional plate-type oil-water separator, and therefore will not be described in detail.

[0063] The following are two specific embodiments of the torsion reversal segment 2:

[0064] Example 1

[0065] In this embodiment, the torsion reversal segment 2 has the following structural features, see attached diagram. Figure 2 and attached Figure 3 The torsion reversing section 2 is divided into multiple pipe segments 2a connected end to end. Pipe segments 2a are of the same size. Each pipe segment 2a is manufactured independently, and then multiple pipe segments 2a are connected end to end to form the torsion reversing section 2. The outer walls 5 of each pipe segment 2a extend outwards at both ends to form rectangular flanges. The flange at the outlet of the pipe segment 2a rotates by β degrees relative to the flange at the inlet of the pipe segment 2a around the extension axis of the pipe segment 2a. The angle between the inlet and outlet edges of the partition plate 4 segment within the pipe segment 2a is β degrees.

[0066] β=90° / n

[0067] Where 90° is the total torsion angle of the torsion reversal section 2, and n is the number of pipe segments 2a that make up the torsion reversal section 2.

[0068] Manufacturing process:

[0069] 1) Produce each segment separately in the workshop and install flanges at both ends of the segment;

[0070] 2) Connect the horizontal separation section 1 to the flange of the first torsional reversing pipe section 2a, and fasten it with bolts and sealing gaskets;

[0071] 3) Connect the remaining torsion reversing pipe sections 2a sequentially until the 90° torsion section is completed;

[0072] 4) Connect the last section of the torsion reversing pipe 2a to the flange of the vertical layered section 3;

[0073] 5) Check the flange sealing, adjust the flow rate and gaskets to ensure there are no leaks and the pipe sections are aligned.

[0074] This embodiment enables modular production and assembly, reducing manufacturing costs while ensuring segment precision. Only pipe segments 2a with uniform dimensions need to be manufactured; multiple segments 2a can be continuously spliced ​​together to form the torsion reversal segment 2. Furthermore, each pipe segment 2a has a small torsion angle and a short length, and the internally installed partition plate 4 has a small torsion angle, simplifying processing and manufacturing.

[0075] Example 2

[0076] In this embodiment, the torsion reversing segment 2 has the following structural features, as shown in the attached figure. Figure 3 , 4 The torsion reversing section 2 includes multiple torsion partition plates 4a of the same size. The torsion partition plates 4a are formed by twisting and bending a metal plate as a whole. Each torsion partition plate 4a is twisted at 90° along its extension direction, with the inlet edge remaining horizontal and the outlet edge being vertical, forming a continuous torsion flow channel between the torsion partition plates 4a.

[0077] The arrangement of multiple torsion partition plates 4a is as follows: taking any one torsion partition plate 4a as a reference, they are arranged in a parallel array at equal intervals along the normal direction of the inclined section of the reference torsion partition plate 4a, and the inclined section is at an angle of 45° with respect to the horizontal plane.

[0078] The outer side of the torsion reversing section 2 is covered by a cylindrical outer wall 5. The outer wall 5 has multiple slots that mate with the sides of the torsion reversing section 2. The outer wall 5 also has slots corresponding to the left and right sides of each torsion partition plate 4a. These slots are formed by corner brackets on both sides of the torsion partition plate 4a, which are detachably connected to the outer wall 5. During assembly, one side of the corner bracket can be installed first, pressing the torsion partition plate 4a into the outer wall 5 and fixing it to the installed corner bracket. Then, the other side of the corner bracket can be installed to achieve overall fitting and fixation.

[0079] Manufacturing process:

[0080] 1) Forming of the twisted partition plate 4a: A stainless steel plate of appropriate thickness (approximately 2mm) is selected and twisted 90° using a continuous bending machine to form the twisted partition plate 4a. The 90° twist ensures that its inlet edge remains horizontal and its outlet edge remains vertical.

[0081] 2) Manufacturing the outer wall 5: The outer wall 5 consists of four surfaces. The left and right outer walls, which are connected to the torsion partition plate 4a, have the same dimensions and are both curved plates. They can be manufactured by making a curved outer frame and then attaching the plates to the outer frame. The plates themselves are relatively easy to bend and deform, and easy to attach to the curved outer frame.

[0082] The upper and lower outer walls are not connected to the torsion partition plate 4a, and the dimensions of the upper and lower outer walls are the same. The dimensions and outlines of the upper and lower outer walls are also the same as those of the torsion partition plate 4a, and the same manufacturing process as the torsion partition plate 4a can be used.

[0083] 3) Fixing the left and right outer walls: Set the manufactured left and right side walls on the installation station. The installation station is equipped with brackets, which are used to fix the left and right outer walls 5.

[0084] 4) Embedded partition plate 4: Fix the corner brackets below the torsion partition plate 4a to the left and right outer walls. Multiple corner brackets are fixed sequentially along the contact lines between the torsion partition plate 4a and the left and right outer walls 5.

[0085] Next, hoist the torsion partition plate 4a between the left and right outer walls, calibrate its position so that the torsion partition plate 4a fits into the corner bracket, and fix it with glue or resistance welding.

[0086] Then, the corner brackets on the other side of the torsion partition plate 4a are set in place and connected and fixed to the torsion partition plate 4a and the left and right outer walls respectively.

[0087] Finally, waterproofing measures can be implemented.

[0088] Repeat the above process until all torsion partitions 4a are installed.

[0089] 5) Forming the outer wall 5: Install the upper and lower outer walls in place and connect them with the left and right outer walls. Make sure the joints are waterproof and fixed to form a complete cylindrical outer wall 5.

Claims

1. A twisted oil-water separator characterized by, It includes a cylindrical outer wall (5), and multiple partition plates (4) are provided inside the outer wall (5); a flow channel extending from the inlet to the outlet is formed between the partition plates (4); the oil-water separator includes a horizontal separation section (1), a torsion reversal section (2) and a vertical stratification section (3) from the inlet to the outlet. The partition plate (4) of the horizontal separation section (1) is set horizontally, and the flow channel is wide in the left and right direction and narrow in the up and down direction; The partition plate (4) of the torsion reversal section (2) is gradually twisted from a horizontal state to a vertical state; The partition plate (4) of the vertical layer section (3) is set vertically, and the flow channel is narrow in the left and right direction and wide in the up and down direction.

2. The twisted oil-water separator of claim 1, wherein, The surface of the separator (4) on the oil-facing side is made of an oleophilic material.

3. The twisted oil-water separator of claim 1, wherein, The length of the horizontal separation segment (1) is greater than that of the vertical layer segment (3).

4. The twisted oil-water separator of claim 1, wherein, The inlet is set at an angle higher than the outlet; the angle between the extension direction of the oil-water separator and the horizontal plane is α, 5°≤α≤30°.

5. The twisted oil-water separator of claim 1, wherein, The oil-water separator outlet is connected to an oil separator tank, and an oil collection pipe or oil skimmer is installed on the oil level of the oil separator tank.

6. A method of manufacturing the twisted oil-water separator of any one of claims 1-5, wherein, The horizontal separation section (1), the torsional reversal section (2), and the vertical stratification section (3) are manufactured independently and flanges are installed at both ends. Then they are connected end to end to form a complete oil-water separator. The partition plates (4) of the horizontal separation section (1) and the vertical layering section (3) extend outward toward the torsional section (2) and overlap with the partition plates (4) of the torsional section (2) respectively. The overlapping parts are fixed by adhesive or welding.

7. The manufacturing method according to claim 6, characterized in that, The torsion reversing section (2) is divided into multiple pipe segments (2a) connected end to end. The pipe segments (2a) are of the same size. The pipe segments (2a) are manufactured independently, and then multiple pipe segments (2a) are connected end to end to form the torsion reversing section (2). The two ends of the outer wall (5) of the pipe section (2a) extend outward to form a rectangular frame-shaped pipe section (2a) flange. The pipe section (2a) flange at the outlet rotates by β degrees relative to the pipe section (2a) flange at the inlet about the extension axis of the pipe section (2a). The angle between the inlet side and the outlet side of the partition plate (4) segment inside the pipe section (2a) is β degrees. Wherein, 90° is the total torsion angle of the torsion reversal section (2), and n is the number of pipe segments (2a) that make up the torsion reversal section (2).

8. The manufacturing method according to claim 6, characterized in that, The torsion reversing section (2) includes multiple torsion partition plates (4a) of the same size. The torsion partition plates (4a) are formed by twisting and bending a metal plate as a whole. Each torsion partition plate (4a) is twisted at 90° along its extension direction. The inlet edge remains horizontal and the outlet edge is vertical. A continuous torsion flow channel is formed between each torsion partition plate (4a). The arrangement of multiple torsion partition plates (4a) is as follows: taking any one torsion partition plate (4a) as a reference, they are arranged in a parallel array at equal intervals along the normal direction of the inclined section of the reference torsion partition plate (4a), and the inclined section has an angle of 45° with respect to the horizontal plane. The outer side of the torsional reversal segment (2) is covered by a cylindrical outer wall (5).

9. The manufacturing method according to claim 8, characterized in that, The outer wall (5) has multiple slots that fit with the side of the torsion reversing section (2). The outer wall (5) is provided with slots corresponding to the left and right sides of each torsion partition plate (4a). The slots are formed by corner brackets on both sides of the torsion partition plate (4a). The corner brackets are detachably connected to the outer wall (5). During assembly, one side of the corner bracket can be installed first, the twisting partition plate (4a) can be pressed into the outer wall (5) and fixed with the installed corner bracket, and then the other side of the corner bracket can be installed to achieve overall fitting and fixing.

Images