Medium conveying pipeline

Abstract

The invention relates to the technical field of medium conveying, and discloses a medium conveying pipeline. The medium conveying pipeline comprises a pipeline body and a flow guide part, a medium flow channel is formed in the pipeline body, and a medium inlet and a medium outlet which communicate with the medium flow channel are formed in the two ends of the pipeline body correspondingly; the flow guide part is arranged in the medium flow channel, the flow guide part can guide a flowing path of a medium flowing into the medium flow channel, the gas phase and the liquid phase of the medium conveyed along the flowing path are separated, and the gas phase and the liquid phase jointly flow out of the medium outlet. According to the medium conveying pipeline, the flow guide part is arranged in the pipeline body, so that the medium can move along the preset flowing path, the gas phase and the liquid phase of the medium are separated, the flowing state rule, the slug flow and the slug flow of the gas phase and the liquid phase of the medium disappear, the purpose of reducing vibration of the medium conveying pipeline can be achieved, and the working efficiency of the medium conveying pipeline is improved. And potential safety hazards existing in the using process of the medium conveying pipeline are reduced or eliminated.

Description

Technical Field

[0001] This invention relates to the field of media transportation technology, and more specifically to a media transportation pipeline. Background Technology

[0002] Two-phase flow-induced pipeline vibration is a widespread problem in various engineering applications, such as pipelines in the chemical industry, industrial two-phase heat exchangers, and outlet pipelines of hydrogen electrolyzers. When gas and liquid flow within a pipeline, the flow pattern may gradually separate from a mixed state, developing into slug flow or plug flow, causing strong vibrations. At points such as pipeline tees, where fluids converge, the drastic changes in gas-liquid flow also lead to intense vibrations. Prolonged vibration inevitably results in wear and stress fatigue of the pipe structure, especially at the connection between the pipe and equipment, and may even cause leaks and damage at the interface between the equipment and the pipe, posing significant safety hazards.

[0003] Currently, existing vibration reduction technologies for two-phase flow-induced pipeline system vibration mainly include optimizing pipeline layout and installing supports. Optimizing pipeline layout primarily involves using large-radius elbows and 45° angled tees, which can reduce pipeline vibration to some extent. Installing supports enhances the pipeline's vibration resistance by reinforcing the support's rigidity. Rigid supports are generally preferred, minimizing the use of spring supports, and guide frames and limit frames are used. Damping dampers are installed when necessary. While supports can limit the vibration amplitude of pipelines to some extent, they cannot eliminate pipeline vibration.

[0004] Optimizing pipe layout cannot effectively prevent slug flow and slug flow within the pipes. Therefore, it can only reduce the number of vibration points to a certain extent and cannot completely solve the vibration problem caused by two-phase flow. This is because elbows and connecting pipes cannot be completely eliminated from the piping system. Usually, there will be inclined pipes or risers in the piping system, which are the most common causes of slug flow and slug flow.

[0005] The methods of installing supports are either passively fixing the pipes or using dampers to attenuate vibrations. The disadvantages of fixing with supports or installing dampers are that certain installation conditions are required, the installation is relatively complex, and it will damage the aesthetics of the pipeline.

[0006] It is evident that current methods for reducing vibration cannot prevent the formation of slug flow and bullet flow inside the pipe; essentially, vibration still exists, and safety hazards remain. Summary of the Invention

[0007] In order to solve the above-mentioned technical problems, or at least partially solve the above-mentioned technical problems, the present invention provides a medium conveying pipeline.

[0008] This invention provides a medium conveying pipeline, comprising:

[0009] The pipe body has a medium flow channel inside, and the two ends of the pipe body are respectively provided with a medium inlet and a medium outlet that communicate with the medium flow channel;

[0010] A flow guide is disposed within the medium flow channel. The flow guide is capable of guiding the flow path of the medium flowing into the medium flow channel, and causing the gas phase and liquid phase of the medium conveyed along the flow path to be separated, and the gas phase and the liquid phase flow out of the medium outlet together.

[0011] Optionally, the flow guide includes at least one spiral twisted piece disposed within the medium flow channel, wherein the outer periphery of the spiral twisted piece and the inner wall of the pipe body form the flow path, and the flow path is spiral in shape.

[0012] Optionally, there are multiple spiral twisted blades, which are spaced apart along the extension direction of the pipe body.

[0013] Optionally, there is one spiral twisted piece, and the length of the spiral twisted piece matches the length of the pipe body.

[0014] Optionally, the axis of the helical twisting vane coincides with the axis of the pipe body.

[0015] Optionally, the pitch of the helical twisted blade is P, and the diameter of the pipe body is D, wherein 0.5D < P < 2D.

[0016] Optionally, the multiple pitches of the helical twisted blade may be the same or different.

[0017] Optionally, the two ends of the pipe body are respectively provided with a first connecting flange and a second connecting flange.

[0018] Optionally, the distance between the end of the pipe body and the first connecting flange is h, and the diameter of the pipe body is D, wherein 0.6D < Δh < 2D;

[0019] And / or, the distance between the end of the pipe body and the second connecting flange is h, and the diameter of the pipe body is D, wherein 0.6D < Δh < 2D.

[0020] Optionally, the pipe body is in the form of a straight pipe or a bent pipe.

[0021] The technical solution provided by the embodiments of the present invention has the following advantages compared with the prior art:

[0022] The medium conveying pipeline provided by the present invention enables the medium to move along a preset flow path by setting a flow guide inside the pipeline body, and enables the gas phase and liquid phase of the medium to be separated, so that the flow state of the gas phase and liquid phase of the medium is regular, and the slug flow and block flow disappear. This can achieve the purpose of reducing the vibration of the medium conveying pipeline and reducing or eliminating the safety hazards existing in the use of the medium conveying pipeline. Attached Figure Description

[0023] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of the medium conveying pipeline according to an embodiment of the present invention;

[0026] Figure 2 The flow pattern of the medium described in the embodiments of the present invention is bubbly flow;

[0027] Figure 3 The flow pattern of the medium described in this embodiment of the invention is slug flow;

[0028] Figure 4 The flow pattern of the medium described in the embodiments of the present invention is slug flow;

[0029] Figure 5 This is a diagram showing the flow pattern changes inside a pipe when the medium is transported without using a pipe with spiral twisting vanes.

[0030] Figure 6 This is a flow pattern diagram showing the internal flow pattern changes of the pipeline body when the medium is transported using the medium transport pipeline described in the embodiments of the present invention.

[0031] Explanation of reference numerals in the attached figures

[0032] 1. Pipe body; 11. Medium flow channel; 12. Medium inlet; 13. Medium outlet; 2. Flow guide; 21. Spiral twisting vane; 3. First connecting flange; 4. Second connecting flange. Detailed Implementation

[0033] To better understand the above-mentioned objectives, features, and advantages of the present invention, the solutions of the present invention will be further described below. It should be noted that, unless otherwise specified, the embodiments and features of the present invention can be combined with each other.

[0034] The following description sets forth many specific details to provide a full understanding of the invention, but the invention may also be practiced in other ways different from those described herein; obviously, the embodiments described in the specification are only some, not all, of the embodiments of the invention.

[0035] The main cause of pipe vibration due to gas-liquid two-phase flow is closely related to the flow pattern inside the pipe. Different flow patterns will cause different vibration patterns and different degrees of vibration intensity. Figure 2 The medium in the middle is a bubble flow, and the vibration caused by the bubble flow is relatively small. Figure 3 The flow pattern of the medium is slug flow. Figure 4 The flow pattern of the medium is slug flow, and slug flow and plug flow cause the most severe vibrations. The most common cause of slug flow is the presence of downsloping or riser pipes in the pipeline. The alternating flow of gas and liquid in the pipeline will form intermittent liquid and gas plugs. In addition, changes in pipe size or flow velocity can also cause slug flow. Slug flow is formed by the increase in gas flow rate, which leads to bubble coalescence and eventually slug flow. Or, porosity wave instability leads to bubble coalescence and slug flow.

[0036] like Figure 1 As shown, the medium conveying pipeline provided in the embodiment of the present invention includes a pipeline body 1 and a flow guide 2.

[0037] The interior of the pipe body 1 forms a medium flow channel 11, which allows the medium to flow. The two ends of the pipe body 1 are respectively provided with a medium inlet 12 and a medium outlet 13 communicating with the medium flow channel 11. The medium can flow into the medium flow channel 11 through the medium inlet 12 and then flow out to the target location through the medium outlet 13. The medium at this location includes both gas and liquid phases.

[0038] The flow guide 2 is disposed within the medium flow channel 11. The connection method between the flow guide 2 and the medium flow channel 11 is unrestricted, such as welding. The flow guide 2 can guide the flow path of the medium flowing into the medium flow channel 11 and separate the gas phase and liquid phase of the medium conveyed along the flow path. This separation refers to separation along the direction perpendicular to the flow direction of the medium, so that the gas phase and liquid phase flow in layers, avoiding the formation of slug flow or block flow. The gas phase and liquid phase flow out of the medium outlet 13 together and flow to the next target position through the medium outlet 13.

[0039] The medium conveying pipeline provided by this invention, by setting a flow guide 2 inside the pipeline body 1, enables the medium to move along a preset flow path and separates the gas and liquid phases of the medium, resulting in a regular flow state of the gas and liquid phases and eliminating slug flow and plug flow. This achieves the purpose of reducing vibration of the medium conveying pipeline and reducing or eliminating safety hazards during the use of the medium conveying pipeline. In addition, the flow guide 2 is set inside the pipeline body 1, and the installation of the flow guide 2 is simple, does not depend on external installation conditions, and does not disrupt the existing pipeline layout.

[0040] In some implementations, such as Figure 1 As shown, the flow guide 2 includes at least one spiral twisted blade 21 disposed in the medium flow channel 11. The outer periphery of the spiral twisted blade 21 and the inner wall of the pipe body 1 form a flow path, making the flow path spiral.

[0041] Specifically, the spiral twisted vane 21 includes a screw shaft and a twisted vane spirally wound around the outer circumference of the screw shaft, with the spirally extended vane forming a spiral flow path. During installation, in order to facilitate the insertion of the spiral twisted vane 21 into the medium flow channel 11, the outer diameter of the spiral twisted vane 21 should be slightly smaller than the diameter of the medium flow channel 11, so that the spiral twisted vane 21 can be inserted into the medium flow channel 11, and the distance between the spiral twisted vane 21 and the inner wall of the pipe body 1 is small, so that the outer circumference of the spiral twisted vane 21 and the inner wall of the pipe body 1 form a spiral flow path.

[0042] In this design, after the medium enters the medium flow channel 11, it is transported along a spiral flow path. The spiral twisting vane 21 then transforms the linear transport path into a spiral transport path. At this point, due to the density difference between the gas and liquid phases in the medium, the gas and liquid phases separate under centrifugal force. The gas phase, with its lower density, accumulates at the screw axis of the spiral twisting vane 21 to form a gas core. The liquid phase, with its higher density, is thrown to the inner wall of the pipe body 1 under centrifugal force, causing the liquid phase to surround the gas phase and be transported synchronously with it. Both then flow together to the next target location through the medium outlet 13. This design facilitates the formation of the flow path, resulting in a regular flow state for the medium. Slug flows and block flows disappear, effectively reducing the vibration problems of the pipe body 1 caused by slug flows and block flows.

[0043] In this application, the arrangement of the helical twisted piece 21 may include multiple embodiments, and the various arrangements of the helical twisted piece 21 are described below:

[0044] First implementation method

[0045] There are multiple spiral twisted blades 21, which are spaced apart along the extension direction of the pipe body 1.

[0046] The arrangement of multiple spiral twisted blades 21 at intervals ensures that after the medium enters the medium flow channel 11, the medium is transported along a spiral flow path. The spiral twisted blades 21 transform the straight transport path of the medium into a spiral transport path. Under the action of centrifugal force, the gas phase forms a gas core at the screw shaft position, and the liquid phase surrounds the outer periphery of the gas phase and is transported synchronously with the gas phase. When the medium moves to the gap position between two adjacent spiral twisted blades 21, the medium still maintains the state of the liquid phase surrounding the outer periphery of the gas phase and being transported synchronously with the gas phase under the action of inertial force. After entering the next spiral twisted blade 21, it plays a spiral guiding role for the transport of the medium, ensuring that the medium can be continuously transported along the spiral trajectory and separating the gas phase and liquid phase.

[0047] This design reduces the length of a single spiral twisted piece 21, thereby reducing the manufacturing difficulty and cost of the spiral twisted piece 21.

[0048] It is understandable that the spacing between two adjacent spiral twisting blades 21 can be the same or different. These are not restrictive, as long as it is ensured that the medium after being guided by multiple spiral twisting blades 21 can achieve gas-phase and liquid-phase separation and transportation.

[0049] Second implementation method

[0050] There is one spiral twisted piece 21, and the length of the spiral twisted piece 21 matches the length of the pipe body 1. The length matching here means that the length of the spiral twisted piece 21 is less than the length of the pipe body 1, and the length of the spiral twisted piece 21 is close to the length of the pipe body 1.

[0051] After the medium enters the medium flow channel 11, when it passes through the spiral twisting plate 21, the medium will be transported along a spiral flow path. Then, the spiral twisting plate 21 converts the straight transport path of the medium into a spiral transport path. Under the action of centrifugal force, the gas phase forms a gas core at the position of the spiral shaft, and the liquid phase surrounds the outer periphery of the gas phase and is transported synchronously with the gas phase. When the medium moves to the end of the spiral twisting plate 21, under the action of inertial force, the medium still maintains the state in which the liquid phase surrounds the outer periphery of the gas phase and is transported synchronously with the gas phase, and maintains this state to flow out of the pipe body 1.

[0052] It is understandable that the distances between the two ends of the spiral twisting vane 21 and the two ends of the pipe body 1 can be the same or different, and the dimensions can be designed according to actual needs. However, it must be ensured that the medium guided by the spiral twisting vane 21 remains in a spiral conveying state after being output from the medium outlet 13 of the pipe body 1. Furthermore, when receiving the spirally conveyed medium, the medium entering the pipe body 1 should remain in a spiral conveying state before entering the spiral twisting vane 21.

[0053] It is understandable that the length difference between the spiral twisting vane 21 and the length of the pipe body 1 can be relatively large, but it is necessary to ensure that the medium after being guided by the spiral twisting vane 21 is output through the medium outlet 13 of the pipe body 1 and still maintains the spiral conveying state.

[0054] In some embodiments, the axis of the spiral twisting vane 21 coincides with the axis of the pipe body 1.

[0055] This design increases the compatibility between the spiral twisted plate 21 and the pipe body 1, allowing the spiral twisted plate 21 to penetrate into the pipe body 1 along the axial direction, and ensuring that the outer circumference of the spiral twisted plate 21 fits against the inner wall of the pipe body 1 or that the gap between the two is uniform, thus ensuring the effective transport of the medium.

[0056] In some embodiments, the pitch of the helical twisting vane 21 is P, and the diameter of the pipe body 1 is D, wherein 0.5D < P < 2D.

[0057] In this design, after the medium enters the flow path formed between the spiral twisting vane 21 and the pipe body 1, it can achieve separation of the gas phase and the liquid phase under the action of centrifugal force, ensuring the separation effect between the gas phase and the liquid phase.

[0058] In some embodiments, the helical twisted vane 21 has multiple identical pitches.

[0059] With this design, the spiral twisted blade 21 can form a uniform flow path, ensuring stable delivery of the medium. The uniform spiral twisted blade 21 can also reduce manufacturing difficulty and increase manufacturing convenience.

[0060] In some implementations, the helical twisted vane 21 has multiple different pitches.

[0061] In this design, the cross-sectional width of different sections of the flow path formed by the spiral twisting vane 21 is different, so as to change the flow speed of the medium after entering different sections, which can realize the acceleration or deceleration of the medium, meet the separation requirements of the gas phase and liquid phase of the medium, and at the same time ensure that the medium output through the pipeline body 1 is transported along the spiral and the gas phase and liquid phase are separated.

[0062] Understandably, the pitch of the spiral twisting vane 21 gradually decreases along the direction towards the medium outlet 13, so that the medium is in an accelerated state, ensuring the spiral transport of the medium flowing out of the pipe body 1, and enabling the medium entering the next pipe body 1 to be spirally transported. Alternatively, the pitch of the spiral twisting vane 21 gradually increases along the direction towards the medium outlet 13, so that the medium is in a decelerated state, preventing the medium flowing into the next target position from having an excessively high flow rate.

[0063] It can be seen that the arrangement of the pitch of the spiral twisted plate 21 in this application is not limited and can be selected according to actual needs.

[0064] In some embodiments, the two ends of the pipe body 1 are respectively provided with a first connecting flange 3 and a second connecting flange 4.

[0065] Specifically, when the length of the pipe body 1 is greater than 2m, a first connecting flange 3 and a second connecting flange 4 are fixedly connected to both ends of the pipe body 1, respectively, so as to connect with the adjacent pipe body 1 or other components through the first connecting flange 3 and the second connecting flange 4, thereby increasing the strength and sealing of the connection.

[0066] In some embodiments, the distance between the end of the pipe body 1 and the first connecting flange 3 is h, and the diameter of the pipe body 1 is D, wherein 0.6D < Δh < 2D.

[0067] This design ensures that the medium entering the pipe body 1 along the spiral trajectory remains in a spiral conveying state before reaching the flow path, ensuring that it can be conveyed along the spiral trajectory in multiple pipe bodies 1, thus ensuring the separation and conveying of the gas phase and liquid phase and avoiding the phenomenon of vibration of the pipe body 1.

[0068] In some embodiments, the distance between the end of the pipe body 1 and the second connecting flange 4 is h, and the diameter of the pipe body 1 is D, wherein 0.6D < Δh < 2D.

[0069] This design ensures that the medium being conveyed by the spiral twisting plate 21 remains in a spiral conveying state after flowing out of the end of the spiral twisting plate 21. At the same time, it ensures that the medium flowing out of the medium outlet 13 of the pipeline body 1 is conveyed along the spiral trajectory, thereby ensuring the separation and conveying of the gas phase and liquid phase and avoiding the phenomenon of vibration of the pipeline body 1.

[0070] In some embodiments, the pipe body 1 is either straight or curved. When the pipe body 1 is straight, the helical twisting vane 21 extends along the axial direction of the pipe body 1. When the pipe body 1 is curved, the extension direction of the helical twisting vane 21 is consistent with the extension direction of the bend, ensuring the formation of a flow path and ensuring the effective transport of the medium.

[0071] It is evident that the extension method of the pipe body 1 in this application is not limited and can be designed according to actual needs.

[0072] Below is an example with 1000 Nm 3 Specific embodiments and comparative examples of the / h alkaline electrolyzer are described.

[0073] 1000Nm 3The alkaline solution in the / h alkaline electrolytic cell is mainly composed of KOH solution. The outlet of the electrolytic cell is a two-phase flow of alkaline solution and hydrogen gas, which then enters the medium delivery pipeline. The temperature is 85℃, the pressure is 1.6MPa, and the hydrogen volumetric flow rate Q1 is 62.5m³ / h. 3 / h, the volumetric flow rate of the alkali solution Q2 is 25m³ / h. 3 / h.

[0074] The medium conveying pipeline provided in this embodiment includes a spiral twisted flange 21 arranged along the medium flow direction, a first connecting flange 3, a second connecting flange 4, and a pipeline body 1. The spiral twisted flange 21 is located inside the pipeline body 1, and the spiral twisted flange 21 is fixed to the end of the pipeline body 1 by welding. Of course, flange connections or other methods can also be used; these are not limiting. The first connecting flange 3 and the second connecting flange 4 are located at both ends of the pipeline body 1, respectively. The medium inlet 12 is located at the first connecting flange 3, and the medium outlet 13 is located at the second connecting flange 4.

[0075] In this embodiment, based on given process requirements, the structural parameters of the medium conveying pipeline can be designed according to the formulas and / or parameter ranges provided by the present invention. To illustrate the effective vibration reduction effect of the present invention in detail, this embodiment compares the changes in the flow field inside the pipe with and without the helical twisting vane 21.

[0076] In the comparative example, no spiral twisting vane 21 was installed inside the pipe. Figure 5 This is a cloud map showing the gas-liquid two-phase flow distribution in a vertical pipe without the spiral twist vane 21. From... Figure 5 It can be seen that from the pipe inlet to 500mm, the bubbles gradually develop and converge to form smaller bullet-shaped bubbles; continuous small bullet-shaped bubbles appear at 500-1000mm, and then the bubbles gather at the upper end to form larger bullet-shaped bubbles, forming an obvious bullet-shaped flow inside the pipe, and an obvious gas plug slug flow appears at the end of the pipe 500mm.

[0077] like Figure 6 As shown, for the medium conveying pipeline in this embodiment, a spiral twisting plate 21 is provided inside the pipeline body 1. Calculations show that... Figure 6 The diagram shows the flow pattern changes inside pipe body 1. From... Figure 6 As can be seen, under the action of centrifugal force, the liquid phase, with its higher density, is thrown closer to the pipe wall, while the gas phase gathers in the center to form a gas core. The flow pattern is regular, with both phases exhibiting a swirling flow, resulting in relatively stable flow and effectively avoiding slug flow phenomena. This indicates that the medium flowing within the pipe body 1 equipped with the spiral twisting vane 21 will not generate vibrations caused by slug flow and plug flow, thus well meeting engineering requirements and significantly reducing vibration. Furthermore, as the flow velocity increases, the centrifugal force increases, further enhancing the vibration damping effect of the vibration damper. This demonstrates that the medium conveying pipeline of this embodiment has good stability and minimal dependence on flow rate, offering a wide range of applications in practical engineering and exhibiting significant practical advantages.

[0078] It can be seen that the medium conveying pipeline provided by the present invention changes the two-phase flow pattern from the perspective of the fluid flow state inside the pipe, prevents the formation of slug flow and block flow, solves the problem of vibration generated by two-phase flow from the inside of the fluid, and increases the service life of the pipeline body 1.

[0079] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0080] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features of the invention described herein.

Claims

1. A medium conveying pipeline, characterized in that, include: The pipe body (1) has a medium flow channel (11) inside. The two ends of the pipe body (1) are respectively provided with a medium inlet (12) and a medium outlet (13) communicating with the medium flow channel (11). A flow guide (2) is disposed in the medium flow channel (11). The flow guide (2) can guide the flow path of the medium flowing into the medium flow channel (11) and separate the gas phase and liquid phase of the medium conveyed along the flow path, and the gas phase and the liquid phase flow out of the medium outlet (13) together.

2. The medium conveying pipeline according to claim 1, characterized in that, The flow guide (2) includes at least one spiral twisted piece (21) disposed in the medium flow channel (11), the outer periphery of the spiral twisted piece (21) and the inner wall of the pipe body (1) forming the flow path, and the flow path is spiral.

3. The medium conveying pipeline according to claim 2, characterized in that, There are multiple spiral twisted pieces (21), and the multiple spiral twisted pieces (21) are spaced apart along the extension direction of the pipe body (1).

4. The medium conveying pipeline according to claim 2, characterized in that, There is one spiral twisted piece (21), and the length of the spiral twisted piece (21) matches the length of the pipe body (1).

5. The medium conveying pipeline according to claim 2, characterized in that, The axis of the spiral twisting plate (21) coincides with the axis of the pipe body (1).

6. The medium conveying pipeline according to claim 2, characterized in that, The pitch of the spiral twisted plate (21) is P, and the diameter of the pipe body (1) is D, wherein 0.5D < P < 2D.

7. The medium conveying pipeline according to claim 2, characterized in that, The helical twisted plate (21) has multiple pitches that are the same or different.

8. The medium conveying pipeline according to claim 2, characterized in that, The pipe body (1) is provided with a first connecting flange (3) and a second connecting flange (4) at both ends.

9. The medium conveying pipeline according to claim 8, characterized in that, The distance between the end of the pipe body (1) and the first connecting flange (3) is h, and the diameter of the pipe body (1) is D, wherein 0.6D < Δh < 2D; And / or, the distance between the end of the pipe body (1) and the second connecting flange (4) is h, and the diameter of the pipe body (1) is D, wherein 0.6D < Δh < 2D.

10. The medium conveying pipeline according to any one of claims 1 to 9, characterized in that, The pipe body (1) is in the shape of a straight pipe or a curved pipe.

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