Melt jacket pipeline

Abstract

The utility model belongs to the technical field of spinning production line equipment, and discloses a melt jacketed pipeline which comprises a jacketed pipeline inner pipe and a jacketed pipeline outer pipe, and a flow guide baffle is arranged on the jacketed pipeline inner pipe; the diversion baffle is round steel which is spirally wound on the outer wall of the inner pipe of the jacketed pipeline; the distance between the jacket pipeline inner pipe and the jacket pipeline outer pipe is a, and the diameter of the round steel is smaller than a; or the flow guide baffles are semicircular flow guide baffles, and the number of the semicircular flow guide baffles is multiple; the plane where the semicircular flow guide baffles are located is perpendicular to the length direction of the inner pipe of the jacketed pipeline, the semicircular flow guide baffles are fixed to the outer wall of the inner pipe of the jacketed pipeline, and a gap is formed between any two adjacent semicircular flow guide baffles; projections of every two adjacent semi-annular flow guide baffles in the length direction of the jacketed pipeline inner pipe are combined into a circular ring. The flow speed of a heating medium can be increased, so that the heating medium flows uniformly and stably, and the melt is heated uniformly.

Description

Technical Field

[0001] This utility model belongs to the technical field of spinning production line equipment and relates to a melt jacket pipeline. Background Technology

[0002] In polyester production, stable melt temperature is a crucial factor in ensuring consistent quality. Currently, melt temperature stabilization is generally achieved through polyester melt pipeline heating, which is mostly implemented using jacketed pipelines. This allows the liquid heat medium to flow in the opposite direction to the melt within the jacket layer. As the inner pipe of the jacketed pipeline increases in size, the diameters of both the outer pipe and the jacket layer (the area between the inner and outer pipes) also increase. When the diameter of the jacket layer exceeds the diameter of the heat medium outlet, the flow velocity of the liquid heat medium within the jacketed pipeline decreases accordingly, and the Reynolds number of the liquid heat medium decreases until the flow state changes from turbulent to laminar. When the liquid heat medium is in a laminar flow state, the flow velocity of the heat medium near the pipe wall will decrease or even stop, resulting in uneven flow of the heat medium. Moreover, the heat transfer effect of laminar flow is lower than that of turbulent flow, which will further cause uneven heating of the melt and affect the stability of the final product quality.

[0003] Patent CN203614982U discloses a heating and insulation jacket tube, but this device only involves heating and insulation jacket tubes for polyacrylonitrile-based carbon fiber spinning dope, and cannot guarantee that the material in the inner tube is heated evenly.

[0004] Patent CN204752917U discloses a melt pipe for a spinning production line, but this device can only quickly detect the parts where non-condensable gases accumulate in the pipe and release the non-condensable gases in the heating layer, and it cannot guarantee that the material in the inner tube is heated evenly.

[0005] Therefore, a melt-jacketed pipeline is needed to solve the above problems, which is of great significance. Utility Model Content

[0006] The purpose of this invention is to solve the problems existing in the prior art and to provide a melt jacketed pipeline.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] A melt jacketed pipeline, comprising an inner jacketed pipeline and an outer jacketed pipeline, wherein a flow guide baffle is provided on the inner jacketed pipeline.

[0009] The flow guide baffle is made of round steel, which is spirally wound around the outer wall of the inner tube of the jacketed pipeline; let a be the distance between the inner tube and the outer tube of the jacketed pipeline, and let a be the diameter of the round steel.

[0010] A round steel bar was added to the inner tube of the jacketed pipeline. According to the principles of fluid mechanics, when the liquid heat medium flows in the jacket layer (the area between the inner and outer tubes of the jacketed pipeline) and encounters the guide baffle, it is subjected to resistance and shear force from the guide baffle due to inertia. The flow direction of the liquid heat medium is passively changed, and the liquid heat medium flows in a spiral shape along the spiral guide baffle, thereby increasing the flow velocity.

[0011] Alternatively, the flow guide baffle is a semi-circular annular flow guide baffle, and there are multiple semi-circular annular flow guide baffles; the semi-circular annular flow guide baffles are semi-circular annular; the plane on which the multiple semi-circular annular flow guide baffles are located is perpendicular to the length direction of the inner tube of the jacketed pipeline, the multiple semi-circular annular flow guide baffles are fixed on the outer wall of the inner tube of the jacketed pipeline, and there is a gap between any two adjacent semi-circular annular flow guide baffles; the projections of two adjacent semi-circular annular flow guide baffles along the length direction of the inner tube of the jacketed pipeline combine to form a ring; let a be the distance between the inner tube of the jacketed pipeline and the outer tube of the jacketed pipeline, the height of the semi-circular annular flow guide baffle is less than a, and the difference between a and a is 5 to 7 mm, and this difference is the expansion gap;

[0012] A semi-circular annular baffle was added to the inner pipe of the jacketed pipeline, reducing the cross-sectional area of ​​the jacket layer (the cross-sectional area of ​​the jacket layer refers to the cross-sectional area of ​​the region between the inner and outer pipes of the jacket). Since the flow velocity equals the flow rate divided by the cross-sectional area, this scheme reduces the jacket cross-sectional area by half through the semi-circular annular baffle, and the flow velocity of the heat medium will definitely increase accordingly. To prevent uneven flow, the flow channel of the heat medium is designed as a serpentine channel by arranging the semi-circular annular baffles. When the flow velocity of the heat medium increases, it collides with the semi-circular annular baffles and changes its flow direction, forming a turbulent flow pattern. Turbulence can make the flow of the heat medium more uniform. Because the semi-circular annular baffles are installed with one on top and one on the bottom, then another on top and another on the bottom, and so on (that is, the flow channel of the heat medium is designed as a serpentine channel), the liquid phase heat medium in the channel moves up and down repeatedly, exhibiting a wave-like flow (a small amount of heat medium flows from the expansion gap).

[0013] As a preferred technical solution:

[0014] As described above, in a melt jacketed pipeline, when the outer diameter of the inner tube of the jacketed pipeline is 80-250mm, the flow guide baffle is made of round steel; when the outer diameter of the inner tube of the jacketed pipeline is ≥300mm, the flow guide baffle is a semi-circular annular flow guide baffle; when the outer diameter of the inner tube of the jacketed pipeline is greater than 250mm and less than 300mm, the flow guide baffle can be either round steel or a semi-circular annular flow guide baffle.

[0015] When the outer diameter of the inner tube of the jacketed pipeline is ≥300mm, the flow velocity of the heat medium decreases due to the increased cross-section of the jacket, and the force of the fluid on the guide baffle also decreases. If round steel is used, it is best to increase the diameter of the round steel in order to increase the disturbance to the heat medium, but this will result in problems such as the round pipe being difficult to install and difficult to bend.

[0016] In the melt-jacketed pipeline described above, the diameter B of the round steel bar is 5mm.

[0017] In the melt-jacketed pipeline described above, when the round steel is spirally wound around the outer wall of the inner tube of the jacketed pipeline, the spiral spacing E is 1.5 times the outer diameter of the inner tube of the jacketed pipeline.

[0018] In the melt jacketed pipeline described above, the thickness F of the semi-circular annular flow guide baffle is 3mm.

[0019] As described above, in a melt jacketed pipeline, multiple semi-circular annular flow guide baffles are fixed at equal intervals on the outer wall of the inner tube of the jacketed pipeline, and the distance A between two adjacent semi-circular annular flow guide baffles is 200mm.

[0020] Beneficial effects:

[0021] This invention changes the flow pattern of the heat medium by adding a flow guide baffle on the outer wall of the inner tube of the jacketed pipeline, thereby increasing the flow velocity of the heat medium and making the flow of the heat medium more uniform and stable. As a result, the temperature of the melt inside the inner tube of the jacketed pipeline is also more uniform and stable. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the melt jacket pipeline when the guide baffle is made of round steel in this utility model; in the figure, B is the diameter of the round steel, C is the outer diameter of the inner tube of the jacket pipeline, E is the helical pitch, and the black arrow indicates the helical flow direction of the liquid phase heat medium.

[0023] Figure 2 This is a schematic diagram of the melt jacket pipeline when the flow guide baffle is a semi-circular annular flow guide baffle in this utility model; in the figure, A is the distance between two adjacent semi-circular annular flow guide baffles, F is the thickness of the semi-circular annular flow guide baffle, D is the outer diameter of the inner tube of the jacket, and the black arrow indicates the serpentine flow direction of the liquid phase heat medium.

[0024] Figure 3 This is a radial cross-sectional view of the melt jacket pipeline when the guide baffle is made of round steel in this utility model; in the figure, S is the difference between the height of the semi-circular annular guide baffle and a (the distance between the inner tube of the jacket pipeline and the outer tube of the jacket pipeline);

[0025] Figure 4 This is a schematic diagram of the semi-circular annular flow guide baffle of this utility model; in the figure, R1 is the radius of the inner tube of the jacket, and R2 is the radius of the inner tube of the jacket plus the thickness of the semi-circular annular flow guide baffle.

[0026] Among them, 1-liquid phase heat medium outlet, 2-outer pipe of jacketed pipeline, 3-inner pipe of jacketed pipeline, 4-round steel, 5-semi-circular annular guide baffle, 6-jacket layer. Detailed Implementation

[0027] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0028] Example 1

[0029] A melt-jacketed pipeline, such as Figure 1 , Figure 3 As shown, the melt jacketed pipeline includes an inner jacketed pipeline 3 and an outer jacketed pipeline 2;

[0030] A flow guide baffle is provided on the inner pipe 3 of the jacketed pipeline;

[0031] The outer diameter C of the inner tube 3 of the jacketed pipeline is 80-250mm, and the flow guide baffle is round steel 4 with a diameter B of 5mm; the round steel 4 is spirally wound on the outer wall of the inner tube 3 of the jacketed pipeline.

[0032] When the round steel bar 4 is spirally wound around the outer wall of the inner tube 3 of the jacketed pipeline, the spiral spacing E is 1.5 times the outer diameter of the inner tube 3 of the jacketed pipeline;

[0033] Let a be the distance between the inner pipe 3 and the outer pipe 2 of the jacketed pipeline, and let a be the diameter of the round steel 4 be less than a.

[0034] The process of using the above device is as follows: Figure 1 As shown, when the above-mentioned device is used to heat the melt, the liquid heat medium flowing in the jacket layer 6 will encounter the round steel 4 spirally wound on the outer wall of the inner tube 3 of the jacket pipeline. According to the principles of fluid mechanics and under the action of inertia, the liquid heat medium is subjected to resistance and shear force from the round steel 4. The flow direction of the liquid heat medium is passively changed, and the liquid heat medium flows in a spiral shape along the spiral round steel 4, thereby increasing the flow velocity, and finally flows out from the liquid heat medium outlet 1.

[0035] Example 2

[0036] A melt-jacketed pipeline, such as Figure 2 As shown, the melt jacketed pipeline includes an inner jacketed pipeline 3 and an outer jacketed pipeline 2;

[0037] A flow guide baffle is provided on the inner pipe 3 of the jacketed pipeline;

[0038] The outer diameter D of the inner tube 3 of the jacketed pipeline is ≥300mm, and the flow guide baffle is a semi-circular annular flow guide baffle 5. The semi-circular annular flow guide baffle 5 is semi-circular; there are multiple semi-circular annular flow guide baffles 5.

[0039] like Figure 4 As shown, the radius of the inner tube of the jacket is R1, and the radius of the inner tube plus the thickness of the semi-circular annular guide baffle is R2.

[0040] The thickness F of the semi-circular annular flow guide baffle 5 is 3mm; the plane on which multiple semi-circular annular flow guide baffles 5 are located is perpendicular to the length direction of the inner tube 3 of the jacketed pipeline, and multiple semi-circular annular flow guide baffles 5 are fixed at equal intervals on the outer wall of the inner tube 3 of the jacketed pipeline, and the distance A between two adjacent semi-circular annular flow guide baffles 5 is 200mm; the projections of two adjacent semi-circular annular flow guide baffles 5 along the length direction of the inner tube 3 of the jacketed pipeline are combined to form a ring; let a be the distance between the inner tube 3 of the jacketed pipeline and the outer tube 2 of the jacketed pipeline, and let a be the height of the semi-circular annular flow guide baffle 5 be less than a, and the difference S between a and a is 5~7mm;

[0041] The process of using the above device is as follows: Figure 2 As shown, when the above-mentioned device is used to heat the melt, the liquid heat medium flowing in the jacket layer 6 will encounter semi-circular annular flow guide baffles 5 arranged at the same interval on the outer wall of the inner tube 3 of the jacket pipeline. Since the distance between the inner tube 3 and the outer tube 2 of the jacket pipeline is reduced by the semi-circular annular flow guide baffles 5, the flow velocity of the heat medium will increase accordingly, and under the action of multiple semi-circular annular flow guide baffles 5, it will flow in a wave-like manner and finally flow out from the liquid heat medium outlet 1.

Claims

1. A melt-jacketed pipeline, comprising an inner jacketed pipeline and an outer jacketed pipeline, characterized in that, The inner tube of the jacketed pipeline is equipped with a flow guide baffle; The flow guide baffle is made of round steel, which is spirally wound around the outer wall of the inner tube of the jacketed pipeline; let a be the distance between the inner tube and the outer tube of the jacketed pipeline, and let a be the diameter of the round steel. Alternatively, the flow guide baffle is a semi-circular annular flow guide baffle (5), and there are multiple semi-circular annular flow guide baffles (5); the plane on which the multiple semi-circular annular flow guide baffles (5) are located is perpendicular to the length direction of the inner tube of the jacketed pipeline, the multiple semi-circular annular flow guide baffles (5) are fixed on the outer wall of the inner tube of the jacketed pipeline, and there is a gap between any two adjacent semi-circular annular flow guide baffles (5); the projections of two adjacent semi-circular annular flow guide baffles (5) along the length direction of the inner tube of the jacketed pipeline are combined to form a ring; let the distance between the inner tube of the jacketed pipeline and the outer tube of the jacketed pipeline be a, the height of the semi-circular annular flow guide baffle (5) is less than a, and the difference between it and a is 5 to 7 mm.

2. The melt-jacketed pipeline according to claim 1, characterized in that, When the outer diameter of the inner tube of the jacketed pipeline is 80-250mm, the flow guide baffle is round steel; when the outer diameter of the inner tube of the jacketed pipeline is ≥300mm, the flow guide baffle is a semi-circular annular flow guide baffle (5).

3. A melt-jacketed pipeline according to claim 2, characterized in that, The diameter B of the round steel bar is 5mm.

4. A melt-jacketed pipeline according to claim 3, characterized in that, When the round steel spiral is wound around the outer wall of the inner tube of the jacketed pipeline, the spiral spacing E is 1.5 times the outer diameter of the inner tube of the jacketed pipeline.

5. A melt-jacketed pipeline according to claim 4, characterized in that, The thickness F of the semi-circular annular guide baffle (5) is 3mm.

6. A melt-jacketed pipeline according to claim 5, characterized in that, Multiple semi-circular annular flow guide baffles (5) are fixed at equal intervals on the outer wall of the inner tube of the jacketed pipeline, and the distance A between two adjacent semi-circular annular flow guide baffles (5) is 200mm.

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