Coaxial spinning nozzle

Abstract

The utility model discloses a coaxial spinning nozzle which comprises an inner nozzle and an outer nozzle which are coaxially arranged, and the outer nozzle is arranged on the outer side of the inner nozzle in a surrounding mode. The inner spray head comprises a first shell, a first flow channel is formed in the first shell, and the first shell comprises a vertical part and a first arc-shaped part; the outer spray head comprises a second shell and a liquid inlet pipe, the second shell comprises a connecting part and a second arc-shaped part, the connecting part is connected with the outer wall of the vertical part, and an arc-shaped flow channel is formed between the inner wall of the second arc-shaped part and the outer wall of the first arc-shaped part; one end of the liquid inlet pipe penetrates through the second arc-shaped part to be communicated with the arc-shaped flow channel, the inner diameter of the liquid inlet pipe is gradually increased in the direction towards the arc-shaped flow channel, the arc-shaped flow channel is formed between the first arc-shaped part of the inner spray head and the second arc-shaped part of the outer spray head, and a spinning solution can flow more smoothly; and fluid impact and blockage possibly caused by a right-angle or acute-angle flow channel are avoided. Due to the design of the arc-shaped flow channel, resistance borne by the spinning solution in the flowing process is reduced, and therefore the risk of blocking is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of spinning nozzles, in particular to a coaxial spinning nozzle. Background Art

[0002] A coaxial spinning jet, also called a coaxial nozzle, is a special spinning device. It can contain two different coaxial electrospinning solutions. The core solution is pumped through the needle, while the sheath solution is pumped through the space between the nozzle and the needle. This design allows coaxial electrospinning to create complex fibers with a hollow interior.

[0003] The existing coaxial spinning nozzle structure includes a central nozzle and a peripheral nozzle. The central nozzle is responsible for spraying the core solution, and the peripheral nozzle is responsible for spraying the sheath solution. The two form a coaxial structure at the nozzle outlet, and then the filament is ejected through the capillary needle.

[0004] During the spinning process of a coaxial spinning nozzle with needle-type filament outlet, the flow rate of the spinning solution is also limited due to the small diameter of the spinneret hole, which may cause the solution to be easily blocked at the corners of the nozzle. The corner refers to the curved part before the spinning solution enters the spinneret hole from the nozzle body. Since the flow channel at the corner suddenly narrows and there is a turning of the fluid, it is easy for the spinning solution to generate turbulence, eddy currents or slow down the flow rate at the corner, increasing the risk of blockage. Utility Model Content

[0005] In order to reduce the risk of the spinning solution being blocked at the corner of the nozzle in the prior art, the utility model provides a coaxial spinning nozzle.

[0006] The technical solution adopted by the utility model is:

[0007] A coaxial spinning nozzle, comprising: an inner nozzle and an outer nozzle arranged coaxially, wherein the outer nozzle is arranged around the outer side of the inner nozzle;

[0008] The inner nozzle comprises a first shell, a first flow channel is provided in the first shell, and the first shell comprises a vertical portion and a first arc portion;

[0009] The external spray head comprises a second shell and a liquid inlet pipe, the second shell comprises a connecting portion and a second arc-shaped portion, the connecting portion is connected to the outer wall of the vertical portion, and an arc-shaped flow channel is formed between the inner wall of the second arc-shaped portion and the outer wall of the first arc-shaped portion;

[0010] One end of the liquid inlet pipe is penetrated by the second arc portion and communicated with the arc-shaped flow channel, and the inner diameter of the liquid inlet pipe gradually increases in the direction toward the arc-shaped flow channel.

[0011] Preferably, the first arc-shaped portion comprises a first arc-shaped surface and a second arc-shaped surface connected in sequence, and the first arc-shaped surface and the second arc-shaped surface have opposite bending directions;

[0012] The second arc-shaped portion includes a third arc-shaped surface and a fourth arc-shaped surface which are connected in sequence, and the third arc-shaped surface and the fourth arc-shaped surface have opposite bending directions.

[0013] Preferably, the curvature of the first arcuate surface is greater than the curvature of the third arcuate surface, and the curvature of the second arcuate surface is greater than the curvature of the fourth arcuate surface.

[0014] Preferably, a first sub-arc flow channel is formed between the first arc surface and the third arc surface, a second sub-arc flow channel is formed between the second arc surface and the fourth arc surface, and the first sub-arc flow channel is smoothly connected to the second sub-arc flow channel; the cross-sectional area of ​​the first sub-arc flow channel is greater than the cross-sectional area of ​​the second sub-arc flow channel.

[0015] Preferably, the cross-sectional area of ​​the first sub-arc-shaped flow channel gradually decreases in a direction approaching the second sub-arc-shaped flow channel.

[0016] Preferably, the second sub-arc-shaped flow channel gradually decreases in a direction away from the first sub-arc-shaped flow channel.

[0017] Preferably, the external nozzle also includes a second liquid outlet end, a groove is arranged on the second liquid outlet end, a liner is arranged in the second liquid outlet end, the top end of the liner is adapted to the groove, and the bottom end of the liner passes through the second liquid outlet end and extends.

[0018] Preferably, the liner is a T-shaped tube with a hollow cavity.

[0019] The beneficial effects of the utility model include at least one of the following: by forming an arc-shaped flow channel between the first arc-shaped portion of the inner nozzle and the second arc-shaped portion of the outer nozzle, the spinning solution can flow more smoothly, avoiding fluid impact and blockage that may be caused by right-angle or sharp-angle flow channels. The design of the arc-shaped flow channel reduces the resistance encountered by the spinning solution during the flow process, thereby reducing the risk of blockage.

[0020] The inner diameter of the liquid inlet pipe gradually increases toward the curved flow channel. This design allows the spinning solution to accelerate before entering the curved flow channel, forming a certain flow momentum. This flow momentum helps the spinning solution to pass through the curved flow channel better, reducing the possibility of eddy currents or stagnation at corners, thereby reducing the risk of blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front cross-sectional view of the first embodiment of the utility model;

[0022] Figure 2 It is a front cross-sectional view of the second embodiment of the utility model;

[0023] Figure 3 It is a front cross-sectional view of the third embodiment of the utility model;

[0024] Figure 4 It is a front cross-sectional view of the fourth embodiment of the utility model;

[0025] Figure 5 for Figure 4 A schematic diagram of the enlarged structure at A in the middle;

[0026] Figure 6 This is a front cross-sectional view of a nozzle with a liner in Embodiment 4 of the present utility model;

[0027] Figure 7 for Figure 6 Schematic diagram of the structure of point B and liner.

[0028] Figure numerals: 1. inner nozzle; 101. first shell; 102. first flow channel; 103. vertical portion; 104. first arc-shaped portion; 2. outer nozzle; 201. second shell; 202. liquid inlet pipe; 203. connecting portion; 204. second arc-shaped portion; 205. third arc-shaped surface; 206. fourth arc-shaped surface; 207. second liquid outlet; 208. groove; 3. arc-shaped flow channel; 301. first sub-arc-shaped flow channel; 302. second sub-arc-shaped flow channel; 4. liner. DETAILED DESCRIPTION

[0029] In order to make the purpose, scheme and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with embodiments and drawings. The schematic implementation manner of the utility model and its description are only used to explain the utility model and are not intended to limit the utility model.

[0030] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present invention. However, it is apparent to those skilled in the art that these specific details are not necessary to implement the present invention. In other embodiments, in order to avoid confusing the present invention, well-known structures, circuits, materials or methods are not specifically described.

[0031] Throughout the specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "one embodiment," "an embodiment," "an example," or "an example" appearing in various places throughout the specification do not necessarily all refer to the same embodiment or example. In addition, particular features, structures, or characteristics may be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. In addition, it will be appreciated by those of ordinary skill in the art that the figures provided herein are for illustrative purposes and that the figures are not necessarily drawn to scale. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0032] In the description of the present invention, the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the scope of protection of the present invention.

[0033] Embodiment 1: Figure 1 As shown, a coaxial spinning nozzle comprises: an inner nozzle 1 and an outer nozzle 2 which are coaxially arranged, and the outer nozzle 2 is arranged around the outer side of the inner nozzle 1.

[0034] For reference, the spinning nozzle adopts a coaxial design, the inner nozzle 1 is located at the center of the spinning nozzle, and the outer nozzle 2 surrounds the outside of the inner nozzle 1 to form a coaxial structure. This design helps to achieve uniform distribution and mixing of the spinning solution and improve the stability of the spinning process.

[0035] The inner nozzle 1 includes a first shell 101 . A first flow channel 102 is defined in the first shell 101 . The first shell 101 includes a vertical portion 103 and a first arc portion 104 .

[0036] For reference, the first flow channel 102 is a channel through which the inner spinning solution flows, and is used to transport the inner spinning solution from the inlet to the outlet of the inner nozzle 1. The first housing 101 is composed of a vertical portion 103 and a first arc portion 104. The vertical portion 103 can be a cylinder, and the first arc portion 104 is formed by bending from the bottom end of the vertical portion 103. When the inner spinning solution flows through the first flow channel 102, it can flow along the bending direction of the first arc portion 104.

[0037] The external nozzle 2 includes a second shell 201 and a liquid inlet pipe 202. The second shell 201 includes a connecting portion 203 and a second arc-shaped portion 204. The connecting portion 203 is connected to the outer wall of the vertical portion 103. An arc-shaped flow channel 3 is formed between the inner wall of the second arc-shaped portion 204 and the outer wall of the first arc-shaped portion 104.

[0038] The second arc portion 204 is formed by bending from the bottom end of the connecting portion 203, corresponding to the first arc portion 104. An arc flow channel is formed between the inner wall of the second arc portion 204 and the outer wall of the first arc portion 104, for guiding the flow of the external spinning solution. In the arc flow channel formed between the first arc portion 104 and the second arc portion 204, the spinning solution is subjected to the centrifugal force, thereby achieving uniform distribution and mixing of the spinning solution. At the same time, the design of the arc flow channel also helps to reduce the possibility of eddy currents or stagnation of the spinning solution at the corners, reducing the risk of blockage.

[0039] For reference, the connecting portion 203 and the vertical portion 103 may be connected by welding, which can ensure that the connection between the two components is leak-free and can withstand higher pressures and temperatures.

[0040] One end of the liquid inlet pipe 202 passes through the second arc portion 204 and is in communication with the arc-shaped flow channel 3 . The inner diameter of the liquid inlet pipe 202 gradually increases in a direction toward the arc-shaped flow channel 3 .

[0041] For reference, the liquid inlet pipe 202 can be a hollow tubular structure, and its material can be metal or other materials suitable for fluid transmission. The open end of the liquid inlet pipe 202 passes through the second arc-shaped portion 204 and is connected to the arc-shaped flow channel 3. In order to ensure that the spinning solution can flow smoothly into the arc-shaped flow channel 3, the open end of the liquid inlet pipe 202 can be designed to be a cone or trumpet shape that matches the shape and size of the arc-shaped flow channel 3. In this way, when the spinning solution enters the arc-shaped flow channel 3, the speed and direction of the fluid can be better controlled, reducing fluid impact and turbulence, and further reducing the risk of blockage.

[0042] Embodiment 2: Based on Embodiment 1, Figure 2 As shown, the first arc portion 104 includes a first arc surface 105 and a second arc surface 106 which are connected in sequence, and the first arc surface 105 and the second arc surface 106 have opposite bending directions.

[0043] It should be noted that the first curved surface 105 and the second curved surface 106 smoothly transition at the connection to form a continuous S-shaped structure. Specifically, the first curved surface 105 starts to bend from a point and extends in one direction, while the second curved surface 106 starts to bend in the opposite direction from the point connected to the previous curved surface.

[0044] The second arcuate portion 204 includes a third arcuate surface 205 and a fourth arcuate surface 206 connected in sequence; the third arcuate surface 205 and the fourth arcuate surface 206 have opposite bending directions. It should be noted that the third arcuate surface 205 and the fourth arcuate surface 206 have a smooth transition at the connection to form a continuous S-shaped structure. Specifically, the third arcuate surface 205 starts to bend from a point and extends in one direction, while the fourth arcuate surface 206 starts to bend in the opposite direction from the point connected to the previous arcuate surface.

[0045] Optionally, the curvature of the first curved surface 105 is greater than the curvature of the third curved surface 205, and the curvature of the second curved surface 106 is greater than the curvature of the fourth curved surface 206. By adjusting the curvature of the curved surface, the properties of different spinning solutions and the requirements of the spinning process can be adapted. A larger curvature may be more suitable for processing a spinning solution with a higher viscosity or a faster flow rate, while a smaller curvature may be suitable for processing a spinning solution with a lower viscosity or a slower flow rate.

[0046] In this embodiment, by designing the first curved surface 105 and the second curved surface 106, and the third curved surface 205 and the fourth curved surface 206 in opposite bending directions, the spinning solution can be effectively buffered and diverted when flowing through these curved surfaces, avoiding the risk of blockage caused by sudden speed changes.

[0047] Embodiment 3: Based on the above embodiment, Figure 3 As shown, a first sub-arc flow channel 301 is formed between the first arc surface 105 and the third arc surface 205, and a second sub-arc flow channel 302 is formed between the second arc surface 106 and the fourth arc surface 206; the first sub-arc flow channel 301 and the second sub-arc flow channel 302 are smoothly connected; the cross-sectional area of ​​the first sub-arc flow channel 301 is greater than the cross-sectional area of ​​the second sub-arc flow channel 302.

[0048] Furthermore, the cross-sectional area of ​​the first sub-arc-shaped flow channel 301 gradually decreases in a direction approaching the second sub-arc-shaped flow channel 302 , and the cross-sectional area of ​​the second sub-arc-shaped flow channel 302 gradually decreases in a direction away from the first sub-arc-shaped flow channel 301 .

[0049] In this embodiment, the cross-sectional area of ​​the first sub-arc-shaped flow channel 301 is relatively large, and the external spinning solution will be buffered when flowing through here, and the flow rate will be reduced. Reduce the impact and turbulence of the fluid at the corner, thereby reducing the risk of blockage. The external spinning solution smoothly transitions from the first sub-arc-shaped flow channel 301 to the second sub-arc-shaped flow channel 302. Since the cross-sectional area of ​​the second sub-arc-shaped flow channel 302 is relatively small, the flow rate of the spinning solution here will increase. The external spinning solution can maintain a continuous and stable flow state when transitioning from one flow channel to another. This increase in flow rate helps the spinning solution to better adhere to the inner wall of the flow channel, reducing the risk of accumulation and blockage. This smooth transition reduces the disturbance and possible accumulation of the fluid at the corner, further reducing the possibility of blockage.

[0050] Embodiment 4: Considering that both the outer spinning solution and the inner spinning solution flow through the second liquid outlet 207, the outer spinning solution and the inner spinning solution may be deposited in the second liquid outlet 207, resulting in a complicated cleaning process after blockage and difficulty in cleaning.

[0051] Based on the above embodiments, Figure 4 and Figure 5 As shown, the outer nozzle 2 further includes a second liquid outlet 207, and a groove 208 is provided on the second liquid outlet 207. Figure 6 As shown, a liner tube 4 is disposed in the second liquid outlet end 207, the top end of the liner tube 4 is adapted to the groove 208, and the bottom end of the liner tube 4 passes through the second liquid outlet end 207 and extends, wherein, as shown Figure 7 As shown, the liner 4 is a T-shaped tube with a hollow cavity. The outer diameter of the top of the liner 4 is designed to be slightly smaller than the inner diameter of the groove 208, so that the liner can be tightly inserted into the groove and will not be unable to be installed due to excessive size. In order to enhance the sealing effect and prevent the external spinning solution and the internal spinning solution from flowing into the gap between the top of the liner 4 and the groove 208, an elastic sealing ring can be installed between the top of the liner 4 and the contact surface of the groove 208. The sealing ring is usually made of a chemically resistant and wear-resistant elastic material. A layer of sealant can also be applied between the top of the liner 4 and the contact surface of the groove 208.

[0052] In this embodiment, by setting the top end of the liner 4 in the groove 208 on the second liquid outlet end 207, the external spinning solution and the internal spinning solution will flow out through the liner 4 and will no longer contact the inner wall of the second liquid outlet end 207. When the liner 4 is blocked, the liner 4 can be taken out and cleaned.

[0053] The above-mentioned embodiments only express the specific implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.

Claims

1. A coaxial spinning nozzle, characterized in that: include: An inner nozzle (1) and an outer nozzle (2) are coaxially arranged, wherein the outer nozzle (2) is arranged around the outer side of the inner nozzle (1); The inner nozzle (1) comprises a first shell (101), a first flow channel (102) is provided in the first shell (101), and the first shell (101) comprises a vertical portion (103) and a first arc-shaped portion (104); The external spray head (2) comprises a second shell (201) and a liquid inlet pipe (202); the second shell (201) comprises a connecting portion (203) and a second arc-shaped portion (204); the connecting portion (203) is connected to the outer wall of the vertical portion (103); an arc-shaped flow channel (3) is formed between the inner wall of the second arc-shaped portion (204) and the outer wall of the first arc-shaped portion (104); One end of the liquid inlet pipe (202) is penetrated by the second arc-shaped portion (204) and communicates with the arc-shaped flow channel (3), and the inner diameter of the liquid inlet pipe (202) gradually increases in a direction toward the arc-shaped flow channel (3).

2. A coaxial spinning nozzle according to claim 1, characterized in that: include: The first arc-shaped portion (104) comprises a first arc-shaped surface (105) and a second arc-shaped surface (106) which are connected in sequence, and the first arc-shaped surface (105) and the second arc-shaped surface (106) have opposite bending directions; The second arc-shaped portion (204) comprises a third arc-shaped surface (205) and a fourth arc-shaped surface (206) which are connected in sequence; the third arc-shaped surface (205) and the fourth arc-shaped surface (206) have opposite bending directions.

3. A coaxial spinning nozzle according to claim 2, characterized in that: include: The curvature of the first curved surface (105) is greater than the curvature of the third curved surface (205), and the curvature of the second curved surface (106) is greater than the curvature of the fourth curved surface (206).

4. A coaxial spinning nozzle according to claim 2 or 3, characterized in that: include: A first sub-arc-shaped flow channel (301) is formed between the first arc-shaped surface (105) and the third arc-shaped surface (205), and a second sub-arc-shaped flow channel (302) is formed between the second arc-shaped surface (106) and the fourth arc-shaped surface (206); the first sub-arc-shaped flow channel (301) and the second sub-arc-shaped flow channel (302) are smoothly connected; and a cross-sectional area of ​​the first sub-arc-shaped flow channel (301) is greater than a cross-sectional area of ​​the second sub-arc-shaped flow channel (302).

5. A coaxial spinning nozzle according to claim 4, characterized in that: The cross-sectional area of ​​the first sub-arc-shaped flow channel (301) gradually decreases in a direction approaching the second sub-arc-shaped flow channel (302).

6. A coaxial spinning nozzle according to claim 4, characterized in that: The second sub-arc-shaped flow channel (302) gradually decreases in a direction away from the first sub-arc-shaped flow channel (301).

7. A coaxial spinning nozzle according to claim 1, characterized in that: The external nozzle (2) further comprises a second liquid outlet end (207), a groove (208) being arranged on the second liquid outlet end (207), a liner tube (4) being arranged inside the second liquid outlet end (207), the top end of the liner tube (4) being adapted to fit the groove (208), and the bottom end of the liner tube (4) passing through the second liquid outlet end (207) and extending.

8. A coaxial spinning nozzle according to claim 7, characterized in that: The liner tube (4) is a T-shaped tube with a hollow cavity.

Images