Flash spinning critical state stabilizing device and flash spinning equipment

Abstract

The present application relates to the technical field of non-woven fabric manufacturing, and in particular to a flash spinning critical state stabilization device and a flash spinning equipment. A decompression chamber is provided inside the flash spinning critical state stabilization device; a decompression device is provided at one end of the decompression chamber, and a decompression port connected to the decompression chamber is provided on the decompression device, and a spinneret connected to the decompression chamber is provided at the other end of the decompression chamber, so that the spinning solution enters through the decompression port of the decompression device, flows through the decompression chamber, and is ejected from the spinneret; a heating device is provided in the decompression chamber to heat the spinning solution flowing through the decompression chamber. The flash spinning critical state stabilization device heats the decompression chamber by arranging a heating device, and can control the temperature of the decompression chamber, reduce the temperature difference of the spinning solution at the inlet and outlet of the decompression chamber and in the decompression chamber, and reduce the production fluctuation of the temperature of the decompression chamber, so that the spinning solution has good stability in the critical state of flash spinning, thereby ensuring the production quality of the fiber.

Description

Technical Field

[0001] The present application relates to the technical field of flash spinning manufacturing equipment, and in particular to a flash spinning critical state stabilization device and a flash spinning equipment. Background Art

[0002] The principle of flash spinning is: a polymer solution (i.e., spinning solution) under high temperature and high pressure conditions is released through a spinneret into an environment at normal temperature and pressure, and the low boiling point solvent is rapidly vaporized and evaporates instantly, while the polymer is rapidly solidified from a liquid state and is stretched by high-speed solvent gas to form fibers. In the existing flash spinning process, the high temperature and high pressure spinning solution needs to reach a critical state before spinning. The traditional method is to allow the spinning solution to flow into a decompression chamber through a decompression plate (i.e., a decompression plate) to reduce pressure, forming a two-phase solution (i.e., a critical state), and then ejected through the spinneret.

[0003] The preparation method of flash-spun ultrafine fibers is: dissolving the fiber-forming polymer in a suitable solvent under high temperature and high pressure to obtain a spinning solution, wherein the solvent cannot dissolve the polymer when it is equal to or lower than its normal boiling point. During spinning, the spinning solution is passed through an extruder through a spinneret and reduced to normal pressure. Due to the sudden decrease in pressure, the solvent evaporates rapidly, causing the polymer to be highly fibrillated and become ultrafine fiber filaments. A specific method of flash-spinning ultrafine fibers disclosed in the prior art is:

[0004] The spinning solution is prepared under high temperature and high pressure to form a spinning solution, which is then sent to the feed pipe and then sent to the decompression chamber through the decompression throttle hole. When entering the decompression chamber, the polymer and the solvent are phase separated due to the pressure reduction, but in order to prevent the solvent from vaporizing, the pressure of the decompression chamber must be strictly controlled. The spinning solution after phase separation is then decompressed and ejected from the trapezoidal spinning nozzle at low temperature and low pressure. At this time, the solvent expands violently and flash vaporizes, the temperature decreases, and the polymer is stretched and solidified by the steam flow at a high multiple, and is separated by the electrostatic field to form a three-dimensional network of ultra-fine fiber mesh plexifilaments.

[0005] like Figure 1 As shown, the above existing flash spinning ultrafine fiber preparation technology has the following defects:

[0006] (1) It usually uses a fixed pressure reducing plate, so that the high temperature and high pressure spinning solution enters the pressure reducing chamber through the pressure reducing hole of the pressure reducing plate. The pressure reducing plate is a plate with a fixed size to play a pressure reducing role. Different plate hole sizes have different pressure reducing effects. Because the aperture of the pressure reducing hole is fixed, it is necessary to stop the machine and replace the pressure reducing plate according to different production needs, which greatly affects the production efficiency. The flexibility and applicability of the device are poor and it is inconvenient to use;

[0007] (2) During the process of the violent expansion and flash vaporization of the spinning solution, the solvent needs to absorb a large amount of heat. At this time, part of the heat absorbed by the solvent comes from the decompression chamber, which will cause the temperature in the decompression chamber to change, resulting in inconsistent temperatures of the spinning solution at the entrance and exit of the decompression chamber and in the decompression chamber. Such production fluctuations in the temperature of the decompression chamber are likely to affect the critical state of the spinning solution during flash spinning. Figure 1 As shown, the existing flash spinning device does not have corresponding structures and components to solve the problem of temperature fluctuation in the decompression chamber. Summary of the invention

[0008] In order to solve the deficiencies of the prior art mentioned in the above background technology, the present application provides a flash spinning critical state stabilization device, and its technical solution is as follows:

[0009] The flash spinning critical state stabilization device has a decompression chamber inside. A decompression device is provided at one end of the decompression chamber, and a decompression port connected to the decompression chamber is provided on the decompression device, and a spinneret connected to the decompression chamber is provided at the other end of the decompression chamber, so that the spinning solution enters from the decompression port of the decompression device, flows through the decompression chamber, and is ejected from the spinneret. A heating device is provided in the decompression chamber to heat the spinning solution flowing through the decompression chamber.

[0010] In one embodiment, the heating device comprises a heating tube. The heating tube is arranged in the decompression chamber for heating the spinning solution. The heating tube is a spiral coil-shaped tubular structure, which extends along the forward direction of the spinning solution and is arranged in a spiral shape.

[0011] In one embodiment, the spiral radius of the heating tube gradually increases along the advancing direction of the spinning solution.

[0012] In one embodiment, along the advancing direction of the spinning solution, the spiral radius of the heating tube increases linearly, and the distances between adjacent spiral coils of the heating tube are equal.

[0013] In one embodiment, the heating device further comprises a heater for heating the temperature control medium. The heating tube is a heat exchange tube, which serves as a channel for the temperature control medium to flow, and its inlet end and outlet end are respectively connected to the heater, so that the temperature control medium enters from the inlet end after being heated by the heater, flows through the heat exchange tube, and then flows back to the heater from the outlet end, the inlet end is located at one end close to the spinneret, and the outlet end is located at the other end close to the pressure reducing port.

[0014] In one embodiment, the decompression chamber includes a first chamber and a second chamber which are connected in sequence, so that the spinning solution enters from the decompression port, flows through the first chamber and the second chamber in sequence, and is ejected from the spinneret. Along the direction in which the spinning solution moves, the cross-sectional width of the first chamber gradually increases, and the cross-sectional width of the second chamber remains unchanged.

[0015] In one embodiment, the heating device is located in the first chamber to heat the spinning solution flowing through the first chamber.

[0016] In one embodiment, the first chamber is a truncated cone-shaped chamber, and the cross section of the first chamber is a trapezoidal cross section. Along the forward direction of the spinning solution, the spiral radius of the heating tube increases linearly, and the outermost edge of the spiral coil with the smallest spiral radius of the heating tube is connected to the outermost edge of the spiral coil with the largest spiral radius to form a straight line, and the straight line is parallel to the waistline of the trapezoidal cross section close to it.

[0017] In one embodiment, a temperature sensor, a pressure sensor and a control system are also included. The temperature sensor and the pressure sensor are arranged in the decompression chamber to detect the temperature and pressure in the decompression chamber. The decompression device is a valve, and the temperature sensor, the pressure sensor, the heating device and the valve are all electrically connected to the control system.

[0018] The present application also provides a flash spinning device, which includes the above-mentioned flash spinning critical state stabilizing device.

[0019] Based on the above, compared with the prior art, the flash spinning critical state stabilization device and flash spinning equipment provided by the present application have the following beneficial effects:

[0020] The present application heats the decompression chamber by arranging a heating device, thereby controlling the temperature of the decompression chamber, reducing the temperature difference between the spinning solution at the inlet and outlet of the decompression chamber and inside the decompression chamber, and reducing the production fluctuation of the temperature of the decompression chamber, so that the spinning solution has good stability in the critical state of flash spinning, thereby ensuring the production quality of the fiber.

[0021] Other features and beneficial effects of the present application will be described in the subsequent description, and partly become apparent from the description, or understood by practicing the present application. The purpose and other beneficial effects of the present application can be realized and obtained by the structures specifically pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings without creative work. The positional relationships described in the drawings in the following description are based on the directions of the components in the drawings unless otherwise specified.

[0023] Figure 1 It is a schematic diagram of the cross-sectional structure of an existing conventional flash spinning device.

[0024] Figure 2 This is a schematic diagram of the cross-sectional structure of the flash spinning critical state stabilization device provided in Example 1 of the present application.

[0025] Figure 3 This is a schematic diagram of the cross-sectional structure of the flash spinning critical state stabilization device provided in Example 2 of the present application.

[0026] Figure 4 A side view of the heating device provided in Example 2 of the present application.

[0027] Figure 5 A schematic cross-sectional structure diagram of a flash spinning critical state stabilization device provided in Example 3 of the present application;

[0028] Figure 6 This is a control framework diagram of the control system of the flash spinning critical state stabilization device provided in Examples 1-3 of the present application.

[0029] Reference numerals:

[0030] 100 Flash spinning critical state 11 Decompression chamber 12 Transfer chamber

[0031] Stabilizer

[0032] 13 pressure reducing device 14 heating device 15 temperature sensor

[0033] 16 Pressure sensor 17 Control system

[0034] 111 spinneret 112 first chamber 113 second chamber

[0035] 131 Pressure reducing port 142 Heater 141 Heating tube

[0036] 1411 First straight line 1412 Second straight line 1413 Import end

[0037] 1414 exit 1122 second waistline 1121 first waistline DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. The technical features designed in the different implementation modes of the present application described below can be combined with each other as long as they do not conflict with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0039] In the description of this application, it should be noted that all terms (including technical terms and scientific terms) used in this application have the same meaning as those commonly understood by ordinary technicians in the field to which this application belongs, and cannot be understood as limiting this application. It should be further understood that the terms used in this application should be understood to have the same meaning as the meaning of these terms in the context of this specification and the relevant field, and should not be understood in an idealized or overly formal sense, unless explicitly defined in this application.

[0040] This application provides a Figure 2 Embodiment 1, Figure 3-4 Embodiment 2, Figure 5 The flash spinning critical state stabilization device 100 shown in Example 3, wherein: Figure 6 This is a control framework diagram of the control system 17 of the flash spinning critical state stabilization device 100 provided in Examples 1-3. The specific scheme of the flash spinning critical state stabilization device 100 is as follows:

[0041] A decompression chamber 11 is provided inside the flash spinning critical state stabilization device 100. A decompression device 13 is provided at one end of the decompression chamber 11, and a decompression port 131 communicating with the decompression chamber 11 is provided on the decompression device 13, and a spinneret 111 communicating with the decompression chamber 11 is provided at the other end of the decompression chamber 11, so that the spinning solution enters from the decompression port 131 of the decompression device 13, flows through the decompression chamber 11, and is ejected from the spinneret 111. A heating device 14 is provided inside the decompression chamber 11 to heat the spinning solution flowing through the decompression chamber 11.

[0042] like Figure 2 Embodiment 1, Figure 3-4 Embodiment 2, Figure 5As shown in Example 3, the present application sets a heating device 14 in the decompression chamber 11 to heat the spinning solution flowing through the decompression chamber 11. When in use, the spinning solution in a high temperature and high pressure state enters the decompression chamber 11 through the decompression port 131. Due to the pressure reduction, the polymer and the solvent are phase separated, and the spinning solution after phase separation is ejected through the spinneret 111. At this time, the solvent in the spinning solution expands violently and flash vaporizes, and needs to absorb a large amount of heat from the decompression chamber 11, resulting in inconsistent temperatures of the spinning solution at the inlet and outlet of the decompression chamber 11 (i.e., the decompression port 131 and the spinneret 111) and in the decompression chamber 11. Such production fluctuations in the temperature of the decompression chamber 11 are likely to affect the critical state of the spinning solution in flash spinning, which has an adverse effect on the production quality of the fiber. The present application heats the decompression chamber 11 by setting a heating device 14, so as to control the temperature of the decompression chamber 11, reduce the temperature difference between the inlet and outlet of the decompression chamber 11 (i.e., the decompression port 131 and the spinneret 111) and the spinning solution in the decompression chamber 11, reduce the production fluctuation of the temperature of the decompression chamber 11, and realize the refined control of the temperature of the device, so that the spinning solution has good stability in the critical state of flash spinning, thereby ensuring the production quality of the fiber.

[0043] Preferably, if Figure 2 Embodiment 1, Figure 3-4 Embodiment 2, Figure 5 As shown in Example 3, the heating device 14 includes a heating tube 141. The heating tube 141 is arranged in the decompression chamber 11 for heating the spinning solution. The heating tube 141 is a spiral coil-shaped tubular structure, which extends along the advancing direction of the spinning solution from the decompression port 131 to the spinneret 111 and is arranged in a spiral shape.

[0044] Such arrangement, on the one hand, increases the contact area between the heating tube 141 and the spinning solution in the decompression chamber 11, and on the other hand, such a structural design of the heating tube 141 can hinder the parallel flow of the spinning solution, allowing the spinning solution to better enter a turbulent state, increase the uniformity of the spinning solution temperature, and better achieve temperature control.

[0045] Preferably, the spiral radius of the heating tube 141 gradually increases along the advancing direction of the spinning solution, that is, from the decompression port 131 to the spinneret 111. Further preferably, along the advancing direction of the spinning solution, the spiral radius of the heating tube 141 increases linearly. The distances between adjacent spiral coils of the heating tube 141 are equal.

[0046] like Figure 3-4 Embodiment 2, Figure 5As shown in Example 3, the spiral radius of the heating tube 141 is gradually increased along the forward direction of the spinning solution. Since the temperature difference between the spinning solution in the decompression chamber 11 at the solution inlet (i.e., the decompression port 131) and the spinneret 111 is the largest, the temperature at the decompression port 131 is higher than that at the spinneret 111 (the solvent evaporates and takes away a large amount of heat). Therefore, the closer the spiral radius of the heating tube 141 is to the spinneret 111, the larger the overall length of the heating tube 141 at that location can be increased, and the heat exchange area of ​​the heating tube 141 at that location can be increased, which helps to improve the heating efficiency and enhance the heating of that location, so that the lower the temperature in the decompression chamber 11, the stronger the heating of the heating tube 141, the more uniform the overall temperature in the decompression chamber 11, and further avoid the excessive temperature difference from affecting the spinning quality.

[0047] The above-mentioned heating device 14 and heating tube 141 are existing devices. Examples 1-3 of the present application provide the following preferred implementations:

[0048] The heating device 14 is selected from Figure 2 The electric heating tube 141 device shown in Example 1 is specifically a double-headed heating tube 141 device, with a stainless steel metal tube as a protective shell, and high-quality electric heating alloy wires (i.e., the above-mentioned heating tube 141) are uniformly spirally arranged along the central axis of the tube, and the pipes compounded or assembled in the area outside the decompression chamber 11 are all non-heating areas, wherein the outer diameter range of the selected electric heating tube is Φ6.6-Φ16. The inventor has found through research that the use of the electric heating tube 141 to heat the spinning solution is more efficient (relative to the exchange pipe using the temperature control medium).

[0049] In addition, the heating device 14 can also be selected from Figure 3-4 Embodiment 2, Figure 5 The heat exchanger shown in Example 3 uses a heating device 14 including a heating tube 141 and a heater 142 for heating a temperature control medium. The heating tube 141 is a heat exchange tube, which serves as a channel for the temperature control medium to flow, and its inlet end 1413 and outlet end 1414 are respectively connected to the heater 142, so that the temperature control medium is heated by the heater 142, enters from the inlet end 1413, flows through the heat exchange tube, and then flows back to the heater 142 from the outlet end 1414. More preferably, the temperature control medium is a gas.

[0050] When in use, the exchange tube is filled with a temperature control medium (e.g., a temperature control medium (e.g., a temperature control gas)). By controlling the flow rate and temperature of the temperature control medium, the temperature control medium circulates in the exchange tube and the heater 142 and exchanges heat with the spinning solution, thereby controlling the temperature of the spinning solution in the decompression chamber 11.

[0051] In addition, the solution of using a heat exchanger for the heating device 14 is further optimized: Figure 3-4 Embodiment 2, Figure 5As shown in Example 3, the inlet end 1413 is designed to be located at one end close to the spinneret 111, and the outlet end 1414 is located at the other end close to the pressure reducing port 131, so that the flow direction of the temperature control medium is opposite to the forward direction of the spinning solution.

[0052] like Figure 3-4 Embodiment 2, Figure 5 As shown in Example 3, when in use, the inventor noticed that when the flow direction of the temperature control medium (e.g., temperature control gas) is set to B→C, that is, the inlet end 1413 is set on the side close to the spinneret 111, and the outlet end 1414 is set on the side close to the pressure reducing port 131, the heat exchange efficiency between the temperature control medium (e.g., temperature control gas) and the spinning solution is better. The advantage of such a design is that, on the one hand, the temperature control medium (e.g., temperature control gas) flows in the opposite direction to the spinning solution, so that the temperature control medium (e.g., temperature control gas) and the spinning solution are convective, which greatly improves the heat exchange efficiency. On the other hand, in the decompression chamber 11, the temperature difference between the spinning solution at the solution inlet (i.e., the decompression port 131) and the spinneret 111 is the largest, and the temperature at the solution inlet is higher than that at the spinneret 111 (the solvent evaporates and takes away a large amount of heat). In each gas circulation, the temperature control medium (e.g., temperature control gas) passing through the heater 142 preferentially contacts the spinning solution close to the spinneret 111, and can heat the area with the lowest temperature with the temperature control medium (e.g., temperature control gas) at the highest temperature, thereby making the overall temperature in the decompression chamber 11 more uniform, thereby avoiding excessive temperature differences from affecting the spinning quality.

[0053] It should be noted that the above-mentioned heating device 14 and heating tube 141 are existing devices, and those skilled in the art can adaptively select appropriate models and specific component parameters of each model, including but not limited to embodiment schemes.

[0054] like Figure 5 As shown in Example 3, preferably, the decompression chamber 11 includes a first chamber 112 and a second chamber 113 which are connected in sequence, so that the spinning solution enters from the decompression port 131, flows through the first chamber 112 and the second chamber 113 in sequence, and is ejected from the spinneret 111. Along the direction in which the spinning solution moves, the cross-sectional width of the first chamber 112 gradually increases, and the cross-sectional width of the second chamber 113 remains unchanged.

[0055] In order to reduce the excessive turbulence of the spinning solution and ensure the stable flow of the spinning solution, the cross-sectional width of the first chamber 112 near the pressure relief port 131 is designed to gradually increase in the direction away from the pressure relief port 131 (in the form of Figure 5The spinning solution is shaped like a trumpet as shown). According to the principle of decompression, after the spinning solution is decompressed, a two-phase spinning solution in a stable multiphase medium sub-equilibrium state is formed. At this time, the two-phase spinning solution needs to be ejected immediately. Therefore, in order to ensure that the spinning solution does not change at this time, the cross-sectional area of ​​the second chamber 113 of the decompression chamber 11 should remain unchanged at this time, so that the sub-equilibrium state of the two-phase spinning solution can be better ensured. The design of the decompression chamber 11 with the above structure can make the flash spinning process more stable, which can significantly improve the quality of the flash-spun fibers obtained.

[0056] like Figure 5 As shown in Example 3, preferably, the first chamber 112 is a truncated cone-shaped chamber so that the cross section of the first chamber 112 is a trapezoidal cross section. Along the forward direction of the spinning solution, the spiral radius of the heating tube 141 increases linearly, and the outermost edge of the spiral coil with the smallest spiral radius of the heating tube 141 is connected to the outermost edge of the spiral coil with the largest spiral radius to form a straight line, and the straight line is parallel to the waistline of the trapezoidal cross section close to it. Further preferably, along the forward direction of the spinning solution, the spiral radius of the heating tube 141 gradually increases. Further preferably, along the forward direction of the spinning solution, the spiral radius of the heating tube 141 increases linearly. The distances between adjacent spiral coils of the heating tube 141 are equal.

[0057] like Figure 5 As shown in Example 3, the decompression chamber 11 is a chamber with a trumpet-shaped opening, and the outermost edge of the spiral coil with the smallest spiral radius of the heating tube 141 is connected to the outermost edge of the spiral coil with the largest spiral radius to form a connecting line (such as Figure 5 The first straight line 1411 and the second straight line 1412 are respectively parallel to the waistline of the trapezoidal cross section close thereto, that is, the first straight line 1411 is parallel to the first waistline 1121, and the second straight line 1412 is parallel to the second waistline 1122. Through the coordinated design of the structure of the heating tube 141 and the trumpet-shaped decompression chamber 11, the spinning solution can be evenly separated in the decompression chamber 11 to form a layered flow, which can not only reduce the impact speed of the spinning solution and reduce the violent turbulence phenomenon of the spinning solution, making the flow of the spinning solution smoother, but also improve the heat exchange efficiency between the heating tube 141 and the spinning solution.

[0058] When the decompression chamber 11 adopts a trumpet-shaped structure design, preferably, when the heating device 14 uses an electric heating tube 141, the center line of the electric heating tube 141 is designed to be located on the boundary line between the first chamber 112 and the second chamber 113. The inventors have found that the use of the electric heating tube 141 to heat the spinning solution is more efficient. Setting the electric heating tube 141 at a position closer to the spinneret 111 (relative to the exchange pipeline using a temperature control medium) can reduce the influence of the heat carried away by the evaporation of the solvent during spinning on the spinning solution in the decompression chamber 11.

[0059] When the decompression chamber 11 is designed with a trumpet-shaped structure, preferably, when the heating device 14 is a heat exchanger composed of a heat exchange tube, the heating device 14 is designed to be located in the first chamber 112. The heating device 14 is placed in the first chamber 112 to a certain extent, which can hinder the traveling speed of the spinning solution, further reduce the turbulence phenomenon, and enable the spinning solution to stabilize more quickly. It is further preferred that the tail end edge of the heat exchange tube coincides with the boundary line between the first chamber 112 and the second chamber 113.

[0060] It should be noted that: for the structural design of the heating tube 141, the spiral radius of each spiral coil may not change linearly, and the distances between adjacent spiral coils may not be equal. However, the spiral coil radius increases linearly in the flow direction of the spinning solution, and the first straight line 1411 is parallel to the first waistline 1121, and the second straight line 1412 is parallel to the second waistline 1122, which is a better choice. Such a design has a higher heat exchange effect and a smoother flow of the spinning solution.

[0061] Preferably, the decompression port 131 and the spinneret 111 are both circular structures, and the second chamber 113 is a cylindrical chamber. Further preferably, the decompression port 131 is coaxial with the spinneret 111, and the spinneret 111 is coaxial with the first chamber 112 and the second chamber 113.

[0062] Preferably, the flash spinning critical state stabilization device 100 further includes a temperature sensor 15, a pressure sensor 16 and a control system 17. The temperature sensor 15 and the pressure sensor 16 are arranged in the decompression chamber 11, and are used to detect the temperature and pressure in the decompression chamber 11. The decompression device 13 is a valve, and the temperature sensor 15, the pressure sensor 16, the heating device 14 and the valve are all electrically connected to the control system 17. Further preferably, the decompression device 13 is a ball valve.

[0063] like Figure 6 As shown, when in use, the pressure sensor 16 and the temperature sensor 15 are used for the temperature and pressure state, and the real-time detection data are sent to the control system 17, and the control system 17 changes the heating temperature of the heating device 14 according to the detection data, so as to achieve the purpose of controlling the temperature of the spinning solution in the decompression chamber 11. In addition, the decompression device 13 is arranged at the entrance of the decompression chamber 11, and is connected to the decompression chamber 11 through the decompression port 131 of the decompression device 13. When in use, the control system 17 can adjust the opening of the decompression port 131 of the decompression device 13 (i.e., adjust the valve opening) according to the pressure measured by the pressure sensor 16, so as to adjust the decompression force of the spinning solution, so as to play a role in convenient and rapid pressure control. The present application replaces the original decompression plate with the decompression device 13, and there is no need to stop the machine to replace the decompression plate according to different production needs, which greatly affects the production efficiency.

[0064] It should be noted that:

[0065] The embodiment of the present application adopts an automatic ball valve DN150. According to the above design concept, those skilled in the art may also adopt other types of valves, including but not limited to the above embodiment.

[0066] The control system 17 is a prior art, which is used to store programs internally, execute user-oriented instructions such as logic operations, sequence control, timing, counting and arithmetic operations, and control various types of machinery or production processes through digital or analog input / output. The working principles of data processing and control of various types of machinery or production processes are not described here.

[0067] The pressure sensor 16 and the temperature sensor 15 used in the present application are all existing technologies and can be replaced by other components with equivalent functions.

[0068] Preferably, the pressure sensor 16 and the temperature sensor 15 are both provided at two locations, one of which is provided near the solution inlet (ie, the pressure reducing port 131 ), and the other is provided near the spinneret 111 , for detecting the temperature and pressure state at the spinneret 111 .

[0069] Preferably, the flash spinning critical state stabilization device 100 is further provided with a transmission chamber 12, and the outlet of the transmission chamber 12 is connected to the decompression port 131 of the decompression device 13. The transmission chamber 12 is used to transmit the mixed spinning solution to the decompression device 13, so that the spinning solution is transmitted to the decompression device 13 through the transmission chamber 12, and enters from the decompression port 131 after being decompressed by the decompression device 13, and is ejected from the spinneret 111 after flowing through the decompression chamber 11.

[0070] It should be noted that:

[0071] The "cross section of the first chamber 112" mentioned herein refers to a cross section formed by cutting parallel to the axial direction of the first chamber 112, that is, a cross section formed by cutting parallel to the overall flow direction of the polymer spinning solution. For a truncated cone chamber and a cylindrical chamber, their cross sections are respectively a trapezoidal cross section and a rectangular cross section formed parallel to the axial direction.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

[0073] In addition, those skilled in the art should understand that, although there are many problems in the prior art, each embodiment or technical solution of the present application can be improved in only one or several aspects, without having to solve all the technical problems listed in the prior art or background technology at the same time. Those skilled in the art should understand that the content not mentioned in a claim should not be used as a limitation on the claim.

[0074] Although the terms such as spinneret 111, decompression chamber 11, decompression port 131 are used more in this article, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of this application. It is contrary to the spirit of this application to interpret them as any additional restrictions. The terms "first", "second", etc. (if any) in the specification and claims of the embodiments of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A flash spinning critical state stabilization device, characterized in that: A decompression chamber (11) is provided inside the chamber; A decompression device (13) is provided at one end of the decompression chamber (11), and a decompression port (131) is provided on the decompression device (13) and is connected to the decompression chamber (11); a spinneret (111) is provided at the other end of the decompression chamber (11) and is connected to the decompression chamber (11), so that a spinning solution enters from the decompression port (131) of the decompression device (13), flows through the decompression chamber (11), and is ejected from the spinneret (111); A heating device (14) is provided in the decompression chamber (11) to heat the spinning solution flowing through the decompression chamber (11); The heating device (14) comprises a heating tube (141); the heating tube (141) is arranged in the decompression chamber (11) and is used to heat the spinning solution; The heating tube (141) is a spiral coil-shaped tubular structure, which extends along the advancing direction of the spinning solution and is arranged in a spiral shape; along the advancing direction of the spinning solution, the spiral radius of the heating tube (141) gradually increases; along the advancing direction of the spinning solution, the spiral radius of the heating tube (141) increases linearly; the distances between adjacent spiral coils of the heating tube (141) are equal; The decompression chamber (11) comprises a first chamber (112) and a second chamber (113) which are connected in sequence, so that the spinning solution enters from the decompression port (131), flows through the first chamber (112) and the second chamber (113) in sequence, and is then ejected from the spinneret (111); along the direction in which the spinning solution moves, the cross-sectional width of the first chamber (112) gradually increases, while the cross-sectional width of the second chamber (113) remains unchanged; The heating device (14) is located in the first chamber (112) to heat the spinning solution flowing through the first chamber (112); the first chamber (112) is a truncated cone-shaped chamber, and the cross-section of the first chamber (112) is a trapezoidal cross-section; along the forward direction of the spinning solution, the spiral radius of the heating tube (141) increases linearly, and the outermost edge of the spiral coil with the smallest spiral radius of the heating tube (141) is connected to the outermost edge of the spiral coil with the largest spiral radius to form a straight line, and the straight line is parallel to the waistline of the trapezoidal cross-section adjacent to it.

2. The flash spinning critical state stabilization device according to claim 1, characterized in that: The heating device (14) further comprises a heater (142) for heating the temperature control medium; The heating tube (141) is a heat exchange tube, which serves as a channel for the circulation of a temperature control medium, and its inlet end (1413) and outlet end (1414) are respectively connected to the heater (142), so that the temperature control medium is heated by the heater (142), enters from the inlet end (1413), flows through the heat exchange tube, and then flows back to the heater (142) from the outlet end (1414); The inlet end (1413) is located at one end close to the spinneret (111), and the outlet end (1414) is located at the other end close to the decompression port (131).

3. The flash spinning critical state stabilization device according to claim 1, characterized in that: It also includes a temperature sensor (15), a pressure sensor (16) and a control system (17); The temperature sensor (15) and the pressure sensor (16) are arranged in the decompression chamber (11) and are used to detect the temperature and pressure in the decompression chamber (11); the decompression device (13) is a valve, and the temperature sensor (15), the pressure sensor (16), the heating device (14) and the valve are all electrically connected to the control system (17).

4. A flash spinning device, characterized in that: It comprises the flash spinning critical state stabilization device (100) as described in any one of claims 1 to 3.

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