Static mixing equipment for producing soft polyurethane foam from liquid carbon dioxide

Abstract

The invention discloses static mixing equipment for producing soft polyurethane foam from liquid carbon dioxide, and particularly relates to the field of soft polyurethane foam production.The static mixing equipment comprises a mixing mechanism, the mixing mechanism comprises a plurality of mixing cylinders which are sequentially connected in the vertical direction, and spiral blades are arranged in the multiple mixing cylinders; a feeding pipe is arranged at the top end of the uppermost mixing barrel and comprises two feeding ends, a discharging pipe is arranged at the bottom end of the lowermost mixing barrel, and materials enter through the two feeding ends, sequentially pass through the multiple mixing barrels which are vertically and sequentially connected to be mixed and then are discharged through the discharging pipe. According to the invention, the pressurization mechanism is arranged between the two adjacent mixing cylinders, so that the effect of segmented pressurization is realized, and the problem that the flow velocity is reduced due to pressure loss of liquid carbon dioxide and polyether during flowing due to a long stroke and further the polyether is easily adhered to the helical blades in the mixing process is solved through segmented pressurization.

Description

Technical Field

[0001] The invention relates to the technical field of soft polyurethane foam production, and more specifically to a static mixing device for producing soft polyurethane foam with liquid carbon dioxide. Background Art

[0002] Polyurethane foam is a lightweight material widely used in furniture, construction, automobiles and other fields. It has excellent thermal insulation, sound insulation and comfort. In the traditional production of polyurethane foam, environmentally harmful chemical foaming agents are often used. These substances will have a negative impact on the atmospheric ozone layer.

[0003] The process of producing soft polyurethane foam with liquid carbon dioxide is a method of manufacturing polyurethane foam using liquid carbon dioxide as a physical foaming agent. Compared with traditional foaming agents, this method is more environmentally friendly and can effectively reduce damage to the ozone layer.

[0004] At present, when liquid carbon dioxide is used to produce soft polyurethane foam, since liquid carbon dioxide has good solubility in polyether components, in order to improve the mixing effect of liquid carbon dioxide and polyether, it is necessary to directly mix the liquid carbon dioxide and polyether under high pressure through a static mixer. Since the primary premise of using liquid carbon dioxide as a physical foaming agent is that carbon dioxide must remain in a liquid state during the entire metering and mixing process with the material, carbon dioxide is a gas at room temperature and pressure, and is a liquid at -56 to -31°C. Therefore, it is necessary to keep the carbon dioxide at a low temperature during mixing. Therefore, during the mixing process, the temperature of the polyether is also low. At the same time, due to The viscosity of polyether is high at low temperatures, and it is easy for the polyether to stick to the spiral blades of the static mixer during the mixing process. The adhesion of polyether will hinder the normal flow of the fluid in the static mixer, resulting in uneven flow of the fluid in the mixer. This unevenness will affect the mixing effect and cause unstable quality of the final product. However, since liquid carbon dioxide and polyether enter the static mixer under high pressure for mixing during the mixing process, when liquid carbon dioxide and polyether enter the static mixer under high pressure, their fluidity can be improved. The high-speed flow of liquid brought by the high pressure can reduce the adhesion of polyether under low temperature.

[0005] However, in order to ensure the mixing effect of liquid carbon dioxide and polyether, the static mixer used is equipped with multiple sets of spiral fixed mechanical devices. In the process of liquid carbon dioxide and polyether flowing, the effect of enhanced mixing is achieved through shearing, material flow, and remixing. However, when the fluid flows through the mixer, the laminar structure of the fluid is broken, resulting in shearing. This shearing power consumes part of the energy, resulting in pressure drop and flow rate reduction. In addition, due to the multiple sets of spiral mechanical devices, the flow stroke of liquid carbon dioxide and polyether is relatively long. Therefore, in the process of liquid carbon dioxide and polyether flowing, as the pressure is lost, the fluid flow rate will be reduced. The longer the stroke, the greater the pressure loss, resulting in a lower flow rate, which will lead to the flow rate being insufficient to reduce the adhesion of the polyether, thereby causing the polyether to easily adhere and affect the mixing effect. Summary of the invention

[0006] The present invention provides a static mixing device for producing soft polyurethane foam from liquid carbon dioxide, and aims to solve the following problem: in the existing process of mixing liquid carbon dioxide and polyether through a static mixer, multiple groups of spiral mechanical devices are used for mixing, and the liquid carbon dioxide and polyether need to be sequentially passed through the multiple groups of spiral mechanical devices, and the flow formation is relatively long. At the same time, pressure loss will be generated during the flow of the liquid carbon dioxide and the polyether, and the pressure loss will cause the flow rate of the fluid to decrease. The longer the stroke, the greater the pressure loss, resulting in a lower flow rate, which will further cause the flow rate to be insufficient to reduce the adhesion of the polyether, thereby causing the polyether to easily adhere and affect the mixing effect.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a static mixing device for producing soft polyurethane foam from liquid carbon dioxide, comprising: a mixing mechanism, the mixing mechanism comprising a plurality of mixing cylinders connected in sequence in a vertical direction, the plurality of mixing cylinders are each provided with a spiral blade, a feed pipe is provided at the top of the mixing cylinder located at the top, the feed pipe comprises two feed ends, a discharge pipe is provided at the bottom of the mixing cylinder located at the bottom, the material enters through the two feed ends, and is sequentially mixed through the plurality of mixing cylinders connected in sequence vertically, and then discharged through the discharge pipe; A boosting mechanism is provided between two adjacent mixing cylinders, and the boosting mechanism includes a fixed box, which is fixedly arranged between two adjacent mixing cylinders, and is provided with a feed port and a discharge port. The fixed box is respectively connected with the corresponding mixing cylinders through the feed port and the discharge port, and a one-way valve is provided in the feed port and the discharge port. A side cylinder connected with the fixed box is provided on the fixed box, and a piston is slidingly and sealingly connected in the side cylinder. When mixing materials, the boosting mechanism performs segmented boosting of the flow of materials through sliding suction of the piston.

[0008] In a preferred embodiment, the boost mechanism further includes a driving assembly, a side plate is mounted on the output end of the driving assembly, a shift shaft is mounted on the side plate, a rectangular frame is fixedly mounted on one side of the piston, and the rectangular frame is movably mounted on the shift shaft.

[0009] In a preferred embodiment, the driving assembly includes a power component, the side plate includes two transverse plates, a rotating shaft is fixedly arranged between the two transverse plates, and a bevel gear is fixedly arranged on the output end of the power component and the rotating shaft, and the two bevel gears are meshed.

[0010] In a preferred embodiment, a gas delivery mechanism is provided on the feed pipe, and the gas delivery mechanism includes an air delivery pipe, and the feed pipe inputs gas medium into the material through the air delivery pipe.

[0011] In a preferred embodiment, the air inlet end of the air supply pipe is connected to an air inlet assembly, the air outlet end of the air supply pipe is connected to a feed pipe, and the air outlet end of the air supply pipe is provided with an anti-backflow assembly.

[0012] In a preferred embodiment, an air supply control mechanism is provided on the air supply pipe, and the air supply control mechanism includes a fixed seat, which is fixed in the air supply pipe, and a ball is rotatably arranged in the fixed seat, and a vent hole is arranged on the ball. The air supply control mechanism controls the air supply by rotating the ball.

[0013] In a preferred embodiment, a connecting shaft is fixedly provided on the sphere, the end of the connecting shaft extends outside the air supply pipe, and a connecting strip is fixedly provided. A connecting plate is fixedly provided on the rectangular frame above, and a plurality of elastic parts are fixedly provided on the connecting plate, and the plurality of elastic parts are in active contact with the connecting strip.

[0014] In a preferred embodiment, two limiting plates are fixedly provided on the feed pipe, and both limiting plates are in active contact with the connecting strip, and the two limiting plates are used to limit the connecting strip.

[0015] In a preferred embodiment, the static mixing device further comprises a cooling mechanism, which comprises a spiral tube, and the spiral tube is fixedly arranged on the outside of the mixing cylinder. The cooling mechanism cools the material by injecting a cooling medium into the spiral tube.

[0016] In a preferred embodiment, the cooling mechanism also includes a connecting box, the liquid outlet end of the connecting box is connected to the liquid inlet end of the spiral tube, a liquid inlet pipe is arranged on the connecting box, and a one-way valve is arranged in the liquid inlet pipe and the liquid inlet end of the spiral tube. The liquid inlet end of the liquid inlet pipe and the liquid outlet end of the spiral tube are connected to the same liquid storage component, a piston plate is connected with a sliding seal in the connecting box, a vertical plate is fixedly arranged on one side of the piston plate, a fixed plate is fixedly arranged on the rectangular frame located below, and the fixed plate is fixedly connected to the vertical plate.

[0017] The beneficial effects of the present invention are: The present invention achieves the effect of segmented pressurization by arranging a pressurizing mechanism between two adjacent mixing cylinders, so that the segmented pressurization can solve the problem that the pressure loss of liquid carbon dioxide and polyether during flow due to a long stroke leads to a reduction in their flow rate, thereby causing the polyether to easily adhere to the spiral blades during the mixing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The three-dimensional structure of the present invention is shown in FIG. Figure 1 .

[0019] Figure 2 The cross-sectional structure diagram of the main view of the present invention is shown in FIG. Figure 1 .

[0020] Figure 3 It is a structural schematic diagram of another working state of the boosting mechanism of the present invention.

[0021] Figure 4 The three-dimensional structure of the present invention is shown in FIG. Figure 2 .

[0022] Figure 5 It is a structural schematic diagram of the gas transmission mechanism of the present invention.

[0023] Figure 6 The three-dimensional structure of the present invention is shown in FIG. Figure 3 .

[0024] Figure 7 Schematic diagram of the partial structure of the air supply control mechanism of the present invention Figure 1 .

[0025] Figure 8 for Figure 7 Enlarged view of part A.

[0026] Fig. 9 Schematic diagram of the partial structure of the air supply control mechanism of the present invention Figure 2 .

[0027] Fig.10 for Fig. 9 Magnified view of part B.

[0028] Fig.11 for Figure 8 Schematic diagram of another working state of the central air supply control mechanism.

[0029] Fig.12 The main view of the cross-sectional structure Figure 2 .

[0030] Fig.13 It is a structural schematic diagram of the cooling mechanism of the present invention.

[0031] The reference numerals are: 1, mixing mechanism; 11, mixing cylinder; 111, spiral blade; 12, feed pipe; 13, discharge pipe; 2, booster mechanism; 21, fixing box; 211, feed port; 212, discharge port; 22, side cylinder; 23, piston; 24, side plate; 241, cross plate; 25, dial shaft; 26, rectangular frame; 27, drive assembly; 271, power component; 272, rotating shaft; 273, Bevel gear; 3. air transmission mechanism; 31. air supply pipe; 32. anti-backflow assembly; 4. air supply control mechanism; 41. fixed seat; 42. ball; 421. vent hole; 43. connecting shaft; 44. connecting strip; 45. connecting plate; 46. elastic member; 47. limit plate; 5. cooling mechanism; 51. spiral tube; 52. connecting box; 53. liquid inlet pipe; 54. piston plate; 55. vertical plate; 56. fixed plate. DETAILED DESCRIPTION

[0032] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0033] Refer to the instruction manual Figures 1 to 3 A static mixing device for producing soft polyurethane foam from liquid carbon dioxide comprises: a mixing mechanism 1, the mixing mechanism 1 comprises a plurality of mixing cylinders 11 connected in sequence in a vertical direction, a spiral blade 111 is arranged in each of the plurality of mixing cylinders 11, a feed pipe 12 is arranged at the top of the mixing cylinder 11 located at the top, the feed pipe 12 comprises two feed ends, a discharge pipe 13 is arranged at the bottom of the mixing cylinder 11 located at the bottom, the material enters through the two feed ends, and is sequentially mixed by passing through the plurality of mixing cylinders 11 connected in sequence vertically, and then discharged through the discharge pipe 13; A boosting mechanism 2 is provided between two adjacent mixing cylinders 11, and the boosting mechanism 2 includes a fixed box 21, which is fixedly provided between two adjacent mixing cylinders 11, and is provided with a feed port 211 and a discharge port 212. The fixed box 21 is respectively connected with the corresponding mixing cylinder 11 through the feed port 211 and the discharge port 212, and a one-way valve is provided in the feed port 211 and the discharge port 212. A side cylinder 22 connected with the fixed box 21 is provided on the fixed box 21, and a piston 23 is slidably and sealably connected in the side cylinder 22. When mixing materials, the boosting mechanism 2 performs segmented boosting on the flow of materials through sliding suction of the piston 23.

[0034] It should be noted that there are three mixing barrels 11, which are connected in sequence in the vertical direction. The angles of the spiral blades 111 arranged in the three mixing barrels 11 are alternately arranged, which are clockwise, counterclockwise and clockwise from top to bottom in the vertical direction, respectively. The materials include liquid carbon dioxide and polyether. When feeding, the liquid carbon dioxide and polyether are fed from the two feeding ends of the feed pipe 12 through a high-pressure metering pump. The boosting mechanism 2 includes two groups, and the two groups of boosting mechanisms 2 are respectively arranged between two adjacent mixing barrels 11. By arranging a boosting mechanism 2 between two adjacent mixing barrels 11, a segmented boosting effect is achieved.

[0035] The specific implementation scenario is as follows: during mixing, liquid carbon dioxide and polyether are fed from the two feeding ends of the feeding pipe 12 respectively through a high-pressure metering pump, so that the liquid carbon dioxide and polyether flow from top to bottom and mix in the uppermost mixing barrel 11, and at the same time, the piston 23 is driven to slide in the side barrel 22 to play a role of negative pressure suction. During the flow of liquid carbon dioxide and polyether, a force that sucks liquid carbon dioxide and polyether from top to bottom is formed, so that the flow and mixing of liquid carbon dioxide and polyether can be pressurized and the flow rate can be increased, so that the liquid carbon dioxide and polyether mixed through the uppermost mixing barrel 11 can be drawn into the fixed box 21, and as the driving piston 23 slides and compresses, the fixed box The liquid carbon dioxide and polyether in 21 are pushed into the middle mixing barrel 11 through the discharge port 212. At the same time, the boosting mechanism 2 located below can suck the liquid carbon dioxide and polyether entering the middle mixing barrel 11 into the lowest mixing barrel 11 through suction, so that they can play a segmented boosting effect during the flow and mixing process of the liquid carbon dioxide and polyether. Through the segmented boosting, the liquid carbon dioxide and polyether can be boosted when flowing and mixing in each section of the mixing barrel 11, and the flow rate of the liquid carbon dioxide and polyether can be increased, thereby solving the problem that the pressure loss of the liquid carbon dioxide and polyether during the flow due to the long stroke leads to a reduction in their flow rate, which in turn causes the polyether to easily adhere to the spiral blades 111 during the mixing process.

[0036] For further information, please refer to the attached manual. Figure 2 The boost mechanism 2 also includes a driving assembly 27 , a side plate 24 is installed at the output end of the driving assembly 27 , a shift shaft 25 is installed on the side plate 24 , a rectangular frame 26 is fixedly provided on one side of the piston 23 , and the rectangular frame 26 is movably provided on the shift shaft 25 .

[0037] It should be noted that the driving assembly 27 can be a motor, which drives the side plate 24 to rotate, so that the side plate 24 can drive the shift shaft 25 to perform orbital motion, and the shift shaft 25 can shift the rectangular frame 26 to move back and forth left and right, thereby driving the piston 23 to move back and forth left and right in the side tube 22 to achieve the effect of negative pressure suction.

[0038] In the above technical solution, since it is necessary to achieve the effect of staged supercharging, the pistons 23 in the two supercharging mechanisms 2 need to maintain opposite movement directions, so that when the piston 23 located at the upper side is sliding and sucking, the piston 23 located at the lower side needs to be in the effect of sliding compression to push the liquid carbon dioxide and polyether to flow. For this reason, the present invention proposes a specific structure of a driving component 27. For details, refer to the attached manual. Figure 2 The driving assembly 27 includes a power component 271, and the side plate 24 includes two horizontal plates 241. A rotating shaft 272 is fixedly arranged between the two horizontal plates 241. A bevel gear 273 is fixedly arranged on the output end of the power component 271 and the rotating shaft 272, and the two bevel gears 273 are meshed with each other.

[0039] It should be noted that the power component 271 is a motor. When the two bevel gears 273 are in meshing state, the motor is driven to drive the two horizontal plates 241 to rotate simultaneously through the rotating shaft 272. Figure 1 As shown, the upper shift shaft 25 and the lower shift shaft 25 are in opposite positions, so that when the two horizontal plates 241 are driven to rotate simultaneously, the two shift shafts 25 can shift the two rectangular frames 26 to drive the corresponding pistons 23 to move in opposite directions.

[0040] In the above technical solution, since tiny bubbles will appear in the process of mixing liquid carbon dioxide and polyether during production, a small amount of nucleating gas needs to be input to ensure that there are enough initiation points for foam formation. For this reason, the present invention also proposes a gas supply mechanism 3 for inputting gas medium when mixing liquid carbon dioxide and polyether.

[0041] For details, please refer to the attached manual. Figure 4 and Figure 5 A gas delivery mechanism 3 is provided on the feed pipe 12, and the gas delivery mechanism 3 includes an air delivery pipe 31. The feed pipe 12 inputs gas medium into the material through the air delivery pipe 31. The air inlet end of the air delivery pipe 31 is connected to an air inlet component, and the air outlet end of the air delivery pipe 31 is connected to the feed pipe 12, and the air outlet end of the air delivery pipe 31 is provided with an anti-backflow component 32.

[0042] It should be noted that the gas medium is nitrogen. In traditional soft foam production, compressed dry air is usually used as the nucleating gas. However, in a system using liquid carbon dioxide as a physical foaming agent, nitrogen is required as the nucleating gas. In addition, due to the increase in system pressure, the pressure required for the nucleating gas is higher than the pressure used for traditional foaming, which exceeds the standard industrial compressed air supply range. Therefore, the air intake component uses bottled nitrogen equipped with an output pressure regulator to ensure the stability of the system pressure. When the liquid carbon dioxide and polyether are fed and mixed through the two feed ends of the feed pipe 12, nitrogen is input into the liquid carbon dioxide and polyether through the bottled nitrogen equipped with an output pressure regulator and the air supply pipe 31 to ensure that there are sufficient initiation points for foam formation. The anti-backflow component 32 is a one-way valve, which prevents liquid carbon dioxide and polyether from entering the air supply pipe 31 from the air outlet end of the air supply pipe 31 when nitrogen is input.

[0043] It should also be noted that by introducing nitrogen during the mixing process of liquid carbon dioxide and polyether, not only can the shape of the foam be guaranteed to have sufficient initiation points, but also the adhesion of the polyether on the spiral blade 111 can be effectively reduced. When the gas is introduced into the high-viscosity polyether, the gas will form bubbles in the liquid. The formation and movement of the bubbles will break the continuity of the liquid, causing the polyether molecules to be disturbed in different directions. The bubbles will rise and push the surrounding fluid to form a dynamic stirring effect of the fluid, thereby promoting the flow of the polyether to reduce the accumulation and adhesion of the polyether on the blade. After the introduction of nitrogen, the formation of the foam will change the pattern of the fluid and reduce the surrounding liquid. This means that the fluidity of the fluid is improved and it is not easy to adhere to the spiral blades 111. At the same time, the gas forms foam in the liquid, which can improve the dispersion performance of the fluid. The presence of bubbles enhances the kinetic energy of the fluid, helps to maintain the uniform distribution of the polyether, and reduces the local high viscosity area. In addition, the introduction of bubbles can increase the turbulence intensity inside the mixing barrel 11, making the mixing more uniform. Turbulence can make the interaction between liquids more significant, thereby reducing the adhesion of polyether to the wall of the mixing barrel 11. The addition of gas can promote the reorganization of small bundles of fluid, reduce local aggregation, and improve the overall mixing efficiency, making it difficult for polyether to be retained on the wall of the mixing barrel 11.

[0044] In the above technical scheme, nitrogen is input during the mixing process of liquid carbon dioxide and polyether to ensure that there are enough initiation points for foam formation. However, due to the segmented pressurization setting of the boosting mechanism 2, after the liquid carbon dioxide and polyether flow from the mixing barrel 11 located at the top to the fixed box 21 located at the top, the liquid carbon dioxide and polyether in the fixed box 21 are transported to the mixing barrel 11 located in the middle under the sliding compression of the piston 23. Due to the one-way valve provided in the feed port 211 and the continuous input of liquid carbon dioxide and polyether in the two feed ends of the feed pipe 12, the liquid carbon dioxide and polyether will remain in the mixing barrel 11 located at the top for a period of time under the input of liquid carbon dioxide and polyether. This time is the time for the liquid carbon dioxide and polyether in the fixed box 21 to be filled. The time for the liquid carbon dioxide and polyether to be transported to the mixing barrel 11 located in the middle, if nitrogen is still continuously input at this time, it will cause excessive nitrogen input. When the nitrogen input is too much, it will lead to an excessive number of bubbles, which will hinder the effective flow of the fluid inside, causing the bubbles to be unevenly distributed in the mixing barrel 11, and then lead to a decrease in mixing efficiency. In addition, excessive nitrogen will not make it possible for the bubbles to interact with each other, so that a stable initiation point cannot be formed, which will affect the foaming effect of the final foam. For this reason, the present invention also proposes an air supply control mechanism 4, which is used to control the air supply, so that nitrogen is continuously supplied when the liquid carbon dioxide and polyether flow and mix, and when the liquid carbon dioxide and polyether stay in the mixing barrel 11, the nitrogen supply is stopped.

[0045] For details, please refer to the attached manual. Figures 6 to 8 as well as Fig.11 An air supply control mechanism 4 is arranged on the air supply pipe 31, and the air supply control mechanism 4 includes a fixed seat 41, and the fixed seat 41 is fixedly arranged in the air supply pipe 31, and a ball 42 is rotatably arranged in the fixed seat 41, and a vent hole 421 is arranged on the ball 42. The air supply control mechanism 4 controls the air supply by the rotation of the ball 42.

[0046] It should be noted that when the liquid carbon dioxide and the polyether are flowing and mixing, the nitrogen can enter the liquid carbon dioxide and the polyether through the vent hole 421 and the anti-backflow component 32 to transport the nitrogen. When the liquid carbon dioxide and the polyether stay in the mixing barrel 11, the ball 42 is driven to rotate so that the nitrogen cannot flow through the vent hole 421, thereby achieving the effect of stopping the delivery of nitrogen. For this reason, the present invention also proposes a specific structure for driving the vent hole 421 to rotate. For details, refer to the attached specification. Figure 6 , Fig. 9 as well as Fig.10A connecting shaft 43 is fixedly provided on the sphere 42, the end of the connecting shaft 43 extends to the outside of the air supply pipe 31, and a connecting strip 44 is fixedly provided thereon. A connecting plate 45 is fixedly provided on the rectangular frame 26 located above, and a plurality of elastic members 46 are fixedly provided on the connecting plate 45, and the plurality of elastic members 46 are in active contact with the connecting strip 44. Two limiting plates 47 are fixedly provided on the feed pipe 12, and the two limiting plates 47 are in active contact with the connecting strip 44, and the two limiting plates 47 are used to limit the connecting strip 44.

[0047] It should be noted that the elastic member 46 is a flexible paddle. When the piston 23 located at the top slides to the right, the connecting plate 45 can be driven to slide to the right through the rectangular frame 26 located at the top, and the connecting strip 44 can be moved through multiple flexible paddles, so that the ball 42 can keep the vent hole 421 and the air supply pipe 31 in a connected state through the connecting shaft 43. When the piston 23 located at the top slides to the left, the connecting plate 45 can be driven to slide to the left through the rectangular frame 26 located at the top, so that the connecting strip 44 can be moved through multiple flexible paddles. 4 swing angle, and under the action of the limit plate 47, the connecting shaft 43 can drive the ball 42 to rotate the angle, so that the ball 42 keeps the vent hole 421 and the air supply pipe 31 in a disconnected state through the connecting shaft 43, thereby stopping the delivery of nitrogen, and then when the boosting mechanism 2 slides to suck the liquid carbon dioxide and polyether, the gas delivery mechanism 3 can continue to deliver nitrogen, and when the boosting mechanism 2 slides to compress and deliver the liquid carbon dioxide and polyether, the nitrogen delivery is stopped, thereby solving the impact caused by excessive nitrogen delivery.

[0048] In the above technical solution, when liquid carbon dioxide and polyether flow and mix in the mixing barrel 11, since the spiral blades 111 are arranged inside the mixing barrel 11, the liquid carbon dioxide and polyether will be subjected to shear force when passing through the spiral blades 111. The shear force intensifies the activity of the material molecules, thereby generating heat. This heat causes the material temperature to rise. However, since carbon dioxide needs to be in a low temperature state to remain in a liquid state, the present invention also proposes a cooling mechanism 5 for cooling the liquid carbon dioxide when it is heated up by flowing and mixing, so as to solve the problem that the temperature rise affects the state of carbon dioxide.

[0049] For details, please refer to the attached manual. Fig.12 and Fig.13The static mixing device also includes a cooling mechanism 5, which includes a spiral tube 51, which is fixedly arranged on the outer side of the mixing barrel 11. The cooling mechanism 5 cools the material by injecting a cooling medium into the spiral tube 51. The cooling mechanism 5 also includes a connecting box 52, the liquid outlet end of the connecting box 52 is connected to the liquid inlet end of the spiral tube 51, and a liquid inlet pipe 53 is arranged on the connecting box 52. Both the liquid inlet pipe 53 and the liquid inlet end of the spiral tube 51 are provided with a one-way valve. The liquid inlet end of the liquid inlet pipe 53 and the liquid outlet end of the spiral tube 51 are connected to the same liquid storage component. A piston plate 54 is slidingly sealed in the connecting box 52, and a vertical plate 55 is fixedly arranged on one side of the piston plate 54. A fixed plate 56 is fixedly arranged on the rectangular frame 26 located below, and the fixed plate 56 is fixedly connected to the vertical plate 55.

[0050] It should be noted that the cooling medium can be a coolant, and the liquid storage component can be a box for storing the coolant, and a condenser and a temperature sensor are arranged in the box so that the coolant in the box can be kept at an appropriately low temperature. In the process of mixing the liquid carbon dioxide and the polyether, the reciprocating motion of the rectangular frame 26 located below can drive the vertical plate 55 to reciprocate through the fixed plate 56, thereby driving the piston plate 54 to reciprocate through the vertical plate 55, and during the reciprocating motion of the piston plate 54, the coolant is drawn into the connecting box 52 through the liquid inlet pipe 53 through negative pressure suction, and is transported to the spiral tube 51. When the coolant flows in the spiral tube 51, heat exchange can be performed, so that the liquid carbon dioxide can be kept at a low temperature, and the coolant after heat exchange can flow back into the box through the spiral tube 51 and be reused after being cooled by the condenser.

[0051] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A static mixing device for producing soft polyurethane foam from liquid carbon dioxide, characterized in that: include: A mixing mechanism (1), the mixing mechanism (1) comprising a plurality of mixing cylinders (11) connected in sequence in a vertical direction, each of the plurality of mixing cylinders (11) being provided with a spiral blade (111), a feed pipe (12) being provided at the top end of the mixing cylinder (11) located at the top, the feed pipe (12) comprising two feed ends, a discharge pipe (13) being provided at the bottom end of the mixing cylinder (11) located at the bottom, materials entering through the two feed ends, passing through the plurality of mixing cylinders (11) connected in sequence in a vertical direction for mixing, and then discharged through the discharge pipe (13); A pressurizing mechanism (2) is provided between two adjacent mixing barrels (11), the pressurizing mechanism (2) comprising a fixed box (21), the fixed box (21) being fixedly provided between the two adjacent mixing barrels (11), the fixed box (21) being provided with a feed port (211) and a discharge port (212), the fixed box (21) being connected to the corresponding mixing barrel (11) through the feed port (211) and the discharge port (212), and a one-way valve is provided in each of the feed port (211) and the discharge port (212), the fixed box (21) being provided with a side barrel (22) connected to the fixed box (21), the side barrel (22) being slidably and sealingly connected with a piston (23), and when mixing materials, the pressurizing mechanism (2) performs segmented pressurization on the flow of materials through sliding suction of the piston (23).

2. The static mixing device for producing soft polyurethane foam from liquid carbon dioxide according to claim 1, characterized in that: The boost mechanism (2) further comprises a drive assembly (27), the output end of the drive assembly (27) being provided with a side plate (24), a shifting shaft (25) being provided on the side plate (24), a rectangular frame (26) being fixedly provided on one side of the piston (23), and the rectangular frame (26) being movably provided on the shifting shaft (25).

3. The static mixing device for producing soft polyurethane foam from liquid carbon dioxide according to claim 2, characterized in that: The driving assembly (27) comprises a power component (271), the side plate (24) comprises two transverse plates (241), a rotating shaft (272) is fixedly arranged between the two transverse plates (241), and a bevel gear (273) is fixedly arranged on the output end of the power component (271) and the rotating shaft (272), and the two bevel gears (273) are meshed with each other.

4. A static mixing device for producing soft polyurethane foam from liquid carbon dioxide according to claim 3, characterized in that: The feed pipe (12) is provided with a gas delivery mechanism (3), the gas delivery mechanism (3) comprising an air delivery pipe (31), and the feed pipe (12) inputs gaseous medium into the material through the air delivery pipe (31).

5. The static mixing device for producing soft polyurethane foam from liquid carbon dioxide according to claim 4, characterized in that: The air inlet end of the air supply pipe (31) is connected to an air inlet assembly, the air outlet end of the air supply pipe (31) is connected to a feed pipe (12), and the air outlet end of the air supply pipe (31) is provided with an anti-backflow assembly (32).

6. The static mixing device for producing soft polyurethane foam from liquid carbon dioxide according to claim 5, characterized in that: An air supply control mechanism (4) is arranged on the air supply pipe (31), and the air supply control mechanism (4) comprises a fixed seat (41), the fixed seat (41) is fixedly arranged in the air supply pipe (31), and a round ball (42) is rotatably arranged in the fixed seat (41), and a vent hole (421) is arranged on the round ball (42), and the air supply control mechanism (4) controls air supply through the rotation of the round ball (42).

7. A static mixing device for producing soft polyurethane foam from liquid carbon dioxide according to claim 6, characterized in that: A connecting shaft (43) is fixedly provided on the sphere (42), the end of the connecting shaft (43) extending outside the air supply pipe (31) and fixedly provided with a connecting strip (44), a connecting plate (45) is fixedly provided on the rectangular frame (26) located above, a plurality of elastic members (46) are fixedly provided on the connecting plate (45), and the plurality of elastic members (46) are in active contact with the connecting strip (44).

8. The static mixing device for producing soft polyurethane foam from liquid carbon dioxide according to claim 7, characterized in that: Two limit plates (47) are fixedly provided on the feed pipe (12), and the two limit plates (47) are both in active contact with the connecting strip (44). The two limit plates (47) are used to limit the connecting strip (44).

9. A static mixing device for producing soft polyurethane foam from liquid carbon dioxide according to claim 8, characterized in that: The static mixing device further comprises a cooling mechanism (5), wherein the cooling mechanism (5) comprises a spiral tube (51), wherein the spiral tube (51) is fixedly arranged on the outside of the mixing cylinder (11), and the cooling mechanism (5) cools the material by injecting a cooling medium into the spiral tube (51).

10. The static mixing device for producing soft polyurethane foam from liquid carbon dioxide according to claim 9, characterized in that: The cooling mechanism (5) further comprises a connection box (52), the liquid outlet end of the connection box (52) being connected to the liquid inlet end of the spiral tube (51), the connection box (52) being provided with a liquid inlet pipe (53), both the liquid inlet pipe (53) and the liquid inlet end of the spiral tube (51) being provided with a one-way valve, the liquid inlet end of the liquid inlet pipe (53) and the liquid outlet end of the spiral tube (51) being connected to the same liquid storage component, the connection box (52) being slidably sealed with a piston plate (54), a vertical plate (55) being fixedly provided on one side of the piston plate (54), a fixed plate (56) being fixedly provided on a rectangular frame (26) located below, the fixed plate (56) being fixedly connected to the vertical plate (55).

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