Static mixing device for liquid carbon dioxide production of flexible polyurethane foam

Abstract

The application discloses a kind of liquid carbon dioxide production soft polyurethane foam static mixing equipment, specifically relates to soft polyurethane foam production field, including: mixing mechanism, mixing mechanism includes multiple in vertical direction sequentially connected mixing cylinder, multiple mixing cylinder are all provided with helical blade, the top of the uppermost mixing cylinder is provided with feed pipe, feed pipe includes two feed ends, the bottom of the lowermost mixing cylinder is provided with discharge pipe, material enters by two feed ends, and sequentially through multiple vertical sequentially connected mixing cylinder is mixed after being discharged by discharge pipe.The application is provided with booster mechanism between adjacent two mixing cylinders, realizes the effect of segmented pressurization, so that it can be segmented pressurization, solve because the stroke is long, the pressure loss of liquid carbon dioxide and polyether when flowing causes its flow rate to reduce, and then cause polyether to easily stick on the problem of helical blade in mixing process.

Description

Technical Field

[0001] The present invention relates to the technical field of soft polyurethane foam production, and more particularly to a static mixing device for producing soft polyurethane foam from 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. Traditional polyurethane foam production often uses environmentally harmful chemical foaming agents. These substances have a negative impact on the atmospheric ozone layer.

[0003] The process of producing soft polyurethane foam using liquid carbon dioxide is a polyurethane foam manufacturing method that uses 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 producing soft polyurethane foam by liquid carbon dioxide, 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 first prerequisite for using liquid carbon dioxide as a physical foaming agent is that the 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 a liquid at -56 to -31°C. Therefore, the carbon dioxide needs to be kept 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 Polyether has a high viscosity at low temperatures, which can easily lead to the problem of polyether sticking 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 fluid flow in the mixer. This unevenness will affect the mixing effect and lead to unstable quality of the final product. However, since liquid carbon dioxide and polyether enter the static mixer under high pressure during the mixing process, their fluidity can be improved when they enter the static mixer under high pressure. The high-speed flow of liquid brought by the high pressure can reduce the adhesion of polyether at low temperatures.

[0005] However, in order to ensure the mixing effect of liquid carbon dioxide and polyether, the static mixer used is currently equipped with multiple sets of spiral stationary mechanical devices. During the flow of liquid carbon dioxide and polyether, the process of shearing, material flow, and remixing is used to achieve the effect of enhanced mixing. However, when the fluid flows through the mixer, the laminar structure of the fluid is broken, resulting in a shearing effect. This shearing power will consume a part of the energy, resulting in a pressure drop and a decrease in flow rate. In addition, due to the multiple sets of spiral mechanical devices, the flow path of the liquid carbon dioxide and polyether is relatively long. Therefore, during the flow of liquid carbon dioxide and polyether, as the pressure is lost, the fluid flow rate will be reduced. The longer the path, the greater the pressure loss, resulting in a lower flow rate, which in turn will 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. 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 sets of spiral mechanical devices are used for mixing. The liquid carbon dioxide and polyether need to pass through the multiple sets of spiral mechanical devices in sequence, resulting in a long flow path. At the same time, pressure loss is generated during the flow of the liquid carbon dioxide and polyether, which reduces the flow rate of the fluid. The longer the stroke, the greater the pressure loss, resulting in a lower flow rate, which in turn leads to a flow rate that is insufficient to reduce the adhesion of the polyether, thereby causing the polyether to easily adhere and affecting the mixing effect.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a static mixing device for producing flexible polyurethane foam from liquid carbon dioxide, comprising: a mixing mechanism, the mixing mechanism comprising a plurality of mixing drums connected in sequence in a vertical direction, each of the plurality of mixing drums being provided with a spiral blade, a feed pipe being provided at the top end of the topmost mixing drum, the feed pipe comprising two feed ends, and a discharge pipe being provided at the bottom end of the bottommost mixing drum, wherein the material enters through the two feed ends, passes through the plurality of vertically connected mixing drums in sequence for mixing, and is discharged through the discharge pipe;

[0008] A boosting mechanism is provided between two adjacent mixing cylinders. The boosting mechanism includes a fixed box, which is fixedly arranged between two adjacent mixing cylinders. A feed port and a discharge port are provided on the fixed box. The fixed box is connected with the corresponding mixing cylinder through the feed port and the discharge port respectively, 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 connected with the sliding seal in the side cylinder. When mixing, the boosting mechanism performs segmented boosting of the flow of the material through the sliding suction of the piston.

[0009] In a preferred embodiment, the boosting mechanism further includes a driving assembly, the output end of the driving assembly is equipped with a side plate, a shift shaft is installed on the side plate, a rectangular frame is fixedly provided on one side of the piston, and the rectangular frame is movably provided on the shift shaft.

[0010] In a preferred embodiment, the drive assembly includes a power component, the side plate includes two transverse plates, a rotating shaft is fixedly arranged between the two transverse plates, and bevel gears are fixedly arranged on the output end of the power component and the rotating shaft, and the two bevel gears are meshed.

[0011] In a preferred embodiment, the feed pipe is provided with a gas delivery mechanism, which includes an air delivery pipe, and the feed pipe inputs gaseous medium into the material through the air delivery pipe.

[0012] In a preferred embodiment, the air inlet end of the air supply pipe is connected to the air inlet assembly, the air outlet end of the air supply pipe is connected to the feed pipe, and the air outlet end of the air supply pipe is provided with an anti-backflow assembly.

[0013] 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 provided in the fixed seat, and a vent is provided on the ball. The air supply control mechanism controls the air supply by rotating the ball.

[0014] 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 movable contact with the connecting strip.

[0015] In a preferred embodiment, two limiting plates are fixedly provided on the feed pipe, and both limiting plates are in movable contact with the connecting strip, and the two limiting plates are used to limit the connecting strip.

[0016] In a preferred embodiment, the static mixing device further comprises a cooling mechanism, which comprises a spiral tube fixedly arranged on the outside of the mixing barrel. The cooling mechanism cools the material by injecting a cooling medium into the spiral tube.

[0017] 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 provided on the connecting box, and a one-way valve is provided 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, and a piston plate is connected to the connecting box in a sliding seal, a vertical plate is fixedly provided on one side of the piston plate, and a fixed plate is fixedly provided on the rectangular frame below, and the fixed plate is fixedly connected to the vertical plate.

[0018] The beneficial effects of the present invention are:

[0019] The present application realizes the effect of segmented pressurization by setting a pressurization mechanism between two adjacent mixing barrels, so that the problem of the polyether easily adhering to the spiral blade during the mixing process can be solved by segmented pressurization. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic diagram of the three-dimensional structure of the present application Figure 1 .

[0021] Figure 2 is a schematic diagram of the cross-sectional structure in the front view of the present application Figure 1 .

[0022] Figure 3 is a schematic diagram of another working state of the pressurization mechanism of the present application

[0023] Figure 4 is a schematic diagram of the three-dimensional structure of the present application Figure 2 .

[0024] Figure 5 is a schematic diagram of the gas delivery mechanism of the present application

[0025] Figure 6 is a schematic diagram of the three-dimensional structure of the present application Figure 3 .

[0026] Figure 7 is a schematic diagram of part of the gas delivery control mechanism of the present application Figure 1 .

[0027] Figure 8 is an enlarged view of part A in Figure 7 .

[0028] Figure 9 is a schematic diagram of part of the gas delivery control mechanism of the present application Figure 2 .

[0029] Figure 10 is an enlarged view of part B in Figure 9 .

[0030] Figure 11 is a schematic diagram of another working state of the gas delivery control mechanism of the present application Figure 8 .

[0031] Figure 12 is a schematic diagram of the cross-sectional structure in the front view Figure 2 .

[0032] Figure 13 is a schematic diagram of the cooling mechanism of the present application

[0033] The accompanying drawings are marked as follows: 1. mixing mechanism; 11. mixing cylinder; 111. spiral blade; 12. feed pipe; 13. discharge pipe; 2. pressurizing mechanism; 21. fixing box; 211. feed port; 212. discharge port; 22. side cylinder; 23. piston; 24. side plate; 241. transverse 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; 43. Connecting shaft; 44. Connecting strip; 45. Connecting plate; 46. Elastic part; 47. Limiting 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

[0034] The present application is described in further detail below in conjunction with the accompanying drawings. It is necessary to point out 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. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0035] 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 comprising a plurality of mixing drums 11 connected in sequence in a vertical direction, each of the plurality of mixing drums 11 being provided with a spiral blade 111, a feed pipe 12 being provided at the top end of the topmost mixing drum 11, the feed pipe 12 comprising two feed ends, and a discharge pipe 13 being provided at the bottom end of the bottommost mixing drum 11, the material entering through the two feed ends, and passing through the plurality of vertically connected mixing drums 11 in sequence for mixing, and then being discharged through the discharge pipe 13;

[0036] A boosting mechanism 2 is provided between two adjacent mixing cylinders 11. The boosting mechanism 2 includes a fixed box 21, which is fixedly provided between two adjacent mixing cylinders 11. A feed port 211 and a discharge port 212 are provided on the fixed box 21. The fixed box 21 is connected to the corresponding mixing cylinder 11 through the feed port 211 and the discharge port 212 respectively, and a one-way valve is provided in the feed port 211 and the discharge port 212. A side cylinder 22 connected to the fixed box 21 is provided on the fixed box 21, and a piston 23 is connected to the side cylinder 22 in a sliding seal. When mixing, the boosting mechanism 2 performs segmented boosting on the flow of the material through the sliding suction of the piston 23.

[0037] It should be noted that there are three mixing drums 11, and the three mixing drums 11 are connected in sequence in the vertical direction. The angles of the spiral blades 111 arranged in the three mixing drums 11 are alternately arranged, and are clockwise, counterclockwise and clockwise from top to bottom in the vertical direction. The materials include liquid carbon dioxide and polyether. When feeding, the liquid carbon dioxide and polyether are fed from the two feed ends of the feed pipe 12 through high-pressure metering pumps respectively. The boosting mechanism 2 includes two groups, and the two groups of boosting mechanisms 2 are respectively arranged between two adjacent mixing drums 11. By arranging a boosting mechanism 2 between two adjacent mixing drums 11, the effect of segmented boosting is achieved.

[0038] The specific implementation scenario is as follows: when mixing, liquid carbon dioxide and polyether are fed from the two feed ends of the feed 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. In the process of the flow of liquid carbon dioxide and polyether, a force that sucks the liquid carbon dioxide and polyether from top to bottom is formed, so that it can have a pressurizing effect on the flow and mixing of liquid carbon dioxide and polyether, and increase its flow rate, 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 mixing barrel 11 in the middle 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 mixing barrel 11 in the middle into the mixing barrel 11 at the bottom by suction, so that they can play a segmented boosting effect in the process of flow mixing of the liquid carbon dioxide and polyether. Through its 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 flow due to the long stroke leads to a reduction in their flow rate, which in turn causes the polyether to easily stick to the spiral blade 111 during the mixing process.

[0039] Further, refer to the instructions attached Figure 2 The boosting mechanism 2 also includes a driving assembly 27 , the output end of the driving assembly 27 is installed with a side plate 24 , 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 .

[0040] It should be noted that the driving component 27 can be a motor, which drives the side plate 24 to rotate, so that the side plate 24 can drive the dial shaft 25 to perform orbital motion, so that the dial shaft 25 can drive 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.

[0041] In the above technical solution, since it is necessary to achieve the effect of segmented supercharging, the pistons 23 in the two supercharging mechanisms 2 need to maintain opposite movement directions, so that when the upper piston 23 slides and sucks, the lower piston 23 needs to be in a sliding compression effect to push the liquid carbon dioxide and polyether to flow. To this end, the present invention proposes a specific structure of the drive 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 provided between the two horizontal plates 241. A bevel gear 273 is fixedly provided 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.

[0042] It should be noted that the power component 271 is a motor. When the two bevel gears 273 are in meshing state, the motor drives 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.

[0043] In the above technical solution, since fine bubbles will appear in the process of mixing liquid carbon dioxide and polyether during production, in order to ensure that there are sufficient initiation points for foam formation, a small amount of nucleating gas needs to be input. For this purpose, the present invention also proposes a gas supply mechanism 3 for inputting the gas medium when mixing liquid carbon dioxide and polyether.

[0044] For details, please refer to the attached manual. Figure 4 and Figure 5 The feed pipe 12 is provided with a gas delivery mechanism 3, which 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 the 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.

[0045] 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, but in the system using liquid carbon dioxide as the physical foaming agent, nitrogen is required as the nucleating gas. Moreover, 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 the 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 outlet end of the air supply pipe 31 when nitrogen is input.

[0046] 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 the adhesion of the polyether on the spiral blade 111 can also 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, forming 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 gas, the formation of foam will change the pattern of the fluid and reduce the surrounding liquid. The effective viscosity of the mixing barrel 11 is improved, which means that the fluidity of the fluid is improved and it is not easy to adhere to the spiral blade 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 area of ​​local high viscosity. 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, and the addition of gas can promote the reorganization of small beams of fluid, reduce local polymerization, improve the overall mixing efficiency, and make it difficult for polyether to be retained on the wall of the mixing barrel 11.

[0047] In the above technical solution, 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 upper mixing barrel 11 to the upper fixed box 21, they are then compressed by the sliding of the piston 23, and the liquid carbon dioxide and polyether in the fixed box 21 are transported to the mixing barrel 11 in the middle. 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 upper mixing barrel 11 for a period of time under the input of liquid carbon dioxide and polyether, and this time is sufficient to fill the fixed box 21 with liquid carbon dioxide. 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 thus resulting in a decrease in mixing efficiency. In addition, excessive nitrogen will not make it possible for the bubbles to interact with each other, thereby failing to form a stable initiation point, which will affect the foaming effect of the final foam. For this reason, the present invention also proposes an air supply control mechanism 4 for controlling the air supply so that nitrogen is continuously supplied when the liquid carbon dioxide and polyether flow and mix, and the nitrogen supply is stopped when the liquid carbon dioxide and polyether stay in the mixing barrel 11.

[0048] For details, please refer to the attached manual. Figures 6 to 8 as well as Figure 11 An air supply control mechanism 4 is provided on the air supply pipe 31. The air supply control mechanism 4 includes a fixed seat 41. The fixed seat 41 is fixedly set in the air supply pipe 31, and a ball 42 is rotatably set in the fixed seat 41. The ball 42 is provided with an air vent 421. The air supply control mechanism 4 controls the air supply by rotating the ball 42.

[0049] It should be noted that when the liquid carbon dioxide and the polyether are flowing and mixing, nitrogen can enter the liquid carbon dioxide and the polyether through the vent 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 421, thereby achieving the effect of stopping the delivery of nitrogen. To this end, the present invention also proposes a specific structure for driving the vent 421 to rotate. For details, refer to the attached specification. Figure 6 、 Figure 9 as well as Figure 10A connecting shaft 43 is fixedly provided on the ball 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. A connecting plate 45 is fixedly provided on the rectangular frame 26 above, and a plurality of elastic members 46 are fixedly provided on the connecting plate 45. 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. The two limiting plates 47 are used to limit the connecting strip 44.

[0050] It should be noted that the elastic member 46 is a flexible paddle. When the piston 23 located above slides to the right, the connecting plate 45 can be driven to slide to the right by the rectangular frame 26 located above, and the connecting strip 44 can be toggled by multiple flexible paddles, so that the ball 42 can keep the vent 421 and the air supply pipe 31 in a connected state through the connecting shaft 43. When the piston 23 located above slides to the left, the connecting plate 45 can be driven to slide to the left by the rectangular frame 26 located above, so that the connecting strip 44 can be toggled by 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 an 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. Further, 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 problem caused by excessive nitrogen delivery.

[0051] 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 provided 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 maintain a liquid state, the present invention also proposes a cooling mechanism 5 for cooling the liquid carbon dioxide when it is heated by flowing and mixing, so as to solve the problem that the temperature rise affects the state of carbon dioxide.

[0052] For details, please refer to the attached manual. Figure 12 and Figure 13The static mixing equipment also includes a cooling mechanism 5, which includes a spiral tube 51. The spiral tube 51 is fixedly arranged on the outside of the mixing drum 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. A liquid inlet pipe 53 is provided 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 connected to the connecting box 52 in a sliding seal. A vertical plate 55 is fixedly provided on one side of the piston plate 54. A fixed plate 56 is fixedly provided on the rectangular frame 26 located below. The fixed plate 56 is fixedly connected to the vertical plate 55.

[0053] 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 provided 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 by 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 cooling by the condenser.

[0054] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection 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, a spiral blade (111) being provided in each of the plurality of mixing cylinders (11), 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, the material entering through the two feed ends, and sequentially 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 boosting mechanism (2) is provided between two adjacent mixing cylinders (11), the boosting mechanism (2) comprising a fixed box (21), the fixed box (21) being fixedly provided between the two adjacent mixing cylinders (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 cylinder (11) through the feed port (211) and the discharge port (212), and a one-way valve being provided in each of the feed port (211) and the discharge port (212), the fixed box (21) being provided with a side cylinder (22) connected to the fixed box (21), the side cylinder (22) being slidably and sealingly connected with a piston (23), and when mixing, the boosting mechanism (2) performs segmented boosting on the flow of the material through sliding suction of the piston (23); The boosting mechanism (2) further comprises a driving assembly (27), an output end of the driving assembly (27) is provided with a side plate (24), a shifting shaft (25) is provided 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 shifting shaft (25); The driving assembly (27) includes a power component (271), the side plate (24) includes two transverse plates (241), a rotating shaft (272) is fixedly provided between the two transverse plates (241), and a bevel gear (273) is fixedly provided 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; The feed pipe (12) is provided with a gas delivery mechanism (3), the gas delivery mechanism (3) includes an air delivery pipe (31), and the feed pipe (12) inputs gaseous medium into the material through the air delivery pipe (31); An air supply control mechanism (4) is provided on the air supply pipe (31), and the air supply control mechanism (4) includes a fixed seat (41), the fixed seat (41) is fixedly provided in the air supply pipe (31), and a ball (42) is rotatably provided in the fixed seat (41), and a vent hole (421) is provided on the ball (42). The air supply control mechanism (4) controls air supply through the rotation of the ball (42); A connecting shaft (43) is fixedly provided on the sphere (42), the end of the connecting shaft (43) extends outside the air supply pipe (31) and is 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 movable contact with the connecting strip (44).

2. The static mixing device for producing soft polyurethane foam from liquid carbon dioxide according to claim 1, 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 the feed pipe (12), and the air outlet end of the air supply pipe (31) is provided with an anti-backflow assembly (32).

3. The static mixing device for producing soft polyurethane foam from liquid carbon dioxide according to claim 2, characterized in that: Two limiting plates (47) are fixedly provided on the feed pipe (12), and both limiting plates (47) are in movable contact with the connecting strip (44). The two limiting plates (47) are used to limit the connecting strip (44).

4. The static mixing device for producing soft polyurethane foam from liquid carbon dioxide according to claim 3, 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 barrel (11), and the cooling mechanism (5) cools the material by injecting a cooling medium into the spiral tube (51).

5. The static mixing device for producing flexible polyurethane foam from liquid carbon dioxide according to claim 4, characterized in that: The cooling mechanism (5) further comprises a connecting box (52), wherein 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 provided on the connecting box (52), wherein both the liquid inlet pipe (53) and the liquid inlet end of the spiral tube (51) are provided with a one-way valve, and 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, and a piston plate (54) is connected in a sliding sealing manner in the connecting box (52), and a vertical plate (55) is fixedly provided on one side of the piston plate (54), and a fixed plate (56) is fixedly provided on the rectangular frame (26) located below, and the fixed plate (56) is fixedly connected to the vertical plate (55).

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