A cooling device for polyurethane production

Abstract

The present invention relates to the field of cooling technology, and in particular to a cooling device for polyurethane production, comprising a reaction tank and a cooling assembly; the reaction tank comprises a tank body and a cooling jacket, the top of the tank body is provided with an air extraction port, and the center of the bottom is provided with a discharge port; the cooling assembly comprises an air pump, a circulating pump, a buffer tank, a compressor, a compression tank, and a refrigerator, and the refrigerator comprises a first cooling inlet, a first cooling outlet, a second cooling inlet, and a second cooling outlet; the air extraction port, the air pump, the buffer tank, the first cooling inlet, the first cooling outlet, the compressor, the compression tank, and the discharge port are connected to form an internal cooling cycle; the second cooling inlet, the second cooling outlet, the circulating pump, and the cooling jacket are connected to form an external cooling cycle; the present invention can achieve internal and external synchronous cooling by arranging the internal cooling cycle and the external cooling cycle, especially the internal cooling cycle, by utilizing the expansion of compressed nitrogen and entering the tank body from the center of the bottom of the tank body, the compressed gas rapidly expands and absorbs heat, increases the contact area, and simultaneously rapidly cools down.

Description

Technical Field

[0001] The invention relates to the technical field of cooling, in particular to a cooling device for polyurethane production. Background Art

[0002] The full name of polyurethane is polyurethane, which is a general term for macromolecular compounds containing repeating carbamate groups on the main chain. It is formed by the addition polymerization of organic diisocyanates or polyisocyanates with dihydroxy or polyhydroxy compounds. In addition to carbamate, polyurethane macromolecules may also contain ether, ester, urea, biuret and allophanate groups. Polyurethane materials have a wide range of uses and can replace rubber, plastic, nylon and other materials.

[0003] During the processing of polyurethane materials, a high-power boiler is required to heat and melt them. However, since existing raw materials contain a large amount of volatile components, they need to be cooled before forming to a temperature below 20 degrees Celsius to ensure that the volatile components do not overflow. In the existing technology, the polyurethane in the reaction tank is cooled by additional external cooling sleeves and cooling tanks. However, the cooling sleeve cools from the outside to the inside, resulting in a slow internal cooling speed. Adding an additional cooling tank requires cleaning of two tanks, resulting in polyurethane loss, and the polyurethane remaining in the cooling tank also needs to be cleaned, resulting in high usage costs. Therefore, a cooling device for polyurethane production is proposed to avoid excessive cooling time, which may cause volatile component overflow, and avoid excessive usage costs. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a cooling device for polyurethane production which avoids the situation that the cooling time is too long and the overflow of the volatile agent occurs and the use cost is too high.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A cooling device for polyurethane production, comprising a reaction tank and a cooling assembly;

[0007] The reaction tank includes a tank body for containing polyurethane and a cooling jacket sleeved around the outer periphery of the tank body. The top of the tank body is provided with an air extraction port. The bottom of the tank body is funnel-shaped and provided with a discharge port at the center of the bottom. A three-way valve is provided on the discharge port. The three-way valve includes a first interface and a second interface, and the second interface is connected to the outside. The cooling jacket includes a first inlet and a first outlet. A temperature sensor is provided in the tank body.

[0008] The cooling assembly includes an air pump, a circulating pump, a buffer tank, a compressor, a compression tank, and a refrigerator. The refrigerator includes a first cooling inlet, a first cooling outlet, a second cooling inlet, and a second cooling outlet. The air extraction port, the air pump, the buffer tank, the first cooling inlet, the first cooling outlet, the compressor, the compression tank, and the first interface are connected in sequence to form an internal cooling cycle. The first outlet, the second cooling inlet, the second cooling outlet, the circulating pump, and the first inlet are connected in sequence to form an external cooling cycle.

[0009] The compression tank contains compressed nitrogen. When cooling is required, the three-way valve is in a closed state; the refrigerator, the air pump, and the circulation pump are started, and the refrigerator performs refrigeration on the internal cooling cycle and the external cooling cycle; after the air pump evacuates the tank to perform pre-vacuum, the first interface intermittently connects the compression tank to release the compressed and cooled gas, and the polyurethane inside the tank is cooled from the bottom of the tank. The rising gas takes away the heat and reaches the top, where it is pumped back by the air pump and enters the internal cooling cycle for further cooling and use, and the process is repeated; the temperature sensor monitors the temperature of the polyurethane in real time. When the temperature of the polyurethane reaches a preset value, the three-way valve, the refrigerator, and the circulation pump are closed. The air pump continues to work to extract the gas in the tank, then the second interface is opened and the air pump is reversed to press the polyurethane out of the tank.

[0010] Preferably, the buffer tank is further provided with an external interface, and a nitrogen detector is provided in the buffer tank. When the nitrogen detector monitors that the nitrogen ratio in the buffer tank is insufficient, nitrogen is supplemented through the external interface.

[0011] Preferably, a filter element is provided in the buffer tank.

[0012] Preferably, the buffer tank is detachably connected to the air pump and the first cooling inlet.

[0013] Preferably, the polyurethane is pressed out of the tank body and then cleaned. After cleaning is completed, the next reaction is performed. Before the reaction, the air pump is evacuated, the second interface is closed, the first interface is connected to fill the tank body with nitrogen, and the first interface and the air pump stop working.

[0014] Preferably, a first one-way valve is further provided between the compressor and the compression tank.

[0015] Preferably, a second one-way valve is provided between the compression tank and the first interface.

[0016] Preferably, a solenoid valve is provided between the air extraction port and the air pump, and the solenoid valve and the air pump operate synchronously.

[0017] Preferably, there is coolant in the cooling jacket.

[0018] Preferably, the reaction tank further comprises a vibrator, and the vibrator is arranged on the bottom of the tank body;

[0019] The vibrator is turned on when cooling is required and turned off when the polyurethane temperature reaches a preset value.

[0020] The beneficial effects of the present invention are as follows: by setting up an internal cooling cycle and an external cooling cycle, synchronous cooling of the inside and outside can be achieved, especially the internal cooling cycle, by utilizing the expansion of compressed nitrogen and exhausting the gas upward from the bottom center of the tank body, the compressed gas entering the tank body, due to the negative pressure generated by the air pump, the compressed gas enters faster and can also expand quickly to absorb heat, increase the contact area and quickly cool down at the same time, take away the heat inside the polyurethane, and thus achieve rapid cooling, and the nitrogen recovery cycle can be achieved through the internal cooling cycle, and the nitrogen can also avoid the oxidation of the polyurethane, playing a protective effect, and can facilitate the gas to float up on its own during the bottom-up movement. The nitrogen content in the finished polyurethane product is reduced to ensure the effectiveness of use, and the residual nitrogen can also be used as a protective gas to extend the warranty period of the finished polyurethane product. The impact of high-pressure gas prevents the polyurethane from entering the first interface, and combined with intermittent starting, it can further prevent the polyurethane from overflowing. After cooling is completed, the air pump can be reversed to quickly generate air pressure to squeeze out the polyurethane, facilitating the next step of processing and improving efficiency. Due to the use of gas cooling, the polyurethane will not be lost, and the overflow of volatile agents caused by excessive cooling time is avoided. The use of nitrogen is low-cost and can also be recycled to ensure economic efficiency. The compressor can cool most of the extracted nitrogen and compress it into the compression tank for standby use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a simplified structural diagram of a cooling device for polyurethane production according to a specific embodiment of the present invention;

[0022] Explanation of reference numbers: 1. Reaction tank; 11. Tank body; 12. Cooling jacket; 13. Vacuum port; 14. Discharge port; 15. Three-way valve; 16. First interface; 17. Second interface; 18. Vibrator; 2. Cooling assembly; 21. Air pump; 22. Circulation pump; 23. Buffer tank; 231. External interface; 232. Filter element; 24. Compressor; 25. Compression tank; 26. Refrigerator; 261. First cooling inlet; 262. First cooling outlet; 263. Second cooling inlet; 264. Second cooling outlet; 27. First one-way valve; 28. Second one-way valve; 29. ​​Solenoid valve. DETAILED DESCRIPTION

[0023] To illustrate the technical content, achieved objectives and effects of the present invention in detail, the following description is given in conjunction with the embodiments and accompanying drawings.

[0024] Please refer to Figure 1 , a cooling device for polyurethane production, comprising a reaction tank 1 and a cooling assembly 2;

[0025] The reaction tank 1 includes a tank body 11 for containing polyurethane and a cooling jacket 12 sleeved around the outer periphery of the outer tank body 11. The top of the tank body 11 is provided with an air extraction port 13. The bottom of the tank body 11 is funnel-shaped and a discharge port 14 is provided at the center of the bottom. A three-way valve 15 is provided on the discharge port 14. The three-way valve 15 includes a first interface 16 and a second interface 17, and the second interface 17 is connected to the outside. The cooling jacket 12 includes a first inlet and a first outlet. A temperature sensor is provided in the tank body 11.

[0026] The cooling assembly 2 includes an air pump 21, a circulating pump 22, a buffer tank 23, a compressor 24, a compression tank 25, and a refrigerator 26. The refrigerator 26 includes a first cooling inlet 261, a first cooling outlet 262, a second cooling inlet 263, and a second cooling outlet 264. The air extraction port 13, the air pump 21, the buffer tank 23, the first cooling inlet 261, the first cooling outlet 262, the compressor 24, the compression tank 25, and the first interface 16 are connected in sequence to form an internal cooling cycle. The first outlet, the second cooling inlet 263, the second cooling outlet 264, the circulating pump 22, and the first inlet are connected in sequence to form an external cooling cycle.

[0027] The compression tank 25 contains compressed nitrogen. When cooling is required, the three-way valve 15 is in the closed state; the refrigerator 26, the air pump 21, and the circulating pump 22 are started, and the refrigerator 26 performs refrigeration on the internal cooling cycle and the external cooling cycle; after the air pump 21 evacuates the tank body 11 to perform pre-vacuum, the first interface 16 intermittently connects the compression tank 25 to release the compressed and cooled gas, which cools the inside of the polyurethane from the bottom of the tank body 11. The rising gas takes away the heat and reaches the top, where it is withdrawn by the air pump 21 and enters the internal cooling cycle for further cooling and use and is repeated; the temperature sensor monitors the temperature of the polyurethane in real time. When the temperature of the polyurethane reaches a preset value, the three-way valve 15, the refrigerator 26, and the circulating pump 22 are closed, and the air pump 21 continues to work to extract the gas in the tank body 11, then the second interface 17 is opened and the air pump 21 is reversed to press the polyurethane out of the tank body 11.

[0028] From the above description, it can be seen that by setting up an internal cooling cycle and an external cooling cycle, synchronous cooling of the inside and outside can be achieved, especially the internal cooling cycle, which utilizes the expansion of compressed nitrogen and exhausts upward from the bottom center of the tank body 11 to enter the compressed gas in the tank body 11. Due to the negative pressure generated by the air pump 21, the compressed gas enters faster and can also expand quickly to absorb heat, increase the contact area and quickly cool down at the same time, take away the heat inside the polyurethane, and then achieve rapid cooling. In addition, the internal cooling cycle can realize the recovery cycle of nitrogen. At the same time, nitrogen can also avoid the oxidation of polyurethane and play a protective role. In the process of bottom-up movement, it is convenient for the gas to float up on its own. The nitrogen content in the finished polyurethane product is reduced to ensure the use effect, and the residual nitrogen can also be used as a protective gas to extend the warranty period of the finished polyurethane product; the impact of high-pressure gas prevents the polyurethane from entering the first interface 16, and combined with the intermittent start, it can further prevent the polyurethane from overflowing; and after the cooling is completed, the air pump 21 can be reversed to quickly generate air pressure to squeeze out the polyurethane, which is convenient for the next step of processing and improves efficiency; due to the use of gas cooling, the polyurethane will not be lost, and the overflow of the volatile agent caused by the long cooling time is avoided. The use cost of nitrogen is low and it can also be recycled to ensure economic efficiency. The compressor 24 can cool most of the extracted nitrogen and compress it into the compression tank 25 for standby use.

[0029] Furthermore, the buffer tank 23 is further provided with an external interface 231 . A nitrogen detector is provided in the buffer tank 23 . When the nitrogen detector detects that the nitrogen ratio in the buffer tank 23 is insufficient, nitrogen is replenished through the external interface 231 .

[0030] From the above description, it can be seen that nitrogen is replenished through the external interface 231. Since in the actual production process, the second interface 17 is connected to the outside world, once the material is discharged, nitrogen will inevitably overflow, and then it needs to be replenished to reduce the oxygen content in the reaction process, thereby reducing the occurrence of oxidation.

[0031] Furthermore, a filter element 232 is provided in the buffer tank 23 .

[0032] As can be seen from the above description, by setting the filter element 232, the volatile substances in the production process can be filtered and adsorbed through the filter element 232 to avoid affecting the next reaction.

[0033] Furthermore, the buffer tank 23 is detachably connected to the air pump 21 and the first cooling inlet 261 .

[0034] As can be seen from the above description, the buffer tank 23 can be directly replaced when the filter element 232 reaches the end of its service life through the detachable connection of the buffer tank 23, thereby avoiding the structure of the disassembly filter element 232 affecting the sealing of the buffer tank 23.

[0035] Furthermore, the polyurethane is squeezed out of the tank body 11 and then cleaned. After the cleaning is completed, the next reaction is performed. Before the reaction, the air pump 21 is evacuated, the second interface 17 is closed, and the first interface 16 is connected to fill the tank body 11 with nitrogen. The first interface 16 and the air pump 21 stop working.

[0036] It can be seen from the above description that by filling nitrogen in advance, early gas protection can be achieved.

[0037] Furthermore, a first one-way valve 27 is provided between the compressor 24 and the compression tank 25 .

[0038] It can be seen from the above description that the provision of the one-way valve can prevent the compressed gas in the compression tank 25 from flowing back.

[0039] Furthermore, a second one-way valve 28 is provided between the compression tank 25 and the first interface 16 .

[0040] It can be seen from the above description that the provision of the second one-way valve 28 can further prevent the backflow of polyurethane.

[0041] Furthermore, a solenoid valve 29 is provided between the air extraction port 13 and the air pump 21 , and the solenoid valve 29 and the air pump 21 work synchronously.

[0042] As can be seen from the above description, by disposing the solenoid valve 29 , the air inlet 13 and the air pump 21 can be opened and closed, thereby avoiding backflow due to excessive pressure in the buffer tank 23 .

[0043] Furthermore, the cooling jacket 12 contains coolant.

[0044] As can be seen from the above description, by using the coolant in the external cooling cycle, the water cooling efficiency is higher and it is isolated from the tank body 11, so there is no need to consider other mixing issues.

[0045] Furthermore, the reaction tank 1 further includes a vibrator 18, which is disposed on the bottom of the tank body 11;

[0046] The vibrator 18 is turned on when cooling is required, and is turned off when the polyurethane temperature reaches a preset value.

[0047] From the above description, it can be seen that the vibrator 18 can facilitate the rapid discharge of bubbles in the polyurethane, thereby improving the heat exchange efficiency. Example 1

[0048] A cooling device for polyurethane production, comprising a reaction tank 1 and a cooling assembly 2;

[0049] The reaction tank 1 includes a tank body 11 for containing polyurethane and a cooling jacket 12 sleeved around the outer periphery of the outer tank body 11. The top of the tank body 11 is provided with an air extraction port 13. The bottom of the tank body 11 is funnel-shaped and a discharge port 14 is provided at the center of the bottom. A three-way valve 15 is provided on the discharge port 14. The three-way valve 15 includes a first interface 16 and a second interface 17, and the second interface 17 is connected to the outside. The cooling jacket 12 includes a first inlet and a first outlet. A temperature sensor is provided in the tank body 11.

[0050] The cooling assembly 2 includes an air pump 21, a circulating pump 22, a buffer tank 23, a compressor 24, a compression tank 25, and a refrigerator 26. The refrigerator 26 includes a first cooling inlet 261, a first cooling outlet 262, a second cooling inlet 263, and a second cooling outlet 264. The air extraction port 13, the air pump 21, the buffer tank 23, the first cooling inlet 261, the first cooling outlet 262, the compressor 24, the compression tank 25, and the first interface 16 are connected in sequence to form an internal cooling cycle. The first outlet, the second cooling inlet 263, the second cooling outlet 264, the circulating pump 22, and the first inlet are connected in sequence to form an external cooling cycle.

[0051] The compression tank 25 contains compressed nitrogen. When cooling is required, the three-way valve 15 is in the closed state; the refrigerator 26, the air pump 21, and the circulating pump 22 are started, and the refrigerator 26 performs refrigeration on the internal cooling cycle and the external cooling cycle; after the air pump 21 evacuates the tank body 11 to perform pre-vacuum, the first interface 16 intermittently connects the compression tank 25 to release the compressed and cooled gas, which cools the inside of the polyurethane from the bottom of the tank body 11. The rising gas takes away the heat and reaches the top, where it is withdrawn by the air pump 21 and enters the internal cooling cycle for further cooling and use and is repeated; the temperature sensor monitors the temperature of the polyurethane in real time. When the temperature of the polyurethane reaches a preset value, the three-way valve 15, the refrigerator 26, and the circulating pump 22 are closed, and the air pump 21 continues to work to extract the gas in the tank body 11, then the second interface 17 is opened and the air pump 21 is reversed to press the polyurethane out of the tank body 11.

[0052] The buffer tank 23 is further provided with an external interface 231 . A nitrogen detector is provided in the buffer tank 23 . When the nitrogen detector detects that the nitrogen ratio in the buffer tank 23 is insufficient, nitrogen is replenished through the external interface 231 .

[0053] A filter element 232 is disposed in the buffer tank 23 .

[0054] The buffer tank 23 is detachably connected to the air pump 21 and the first cooling inlet 261 .

[0055] After the polyurethane is squeezed out of the tank body 11, it is cleaned. After the cleaning is completed, the next reaction is performed. Before the reaction, the air pump 21 is evacuated, the second interface 17 is closed, and the first interface 16 is connected to fill the tank body 11 with nitrogen. The first interface 16 and the air pump 21 stop working.

[0056] A first one-way valve 27 is further provided between the compressor 24 and the compression tank 25 .

[0057] A second one-way valve 28 is provided between the compression tank 25 and the first interface 16 .

[0058] A solenoid valve 29 is provided between the air extraction port 13 and the air pump 21 , and the solenoid valve 29 and the air pump 21 operate synchronously.

[0059] The cooling jacket 12 contains cooling liquid.

[0060] The reaction tank 1 further includes a vibrator 18, which is disposed on the bottom of the tank body 11;

[0061] The vibrator 18 is turned on when cooling is required, and is turned off when the polyurethane temperature reaches a preset value. Example 2

[0062] A cooling device for polyurethane production, comprising a reaction tank 1 and a cooling assembly 2;

[0063] The reaction tank 1 includes a tank body 11 for containing polyurethane and a cooling jacket 12 sleeved around the outer periphery of the outer tank body 11. The top of the tank body 11 is provided with an air extraction port 13. The bottom of the tank body 11 is funnel-shaped and a discharge port 14 is provided at the center of the bottom. A three-way valve 15 is provided on the discharge port 14. The three-way valve 15 includes a first interface 16 and a second interface 17, and the second interface 17 is connected to the outside. The cooling jacket 12 includes a first inlet and a first outlet. A temperature sensor is provided in the tank body 11.

[0064] The cooling assembly 2 includes an air pump 21, a circulating pump 22, a buffer tank 23, a compressor 24, a compression tank 25, and a refrigerator 26. The refrigerator 26 includes a first cooling inlet 261, a first cooling outlet 262, a second cooling inlet 263, and a second cooling outlet 264. The air extraction port 13, the air pump 21, the buffer tank 23, the first cooling inlet 261, the first cooling outlet 262, the compressor 24, the compression tank 25, and the first interface 16 are connected in sequence to form an internal cooling cycle. The first outlet, the second cooling inlet 263, the second cooling outlet 264, the circulating pump 22, and the first inlet are connected in sequence to form an external cooling cycle.

[0065] The compression tank 25 contains compressed nitrogen. When cooling is required, the three-way valve 15 is in the closed state; the refrigerator 26, the air pump 21, and the circulating pump 22 are started, and the refrigerator 26 performs refrigeration on the internal cooling cycle and the external cooling cycle; after the air pump 21 evacuates the tank body 11 to perform pre-vacuum, the first interface 16 intermittently connects the compression tank 25 to release the compressed and cooled gas, which cools the inside of the polyurethane from the bottom of the tank body 11. The rising gas takes away the heat and reaches the top, where it is withdrawn by the air pump 21 and enters the internal cooling cycle for further cooling and use and is repeated; the temperature sensor monitors the temperature of the polyurethane in real time. When the temperature of the polyurethane reaches a preset value, the three-way valve 15, the refrigerator 26, and the circulating pump 22 are closed, and the air pump 21 continues to work to extract the gas in the tank body 11, then the second interface 17 is opened and the air pump 21 is reversed to press the polyurethane out of the tank body 11.

[0066] The buffer tank 23 is further provided with an external interface 231 . A nitrogen detector is provided in the buffer tank 23 . When the nitrogen detector detects that the nitrogen ratio in the buffer tank 23 is insufficient, nitrogen is replenished through the external interface 231 .

[0067] The buffer tank 23 is detachably connected to the air pump 21 and the first cooling inlet 261 .

[0068] After the polyurethane is squeezed out of the tank body 11, it is cleaned. After the cleaning is completed, the next reaction is performed. Before the reaction, the air pump 21 is evacuated, the second interface 17 is closed, and the first interface 16 is connected to fill the tank body 11 with nitrogen. The first interface 16 and the air pump 21 stop working.

[0069] A first one-way valve 27 is further provided between the compressor 24 and the compression tank 25 .

[0070] A second one-way valve 28 is provided between the compression tank 25 and the first interface 16 .

[0071] A solenoid valve 29 is provided between the air extraction port 13 and the air pump 21 , and the solenoid valve 29 and the air pump 21 operate synchronously.

[0072] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's description and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A cooling device for polyurethane production, characterized in that: Including reaction tank and cooling assembly; The reaction tank includes a tank body for containing polyurethane and a cooling jacket sleeved around the outer periphery of the tank body. The top of the tank body is provided with an air extraction port. The bottom of the tank body is funnel-shaped and provided with a discharge port at the center of the bottom. A three-way valve is provided on the discharge port. The three-way valve includes a first interface and a second interface, and the second interface is connected to the outside. The cooling jacket includes a first inlet and a first outlet. A temperature sensor is provided in the tank body. The cooling assembly includes an air pump, a circulating pump, a buffer tank, a compressor, a compression tank, and a refrigerator. The refrigerator includes a first cooling inlet, a first cooling outlet, a second cooling inlet, and a second cooling outlet. The air extraction port, the air pump, the buffer tank, the first cooling inlet, the first cooling outlet, the compressor, the compression tank, and the first interface are connected in sequence to form an internal cooling cycle. The first outlet, the second cooling inlet, the second cooling outlet, the circulating pump, and the first inlet are connected in sequence to form an external cooling cycle. The compression tank contains compressed nitrogen. When cooling is required, the three-way valve is in a closed state; the refrigerator, the air pump, and the circulation pump are started, and the refrigerator performs refrigeration on the internal cooling cycle and the external cooling cycle; after the air pump evacuates the tank to perform pre-vacuum, the first interface intermittently connects the compression tank to release the compressed and cooled gas, which cools the polyurethane inside the tank from the bottom of the tank. The rising gas takes away the heat and reaches the top, where it is pumped back by the air pump and enters the internal cooling cycle for further cooling and use, and the process repeats; the temperature sensor monitors the temperature of the polyurethane in real time. When the temperature of the polyurethane reaches a preset value, the three-way valve, the refrigerator, and the circulation pump are closed. The air pump continues to work to extract the gas in the tank, then the second interface is opened and the air pump is reversed to press the polyurethane out of the tank. The buffer tank is also provided with an external interface. A nitrogen detector is provided in the buffer tank. When the nitrogen detector detects that the nitrogen ratio in the buffer tank is insufficient, nitrogen is supplemented through the external interface.

2. The cooling device for polyurethane production according to claim 1, characterized in that: A filter element is arranged in the buffer tank.

3. The cooling device for polyurethane production according to claim 2, characterized in that: The buffer tank is detachably connected to the air pump and the first cooling inlet.

4. The cooling device for polyurethane production according to claim 1, characterized in that: After the polyurethane is squeezed out of the tank, it is cleaned. After the cleaning is completed, the next reaction is carried out. Before the reaction, the air pump is evacuated, the second interface is closed, and the first interface is connected to fill the tank with nitrogen. The first interface and the air pump stop working.

5. The cooling device for polyurethane production according to claim 1, characterized in that: A first one-way valve is also provided between the compressor and the compression tank.

6. The cooling device for polyurethane production according to claim 1, characterized in that: A second one-way valve is provided between the compression tank and the first interface.

7. The cooling device for polyurethane production according to claim 1, characterized in that: A solenoid valve is provided between the air extraction port and the air pump, and the solenoid valve and the air pump work synchronously.

8. The cooling device for polyurethane production according to claim 1, characterized in that: The cooling jacket contains cooling liquid.

9. The cooling device for polyurethane production according to claim 1, characterized in that: The reaction tank further comprises a vibrator, which is arranged on the bottom of the tank body; The vibrator is turned on when cooling is required and turned off when the polyurethane temperature reaches a preset value.

Images