Condensing device for producing polyurethane adhesive

Abstract

The utility model discloses a kind of condensing devices for producing polyurethane adhesive, it is related to condensing device technical field, including the shell assembly consisting of pipe shell main body, flange baffle, plugging pipe cap, liquid inlet, liquid outlet, the pipe shell main body is provided with heat exchange component inside, the heat exchange component is used to provide flow channel for cooling medium, realize and the heat exchange operation of gas phase material inside pipe shell main body. The utility model can realize the double spiral flow of cooling medium and gas phase medium by setting heat exchange component, gas phase material flows along spiral trajectory, compared with the traditional "S" shape baffle, effectively avoid flow dead angle, so that cooling medium and gas phase medium can be fully heat exchanged, and compared with the traditional straight heat exchange pipe, in the case where the horizontal length of pipe shell main body remains unchanged, heat exchange path is longer, in turn reach in the case where the pipe shell main body remains shorter, can realize better, more efficient condensing effect.

Description

Technical Field

[0001] This utility model relates to the field of condensation device technology, specifically a condensation device for producing polyurethane adhesives. Background Technology

[0002] The production of polyurethane adhesives is essentially a chemical reaction process. Its core is to synthesize polyols and isocyanates into polyurethane prepolymers or final products with specific properties through precise processes. The production of polyurethane adhesives usually includes the following steps: raw material preparation and pretreatment → prepolymer synthesis (core reaction process) → dilution and formulation (applicable to solvent-based or specific types) → curing and filtration → testing and packaging. In the production of polyurethane adhesives, the condenser is a key auxiliary device connected to the reactor. It is usually used in conjunction with a vacuum system. Its core function is to perform heat exchange, cooling gaseous substances back to the liquid phase. It mainly undertakes the following three key tasks: Moisture capture during raw material dehydration: In the early stages of production, raw materials such as polyols need to be dehydrated at high temperatures (e.g., 100-120℃) and high vacuum. At this time, the moisture in the raw materials and in the reactor space will evaporate into water vapor. The condenser (usually using low-temperature water, such as cold water at 5-15℃) condenses this water vapor into liquid water and captures it in the receiving tank. Solvent recovery and reflux during the reaction: In the production of solvent-based polyurethane adhesives or when using solvent azeotropic dehydration, the solvent is heated and vaporized. The condenser condenses the vaporized solvent vapor into liquid. Initially, all the condensed solvent is returned to the reactor to maintain a stable composition and liquid level in the reaction system. During azeotropic dehydration (e.g., when toluene, xylene, and water form an azeotrope), the vaporized azeotrope is condensed and enters a water separator. The solvent and water separate due to their different densities. The upper organic phase (solvent) automatically returns to the reactor, while the lower water layer is separated and discharged. This efficiently removes moisture generated during the reaction or introduced by the raw materials. Controlling the reaction environment and reducing material loss: The isocyanates (such as TDI) or some low-boiling-point solvents used in the reaction are volatile and have an irritating odor. The condenser can condense these volatile materials and return them to the reactor, thereby ensuring accurate proportioning.

[0003] Shell-and-tube condensers are commonly used condensing devices in the production of polyurethane adhesives due to their robust structure, large heat exchange area, and strong adaptability, especially as the first choice for use with reaction vessels. However, shell-and-tube condensers also have the following problems in practical use: There is a dead flow angle at the contact point between the baffle and the shell body. In addition, most of the heat exchange tubes are set in a straight line. In order to ensure sufficient condensation, a longer shell is needed to install a longer heat exchange tube. Based on this, in order to reduce dead flow angles and achieve more efficient condensation while maintaining a shorter tube length, a condensation device for producing polyurethane adhesives is provided. Utility Model Content

[0004] The purpose of this invention is to provide a condensation device for producing polyurethane adhesives in order to solve the problems mentioned above.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a condensation device for producing polyurethane adhesive, comprising an outer shell assembly consisting of a shell body, flange partitions, sealing caps, an inlet pipe, and an outlet pipe. The two ends of the shell body are fixedly connected to two sealing caps respectively through flange partitions. The inlet pipe and outlet pipe are fixed to the ends of the two sealing caps and communicate with the inner cavity of the sealing caps. A heat exchange assembly is provided inside the shell body. The heat exchange assembly is used to provide a flow channel for the cooling medium to realize heat exchange with the gaseous substances inside the shell body. The heat exchange assembly includes a spiral guide plate, a central shaft, a spiral heat exchange tube, and a connecting straight tube; The central shaft is fixed to the center of the spiral guide plate and protrudes from both ends of the spiral guide plate. The spiral guide plate and the central shaft are distributed as a whole on the inner side of the tube shell body. The two ends of the central shaft are fixed to the flange partition. The outer side of the spiral guide plate is in contact with the inner side of the tube shell body, which is used to form a spiral channel for the flow of gaseous substances in the tube shell body, thereby avoiding the occurrence of flow dead zones. The connecting straight pipe is fixed to both ends of the spiral heat exchange tube, the spiral heat exchange tube is distributed inside the threaded channel, the connecting straight pipe passes through two flange partitions and communicates with the inner cavity of the sealing cap, and the connecting straight pipe and the flange partitions are fixedly arranged; Spiral heat exchange tubes are used to achieve spiral flow of the cooling medium. The spiral flow of the cooling medium and the spiral flow of the gaseous substance are used to exchange heat, so as to achieve more efficient condensation under shorter length conditions.

[0006] As a further embodiment of this utility model: an air inlet is fixed at one end of the top of the tube shell body, and a discharge outlet is fixed at the other end of the bottom of the tube shell body. The air inlet and the discharge outlet are connected to the inner cavity of the tube shell body and to both ends of the spiral channel.

[0007] As a further improvement of this utility model, the spiral heat exchange tubes are arranged in multiple sets from the inside to the outside with the central axis as the center, and the spiral diameter increases sequentially from the inside to the outside.

[0008] As a further improvement of this utility model: each group of spiral heat exchange tubes is distributed in a ring around the central axis, and there is a spatial gap between two adjacent spiral heat exchange tubes.

[0009] As a further embodiment of this utility model: the central shaft has a hollow structure in the middle and extends through both ends of the central shaft, and both ends of the central shaft extend through the flange partition and are respectively connected to the inner cavities of the two sealing caps.

[0010] Compared with the prior art, the beneficial effects of this utility model are: By setting up heat exchange components, a dual spiral flow of cooling medium and gaseous medium can be achieved. The gaseous substance flows along the spiral trajectory, which effectively avoids flow dead zones compared to the traditional "S"-shaped baffle flow. This allows the cooling medium and gaseous medium to exchange heat fully. Moreover, compared to traditional straight heat exchange tubes, the heat exchange path is longer while keeping the horizontal length of the tube shell unchanged. As a result, better and more efficient condensation effect can be achieved while keeping the tube shell shorter. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a structural cross-sectional view of the outer shell assembly of this utility model; Figure 3 This is a schematic diagram of the heat exchange component of this utility model; Figure 4 This is a split diagram of the heat exchange component of this utility model.

[0012] In the diagram: 1. Outer shell assembly; 101. Shell body; 102. Air inlet; 103. Material outlet; 104. Flange partition; 105. Sealing cap; 106. Liquid inlet; 107. Liquid outlet; 2. Heat exchange assembly; 201. Spiral guide plate; 202. Central shaft; 203. Spiral heat exchange tube; 204. Connecting straight pipe. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] Please see Figures 1-4In this embodiment of the present invention, a condensation device for producing polyurethane adhesive includes an outer shell assembly 1 consisting of a shell body 101, a flange partition 104, a sealing cap 105, an inlet pipe 106, and an outlet pipe 107. The two ends of the shell body 101 are fixedly connected to two sealing caps 105 respectively through the flange partition 104. The inlet pipe 106 and the outlet pipe 107 are fixed to the ends of the two sealing caps 105 and communicate with the inner cavity of the sealing caps 105. A heat exchange assembly 2 is provided inside the shell body 101. The heat exchange assembly 2 is used to provide a flow channel for the cooling medium and realize the heat exchange operation with the gaseous substances inside the shell body 101. The heat exchange assembly 2 includes a spiral guide plate 201, a central shaft 202, a spiral heat exchange tube 203, and a connecting straight tube 204; The central shaft 202 is fixed to the center of the spiral guide plate 201 and protrudes from both ends of the spiral guide plate 201. The spiral guide plate 201 and the central shaft 202 are distributed as a whole on the inner side of the tube shell body 101. The two ends of the central shaft 202 are fixedly installed with the flange partition 104. The outer side of the spiral guide plate 201 is in contact with the inner side of the tube shell body 101, which is used to form a spiral channel for the flow of gaseous substances in the tube shell body 101, thereby avoiding the occurrence of flow dead zones. The connecting straight pipe 204 is fixed to both ends of the spiral heat exchanger tube 203. The spiral heat exchanger tube 203 is distributed inside the threaded channel. The connecting straight pipe 204 passes through the two flange partitions 104 and communicates with the inner cavity of the sealing cap 105. The connecting straight pipe 204 and the flange partitions 104 are fixedly arranged. The spiral heat exchange tube 203 is used to realize the spiral flow of the cooling medium. The spiral flow of the cooling medium and the spiral flow of the gas phase material are used to exchange heat, so as to achieve a more efficient condensation effect under the condition of shorter length. An air inlet 102 is fixed at one end of the top of the tube body 101, and a discharge outlet 103 is fixed at the other end of the bottom of the tube body 101. The air inlet 102 and the discharge outlet 103 are connected to the inner cavity of the tube body 101 and to both ends of the spiral channel.

[0015] In this embodiment, the operating principle of this condensation device is as follows: The gaseous substances generated during the production of polyurethane adhesives are transported to the interior of the casing body 101 through the air inlet 102, and then flow along the spiral channel trajectory formed by the spiral guide plate 201 and the casing body 101. Meanwhile, the cooling medium enters a sealing cap 105 through the liquid inlet 106, then enters the spiral heat exchange tube 203, then flows into another sealing cap 105, and finally flows out through the liquid outlet 107. During this process, the cooling medium flowing spirally along the spiral heat exchange tube 203 exchanges heat with the gaseous substance flowing spirally in the tube shell body 101, thereby realizing the condensation operation of the gaseous substance. In the above process, the gaseous substance flows along a spiral trajectory, which effectively avoids dead flow angles compared to the traditional "S"-shaped flow. The double spiral flow of the cooling medium and the gaseous medium allows for sufficient heat exchange between them. Compared to traditional straight heat exchange tubes, the heat exchange path is longer while the horizontal length of the tube body 101 remains unchanged. This results in a better and more efficient condensation effect while keeping the tube body 101 relatively short.

[0016] Please refer to this carefully. Figures 2-4 The spiral heat exchange tubes 203 are arranged in multiple sets from the inside to the outside with the central axis 202 as the center, and the spiral diameter increases sequentially from the inside to the outside. Each group of spiral heat exchange tubes 203 is distributed in a ring around the central axis 202, and there is a spatial gap between two adjacent spiral heat exchange tubes 203. The central shaft 202 has a hollow structure in the middle and extends through both ends of the central shaft 202. Both ends of the central shaft 202 extend through the flange partition 104 and are respectively connected to the inner cavity of the two sealing caps 105.

[0017] In this embodiment: by setting up multiple sets of spiral heat exchange tubes 203 distributed from the inside out with progressively increasing spiral diameters, and by setting up a hollow structure for the central shaft 202, uniform heat exchange in all directions can be achieved for the inner cavity of the tube shell body 101. Furthermore, the structure with a spatial gap between the two spiral heat exchange tubes 203 allows the gaseous medium to flow around each spiral heat exchange tube 203, ensuring sufficient contact between the gaseous medium and the spiral heat exchange tubes 203.

[0018] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A condensing device for producing polyurethane adhesive, comprising an outer shell assembly (1) consisting of a shell body (101), a flange partition (104), a sealing cap (105), an inlet pipe (106), and an outlet pipe (107), wherein the two ends of the shell body (101) are fixedly connected to two sealing caps (105) respectively via the flange partition (104), and the inlet pipe (106) and outlet pipe (107) are fixed to the ends of the two sealing caps (105) and communicate with the inner cavity of the sealing caps (105), characterized in that, The shell body (101) is provided with a heat exchange component (2), which is used to provide a flow channel for the cooling medium and realize the heat exchange operation with the gaseous substances inside the shell body (101). The heat exchange assembly (2) includes a spiral guide plate (201), a central shaft (202), a spiral heat exchange tube (203), and a connecting straight tube (204). The central shaft (202) is fixed to the center of the spiral guide plate (201) and protrudes from both ends of the spiral guide plate (201). The spiral guide plate (201) and the central shaft (202) are distributed as a whole on the inner side of the shell body (101). The two ends of the central shaft (202) are fixedly set with the flange partition (104). The outer side of the spiral guide plate (201) is in contact with the inner side of the shell body (101) to form a spiral channel for the flow of gaseous substances in the shell body (101), thereby avoiding the occurrence of flow dead zones. The connecting straight pipe (204) is fixed at both ends of the spiral heat exchange tube (203). The spiral heat exchange tube (203) is distributed inside the threaded channel. The connecting straight pipe (204) passes through two flange partitions (104) and communicates with the inner cavity of the sealing cap (105). The connecting straight pipe (204) and the flange partitions (104) are fixedly arranged. The spiral heat exchange tube (203) is used to realize the spiral flow of the cooling medium. The spiral flow of the cooling medium and the spiral flow of the gas phase material are used to exchange heat, so as to achieve a more efficient condensation effect under the condition of shorter length.

2. The condensation apparatus for producing polyurethane adhesives according to claim 1, characterized in that, An air inlet (102) is fixed at one end of the top of the shell body (101), and a discharge outlet (103) is fixed at the other end of the bottom of the shell body (101). The air inlet (102) and the discharge outlet (103) are connected to the inner cavity of the shell body (101) and to both ends of the spiral channel.

3. A condensation apparatus for producing polyurethane adhesives according to claim 1, characterized in that, The spiral heat exchange tube (203) is arranged in multiple sets from the inside to the outside with the central axis (202) as the center, and the spiral diameter increases sequentially from the inside to the outside.

4. A condensation apparatus for producing polyurethane adhesives according to claim 3, characterized in that, Each set of spiral heat exchange tubes (203) is arranged in a ring around the central axis (202), and there is a spatial gap between two adjacent spiral heat exchange tubes (203).

5. A condensation apparatus for producing polyurethane adhesives according to claim 1, characterized in that, The central shaft (202) has a hollow structure in the middle and extends through both ends of the central shaft (202). Both ends of the central shaft (202) extend through the flange partition (104) and are respectively connected to the inner cavities of the two sealing caps (105).

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