Polyester polyol reaction kettle

Abstract

The utility model belongs to the technical field of chemical reaction containers, and particularly relates to a polyester polyol reaction kettle which comprises a hollow kettle body, a stirring device and a water cooling device, the stirring device comprises a motor, a rotating shaft, a connecting ring and paddles, the driving end of the motor is connected with one end of the rotating shaft, the other end of the rotating shaft extends into the kettle body, and the connecting ring sleeves the rotating shaft and synchronously rotates with the rotating shaft. Swing arms which are evenly distributed are arranged on the periphery of the connecting ring. And each group of paddles comprises U-shaped flow guide impellers which are symmetrical up and down. And the opening end of the U-shaped flow guide impeller faces the rotating direction of the paddle. A jacket layer is arranged on the periphery of the kettle body, and a water cooling device is arranged in the jacket layer and used for cooling the kettle body. Through the up-down symmetrical layout of the U-shaped flow guide impellers and the design that the opening ends of the U-shaped flow guide impellers face the rotating direction, the bidirectional flow guide effect can be formed, the blade back vortex can be reduced, the radial mixing efficiency of materials in the kettle is remarkably enhanced, the flow dead angle is reduced, and the esterification reaction uniformity is improved.

Description

Technical Field

[0001] This utility model belongs to the field of chemical reaction vessel technology, and in particular relates to a polyester polyol reaction vessel. Background Technology

[0002] In the preparation process of polyester polyols, reaction vessels generally suffer from problems such as low stirring efficiency, insufficient heat transfer, and escape of unreacted materials. For example, existing stirring devices mostly adopt a single-direction blade design, which leads to uneven mixing of reactants and easy generation of dead flow zones, affecting the efficiency of esterification reaction. At the same time, conventional jacketed water-cooling structures are in direct contact with the outer wall of the vessel, and the cylindrical structure of the reaction vessel limits the heat exchange contact area between the inside and outside, making it difficult to achieve rapid cooling. Utility Model Content

[0003] The purpose of this invention is to provide a polyester polyol reactor, which aims to solve the technical problem of uneven mixing of reactants in the prior art.

[0004] To achieve the above objectives, this utility model provides a polyester polyol reactor, comprising a hollow reactor body, a stirring device, and a water cooling device. The upper end of the reactor body has an inlet and an outlet. The stirring device includes a motor, a rotating shaft, a connecting ring, and impellers. The motor is mounted on the upper end of the reactor body, with its drive end connected to one end of the rotating shaft. The other end of the rotating shaft extends into the reactor body. The connecting ring is fitted onto the rotating shaft and rotates synchronously with it. The outer circumference of the connecting ring has evenly distributed swing arms, with impellers connected to the outer sides of the corresponding swing arms. Each set of impellers includes symmetrically mounted U-shaped guide impellers on the upper and lower swing arms. The open end of the U-shaped guide impellers faces the rotation direction of the impellers. The reactor body is surrounded by a jacket layer, within which a water cooling device is installed for cooling the reactor body.

[0005] Furthermore, the edge of the U-shaped guide impeller is toothed.

[0006] Furthermore, the U-shaped guide impeller is provided with reinforcing ribs in the opening direction, and the reinforcing ribs extend toward the radial arc surface of the U-shaped guide impeller.

[0007] Furthermore, one end of the U-shaped guide impeller near the vessel body is connected to the swing arm, while the other end is suspended, creating a gap between the two U-shaped guide impellers.

[0008] Furthermore, the water cooling device includes a condenser tube assembly, an inlet pipe, and an outlet pipe. A water injection chamber is provided inside the jacket layer. The inlet pipe is located at the top of the jacket layer and extends into the water injection chamber, while the outlet pipe is located at the bottom of the jacket layer and extends into the water injection chamber.

[0009] Furthermore, the condenser tube assembly is fixed inside the jacket layer, one end of the water inlet pipe enters the water injection chamber and is connected to the condenser tube assembly, while the other end of the condenser tube assembly is located inside the water injection chamber.

[0010] Furthermore, the connecting ring is formed by the locking connection of ring one and ring two; the inner sidewalls of ring one and ring two are provided with internal gear grooves, and the outer sidewall of the rotating shaft is provided with external gear grooves, and the two mesh and lock together.

[0011] The above-mentioned technical solutions in the polyester polyol reactor provided in this embodiment of the utility model have at least one of the following technical effects:

[0012] This invention utilizes a symmetrical U-shaped impeller with its open end facing the direction of rotation to create a bidirectional flow effect. This reduces vortices on the back of the impeller, improves the gas-carrying capacity of the stirring device, and enhances fluid dispersion and mass transfer. It significantly improves the radial mixing efficiency of materials within the reactor and reduces dead zones, thus increasing the uniformity of the esterification reaction. The jacketed water-cooling device, combined with the annular flow channel design around the reactor body, achieves heat exchange by increasing the contact area of ​​the coolant. The overall structural design balances reaction efficiency optimization with energy consumption control requirements. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 A cross-sectional view of a polyester polyol reactor provided in an embodiment of this utility model;

[0015] Figure 2 A schematic diagram of the stirring device for the polyester polyol reactor provided in an embodiment of this utility model;

[0016] The following are the labeling elements in the figure:

[0017] 100. Kettle body; 110. Feed inlet; 120. Discharge outlet;

[0018] 200. Stirring device; 210. Motor; 220. Rotating shaft; 230. Connecting ring; 231. Ring 1; 232. Ring 2; 233. Internal gear groove; 234. External gear groove; 240. Impeller; 250. U-shaped guide impeller; 251. Tooth edge; 252. Reinforcing rib; 260. Swing arm; 270. Jacket layer;

[0019] 300. Water cooling device; 310. Condenser tube assembly; 320. Water inlet pipe; 330. Water outlet pipe. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings 1-2, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The following description is based on the accompanying drawings. Figure 1-2 The described embodiments are exemplary and intended to explain embodiments of the present invention, and should not be construed as limiting the present invention.

[0021] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0024] In one embodiment of this utility model, a polyester polyol reactor is provided, comprising a hollow reactor body 100, a stirring device 200, and a water cooling device 300. The upper end of the reactor body 100 is provided with an inlet 110 and an outlet 120. The stirring device 200 includes a motor 210, a rotating shaft 220, a connecting ring 230, and impellers 240. The motor 210 is mounted on the upper end of the reactor body 100, and the driving end of the motor 210 is connected to one end of the rotating shaft 220. The other end of the rotating shaft 220 extends into the reactor body 100. The connecting ring 230 is sleeved on the rotating shaft 220 and rotates synchronously with it. The outer periphery of the connecting ring 230 is provided with evenly distributed swing arms 260, and the impellers 240 are connected to the outer sides of the corresponding swing arms 260. Each set of impellers 240 includes U-shaped guide impellers 250 symmetrically mounted on the upper and lower sides of the swing arms 260. The open end of the U-shaped guide impeller 250 faces the rotation direction of the impeller 240. The vessel body 100 is surrounded by a jacket layer 270, and a water cooling device 300 is installed inside the jacket layer 270 for cooling the vessel body 100.

[0025] Specifically, the symmetrical arrangement of the U-shaped guide impeller 250, with its open end facing the direction of rotation, creates a bidirectional flow-guiding effect. This reduces vortices on the back of the blades, suppresses the formation of vortices behind the blades, improves the flow-carrying capacity of the stirring device 200, and enhances fluid dispersion and mass transfer capabilities. It significantly enhances the radial mixing efficiency of materials within the vessel and reduces dead zones, improving the uniformity of the esterification reaction. The jacket layer 270 water cooling device 300, combined with the annular flow channel design around the vessel body 100, achieves heat exchange by increasing the contact area of ​​the coolant. The overall structural design balances reaction efficiency optimization with energy consumption control requirements.

[0026] Furthermore, the edge of the U-shaped guide impeller 250 is toothed 251, and a reinforcing rib 252 is also provided in the opening direction of the U-shaped guide impeller 250, extending radially towards the radial arc surface of the U-shaped guide impeller 250. When the impeller rotates, the toothed edge 251 periodically cuts the fluid, forming micro-turbulence and enhancing radial mixing. The coupling effect between the reinforcing rib 252 and the U-shaped impeller expands the guide coverage area and also enhances the rigidity of the U-shaped guide impeller 250, preventing deformation of the U-shaped guide impeller 250 during high-speed rotation.

[0027] Furthermore, one end of the U-shaped guide impeller 250 near the vessel body 100 is connected to the swing arm 260, while the other end is suspended, creating a gap between the two U-shaped guide impellers 250. A low-pressure zone is formed at the gap, prompting the fluid to form a secondary vortex at the impeller gap, enhancing local mixing.

[0028] Furthermore, the water-cooling device 300 includes a condenser tube assembly 310, a water inlet pipe 320, and a water outlet pipe 330. A water injection chamber is provided inside the jacket layer 270. The water inlet pipe 320 is located at the top of the jacket layer 270 and extends into the water injection chamber, while the water outlet pipe 330 is located at the bottom of the jacket layer 270 and extends into the water injection chamber. Specifically, water is injected into the water injection chamber from the top water inlet pipe 320, flows downwards along the jacket layer 270, absorbs heat from the vessel body 100, and is discharged from the bottom water outlet pipe 330, completing the heat exchange. The water injection chamber structure of the jacket layer 270 can evenly distribute the coolant and avoid localized overheating.

[0029] Furthermore, the condenser tube assembly 310 is fixed within the jacket layer 270. One end of the water inlet pipe 320 enters the water injection chamber and is connected to the condenser tube assembly 310, while the other end of the condenser tube assembly 310 is located within the water injection chamber. The condenser tube assembly 310 is existing technology. Water enters the condenser tube assembly 310 from the top water inlet pipe 320. The condenser tubes further lower the temperature of the water to form cooling water. The cooling water flows within the water injection chamber and exits from the bottom of the water outlet pipe 330, completing the heat exchange.

[0030] Furthermore, the connecting ring 230 is formed by the locking connection of ring one 231 and ring two 232; the inner sidewalls of ring one 231 and ring two 232 are provided with internal gear grooves 233, and the outer sidewall of the rotating shaft 220 is provided with external gear grooves 234, which mesh and lock together. Ring one 231 and ring two 232 are axially locked through gear meshing, and the rotating shaft 220 and the connecting ring 230 rotate synchronously through gear transmission. The split ring structure facilitates installation and maintenance, while enhancing axial load-bearing capacity.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A polyester polyol reaction vessel, characterized in that, The device includes a hollow vessel body, a stirring device, and a water cooling device. The upper end of the vessel body has a feed inlet and a discharge outlet. The stirring device includes a motor, a rotating shaft, a connecting ring, and impellers. The motor is mounted on the upper end of the vessel body, and its drive end is connected to one end of the rotating shaft. The other end of the rotating shaft extends into the vessel body. The connecting ring is sleeved on the rotating shaft and rotates synchronously with it. The outer periphery of the connecting ring has evenly distributed swing arms, and the impellers are connected to the outer sides of the corresponding swing arms. Each set of impellers includes U-shaped guide impellers symmetrically mounted on the upper and lower sides of the swing arms. The open end of the U-shaped guide impellers faces the rotation direction of the impellers. The vessel body has a jacket layer around its periphery, and the water cooling device is located within the jacket layer for cooling the vessel body.

2. The polyester polyol reactor according to claim 1, characterized in that, The edge of the U-shaped guide impeller is toothed.

3. The polyester polyol reactor according to claim 2, characterized in that, The U-shaped guide impeller is also provided with reinforcing ribs in the opening direction, and the reinforcing ribs extend toward the radial arc surface of the U-shaped guide impeller.

4. The polyester polyol reactor according to claim 1, characterized in that, The U-shaped guide impeller is connected to the swing arm at one end near the vessel body, and the other end is suspended, resulting in a gap between the two U-shaped guide impellers.

5. The polyester polyol reactor according to claim 1, characterized in that, The water cooling device includes a condenser tube assembly, a water inlet pipe, and a water outlet pipe. The jacket layer has a water injection chamber inside. The water inlet pipe is located at the top of the jacket layer and extends into the water injection chamber. The water outlet pipe is located at the bottom of the jacket layer and extends into the water injection chamber.

6. The polyester polyol reactor according to claim 5, characterized in that, The condenser tube assembly is fixed inside the jacket layer. One end of the water inlet pipe enters the water injection chamber and is connected to the condenser tube assembly. The other end of the condenser tube assembly is located inside the water injection chamber.

7. The polyester polyol reactor according to claim 1, characterized in that, The connecting ring is formed by locking ring one and ring two together; the inner sidewalls of ring one and ring two are provided with internal gear grooves, and the outer sidewall of the rotating shaft is provided with external gear grooves, and the two mesh and lock together.

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