Stirring structure of high-viscosity polyether polyol reaction kettle

Abstract

The utility model provides a high-viscosity polyether polyol reaction kettle stirring structure which comprises a cylindrical shell, a liquid inlet is formed in the side wall of the lower end of the shell, a liquid outlet is formed in the side wall of the middle of the shell, a sliding plug and a fixed plug are arranged in the shell, the fixed plug is fixedly connected to the inner wall of the shell, and the sliding plug is fixedly connected to the inner wall of the shell. The upper portion of the shell extends downwards to be provided with a push-pull rod, the push-pull rod penetrates through the fixing plug downwards, the lower end of the push-pull rod is fixedly connected with the sliding plug, the sliding plug and the fixing plug are both fixedly connected with one-way valves which are communicated from bottom to top, and a lower impeller and an upper impeller are arranged below the shell. The lower impeller is located at the liquid inlet, the upper impeller is located at the liquid outlet, a plurality of feeding pipes are arranged on the upper portion of the shell, and the lower ends of the feeding pipes enter a cavity where the upper impeller is located. According to the reaction kettle, materials can be circulated in the reaction kettle, so that the stirring operation of the materials is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of stirring, and particularly to a stirring structure for a high-viscosity polyether polyol reaction kettle. Background Art

[0002] Stirring is to fully mix various materials. The forms of stirring include mechanical stirring, gas stirring, liquid stirring, ultrasonic stirring, etc. The most common form is mechanical stirring, which uses a stirrer to homogenize the materials. The stirring structure of the stirrer is divided into paddle type, turbine type, frame type, anchor type and spiral type.

[0003] In the existing chemical production process, for high-viscosity materials, such as the raw materials for producing polyether polyols, frame type and anchor type stirrers are usually used. However, due to the high viscosity of the materials, the resistance received by the stirring structure is large. Usually, this kind of stirring structure basically stirs at a low speed, and relatively speaking, the efficiency of this stirring is low. Summary of the Invention

[0004] To solve the above problems, the present invention discloses a stirring structure for a high-viscosity polyether polyol reaction kettle, which includes a cylindrical shell. A liquid inlet is provided on the side wall at the lower end of the shell, and a liquid outlet is provided on the side wall in the middle of the shell. A sliding plug and a fixed plug are arranged inside the shell. The fixed plug is fixedly connected to the inner wall of the shell and is located below the liquid outlet. A push rod extends downward from the upper part of the shell. The push rod penetrates downward through the fixed plug, and the lower end is fixedly connected to the sliding plug. One-way valves that conduct upward from bottom to top are fixedly connected to both the sliding plug and the fixed plug. When the sliding plug moves downward under the action of the push rod, the chamber between the sliding plug and the fixed plug is in a negative pressure state, so that the one-way valve on the sliding plug opens, and the material enters the negative pressure chamber. When the sliding plug moves upward, the chamber between the sliding plug and the fixed plug is in a positive pressure state, and the one-way valve on the fixed plug opens, so that the material passes through the fixed plug and is sent out from the liquid outlet. At the same time, the chamber below the sliding plug is in a negative pressure state, and then the material is sucked in from the liquid inlet. In the process of reciprocating the above process, the stirring and homogenization treatment of the material can be realized.

[0005] A lower impeller and an upper impeller are arranged below the shell. The lower impeller is located at the liquid inlet, and the upper impeller is located at the liquid outlet. Under the impact of the material, the lower impeller and the upper impeller rotate, thereby promoting the homogenization of the material, that is, accelerating the stirring of the material.

[0006] A plurality of feed pipes are arranged on the upper part of the shell, and the lower ends of the feed pipes enter the chamber where the upper impeller is located. The advantage of such a design is that when various materials enter the reaction kettle, they impact the upper impeller for preliminary stirring, thereby improving the stirring efficiency. Secondly, by arranging the feed pipes on the stirring structure, the channels opened on the reaction kettle can be reduced, and the production difficulty of the anti-corrosion coating on the inner wall of the reaction kettle can be reduced.

[0007] Preferably, a linear motion mechanism is provided at the upper part of the housing, and the output end of the linear motion mechanism is fixedly connected to the push rod. The linear motion mechanism includes, but is not limited to, an electric cylinder, a hydraulic cylinder, and a pneumatic cylinder.

[0008] Preferably, the lower impeller and the upper impeller have the same structure, and both include a fixed shaft. A rotating sleeve is rotatably fitted on the fixed shaft. A plurality of inclined blades are fixedly connected to the rotating sleeve. A retaining ring is threadedly connected to one end of the rotating sleeve. The rotating sleeve rotates on the fixed shaft, and the structure is simple and easy to implement. A through hole is provided in the middle of the fixed shaft of the upper impeller for the push rod to pass through.

[0009] Preferably, both the liquid inlet and the liquid outlet are composed of a plurality of long and narrow openings. These openings are inclined, and the inclination direction of the openings is opposite to the inclination direction of the blades. The long and narrow openings are for the material to be sent out in a sheet shape, and the opposite inclination direction to the blades is beneficial to improving the stirring efficiency of the material.

[0010] Preferably, the one-way valve includes a cylinder body. A valve plate is snap-fitted at one end of the cylinder body. A baffle is threadedly connected to the other end of the cylinder body. A spring is provided inside the cylinder body. One end of the spring abuts against the baffle, and the other end abuts against the valve plate. That is, when one side of the valve plate is pressed and the spring is compressed, the valve plate and the cylinder body are misaligned, that is, the one-way valve is opened. When the other side of the valve plate is pressed, the valve plate and the cylinder body are closely attached, which instead makes the one-way valve tightly closed.

[0011] Preferably, a flange is fixedly connected to the middle side wall of the housing. It is used to fixedly connect the stirring structure to the reaction kettle.

[0012] The beneficial effects of the present invention are as follows:

[0013] 1. A fixed plug and a sliding plug are provided inside the housing of the stirring structure. One-way valves are provided on both the fixed plug and the sliding plug, and a liquid inlet and a liquid outlet are provided. Under the reciprocating motion of the sliding plug up and down, the material in the reaction kettle can be transported from bottom to top and pressed out from the liquid outlet. Moreover, the long and narrow openings can send the material out in a sheet shape, and the material can be mixed during the falling process. All the materials can participate in the cycle for stirring and mixing.

[0014] 2. A lower impeller and an upper impeller are provided inside the housing. When the material enters and exits the housing, it impacts the lower impeller and the upper impeller respectively to make them rotate. During the rotation process, it will promote the mixing of the material, that is, improve the stirring efficiency.

[0015] 3. A feed pipe is provided. When the material enters the reaction kettle through the feed pipe, it first passes through the upper impeller. That is, during the addition of the material, a preliminary stirring operation is carried out, improving the stirring effect. At the same time, the feed pipe provided on the stirring structure can eliminate the need to set a feed pipe on the reaction kettle, reducing the number of pipe orifices on the reaction kettle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a three-dimensional schematic diagram of the present invention;

[0017] Figure 2 is a lower cross-sectional schematic diagram of the present invention;

[0018] Figure 3 is a cross-sectional schematic diagram of the one-way valve of the present invention;

[0019] Figure 4 is a cross-sectional schematic diagram of the impeller of the present invention;

[0020] Figure 5 is an installation schematic diagram of the present invention.

[0021] LIST OF REFERENCE NUMERALS:

[0022] 1. Liquid inlet; 2. Housing; 3. Liquid outlet; 4. Flange; 5. Feed pipe; 6. Lower impeller; 7. Sliding plug; 8. Push-pull rod; 9. Fixed plug; 10. Upper impeller; 11. Valve plate; 12. Cylinder; 13. Spring; 14. Baffle; 15. Fixed shaft; 16. Rotating sleeve; 17. Blade; 18. Retaining ring; 19. Reaction kettle. DETAILED DESCRIPTION OF THE INVENTION

[0023] The present invention will be further illustrated below in conjunction with the drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the terms "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific component.

[0024] As Figures 1 to 5As shown in the figure, the stirring structure of the high-viscosity polyether polyol reactor includes a cylindrical shell 2. An inlet 1 is provided on the lower side wall of the shell 2, and an outlet 3 is provided on the middle side wall of the shell 2. That is, the material enters the shell 2 from the inlet 1 and is finally sent out from the outlet 3. Stirring is achieved during this process. A sliding plug 7 and a fixed plug 9 are arranged inside the shell 2. The sliding plug 7 and the fixed plug 9 are the same in structure. The fixed plug 9 is fixedly connected to the inner wall of the shell 2 and is located below the outlet 3. A push rod 8 extends downward from the upper part of the shell 2. The push rod 8 penetrates downward through the fixed plug 9, and the lower end is fixedly connected to the sliding plug 7. One-way valves that conduct upward are fixedly connected to both the sliding plug 7 and the fixed plug 9.

[0025] When the stirring structure works, that is, when the push rod 8 extends downward, that is, when the sliding plug 7 moves downward, the one-way valve on the sliding plug 7 opens at this time, and the material below the sliding plug 7 is sucked above the sliding plug 7. At the same time, the one-way valve on the fixed plug 9 remains in a closed state; when the push rod 8 retracts, that is, when the sliding plug 7 moves upward, the one-way valve on the fixed plug 9 is pressed open at this time, and the material above the sliding plug 7 passes through the fixed plug 9 and is finally sent out from the outlet 3. At the same time, a negative pressure appears in the lower chamber of the sliding plug 7, and then the material is sucked in from the inlet 1. By repeating the above steps, the material in the reactor 19 can be circulated, making the material homogeneous.

[0026] A lower impeller 6 and an upper impeller 10 are arranged below the shell 2. The lower impeller 6 is located at the inlet 1, and the upper impeller 10 is located at the outlet 3. That is, when the inlet 1 sucks in the material, the lower impeller 6 is impacted and stirs the material. Before the material is sent out from the outlet 3, it impacts the upper impeller 10 again, further stirring the material.

[0027] Several feed pipes 5 are arranged on the upper part of the shell 2, and the lower ends of the feed pipes 5 enter the chamber where the upper impeller 10 is located. Installing the feed pipes 5 on the stirring structure can reduce the number of pipe orifices on the reactor 19. At the same time, when various materials are sent in through the feed pipes 5, they first enter the chamber where the upper impeller 10 is located, impact the upper impeller 10 and make it rotate, initially realizing the stirring operation.

[0028] A linear motion mechanism is arranged on the upper part of the shell 2, and the output end of the linear motion mechanism is fixedly connected to the push rod 8. The linear motion mechanism includes but is not limited to an electric cylinder, a hydraulic cylinder, and a pneumatic cylinder, realizing the reciprocating motion of the push rod 8.

[0029] The structures of the lower impeller 6 and the upper impeller 10 are the same, and both include a fixed shaft 15. It should be noted here that an axial through-hole is provided on the fixed shaft 15 of the upper impeller 10 for the push-pull rod 8 to pass through. The ancient shaft 15 is fixedly connected to the inner wall of the lower chamber of the housing 2. A rotating sleeve 16 is rotatably fitted on the fixed shaft 15. The rotating sleeve 16 can rotate on the fixed shaft 15. A number of inclined blades 17 are fixedly connected to the rotating sleeve 16. That is, when the material impacts on the blades 17, the blades 17 rotate, which stirs the material. One end of the rotating sleeve 16 is threadedly connected with a retaining ring 18, and the retaining ring 18 restricts the rotating sleeve 16 and the blades 17 on the fixed post 15.

[0030] Both the liquid inlet 1 and the liquid outlet 3 are composed of a number of long and narrow openings. The setting of these long and narrow openings is especially for the material to be ejected in a sheet shape when it is pressed out from the liquid outlet 3, so that the materials can be homogenized with each other during the falling process. The openings are inclined, and the inclined direction of the openings is opposite to the inclined direction of the blades 17, which is also beneficial to the mixing of the materials.

[0031] The one-way valve includes a cylinder body 12, which is installed on the sliding plug 7 or the fixed plug 9. A valve plate 11 is buckled at one end of the cylinder body 12, that is, the valve plate 11 is fitted on the stepped surface preset at the end of the cylinder body 12. The other end of the cylinder body 12 is threadedly connected with a baffle 14, and through-holes are provided on the baffle 14 for the material to pass through. Further, a paddle is provided on the baffle 14, which also has a stirring effect when the material passes through. A spring 13 is arranged inside the cylinder body 12. One end of the spring 13 abuts against the baffle 14, and the other end abuts against the valve plate 11. The spring 13 is used to maintain the relative position between the valve plate 11 and the cylinder body 12. When one side of the valve plate 11 is pressed and the spring 13 is compressed, the valve plate 11 moves, and the one-way valve is in an open state. When the other side of the valve plate 11 is pressed and the valve plate 11 is pressed against the cylinder body 12, the one-way valve is in a closed state.

[0032] A flange 4 is fixedly connected to the middle side wall of the housing 2. An installation structure is provided at the upper part of the reaction kettle 19 where the stirring structure is installed, and the flange 4 is fixedly connected to this installation structure.

[0033] The technical means disclosed in the solution of the present invention are not limited to the technical means disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features.

Claims

1. High viscosity polyether polyol reactor stirring structure, characterized in that: The invention comprises a cylindrical shell (2), wherein a liquid inlet (1) is arranged on the side wall at the lower end of the shell (2), a liquid outlet (3) is arranged on the side wall at the middle of the shell (2), a sliding plug (7) and a fixed plug (9) are arranged inside the shell (2), the fixed plug (9) is fixedly connected to the inner wall of the shell (2) and is located below the liquid outlet (3), a push-pull rod (8) is extended downward from the upper part of the shell (2), the push-pull rod (8) passes through the fixed plug (9) downward, and the lower end is fixedly connected to the sliding plug (7), and a one-way valve that conducts from bottom to top is fixedly connected to both the sliding plug (7) and the fixed plug (9); A lower impeller (6) and an upper impeller (10) are arranged below the housing (2), wherein the lower impeller (6) is located at the liquid inlet (1) and the upper impeller (10) is located at the liquid outlet (3); A plurality of feed pipes (5) are provided at the upper portion of the housing (2), and the lower ends of the feed pipes (5) enter into the chamber where the upper impeller (10) is located.

2. The high viscosity polyether polyol reaction kettle stirring structure according to claim 1, characterized in that: A linear motion mechanism is provided on the upper portion of the housing (2), and an output end of the linear motion mechanism is fixedly connected to a push-pull rod (8).

3. The high viscosity polyether polyol reaction kettle stirring structure according to claim 1, characterized in that: The lower impeller (6) and the upper impeller (10) have the same structure and both comprise a fixed shaft (15), a rotating sleeve (16) being rotatably provided on the fixed shaft (15), a plurality of inclined blades (17) being fixedly connected to the rotating sleeve (16), and a retaining ring (18) being threadedly connected to one end of the rotating sleeve (16).

4. The high viscosity polyether polyol reaction kettle stirring structure according to claim 3, characterized in that: The liquid inlet (1) and the liquid outlet (3) are both composed of a plurality of narrow and long openings, the openings being arranged at an inclination, and the inclination direction of the openings is opposite to the inclination direction of the blades (17).

5. The high viscosity polyether polyol reaction kettle stirring structure according to claim 1, characterized in that: The one-way valve comprises a cylinder (12), one end of the cylinder (12) being buckled with a valve plate (11), the other end of the cylinder (12) being threadedly connected with a baffle plate (14), a spring (13) being arranged inside the cylinder (12), one end of the spring (13) being against the baffle plate (14), and the other end being against the valve plate (11).

6. The high viscosity polyether polyol reaction kettle stirring structure according to claim 1, characterized in that: A flange (4) is fixedly connected to the middle side wall of the shell (2).

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