Novel stirrer of polyurethane slurry kettle

Abstract

The utility model discloses a novel stirrer of a polyurethane slurry kettle, which comprises a motor, a cylinder body, a stirring shaft and a stirrer positioned in the cylinder body, and the stirrer comprises a first stirrer, a second stirrer and a third stirrer; the first stirrer and the second stirrer are sequentially arranged above the third stirrer from top to bottom in a staggered manner; the third stirrer is positioned at the lowest part of the barrel; a plurality of flow blocking assemblies are arranged in the height direction of the barrel, and the flow blocking assemblies are arranged between every two adjacent first stirrers and between every two adjacent first stirrers and third stirrers; each flow blocking assembly comprises a plurality of flow blocking plates which are evenly distributed in the radial direction of the inner barrel wall of the barrel and fixedly arranged on the inner barrel wall of the barrel, the flow blocking plates extend towards the middle of the barrel, and the ends, away from the barrel, of the flow blocking plates extend towards the first stirrer and the third stirrer to form vertical plates. The spiral blade is located between the vertical plate and the barrel, the edge of the spiral blade is attached to the inner wall of the barrel, and the spiral blade extends towards the flow baffle.

Description

Technical Field

[0001] This utility model belongs to the field of mixing tank technology, specifically relating to a novel agitator for a polyurethane slurry tank. Background Technology

[0002] Polyurethane is a polymer compound that can be made into polyurethane plastics, mainly foamed plastics, polyurethane fibers, spandex, polyurethane rubber, and elastomers. Flexible polyurethane can be used in packaging, sound insulation, and filtration materials; rigid polyurethane can be used in construction, automotive, aerospace, and thermal insulation structural materials; polyurethane elastomers are used in the footwear and medical industries, and can also be used to make adhesives, coatings, and synthetic leather. The production of polyurethane resin generally consists of equipment such as a reactor, condenser, and filter. The stirring type of the reactor is mostly anchor blade or paddle type. Currently, most domestic structures use anchor frame agitators. However, with the development of solvent-free PU, TPU, and water-based PU, products produced by existing polyurethane reactors can no longer meet current process and quality requirements, exhibiting problems such as incomplete reaction, uneven material mixing, high impurity content in the final product, and large particle size requiring frequent manual filter bag replacement. Summary of the Invention

[0003] The purpose of this invention is to provide a novel agitator for polyurethane slurry reactors, which aims to solve the problem of dead zones in the mixing process of traditional slurry reactors, resulting in insufficient mixing.

[0004] To solve the above-mentioned technical problems, the purpose of this utility model is achieved as follows:

[0005] A novel agitator for a polyurethane slurry reactor includes a motor, a cylinder, a stirring shaft, and a stirrer located inside the cylinder. The stirrer includes a first stirrer, a second stirrer, and a third stirrer. The first stirrer and the second stirrer are arranged alternately above the third stirrer from top to bottom. The third stirrer is located at the bottom of the cylinder.

[0006] Multiple flow-blocking assemblies are arranged along the height direction of the cylinder. The flow-blocking assemblies are arranged between two adjacent first agitators and between adjacent first agitators and third agitators. Each flow-blocking assembly includes multiple baffles that are radially distributed and fixed to the inner wall of the cylinder. The baffles extend toward the middle of the cylinder, and a vertical plate extends toward the first agitator and the third agitator from one end away from the cylinder. Spiral blades are symmetrically arranged on the first agitator. The spiral blades are located between the vertical plate and the cylinder, with their edges close to the inner wall of the cylinder. The spiral blades extend toward the baffles.

[0007] Based on the above scheme and as a preferred embodiment of the above scheme: the first stirrer includes a main stirrer and a first inclined blade, the first inclined blade being arranged along the length direction of the main stirrer; the end of the main stirrer is close to the inner circumferential surface of the cylinder and is provided with a spiral blade; the second stirrer is symmetrically arranged radially with at least one set of second inclined blades, the second inclined blades being staggered with the first inclined blade.

[0008] Based on the above scheme and as a preferred embodiment of the above scheme: both the first inclined blade and the second inclined blade are strip-shaped.

[0009] Based on the above scheme and as a preferred embodiment of the above scheme: the first inclined blade and the second inclined blade are located near the middle of the cylinder.

[0010] Based on the above scheme and as a preferred embodiment of the above scheme: the first inclined blade and the second inclined blade are inclined downward and towards the middle of the cylinder.

[0011] Based on the above scheme and as a preferred embodiment of the above scheme: the stirring blades of the third stirrer are close to the bottom of the cylinder and the ends extend toward the baffle plate.

[0012] Based on the above scheme and as a preferred embodiment of the above scheme: the second stirrer at the bottom is closest to the third stirrer, and the lower end of the second inclined blade near the third stirrer extends toward the concave part of the third stirrer.

[0013] Based on the above scheme and as a preferred embodiment of the above scheme: the third agitator is an anchor agitator.

[0014] Based on the above scheme and as a preferred option of the above scheme: the bottom of the cylinder (14) is an arc surface.

[0015] The significant and beneficial technical effects of this invention compared to existing technologies are as follows: By setting multiple layers of baffle components along the height direction of the cylinder, each baffle component includes multiple baffle plates and extending vertical plates, and a propeller blade is set on the first agitator, with the blade edge of the propeller blade located between the vertical plate and the cylinder wall, a turbulent region is created near the baffle plates. Since multiple baffle plates are arranged radially along the cylinder, annular turbulent regions are formed at multiple height positions within the cylinder. Combined with the first and second inclined blades of the first and second agitators, when the motor rotates through the stirring shaft, it drives the mixture inside the cylinder downwards. When the mixture reaches the bottom of the cylinder, it is stirred upwards by the third agitator. At this time, the mixture rotates and rises, passing through the turbulent region near the baffle plates. This process ensures thorough mixing and turbulent impact between the mixtures, resulting in more uniform and finer particle sizes. The presence of the propeller blades further enhances the upward force and flow velocity of the mixture, thus strengthening turbulence and creating a rotating annular reflux state within the cylinder. This allows the mixture to achieve the required mixing quality in a shorter time, improving production efficiency. Simultaneously, the first and second inclined blades are located near the center of the cylinder, and their downward and inclination towards the center ensures that the mixture near the stirring shaft also flows freely and participates in the mixing process. This achieves thorough and efficient mixing without dead zones, while also improving the uniformity of the mixed products and effectively controlling the particle size, contributing to improved product quality in later stages. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the given embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] In the description of this application, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application 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 application.

[0019] In the description of this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0020] See details Figure 1 As shown, this application discloses a novel agitator for a polyurethane slurry reactor, including a motor 1, a reducer 2, a transmission support 3, a shaft seal 4, a quick-opening manhole 5, a cylinder support 6, a cylinder 14, an agitator shaft 15, and an agitator located inside the cylinder 14. The quick-opening manhole 5 is disposed on the cylinder 14. The agitator includes a first agitator 7, a second agitator 9, and a third agitator 10. The first agitator 7 and the second agitator 9 are arranged alternately above the third agitator 10 from top to bottom. The third agitator 10 is located at the bottom of the cylinder 14.

[0021] like Figure 1As shown, multiple baffle assemblies are arranged along the height direction of the cylinder 14. The baffle assemblies are arranged between two adjacent first stirrers 7 and between adjacent first stirrers 7 and third stirrers 10. Each baffle assembly includes multiple baffle plates 8 that are radially distributed and fixed to the inner wall of the cylinder 14. The baffle plates 8 extend towards the middle of the cylinder 14, and the end away from the cylinder 14 extends towards the first stirrer 7 and the third stirrer 10 with a vertical plate 81. Specifically, the first stirrer 7 includes a main stirrer 73, a first inclined blade 72, and symmetrically arranged spiral blades 71. The first inclined blades 72 are arranged along the length direction of the main stirrer 73. The end of the main stirrer 73 is close to the inner circumferential surface of the cylinder 14. The spiral blades 71 are located at the end of the main stirrer 73 and their outermost edges are close to the inner circumferential surface of the cylinder 14. The spiral blades 71 are located between the vertical plate 81 and the cylinder 14, and the spiral blades 71 extend towards the baffle plate 8. The second agitator 9 includes a second main agitator 92 and a second inclined blade 91. In this embodiment, the second inclined blade 91 is preferably staggered with the first inclined blade 72. In this embodiment, the lowermost second agitator 9 is closest to the third agitator 10, and the lower end of the second inclined blade 91 adjacent to the third agitator 10 extends into the concave part of the third agitator 10. Furthermore, the agitator blades of the third agitator 10 are close to the bottom of the cylinder 14 and the end 101 extends towards the baffle 8. For example, an anchor agitator can be used, and preferably the bottom of the cylinder 14 is curved. By assembling multiple layers of baffles along the height of the cylinder, each baffle assembly includes multiple baffles and extending vertical plates. A propeller blade is mounted on the first agitator, with its blade edge located between the vertical plate and the cylinder wall. This creates a turbulent region near the baffles. Since multiple baffles are arranged radially along the cylinder, annular turbulent regions are formed at multiple height positions within the cylinder. The first and second inclined blades of the first and second agitators, when the motor rotates via the agitator shaft, drive the mixture within the cylinder downwards. Upon reaching the bottom of the cylinder, a third agitator stirs it upwards. The mixture then rotates and rises, passing through the turbulent region near the baffles, ensuring thorough mixing and turbulent impact between particles, resulting in a more uniform and finer particle size. Furthermore, the presence of the propeller blades further enhances the upward force and velocity of the rotating mixture, thus strengthening the turbulence and creating a rotating annular reflux state within the cylinder (see...). Figure 1 The arrows in the diagram indicate the direction of mixture flow, which allows the mixture to achieve the required blending quality in a shorter time, thus improving production efficiency.

[0022] Furthermore, in this embodiment, both the first inclined blade 72 and the second inclined blade 91 are preferably strip-shaped, and the first inclined blade 72 and the second inclined blade 91 are located near the middle of the cylinder 14. Conventional mixers often experience slow mixture flow near the mixing shaft (i.e., the central area of ​​the cylinder), resulting in insufficient mixing. Therefore, in this embodiment, the first inclined blade 72 and the second inclined blade 91 are preferably inclined downwards and towards the middle of the cylinder 14, thereby allowing the mixture near the mixing shaft 15 to flow sufficiently and participate in the mixing process.

[0023] As described above, this application achieves seamless and efficient mixing; at the same time, it improves the uniformity of the mixed products, effectively controls the particle size of the mixture, and helps to improve the quality of subsequent products.

[0024] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A novel agitator for a polyurethane slurry reactor, comprising a motor (1), a cylinder (14), a stirring shaft (15), and an agitator located within the cylinder (14), characterized in that: The stirrer includes a first stirrer (7), a second stirrer (9) and a third stirrer (10); the first stirrer (7) and the second stirrer (9) are arranged alternately above the third stirrer (10) from top to bottom; the third stirrer (10) is located at the bottom of the cylinder (14); Multiple flow-blocking components are provided along the height direction of the cylinder (14). The flow-blocking components are provided between two adjacent first agitators (7) and between adjacent first agitators (7) and third agitators (10). Each flow-blocking component includes multiple flow-blocking plates (8) that are radially distributed and fixed on the inner wall of the cylinder (14). The flow-blocking plates (8) extend toward the middle of the cylinder (14), and one end away from the cylinder (14) extends toward the first agitator (7) and the third agitator (10) with a vertical plate (81). The first agitator (7) is symmetrically provided with spiral blades (71). The spiral blades (71) are located between the vertical plate (81) and the cylinder (14) and their edges are close to the inner wall of the cylinder (14). The spiral blades (71) extend toward the flow-blocking plates (8).

2. The novel agitator for a polyurethane slurry reactor according to claim 1, characterized in that: The first stirrer (7) includes a main stirrer (73) and a first inclined blade (72), the first inclined blade (72) being arranged along the length of the main stirrer (73); the second stirrer (9) is symmetrically arranged in the radial direction with at least one set of second inclined blades (91), the second inclined blades (91) being staggered with the first inclined blades (72).

3. The novel agitator for a polyurethane slurry reactor according to claim 2, characterized in that: Both the first inclined blade (72) and the second inclined blade (91) are strip-shaped.

4. The novel agitator for a polyurethane slurry reactor according to claim 3, characterized in that: The first inclined blade (72) and the second inclined blade (91) are located near the middle of the cylinder (14); the helical blade (71) has a helical angle.

5. The novel agitator for a polyurethane slurry reactor according to claim 4, characterized in that: The first inclined blade (72) and the second inclined blade (91) are inclined downward and inclined toward the middle of the cylinder (14).

6. A novel agitator for a polyurethane slurry reactor according to claim 5, characterized in that: The stirring blades of the third stirrer (10) are close to the bottom of the cylinder (14) and extend towards the baffle (8) at their ends.

7. A novel agitator for a polyurethane slurry reactor according to claim 6, characterized in that: The second stirrer (9) at the bottom is closest to the third stirrer (10), and the lower end of the second inclined blade (91) near the third stirrer (10) extends into the concave part of the third stirrer (10).

8. The novel agitator for a polyurethane slurry reactor according to claim 7, characterized in that: The third agitator (10) is an anchor agitator.

9. A novel agitator for a polyurethane slurry reactor according to claim 7, characterized in that: The bottom of the cylinder (14) is curved.

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