Sleeve type stirring paddle and stirring equipment

Abstract

The utility model provides a sleeve type stirring paddle and stirring equipment, and relates to the technical field of stirring equipment, the sleeve type stirring paddle comprises a paddle sleeve and at least two paddles arranged on the paddle sleeve; the paddle sleeve is formed by splicing at least two paddle sub-sleeves, and at least one paddle is arranged on each paddle sub-sleeve; and the sections of the paddles in the radial direction of the paddle sleeve are gradually reduced. According to the sleeve type stirring paddle provided by the utility model, the paddle sleeve is sleeved on the stirring shaft, and the sections of the paddles arranged on the paddle sleeve are gradually reduced in the radial direction; due to the fact that the liquid discharge amount of the circular paddles with the same structure in the reaction kettle is gradually increased in the radial direction, when the paddles with the sections gradually decreased in the radial direction are used, the liquid discharge amount area of the paddles in the radial direction is balanced, the stirring stability is improved, the liquid discharge amount and the circulation amount in the stirring process are increased, and the stirring effect is improved. The problem that materials with large density or easy to settle cannot be stirred by push type and turbine type stirring is solved.

Description

Technical Field

[0001] This utility model relates to the technical field of mixing equipment, and in particular to a sleeve-type mixing paddle and mixing equipment. Background Technology

[0002] Currently, in the production process of latex, depending on the type of latex that meets different functional requirements, the viscosity of the polymer solution often increases with the increase of conversion rate during the polymerization reaction. If the stirring is not good, it will cause a decrease in the heat transfer coefficient or local overheating, uneven distribution of materials and catalysts, affecting the quality of the polymerized product, and in severe cases, it will lead to the uncontrolled polymerization reaction process.

[0003] During the operation of the stirring shaft in the reactor, when the rotation speed is too high, the Reynolds number is large, the circumferential flow is dominant with a weaker annular flow, and the actual streamline of the liquid is a spiral composed of both. The liquid flow inside the reactor will become turbulent, forming a vortex near the stirring shaft. This causes the central liquid level to drop, while the liquid level at the inner wall of the reactor rises, forming a funnel shape. The liquid surface in the central part of the reactor is a hyperbolic surface of revolution. At the same time, the liquid at the center of the vortex rotates at almost the same angular velocity as the stirring shaft, similar to a rotating circular solid column, which is a cylindrical rotational zone.

[0004] When a "cylindrical rotating zone" appears inside the reactor, the mixing in this area is very poor, resulting in a longer mixing time and hindering the stirring process; therefore, it is generally necessary to try to reduce the size of this zone. Reducing the impeller diameter can reduce the radius of the "cylindrical rotating zone," but this results in poor stirring performance and the formation of sludge and other phenomena. Utility Model Content

[0005] The purpose of this invention is to provide a sleeve-type stirring paddle and stirring equipment to alleviate the technical problems of poor local mixing in the reactor, which causes a decrease in heat transfer coefficient or local overheating, uneven distribution of materials and catalysts, affects the quality of polymerization products, and in severe cases can lead to the uncontrolled polymerization process.

[0006] This utility model provides a sleeve-type stirring paddle, including a paddle sleeve and at least two paddles disposed on the paddle sleeve;

[0007] The blade sleeve is composed of at least two blade sub-sleeves joined together, and each blade sub-sleeve is provided with at least one blade; and the cross-section of the blade gradually decreases along the radial direction of the blade sleeve;

[0008] The blade is provided with ribs; the blade has a first large surface and a second large surface, the first large surface is used to apply pressure to the material; the second large surface is located on the side of the blade away from the first large surface, the ribs are located on the second large surface, and the height of the ribs decreases radially from the blade sleeve.

[0009] In an optional embodiment, the angle between the cross section of at least part of the paddle and the horizontal plane gradually increases along the radial direction of the paddle sleeve.

[0010] And / or, the width of the cross section of at least part of the paddle gradually decreases along the radial direction of the paddle.

[0011] In an optional embodiment, the paddle sleeve is provided with an assembly hole for assembly on the stirring shaft, and a positioning key is arranged in the assembly hole.

[0012] A positioning screw hole is arranged on at least one of the paddle sleeves, and a positioning screw is arranged in the positioning screw hole, which is used to abut against the stirring shaft.

[0013] In an optional embodiment, the paddle sleeve is provided with a first connecting plate, and the paddle is detachably connected with the first connecting plate.

[0014] In an optional embodiment, the first connecting plate is provided with a plurality of first mounting holes, the paddle comprises a paddle body and a second connecting plate, the second connecting plate is arranged at one end of the paddle body, and the second connecting plate is provided with a second mounting hole capable of coinciding with the first mounting hole.

[0015] In an optional embodiment, the radial length of the rib on the paddle is not greater than one half of the radial length of the paddle, and / or the radial length of the rib on the paddle is not less than one third of the radial length of the paddle.

[0016] In an optional embodiment, the first large surface is an arc surface.

[0017] The paddle sleeve of the sleeve type stirring paddle is sleeved on the stirring shaft, and the cross section of the paddle arranged on the paddle sleeve gradually decreases in the radial direction. Since the reaction kettle is circular, the liquid discharge capacity of the paddle with the same structure gradually increases in the radial direction. When the paddle with the cross section gradually decreasing in the radial direction is used, the liquid discharge capacity of the paddle in the radial direction is balanced, the stability of stirring is improved, the liquid discharge capacity and the circulation capacity in the stirring process are increased, the problem that the propeller type and turbine type stirring cannot stir materials with large density or materials prone to sedimentation is solved, and the formation of the "cylindrical rotation zone" is destroyed.

[0018] The utility model provides a kind of stirring equipment, including reaction kettle and the sleeve type stirring paddle of any one of preceding embodiment;

[0019] The upper end of the reaction kettle is provided with a driving device, and the stirring shaft is arranged on the driving device. The stirring shaft extends into the reaction kettle.

[0020] A positioning support is arranged in the reaction kettle, and the end of the stirring shaft away from the driving device is assembled on the positioning support.

[0021] One or more of the sleeve-type stirring paddles are mounted on the stirring shaft.

[0022] In an optional embodiment, an auxiliary support frame is provided inside the reactor, and the stirring shaft is rotatably mounted on the auxiliary support frame.

[0023] Compared with the prior art, the mixing device provided by this utility model has the sleeve-type mixing blade provided by this utility model, and thus has all the beneficial effects of the sleeve-type mixing blade provided by this utility model. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 A schematic diagram of the structure of the sleeve-type stirring paddle provided in the embodiment of this utility model;

[0026] Figure 2 for Figure 1 The diagram shows the structure of the blade sleeve of the sleeve-type agitator.

[0027] Figure 3 for Figure 1 The diagram shows the structure of the blades of the sleeve-type agitator.

[0028] Figure 4 for Figure 3 A schematic diagram of the blades of the sleeve-type agitator at another angle.

[0029] Figure 5 This is a schematic diagram of the structure of the stirring device provided in an embodiment of the present utility model.

[0030] Icons: 100-Blade sleeve; 101-Blade sleeve; 102-Assembly hole; 103-Positioning key; 104-First connecting plate; 105-First mounting hole; 200-Blade; 201-Second connecting plate; 202-Blade body; 203-Rib; 204-Second large surface; 205-First large surface; 300-Reaction vessel; 400-Drive device; 500-Auxiliary support frame; 600-Positioning bracket; 700-Stirring shaft. Detailed Implementation

[0031] The terms "first", "second", "third", and the like, are used only to distinguish descriptions, and do not indicate the arrangement number, and cannot be understood as indicating or implying relative importance.

[0032] In addition, the terms "horizontal", "vertical", "overhanging", and the like, do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that it is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0033] In the description of the present application, it should be pointed out that the terms "inner", "outer", "left", "right", "upper", "lower", and the like, indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product is used, only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0034] In the description of the present application, unless otherwise specified and limited, the terms "set", "mount", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements.

[0035] The technical solutions of the present application will be described below in conjunction with the drawings.

[0036] Embodiments

[0037] Reference Figures 1-5 The utility model provides a kind of sleeve type stirring paddle, including blade sleeve 100 and at least two blade 200 being set on the blade sleeve 100;

[0038] The blade sleeve 100 includes at least two blade sub-sleeves 101, and a plurality of blade sub-sleeves 101 are spliced to form a blade sleeve 100. Each blade sub-sleeve 101 is provided with at least one blade 200. The cross section of the blade 200 gradually decreases along the radial direction of the blade sleeve 100.

[0039] In some embodiments, the blade sleeve 100 of the sleeve stirring paddle is used to be sleeved on the stirring shaft 700, so that the sleeve stirring paddle can rotate with the stirring shaft 700; the blade sleeve 100 comprises a plurality of blade sub-sleeves 101, preferably two blade sub-sleeves 101, which are spliced to form the blade sleeve 100; the two blade sub-sleeves 101 are connected by bolts, so that the two blade sub-sleeves 101 are spliced to form the blade sleeve 100, realizing the assembly of the blade sleeve 100 type stirring paddle on the stirring shaft 700.

[0040] In this application, the radial direction refers to the radial direction of the blade sleeve 100, and the blade 200 is arranged on the blade sub-sleeve 101; the thickness of the blade 200 is fixed, and the cross section of the blade 200 in the radial direction of the blade sleeve 100 gradually decreases; since the reaction kettle 300 is circular, the liquid discharge capacity of the blade 200 with the same structure gradually increases in the radial direction; when the blade 200 with the cross section gradually decreasing in the radial direction is used, the liquid discharge capacity of the blade 200 in the radial direction is balanced, the stability of stirring is improved, the liquid discharge capacity and the circulation capacity in the stirring process are increased, the problem that the propeller type and turbine type stirring cannot stir the material with large density or easy to settle is solved, and the formation of the "cylindrical rotation zone" is destroyed.

[0041] The horizontal projection area of the blade 200 in the rotation direction decreases, the outermost liquid discharge capacity of the blade 200 is smaller than that of the conventional axial flow paddle, the stirring resistance is small, the motor energy consumption is reduced, and the energy-saving and high-efficiency characteristics are considered.

[0042] In optional embodiments, the angle between the cross section of at least part of the blade 200 and the horizontal plane gradually increases along the radial direction of the blade sleeve 100.

[0043] And / or, the width of the cross section of at least part of the blade 200 gradually decreases along the radial direction of the blade sleeve 100.

[0044] In some embodiments, the lower end of part of the blade 200 is bent downward and forms an arc surface, which can make the material move better along the blade 200, and improve the stirring effect of the blade 200.

[0045] In order to reduce the formation of the "cylindrical rotation zone", the width of the part of the blade 200 gradually decreases, so that the amount of fluid pushed by the blade 200 in the radial direction is reduced, and since the amount of fluid in the radial direction gradually increases, the amount of fluid driven by the blade 200 in the radial direction tends to be stable, the stability of stirring is improved, the liquid discharge capacity and the circulation capacity in the stirring process are increased, the problem that the propeller type and turbine type stirring cannot stir the material with large density or easy to settle is solved, and the formation of the "cylindrical rotation zone" is destroyed.

[0046] In an optional embodiment, the blade sleeve 100 is provided with an assembly hole 102 for mounting on the stirring shaft 700, and a positioning key 103 is provided in the assembly hole 102.

[0047] Furthermore, a positioning screw hole is provided on at least one blade sleeve 101, and a positioning bolt is provided on the positioning screw hole. The positioning bolt is used to abut against the stirring shaft 700.

[0048] In some embodiments, to prevent the impeller sleeve 100 from rotating relative to the stirring shaft 700, a positioning key 103 is provided in the assembly hole 102, and a positioning hole matching the positioning key 103 is provided on the stirring shaft 700; when the sleeve-type stirring impeller sleeve 100 is placed on the stirring shaft 700, the positioning key 103 is inserted into the positioning hole, so that the sleeve-type stirring impeller cannot rotate on the stirring shaft 700; that is, the stirring shaft 700 can drive the sleeve-type stirring impeller to rotate synchronously.

[0049] To further secure the sleeve-type agitator, a positioning screw hole is provided on the blade sleeve 100, and a positioning bolt is provided on the positioning screw hole. The positioning bolt can abut against the agitator shaft 700, which can further fix the blade sleeve 100 and the agitator shaft 700, and make the blade sleeve 100 and the agitator shaft 700 rotate synchronously. Multiple positioning screw holes can be provided on the blade sleeve 100, which can make the blade sleeve 100 and the agitator shaft 700 more firmly fixed and prevent loosening during the agitation process.

[0050] For the large-capacity reactor 300, when the process needs to be changed and the blade sleeve 100 needs to be replaced, there is no need to disassemble the main stirring shaft 700. You only need to switch to different specifications of blades 200, making the installation more flexible and convenient.

[0051] In an optional embodiment, a first connecting plate 104 is provided on the blade sleeve 101, and the blade 200 is detachably connected to the first connecting plate 104.

[0052] The impeller sleeve 101 is provided with one or more first connecting plates 104, and the impeller 200 is detachably connected to the first connecting plate 104. When the impeller 200 needs to be replaced, only the impeller 200 and the first connecting plate 104 are separated, and the new impeller 200 is connected to the first connecting plate 104, so as to realize the replacement of the impeller 200 of the sleeve-type stirring paddle, improve the efficiency of the impeller 200 replacement, reduce the difficulty of the impeller 200 replacement, make the installation and disassembly of the impeller 200 more convenient, and have a wide range of applications, especially suitable for the replacement of the impeller 200 of the large-capacity reactor 300.

[0053] In an optional embodiment, the first connecting plate 104 is provided with a plurality of first mounting holes 105, and the blade 200 includes a blade body 202 and a second connecting plate 201. The second connecting plate 201 is disposed at one end of the blade body 202, and the second connecting plate 201 is provided with a second mounting hole that can coincide with the first mounting holes 105.

[0054] Four first mounting holes 105 are provided on the first connecting plate 104. The first connecting plate 104 on the blade body 202 of the blade 200 is provided with second mounting holes that correspond one-to-one with the first mounting holes 105. The first connecting plate 104 and the second connecting plate 201 are connected by bolts to fix the blade 200 on the first connecting plate 104.

[0055] The first connecting plate 104 and the second connecting plate 201 are connected by reamed hole bolts. The diameter of the threaded part of the reamed hole bolt is a transition fit (not a clearance fit) with the blade 200. When there is relative sliding between the blade 200 and the blade sleeve 100, the reamed hole bolt itself is used to prevent movement. The preload is small and the shear resistance is large.

[0056] In an optional embodiment, the radial length of the rib 203 on the blade 200 is not greater than half of the radial length of the blade 200, and / or the radial length of the rib 203 on the blade 200 is not less than one-third of the radial length of the blade 200.

[0057] To improve the strength of the blade 200, a rib 203 is provided on the blade 200. The rib 203 extends radially along the blade 200. The length of the rib 203 is not less than one-third or not more than one-half of the blade 200. Preferably, the length of the rib 203 is not less than one-third or not more than one-half of the blade 200.

[0058] In order for the ribs 203 to disrupt the formation of the "cylindrical rotating zone" and prevent the risk of uncontrollable mixing of sludge, the length of the ribs 203 is generally not less than one-third and not more than half of the blade body 202. The length of the ribs 203 needs to be not less than the radius of the "cylindrical rotating zone". When vortices are generated, the irregular shape of the ribs 203 at high speed will cause the flow to generate vortices that cannot present a regular spiral line, thus forming several irregular vortices or irregular flows in the central area, thereby disrupting the cylindrical rotating zone and enabling the fluid to mix effectively.

[0059] Reference Figure 3In an optional embodiment, the blade 200 has a first large surface 205 and a second large surface 204, the first large surface 205 being an arc-shaped surface used to apply pressure to the material; and / or, the second large surface 204 is disposed on the side of the blade 200 away from the first large surface 205, and the rib 203 is disposed on the second large surface 204.

[0060] The first large surface 205 of the blade 200 is an arc-shaped surface. The arc-shaped blade 200 increases the contact area during stirring, resulting in good discharge performance, low shear force, and energy saving of more than 30% under the same working conditions. It is especially suitable for stirring in the latex industry.

[0061] The blade 200 is made by bending steel plates according to a certain pattern, without the need for milling or precision casting and other forming processes, making it easy to manufacture.

[0062] In an optional embodiment, the height of the rib 203 decreases radially from the blade sleeve 101.

[0063] When vortices are generated, the irregular shape of the ribs 203 of the blade 200 at high speeds prevents the vortices generated by the flow from exhibiting a regular spiral pattern. Since the radial discharge volume of the blades 200 with the same structure gradually increases, the discharge volume decreases closer to the blade sleeve 100, making it easier to form a "cylindrical rotating zone". By increasing the height of the ribs 203, the ability to prevent the vortices generated by the flow from exhibiting a regular spiral pattern is increased.

[0064] The sleeve-type stirring paddle provided by this utility model has a blade sleeve 100 fitted on the stirring shaft 700. The blades 200 set on the blade sleeve 100 have a gradually smaller cross section in the radial direction. Since the reactor 300 is circular, the discharge volume of the blades 200 with the same structure gradually increases in the radial direction. When the blades 200 with a gradually smaller cross section in the radial direction are used, the discharge volume area of ​​the blades 200 in the radial direction is balanced, which improves the stability of stirring. Moreover, the discharge volume and circulation volume during the stirring process are increased, which solves the problem that propeller-type and turbine-type stirring cannot stir materials with high density or easy to settle. At the same time, it destroys the formation of the "cylindrical rotation zone".

[0065] Reference Figure 5 This utility model provides a stirring device, including a reaction vessel 300 and a sleeve-type stirring paddle as described in any of the preceding embodiments. A driving device 400 is provided at the upper end of the reaction vessel 300, and a stirring shaft 700 is provided on the driving device 400, extending into the reaction vessel 300;

[0066] A positioning bracket 600 is provided inside the reaction vessel 300, and one end of the stirring shaft 700 away from the driving device 400 is mounted on the positioning bracket 600.

[0067] One or more of the sleeve-type stirring blades are mounted on the stirring shaft 700.

[0068] In an optional embodiment, an auxiliary support frame 500 is provided inside the reactor 300, and the stirring shaft 700 is rotatably mounted on the auxiliary support frame 500.

[0069] The reactor 300 of the stirring equipment is relatively large. To ensure the stirring shaft 700 remains vertical, a positioning bracket 600 is installed inside the reactor 300. One end of the stirring shaft 700 is rotatably mounted on the positioning bracket 600, thus ensuring that the stirring shaft 700 remains vertical during rotation. To further secure the stirring shaft 700, an auxiliary support frame 500 is installed in the reactor 300. The auxiliary support frame 500 is located in the middle of the reactor 300, and the stirring shaft 700 is rotatably mounted on the auxiliary support frame 500. The stirring shaft 700 has three fixing points: the connection between the stirring shaft 700 and the reactor 300, the auxiliary support frame 500, and the positioning bracket 600. This ensures that the stirring shaft 700 can rotate accurately, guarantees the service life of the stirring shaft 700, and avoids affecting the service life of the stirring shaft 700 due to the use of a large-sized sleeve-type stirring paddle.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A sleeve-type stirring paddle, characterized in that, Includes a blade sleeve (100) and at least two blades (200) disposed on the blade sleeve (100); The blade sleeve (100) is formed by splicing together at least two blade sub-sleeves (101), and each blade sub-sleeve (101) is provided with at least one blade (200); and the cross section of the blade (200) gradually decreases along the radial direction of the blade sleeve (100); The blade (200) is provided with ribs (203); the blade (200) has a first large surface (205) and a second large surface (204), the first large surface (205) is used to apply pressure to the material; the second large surface (204) is provided on the side of the blade (200) away from the first large surface (205), the ribs (203) are provided on the second large surface (204), and the height of the ribs (203) decreases radially from the blade sleeve (101); The radial length of the rib (203) on the blade (200) is not greater than half of the radial length of the blade (200), and / or the radial length of the rib (203) on the blade (200) is not less than one-third of the radial length of the blade (200).

2. The sleeve-type stirring paddle according to claim 1, characterized in that, The angle between the cross section of at least some blades (200) and the horizontal plane increases sequentially along the radial direction of the blade sleeve (100); And / or, at least some of the blades (200) have a cross-sectional width that decreases sequentially along the radial direction of the blade sleeve (100).

3. The sleeve-type stirring paddle according to claim 1, characterized in that, The blade sleeve (100) is provided with an assembly hole (102) for mounting on the stirring shaft (700), and a positioning key (103) is provided in the assembly hole (102). A positioning screw hole is provided on at least one blade sleeve (101), and a positioning bolt is provided on the positioning screw hole, the positioning bolt being used to abut against the stirring shaft (700).

4. The sleeve-type stirring paddle according to claim 1, characterized in that, The blade sleeve (101) is provided with a first connecting plate (104), and the blade (200) is detachably connected to the first connecting plate (104).

5. The sleeve-type stirring paddle according to claim 4, characterized in that, The first connecting plate (104) is provided with a plurality of first mounting holes (105). The blade (200) includes a blade body (202) and a second connecting plate (201). The second connecting plate (201) is disposed at one end of the blade body (202). The second connecting plate (201) is provided with a second mounting hole that can coincide with the first mounting hole (105).

6. The sleeve-type stirring paddle according to claim 5, characterized in that, The first large surface (205) is an arc-shaped surface.

7. A mixing device, characterized in that, Includes a reaction vessel (300) and a sleeve-type stirring paddle as described in any one of claims 1-6; The upper end of the reactor (300) is provided with a driving device (400), and the driving device (400) is provided with a stirring shaft (700), which extends into the reactor (300); A positioning bracket (600) is provided inside the reactor (300), and the end of the stirring shaft (700) away from the driving device (400) is mounted on the positioning bracket (600); One or more of the sleeve-type agitators are mounted on the agitator shaft (700).

8. The mixing device according to claim 7, characterized in that, An auxiliary support frame (500) is provided inside the reactor (300), and the stirring shaft (700) is rotatably mounted on the auxiliary support frame (500).

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