A slurry mixing device

Abstract

The application discloses a slurry mixing device which effectively solves the problem of uneven mixing of the existing slurry mixing device; the slurry mixing device comprises an upper and lower axial mixing cylinder, a rotatable rotating shaft is coaxially arranged in the mixing cylinder, a plurality of uniformly arranged stirring blades are arranged on the rotating shaft, a communication groove is coaxially arranged in the rotating shaft, a waterfall pipe is arranged at the left and right ends of the lower side of the rotating shaft and is communicated with the communication groove, a plurality of waterfall holes are formed in the waterfall pipe, a plurality of piston cylinders are arranged on the upper side of the rotating shaft and penetrate through the mixing cylinder and are arranged on the outer edge surface and are uniformly distributed along the circumferential direction, a gas conveying pipe is arranged on the piston cylinder and is inserted into the communication groove, an air inlet pipe is arranged above the gas conveying pipe, a movable piston plate is coaxially arranged in the piston cylinder, and a feeding pipe is arranged on the mixing cylinder; the slurry mixing device has the advantages of simple structure, novel design, convenient use and high practicability.

Description

Technical Field

[0001] This utility model relates to the field of drilling technology, and in particular to a slurry mixing device. Background Technology

[0002] In fields such as oil and gas drilling, geological exploration, and infrastructure construction, the formulation and performance of drilling fluids (or mud) are crucial. Drilling fluids not only perform core functions such as carrying cuttings, cooling and lubricating drill bits, and stabilizing the wellbore, but their density, rheological properties, and suspension stability directly affect drilling efficiency, safety, and cost. Traditionally, drilling fluid mixing relies primarily on mechanical agitation devices. Rotating impellers within a mixing tank utilize shear force to disperse and mix solid additives (such as bentonite, barite, and polymers) into the liquid phase (water or oil). However, this single mechanical agitation method has significant limitations: for high-density mud or mud containing easily settling heavy materials (such as weighted mud), solid precipitation and stratification (segregation) easily form at the bottom of the tank or in dead zones during agitation, resulting in uneven distribution of mud density and properties in the vertical direction. Utility Model Content

[0003] In view of the above situation and in order to overcome the shortcomings of the prior art, the purpose of this utility model is to provide a slurry mixing device that effectively solves the problem of uneven mixing between the upper and lower parts of the slurry mixing device.

[0004] The technical solution is as follows: This utility model includes a mixing cylinder with an upper and lower axial direction. A rotatable shaft is coaxially arranged inside the mixing cylinder. Multiple evenly arranged stirring blades are arranged on the shaft. A connecting groove is coaxially opened inside the shaft. Air venting pipes communicating with the connecting groove are respectively provided at the left and right ends of the lower side of the shaft. Multiple air venting holes are opened on the air venting pipes. Multiple piston cylinders are provided on the upper side of the shaft, penetrating the mixing cylinder and evenly distributed along its circumference on the outer edge surface. Air supply pipes inserted into the connecting grooves are provided on the piston cylinders. Air inlet pipes are provided on the piston cylinders above the air supply pipes. A movable piston plate is coaxially arranged inside the piston cylinders. A feeding pipe is provided on the mixing cylinder.

[0005] Preferably, the rotating shaft is rotatably connected to the mixing cylinder on the same axis, and a motor is provided at the upper end of the mixing cylinder, with the motor output shaft fixedly connected to the rotating shaft on the same axis.

[0006] Preferably, the upper end of the mixing cylinder is provided with a plurality of pressure blocks corresponding one to one with the piston cylinder. The inner end face of the pressure block is an inclined surface that slopes from the outside to the inside in a counterclockwise direction. The outer end of the piston plate is coaxially provided with a pressure column that is slidably connected to the piston cylinder and can contact the inclined surface of the pressure block.

[0007] Preferably, a spring is fitted onto the pressure column, located between the piston plate and the piston coaxially.

[0008] Preferably, the gas delivery pipe is provided with a gas delivery check valve with its opening facing the rotating shaft, and the air intake pipe is provided with an air intake check valve with its opening facing the piston cylinder.

[0009] Preferably, the mixing cylinder is provided with a discharge valve at its lower end.

[0010] Preferably, the mixing cylinder is provided with a support leg at its lower end.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: by combining mechanical stirring with aeration, a synergistic effect is formed in the mixing cylinder: the rotating stirring blades continuously provide radial shear force to break up clumps and promote solid-liquid phase mixing. At the same time, the gas delivery channel inside the rotating shaft precisely guides air to the bottom of the slurry and releases fine bubbles evenly through symmetrically distributed air ducts. The microbubbles generate strong turbulent disturbance and lifting effect in the slurry, effectively avoiding the sedimentation of heavy particles, eliminating dead corners and interlayer density differences at the bottom of the mixing cylinder, overcoming the inherent defects of sedimentation, stratification and uneven mixing that easily occur in high-density or heavy material slurries under the traditional single stirring mode, and significantly improving the slurry density and longitudinal and transverse uniformity. Attached Figure Description

[0012] Figure 1 This is the main view axonometric drawing of this utility model.

[0013] Figure 2 This is a full-section main view axonometric drawing of this utility model.

[0014] Figure 3 This is a partial axonometric view of the full sectional top view of this utility model.

[0015] Figure 4 This is a utility model Figure 2 A magnified view of A in the middle.

[0016] Figure label: 1. Mixing cylinder; 2. Rotating shaft; 3. Agitator blade; 4. Connecting groove; 5. Air vent pipe; 6. Air vent hole; 7. Piston cylinder; 8. Air supply pipe; 9. Air inlet pipe; 10. Piston plate; 11. Feeding pipe; 12. Motor; 13. Press block; 14. Press column; 15. Spring; 16. Air supply check valve; 17. Air inlet check valve; 18. Discharge valve. Detailed Implementation

[0017] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the implementations of the base model disclosed below.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0019] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0020] Depend on Figures 1 to 4 The present invention includes a mixing cylinder 1 with an upper and lower axial direction, a rotatable shaft 2 coaxially arranged inside the mixing cylinder 1, a plurality of evenly arranged stirring blades 3 on the shaft 2, a connecting groove 4 coaxially opened inside the shaft 2, air venting pipes 5 connected to the connecting groove 4 at the left and right ends of the lower side of the shaft 2 respectively, a plurality of air venting holes 6 opened on the air venting pipes 5, a plurality of piston cylinders 7 passing through the mixing cylinder 1 on the upper side of the shaft 2 and evenly distributed along its circumference on the outer edge surface, an air supply pipe 8 inserted into the connecting groove 4 on the piston cylinder 7, an air inlet pipe 9 located above the air supply pipe 8 on the piston cylinder 7, a movable piston plate 10 coaxially arranged inside the piston cylinder 7, and a feeding pipe 11 on the mixing cylinder 1.

[0021] In order to make the rotating shaft 2 rotate, the rotating shaft 2 is coaxially rotatably connected to the mixing cylinder 1. The upper end of the mixing cylinder 1 is provided with a motor 12, and the output shaft of the motor 12 is coaxially fixedly connected to the rotating shaft 2.

[0022] In order to move the piston plate 10, the upper end of the mixing cylinder 1 is provided with a plurality of pressure blocks 13 corresponding to the piston cylinder 7. The inner end face of the pressure block 13 is an inclined surface that is inclined from the outside to the inside in a counterclockwise direction. The outer end of the piston plate 10 is coaxially provided with a pressure column 14 that is slidably connected to the piston cylinder 7 and can contact the inclined surface of the pressure block 13.

[0023] To facilitate the reset of the pressure column 14, a spring 15 is fitted on the pressure column 14, located between the piston plate 10 and the piston on the same axis.

[0024] To prevent air backflow, the air supply pipe 8 is equipped with an air supply check valve 16 with its opening facing the rotating shaft 2, and the air intake pipe 9 is equipped with an air intake check valve 17 with its opening facing the piston cylinder 7.

[0025] To facilitate unloading, the mixing cylinder 1 is equipped with a discharge valve 18 at its lower end.

[0026] For ease of support, the mixing cylinder 1 is provided with support legs at its lower end.

[0027] In use, the operator first feeds the liquid phase (such as water or oil-based fluid) and solid additives (such as bentonite, barite, etc.) into the mixing cylinder 1 through the feeding pipe 11 above the mixing cylinder 1. Then, the motor 12 at the top of the mixing cylinder 1 is started, which drives the rotating shaft 2 to rotate coaxially. This drives the multiple stirring blades 3 evenly arranged on its surface to mechanically shear and stir the slurry. During the rotation of the rotating shaft 2, the multiple pressure blocks 13 fixed at the upper end of the mixing cylinder 1 will periodically squeeze the pressure column 14 at the outer end of the piston cylinder 7. When the pressure column 14 slides along the inclined surface of the inner end face of the pressure block 13, the inclined surface design causes the pressure column 14 to move inward as the rotating shaft 2 rotates counterclockwise, pushing the piston plate 10 to compress inward in the piston cylinder 7. At this time, the air inlet one-way valve 17 is closed to prevent gas leakage, while the air outlet one-way valve 16 is opened to press the air pre-stored in the piston cylinder 7 into the connecting groove 4 inside the rotating shaft 2. When the pressure column 14 disengages from the inclined surface of the pressure block 13, the spring 15 pushes the piston plate 10 to reset. At this time, the air inlet check valve 17 opens to draw in external air to supplement the air source, and the air delivery check valve 16 closes. The air is delivered through the connecting groove 4 to the air ducts 5 at both ends of the lower side of the rotating shaft 2, and is evenly sprayed out from multiple aeration holes 6 on the pipe wall in the form of microbubbles. These bubbles continue to float at the bottom of the slurry, generating turbulent disturbances and disrupting the settling tendency of solid particles. At the same time, the rotating stirring blades 3 continuously provide radial shear force. The two work together to achieve full mixing of the slurry in the vertical and horizontal directions. During the mixing process, bottom aeration effectively prevents heavy materials from accumulating at the bottom of the tank, ensuring uniform slurry density. When the mixing reaches the predetermined time or uniformity, the motor 12 is turned off, and the discharge valve 18 at the bottom of the mixing cylinder 1 is opened to discharge the uniformly mixed drilling fluid from the device.

[0028] Compared with the prior art, the beneficial effects of this utility model are as follows: by combining mechanical stirring with aeration, a synergistic effect is formed in the mixing cylinder: the rotating stirring blades continuously provide radial shear force to break up clumps and promote solid-liquid phase mixing. At the same time, the gas delivery channel inside the rotating shaft precisely guides compressed air to the bottom of the slurry and releases fine bubbles evenly through symmetrically distributed air ducts. The microbubbles generate strong turbulent disturbance and lifting effect in the slurry, effectively avoiding the sedimentation of heavy particles, eliminating dead corners and interlayer density differences at the bottom of the mixing cylinder, and overcoming the inherent defects of sedimentation, stratification and uneven mixing that easily occur in high-density or heavy material slurries under the traditional single stirring mode. It significantly improves the slurry density and longitudinal and transverse uniformity. This structure is simple, novel in concept, convenient to use and highly practical.

[0029] It should be noted that, depending on the implementation needs, the various components described in the embodiments of this utility model can be split into more components, or two or more components or parts of components can be combined into new components to achieve the purpose of the embodiments of this utility model.

[0030] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A slurry mixing device, comprising a mixing cylinder (1) with an upper and lower axial direction, characterized in that, A rotatable shaft (2) is coaxially arranged inside the mixing cylinder (1). Multiple evenly arranged stirring blades (3) are provided on the shaft (2). A connecting groove (4) is coaxially opened inside the shaft (2). Air pipes (5) communicating with the connecting groove (4) are provided on the left and right ends of the lower side of the shaft (2). Multiple air holes (6) are opened on the air pipes (5). Multiple piston cylinders (7) are evenly distributed along the circumference of the shaft (2) and pass through the mixing cylinder (1) on the upper side. An air supply pipe (8) inserted into the connecting groove (4) is provided on the piston cylinder (7). An air inlet pipe (9) located above the air supply pipe (8) is provided on the piston cylinder (7). A movable piston plate (10) is coaxially arranged inside the piston cylinder (7). A feeding pipe (11) is provided on the mixing cylinder (1).

2. The slurry mixing device according to claim 1, characterized in that, The rotating shaft (2) is coaxially rotatably connected to the mixing cylinder (1). The upper end of the mixing cylinder (1) is provided with a motor (12), and the output shaft of the motor (12) is coaxially fixedly connected to the rotating shaft (2).

3. The slurry mixing device according to claim 1, characterized in that, The mixing cylinder (1) is provided with multiple pressure blocks (13) corresponding to the piston cylinder (7) at its upper end. The inner end face of the pressure block (13) is an inclined surface that is inclined from the outside to the inside in a counterclockwise direction. The outer end of the piston plate (10) is provided with a pressure column (14) that is slidably connected to the piston cylinder (7) and can contact the inclined surface of the pressure block (13).

4. The slurry mixing device according to claim 3, characterized in that, The pressure column (14) is fitted with a spring (15) located between the piston plate (10) and the piston on the same axis.

5. The slurry mixing device according to claim 1, characterized in that, The gas supply pipe (8) is provided with a gas supply check valve (16) with its opening facing the rotating shaft (2), and the air inlet pipe (9) is provided with an air inlet check valve (17) with its opening facing the piston cylinder (7).

6. The slurry mixing device according to claim 1, characterized in that, The mixing cylinder (1) is equipped with a discharge valve (18) at its lower end.

7. The slurry mixing device according to claim 1, characterized in that, The mixing cylinder (1) is provided with a support leg at its lower end.

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