A mixing component for a skid-mounted powder mixing device

Abstract

A mixing component for a skid-mounted powder mixing device relates to the technical field of mixing equipment, comprising a venturi mixer with a feed channel, a nozzle, a receiving section, a mixing section, and a diffusion section, wherein the nozzle and the mixing section in the venturi mixer are arranged obliquely, and a promotion section as a pipe body of equal diameter is provided at the outlet end of the diffusion section through a flange connection, wherein a perforated blade support perpendicular to the axial direction of the promotion section is provided inside the promotion section, and a mixing blade perpendicular to the axial direction of the promotion section is provided on the side of the blade support close to the diffusion section, and a cleaning rod extending along the inner wall of the mixer to the receiving section is connected to the far end of the mixing blade, and a cleaning head is provided on the cleaning rod for contacting with the reduced diameter opening of the receiving section and the nozzle nozzle, and the cleaning rod can rotate around the central axis of the nozzle under the drive of the mixing blade; a cleaning rod with a brush is provided on the mixing blade, and the cleaning head on the cleaning rod can continuously clean the reduced diameter opening at the front end of the mixing section to prevent powder from agglomerating, adhering, and clogging the mixing section and the nozzle.

Description

Technical Field

[0001] The invention relates to the technical field of mixing equipment, and in particular to a mixing component for a skid-mounted powder mixing device. Background Art

[0002] In the petroleum industry, due to the need for large-scale application and preservation, oilfield chemicals are usually stored and transported in the form of powders, and then added to the base fluid for mixing and preparation when needed. The preparation process usually uses integrated skid-mounted mixing equipment with functions such as powder pretreatment and powder and base fluid mixing for on-site construction. Among them, the core components that play a mixing role in the currently widely used integrated skid-mounted mixing equipment mostly use the Venturi mixer widely used in the field of powder mixing. Its basic working principle is that the reduced-diameter nozzle in the Venturi mixer accelerates the base fluid, and uses the negative pressure conditions generated by the high-speed fluid to suck the powder into the high-speed fluid column to form a mixture. However, the conventional Venturi mixer is usually set up in such a way that the reduced-diameter nozzle and the fluid direction are kept horizontal, the inlet for adding powder is located above the reduced-diameter nozzle and kept vertical, and in order to ensure the mixing effect, the shell part that accommodates the reduced-diameter nozzle also has a reduced-diameter section, namely the throat section. When the powder first falls around the reducing nozzle and then is sucked into the high-speed fluid column, due to the influence of factors such as the possible change in fluid velocity, powder will inevitably accumulate below the reducing nozzle, that is, the front section of the throat section. After being wetted by the fluid, this part of the powder will most likely solidify into lumps of powder, eventually leading to a reduction in the flow rate of the reducing nozzle and the throat section or blockage.

[0003] In order to solve this problem, the prior art usually adopts an inclined setting method to deal with it, that is, the reduced diameter nozzle and the throat section are adjusted to be tilted downward at a certain angle, and the accumulation of powder here is reduced by gravity, so as to achieve anti-blocking. However, adjusting the reduced diameter nozzle to be tilted downward also makes it easier for the liquid sprayed from the reduced diameter nozzle to splash to the throat section, and the powder falling here will be more likely to contact with the liquid, making it easier to agglomerate into large clumps. In addition, since the base fluid in the oilfield chemicals is often added with corresponding viscosity-increasing and surface wettability-improving agents, the large clumps of powder accumulated in the throat often have a more stable structure and stronger wall adhesion, making it difficult to obtain a better anti-blocking effect even if the Venturi mixer is tilted. Summary of the invention

[0004] In view of this, the object of the present invention is to provide a mixing assembly for a skid-mounted powder mixing device, which continuously cleans the reduced-diameter nozzle and the throat by providing a special cleaning rod, effectively preventing the powder from clumping and adhering there, and achieving a better anti-blocking effect.

[0005] In order to solve at least one of the above technical problems, the technical solution provided by the present invention is:

[0006] A mixing assembly for a skid-mounted powder mixing device, comprising a venturi mixer with a feed channel, a nozzle, a receiving section, a mixing section, and a diffusion section, wherein the feed channel and the nozzle in the venturi mixer have an acute angle between their respective spraying directions, and a facilitating section of a pipe of equal diameter is provided at the outlet end of the diffusion section through a flange connection, wherein a paddle support perpendicular to the axial direction of the paddle support is provided inside the facilitating section, and both sides of the paddle support are kept in communication;

[0007] A mixing blade perpendicular to the axial direction of the promotion section is arranged on one side of the blade support close to the diffusion section, and a cleaning rod coplanar with the central axis of the nozzle and respectively closely attached to the inner walls of the promotion section, the diffusion section and the mixing section and extending to the receiving section is connected to the far end of the mixing blade;

[0008] One end of the cleaning rod located in the receiving section is provided with a cleaning head which contacts the reduced diameter opening of the receiving section and the outer wall of the nozzle of the nozzle respectively. The cleaning rod can rotate around the central axis of the nozzle driven by the mixing blade.

[0009] An implementation manner of the present invention is that the rotation radius of the cleaning rod is greater than the cross-sectional radius of the nozzle opening of the nozzle.

[0010] One embodiment of the present invention is that a pneumatic ball valve and an air supply flange are provided on the flange connection of the feed channel, wherein the air supply flange includes a plurality of groups of air inlet holes, and the air inlet holes are connected to the flange through holes by the side surface of the air supply flange.

[0011] Furthermore, the air inlet hole is not perpendicular to the tangent line at the contact point of the flange through hole.

[0012] An implementation manner of the present invention is that the blades of the mixing blade are symmetrical double blades arranged at 180 degrees, and the symmetrical double blades are respectively provided with two groups of cleaning rods distributed symmetrically at 180 degrees.

[0013] An implementation manner of the present invention is that the cleaning head is a brush structure.

[0014] An implementation manner of the present invention is that the cleaning rod and the mixing blade are detachably connected.

[0015] An embodiment of the present invention is that the inner wall of the feed port at the bottom of the feed channel is conical, and the cone has an oblique cut pointing to the mixing section.

[0016] The technical effects of the present invention are:

[0017] 1. A cleaning rod with a brush is provided on the mixing blade. The fluid sprayed from the nozzle drives the mixing blade and the cleaning rod to rotate together, so that the cleaning head on the cleaning rod can continuously clean the reduced diameter port and the nozzle head at the front end of the mixing section to prevent the powder from agglomerating and adhering to these positions to block the mixing section and the nozzle.

[0018] 2. The cleaning rod rotates around the central axis of the nozzle, which can generate a vortex flow in the fluid ejected from the nozzle, thereby improving the mixing effect between the fluid ejected from the nozzle and the powder.

[0019] 3. The power source of the mixing blade is the fluid ejected from the nozzle. There is no need to introduce an additional power source. The device is simple and energy-saving. The mixing blade can shear the fluid circumferentially when rotating, further improving the mixing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is an overall schematic diagram of the present invention;

[0022] Figure 2 is an axial schematic diagram of the nozzle nozzle along the fluid direction in the present invention;

[0023] Figure 3 It is a perspective schematic diagram of the air supply flange in the present invention;

[0024] Figure 4 yes Figure 1 Enlarged view of point A in the middle;

[0025] In the figure, 1- pneumatic ball valve, 2- air supply flange, 3- feed channel, 4- nozzle, 5- receiving section, 6- mixing section, 7- diffusion section, 8- promotion section, 9- blade support, 10- mixing blade, 11- cleaning rod, 12- cleaning head, 21- flange through hole, 22- air inlet hole, 23- screw hole, 51- reducing port. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below in conjunction with the embodiments and drawings.

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention.

[0028] See also Figure 1 A mixing assembly for a skid-mounted powder mixing device includes a venturi mixer with a feed channel 3, a nozzle 4, a receiving section 5, a mixing section 6, and a diffusion section 7. The above structure can refer to the common venturi mixer in the prior art. The inner wall of the nozzle of the nozzle 4 and the reduced diameter opening 51 of the receiving section 5 are both conical structures. The mixing action is mainly carried out in the reduced diameter mixing section 6 (throat). It can be seen that the reduced diameter opening 51 connecting the receiving section 5 and the mixing section 6 is easy to become a place where powder agglomerates gather and adhere, especially at the position below the nozzle 4. The angle between the feed channel 3 and the nozzle 4 in the venturi mixer is an acute angle, that is, the nozzle 4, the receiving section 5, the mixing section 6, and the diffusion section 7 are arranged to be tilted downward. The structure can also refer to the inclined venturi mixer in the prior art. In addition, the inner wall of the feed port at the bottom of the feed channel 3 is conical, and the cone has an oblique cut pointing to the mixing section 6. Its conical structure can generate greater suction than a conventional equal-diameter feed port. At the same time, the oblique cut pointing to the mixing section 6 is conducive to the airflow to transport the powder to the nozzle of the nozzle 4 for mixing, which can effectively improve the mixing efficiency of the subsequent fluid and powder and reduce the probability of the powder falling directly on the wall of the receiving section 5 and sticking to it.

[0029] The outlet end of the diffuser section 7 is flange-connected with a promotion section 8 of an equal-diameter pipe body, wherein a blade support 9 perpendicular to the axial direction is provided inside the promotion section 8, and both sides of the blade support 9 are connected. The promotion section 8 is flange-connected to the outlet side of the diffuser section 7, which is convenient for modular installation or maintenance. The blade support 9 is as shown in FIG. Figure 2 As shown, support is achieved by contacting the inner wall of the promotion section 8. Obviously, in order to ensure the mixing effect of the device, the paddle support 9 needs to have a through hole large enough to allow the fluid to pass freely.

[0030] See also Figure 2A mixing blade 10 perpendicular to the axial direction of the promoting section 8 is arranged on the side of the blade support 9 close to the diffusion section 7. The far end of the mixing blade 10 is connected to a cleaning rod 11 which is coplanar with the central axis of the nozzle 4 and is respectively close to the inner walls of the promoting section 8, the diffusion section 7, and the mixing section 6 and extends to the receiving section 5. When the base fluid of the mixed powder sprayed from the nozzle 4 enters the promoting section 8, it will first contact the mixing blade 10 and drive it to rotate around the axis, and then pass through the through hole of the blade support 9 to enter the subsequent pipeline. The rotation direction of the mixing blade 10 can be adjusted by the distribution of the blades. In addition, its blade density can also be comprehensively considered according to factors such as actual flow rate and rotation speed, and is not particularly limited here.

[0031] See also Figure 1 The cleaning rod 11 extends along the inner wall of the promotion section 8, the diffusion section 7, and the mixing section 6 to the receiving section 5, and is arranged as close to the inner wall of the above-mentioned component sections as possible without interfering with its normal operation, and the surface of the inner wall can be lined with a polymer with high smoothness, such as a polytetrafluoroethylene lining, which can further reduce the adhesion of powder to the wall on the one hand, and reduce the resistance of the cleaning rod 11 to the wall movement on the other hand; the cleaning rod 11 can be specifically represented as follows Figure 1 The wall-adhering state shown in FIG. 1 can avoid the interference of the cleaning rod 11 with the jet generated in the nozzle 4 when the cleaning rod 11 rotates as much as possible. Figure 4 The cleaning rod 11 is also provided with a cleaning head 12 that contacts the reduced diameter opening 51 of the receiving section 5 and the outer wall of the nozzle of the nozzle 4. Figure 1 , Figure 2 In the structure shown, when the mixing blade 10 is impacted by the fluid and rotates, the cleaning rod 11 will be driven by the mixing blade 10 to rotate in the same way, so that the cleaning rod 11 can rotate around the central axis of the nozzle 4 driven by the mixing blade 10. In this process, the cleaning head 12 on the cleaning rod 11 will simultaneously rotate and contact with the surface of the reduced diameter port 51 and the outer wall of the nozzle of the nozzle 4, both of which show continuous circular sweeping, making it difficult for powder to accumulate at these positions. The powder located below the nozzle 4 will be swept up by the cleaning head 12 and rise along the arc surface of the reduced diameter port 51 before it accumulates in large quantities and sticks to form large clumps. The powder adhered to the outer wall of the nozzle of the nozzle 4 is also swept down before it accumulates in large quantities, and it is easy to fall into the fluid ejected from the nozzle 4 under the influence of gravity, thereby achieving effective cleaning of the powder at the reduced diameter port.

[0032] In this embodiment, the blades of the mixing paddle 10 are symmetrical double paddles arranged at 180 degrees, and two groups of cleaning rods 11 symmetrically distributed at 180 degrees are respectively arranged on the symmetrical double paddles. When the cleaning rods 11 rotate, they can stir the fluid sprayed into the mixing section 6 and the diffusion section 7 to generate a vortex flow, thereby assisting the mixing of the powder in the fluid. The two groups of symmetrically arranged cleaning rods 11 can provide better mixing effect and powder cleaning effect; the cleaning rods 11 and the mixing paddle 10 are detachably connected, so that the cleaning rods 11 can be removed from the mixing paddle 10 for maintenance; the cleaning head 12 is a brush The structure includes but is not limited to a brush, a metal brush, and a polymer brush. The brush should have a certain hardness and plasticity to ensure the cleaning effect on the one hand and to facilitate its removal from the receiving section 5 on the other hand. In addition, the rotation radius of the cleaning rod 11 is greater than the cross-sectional radius of the nozzle of the nozzle 4, that is, the inner diameter of the nozzle of the nozzle 4 is smaller than the overall inner diameter of the mixing section 6, and the moving circle radius of the cleaning rod 11 is between the two. This can prevent the fluid sprayed from the nozzle 4 from being directly sprayed onto the cleaning rod 11, affecting the injection speed of the fluid, and also prevent the cleaning head 12 from being directly impacted by the fluid.

[0033] In some embodiments, a pneumatic ball valve 1 and an air supply flange 2 are provided on the feed channel 3 in a flange connection, wherein the air supply flange 2 is as follows: Figure 3 As shown, it includes multiple groups of air inlet holes 22, and the screw holes 23 on the flange are used to accommodate bolts. The air inlet holes 22 are connected to the flange through holes 21 by the side surface of the air-supplementing flange 2. The air inlet holes 22 are not perpendicular to the tangent at the contact point of the flange through hole 21. The function of the pneumatic ball valve 1 is to form automatic control of the feed and improve the degree of automation of the equipment. The air inlet holes 22 on the air-supplementing flange 2 are connected to an external air source, and an inert gas is injected by the external air source to apply positive pressure thereto. When in use, the externally injected gas will enter the flange through hole 21 through the air inlet holes 22. The air intake direction that is not perpendicular to the tangent at the contact point of the flange through hole 21 allows the incoming gas to produce a component flowing along the annular inner wall of the flange through hole 21, that is, to produce a tangential air intake effect, so that the powder is subject to the dual influence of the vortex-shaped and vertical airflows, thereby achieving sufficient crushing of the powder and further avoiding subsequent large-particle powder from agglomerating at the reduced diameter port 51.

[0034] In summary, the use of the present invention is as follows:

[0035] like Figure 1The structure shown installs the mixing component in the skid-mounted mixing device. When working, the pneumatic ball valve 1 opens the passage to introduce the powder into the feed channel 3. In this process, the air-infusing flange 2 inflates the powder to improve the mixing and crushing effect of the powder and further reduce the average particle size of the powder. The nozzle 4 sprays the base fluid as the configuration object. The reduced diameter structure of the nozzle 4 accelerates the fluid to generate negative pressure, sucking the powder into the fluid and bringing it into the mixing section 6 for mixing. Then, it is discharged to the subsequent pipeline by the promotion section 8. During the injection process of the fluid, the mixing blade 10 and the cleaning rod 11 are driven to rotate, so that The cleaning head 12 on the cleaning rod 11 that is in contact with the surface of the reduced diameter port 51 and the outer wall of the nozzle of the nozzle 4 also produces a circular rotation, brushing off the powder adsorbed and accumulated on the surface of the reduced diameter port 51 and sucking it into the fluid, making it difficult for the powder to accumulate here in large quantities, thereby playing the role of continuously cleaning the reduced diameter port 51 and the nozzle of the nozzle 4, and can effectively prevent the blockage of the reduced diameter port 51 and the nozzle 4. At the same time, in this process, the mixing blades 10 and the cleaning rod 11 also need to rotate in contact with the fluid mixed with the powder, and can perform vortex stirring and circumferential shear on the fluid at the edge of the fluid, further improving the mixing effect.

[0036] In the description of the present invention, it should be pointed out that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and should not be understood as a limitation on the present invention.

[0037] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the embodiments of the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A mixing assembly for a skid-mounted powder mixing device, comprising a venturi mixer with a feed channel (3), a nozzle (4), a receiving section (5), a mixing section (6), and a diffusion section (7), characterized in that: The angle between the injection direction of the feed channel (3) and the nozzle (4) in the venturi mixer is an acute angle, and the outlet end of the diffusion section (7) is connected to a flange with a promotion section (8) of a pipe body of equal diameter, wherein a blade support (9) perpendicular to the axial direction of the promotion section (8) is provided inside the promotion section (8), and the two sides of the blade support (9) are kept in communication; A mixing blade (10) is disposed on one side of the blade support (9) close to the diffusion section (7) and is perpendicular to the axial direction of the promotion section (8); a cleaning rod (11) is connected to the far end of the mixing blade (10) and is coplanar with the central axis of the nozzle (4) and is respectively closely attached to the inner walls of the promotion section (8), the diffusion section (7) and the mixing section (6) and extends to the receiving section (5); One end of the cleaning rod (11) located in the receiving section (5) is provided with a cleaning head (12) which contacts the reduced diameter opening (51) of the receiving section (5) and the outer wall of the nozzle of the nozzle (4), respectively. The cleaning rod (11) can rotate around the central axis of the nozzle (4) driven by the mixing blade (10).

2. A mixing assembly for a skid-mounted powder mixing device according to claim 1, characterized in that: The rotation radius of the cleaning rod (11) is greater than the cross-sectional radius of the nozzle of the nozzle pipe (4).

3. The mixing assembly for a skid-mounted powder mixing device according to claim 1, characterized in that: The feed channel (3) is flange-connected with a pneumatic ball valve (1) and an air supply flange (2), wherein the air supply flange (2) comprises a plurality of groups of air inlet holes (22), and the air inlet holes (22) are connected to the flange through holes (21) via the side surface of the air supply flange (2).

4. A mixing assembly for a skid-mounted powder mixing device according to claim 3, characterized in that: The air inlet hole (22) is not perpendicular to a tangent line at a contact point of the flange through hole (21).

5. The mixing assembly for a skid-mounted powder mixing device according to claim 1, characterized in that: The mixing blades (10) are double blades symmetrically arranged at 180°, and the double blades are respectively provided with two groups of cleaning rods (11) symmetrically distributed at 180°.

6. The mixing assembly for a skid-mounted powder mixing device according to claim 1, characterized in that: The cleaning head (12) is a brush structure.

7. The mixing assembly for a skid-mounted powder mixing device according to claim 1, characterized in that: The cleaning rod (11) and the mixing blade (10) are detachably connected.

8. The mixing assembly for a skid-mounted powder mixing device according to claim 1, characterized in that: The inner wall of the bottom feed port of the feed channel (3) is conical, and the cone has an oblique cut pointing toward the mixing section (6).

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