CN110559903A

CN110559903A - Static mixer

Info

Publication number: CN110559903A
Application number: CN201910896339.7A
Authority: CN
Inventors: 杨超; 刘斐; 汤建拓; 刘亚彬; 冯学亮; 钱兵保
Original assignee: HANGZHOU SHENSHI ENERGY CONSERVATION TECHNOLOGY Co Ltd
Current assignee: HANGZHOU SHENSHI ENERGY CONSERVATION TECHNOLOGY Co Ltd
Priority date: 2019-09-20
Filing date: 2019-09-20
Publication date: 2019-12-13

Abstract

The invention relates to the technical field of physical mixing equipment, in particular to a static mixer. A static mixer, comprising: a housing; the core shaft is arranged inside the shell and provided with a pre-flow unit close to the liquid inlet end and a mixing unit communicated with the pre-flow unit, the pre-flow unit is provided with a plurality of first spiral fins, the mixing unit is provided with a plurality of second spiral fins, and the distance between every two adjacent first spiral fins is larger than the distance between every two adjacent second spiral fins. The fluid enters the mixing unit for mixing again after being subjected to primary flow distribution and mixing through the pre-flow distribution area, so that the condition that the fluid in the channels between different second helical fins cannot contact due to the fact that the fluid only advances along the channels between the second helical fins after directly entering the mixing unit is avoided; the first helical fins are not matched with the second helical fins, and the fluid is uniformly distributed by the pre-flow distribution unit and then collides with the second helical fins, so that the flow direction is rapidly changed, the collision strength of the fluid is enhanced, and the mixing effect is enhanced.

Description

Static mixer

Technical Field

The invention relates to the technical field of physical mixing equipment, in particular to a static mixer.

Background

The working principle of the static mixer is that fluid flows in a pipeline to impact various plate elements, the velocity gradient of laminar flow motion of the fluid is increased or turbulent flow is formed, the laminar flow is divided, moved and recombined, and in the turbulent flow, the fluid can generate violent vortex in the cross section direction besides the three conditions, and strong shearing force acts on the fluid to further divide and mix the fluid, and finally the fluid is mixed to form the required liquid. The mixing effect of the mixer is the most important feature sought for the field of application of the mixer.

For example, chinese patent CN108327219A discloses a static mixer, which enhances the mixing effect of fluid by changing the flow direction of fluid by arranging a plurality of mixing units axially spaced on a mandrel in the barrel of the static mixer, and the mixing blades of two adjacent mixing units are rotated in opposite directions. The fluid distribution is uneven under this structure, and striking mixing dynamics is weak, and the mixed effect is difficult to satisfy the needs to liquid mixing in the current stage technology production.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defects of uneven fluid distribution, weak impact mixing strength and poor mixing effect of the static mixer in the fluid mixing process in the prior art, thereby providing the static mixer.

In order to solve the above-mentioned technical problems, the present invention provides a static mixer, comprising,

A housing;

The core shaft is arranged inside the shell and provided with a pre-flow unit close to the liquid inlet end and a mixing unit communicated with the pre-flow unit, the pre-flow unit is provided with a plurality of first spiral fins, the mixing unit is provided with a plurality of second spiral fins, and the distance between every two adjacent first spiral fins is larger than the distance between every two adjacent second spiral fins.

Preferably, the mixing unit comprises a plurality of sub-units arranged at intervals along the axial direction of the mandrel, and a first annular groove is arranged between every two adjacent sub-units.

Preferably, the first spiral fins extend from one end of the pre-flow unit to the other end along the spiral direction of the first spiral fins and are arranged into one; the second spiral fin is arranged into a plurality of sub-fins at intervals from one end to the other end of the sub-unit along the spiral direction of the second spiral fin.

preferably, a second annular groove is formed between two sub-fins of the second spiral fin arranged at intervals along the axial direction of the mandrel, and the groove width of the second annular groove is smaller than that of the first annular groove.

Preferably, the second helical fins of two adjacent subunits have opposite rotation directions.

Preferably, the helix angle of the second helical fin is 25 to 75 degrees.

Preferably, the liquid inlet end and the liquid outlet end of the mandrel are respectively provided with a first frustum and a second frustum, the small head end of the first frustum is arranged towards the inlet of the shell, and the small head end of the second frustum is arranged towards the outlet of the shell.

Preferably, the heat exchanger further comprises a heat exchange structure sleeved outside the shell.

Preferably, the inner wall of the heat exchange structure is formed with a multi-head spiral groove.

Preferably, the housing comprises a housing body and an end cap connected by a seal.

The technical scheme of the invention has the following advantages:

1. According to the static mixer provided by the invention, the mandrel is provided with the pre-dividing unit close to the liquid inlet end and the mixing unit communicated with the pre-dividing unit, fluid is primarily distributed through the pre-dividing area, and is uniformly divided and mixed and then enters the mixing unit to be mixed again, the pre-dividing area is arranged, so that the situation that the fluid directly enters the mixing unit and then only advances along the channels among the second spiral fins is avoided, the fluid in the channels among different second spiral fins cannot be contacted, and the fluid mixing quality can be effectively enhanced; be equipped with a plurality of first helical fin on the unit of preflow, mix the unit and be equipped with a plurality of second helical fin, and two adjacent first helical fin's interval is greater than two adjacent second helical fin's interval, first helical fin does not match with second helical fin's interval, make by the fluid of preflow outflow can not directly get into the channel between the second helical fin, but with the collision of second helical fin, change flow direction rapidly, strengthen the fluid collision strength of different flow direction, the reinforcing mixes the effect.

2. According to the static mixer provided by the invention, the mixing unit comprises a plurality of sub-units which are arranged at intervals along the axial direction of the mandrel, and the first annular groove is formed between every two adjacent sub-units, so that fluid can flow along the channel between the second spiral fins and the direction vertical to the axis of the mandrel when passing through the mixing unit, the fluid flowing in multiple directions can collide, and the mixing effect is enhanced.

3. According to the static mixer provided by the invention, the number of the first spiral fins is one along the spiral direction, and the first spiral fins extend from one end to the other end of the pre-flow unit, so that fluid entering the pre-flow unit advances along the channels among the first spiral fins and is divided into a plurality of strands; the second helical fins are arranged from one end of the sub-unit to the other end of the sub-unit along the rotating direction of the second helical fins at intervals, and after a plurality of strands of fluid flowing out of the pre-flow unit enters the mixing unit, the fluid cannot smoothly advance along one direction and is strongly collided due to the discontinuity of the second helical fins, so that the mixing effect is further enhanced.

4. According to the static mixer provided by the invention, a second annular groove is formed between two sub-fins which are arranged along the axial direction of the mandrel at intervals by the second spiral fin, and the groove width of the second annular groove is smaller than that of the first annular groove. The flow trend of fluid perpendicular to dabber axis direction in mixing unit is further strengthened, and the annular groove interval of different groove widths sets up, increases the collision number of times of fluid flow in-process, and then reinforcing mixes the effect.

5. According to the static mixer provided by the invention, the rotating directions of the second spiral fins of two adjacent subunits are opposite, so that the rotating directions of the spiral fins on the adjacent subunits are increased to the greatest extent, the direction change trend is the greatest when the fluid flows from one subunit to the next subunit, and the mixing effect of the fluid is further enhanced.

6. According to the static mixer provided by the invention, the helix angle of the second helical fin is 25-75 degrees, so that the second helical fin is prevented from being parallel or vertical to the axial direction of the mandrel, and the second helical fin does not work or directly blocks fluid when the fluid flows through the mixing unit.

7. The static mixer provided by the invention is characterized in that a first frustum and a second frustum are respectively arranged at the liquid inlet end and the liquid outlet end of the mandrel, the small end of the first frustum is arranged towards the inlet of the shell and used for shunting fluid when the fluid enters the range of the mandrel, and the small end of the second frustum is arranged towards the outlet of the shell and used for converging the fluid when the fluid flows out of the range of the mandrel.

8. According to the static mixer provided by the invention, the proper temperature for mixing different fluids is different, and the heat exchange structure is sleeved on the outer side of the shell and used for heat exchange between the inside and the outside of the static mixer during working, so that the proper temperature for mixing the fluids is kept in the static mixer.

9. According to the static mixer provided by the invention, the multi-head spiral groove is formed on the inner wall of the heat exchange structure, so that heat can be rapidly and uniformly distributed in the static mixer, and the heat exchange efficiency is enhanced.

10. According to the static mixer provided by the invention, the shell comprises the shell main body and the end cover which are connected through the sealing element, so that sealing is realized when the static mixer works, and the pressure resistance of the static mixer can be increased.

drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is an exploded view of a static mixer provided in a first embodiment of the present invention.

Fig. 2 is a sectional view of a static mixer provided in a first embodiment of the present invention.

Fig. 3 is a schematic structural view of a mandrel provided in a first embodiment of the present invention.

fig. 4 is a schematic structural view of a mandrel provided in a second embodiment of the present invention.

Fig. 5 is a schematic structural view of a static mixer provided in a third embodiment of the present invention.

Fig. 6 is a schematic view of the direction of fluid flow in the mixing unit according to the first embodiment of the present invention.

Description of reference numerals: 1. a housing; 2. a mandrel; 3. a pre-stream unit; 4. a first helical fin; 5. a mixing unit; 6. a second helical fin; 7. an end cap; 8. a first annular groove; 9. a first frustum; 10. a second tapered platform; 11. a seal ring; 12. a heat exchange structure; 13. a second annular groove; 14. a housing main body.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

in the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

As shown in fig. 1-3, the static mixer according to an embodiment of the present invention can be made of stainless steel, titanium and titanium alloy, hastelloy, zirconium and zirconium alloy, silicon carbide, glass, peek, etc., and has better material selection and mixing adaptability. The mixer comprises a shell 1 and a mandrel 2, wherein the shell 1 comprises a hollow cylindrical shell main body 14 and an end cover 7 matched with the shell main body 14, and the structure of the cylindrical shell 1 can ensure the pressure resistance of the mixer to the maximum extent; the shell main part 14 passes through threaded connection with end cover 7, be equipped with the entry that is used for the fluid to get into static mixer on the end cover 7, be equipped with the export that is used for the fluid to flow out static mixer on the shell main part 14, be equipped with the sealing washer 11 as the sealing member between shell main part 14 and the end cover 7, the leakproofness is good, withstand voltage effect is better, static mixer does not have the welding simultaneously for static mixer can be dismantled, makes things convenient for the maintenance in later stage, and the maintenance cost is low.

The inside dabber 2 that is equipped with of casing 1, dabber 2 are equipped with preflow unit 3 in one side that is close to the inlet end, are equipped with five first helical fin 4 on the preflow unit 3 in advance, and first helical fin 4 extends to the other end along its soon to from preflow unit 3 one end and sets up to one.

One side of the pre-flow unit 3 far away from the liquid inlet end is fixedly connected with a mixing unit 5, the mixing unit 5 is provided with a plurality of second spiral fins 6, and the distance between two adjacent first spiral fins 4 is larger than the distance between two adjacent second spiral fins 6. The mixing unit 5 comprises five sub-units arranged at intervals along the axial direction of the mandrel 2, and a first annular groove 8 is arranged between every two adjacent sub-units. The second helical fin 6 is arranged into a plurality of sub-fins from one end of the sub-unit to the other end of the sub-unit along the rotating direction of the second helical fin at intervals, the sub-fins are approximately rhombic, the fluid to be mixed is cut and distributed at a rhombic acute angle, the sub-fins of the rhombic acute angle structure are weakened by the impact force of the fluid in the using process, and the fluid resistance is reduced. The second helical fins 6 form a second annular groove 13 between two sub-fins arranged at intervals along the axial direction of the mandrel 2, the groove width of the second annular groove 13 is smaller than that of the first annular groove 8, twelve second helical fins 6 are arranged between the two second annular grooves 13, the flow direction of the fluid in the mixing area is shown in fig. 6, and the arrow direction in the figure is the flow direction of the fluid.

In order to further improve the mixing effect of the fluids, the helix angle of the second helical fin 6 of the first subunit is 32.5 degrees, and the rotation directions of the second helical fins 6 of the two adjacent subunits are opposite.

The liquid inlet end and the liquid outlet end of the mandrel 2 are respectively provided with a first frustum 9 and a second frustum 10, the first frustum 9 and the second frustum 10 are both conical, the small head end of the first frustum 9 is arranged towards the inlet of the shell 1, and the small head end of the second frustum 10 is arranged towards the outlet of the shell 1.

When the static mixer works, different fluids enter the shell 1 from the left side of the static mixer at the same time, as shown in fig. 2 and fig. 3, after the fluids are divided by the first frustum 9, the cross-sectional area is reduced when the first frustum 9 is used, the flow velocity of the fluids is increased, the fluids enter the pre-dividing unit 3 at a high flow velocity, the fluids are changed into spiral fluid flow under the action of the first spiral fins 4 to be subjected to primary dividing and mixing, and the fluids are divided into a plurality of strands and enter the mixing unit 5 at the same time. The helical fluid changes the flow direction many times in a short time by colliding with the second helical fin 6, and the collision between the fluids is enhanced by performing the movement perpendicular to the axial direction of the mandrel 2 at the first annular groove 8 and the second annular groove 13, enhancing the mixing effect. After mixing is complete, they are collected by a second cone 10 and finally flow out of the static mixer.

As an alternative embodiment, as shown in fig. 4, only one sub-unit is provided on the mixing unit 5.

As an alternative embodiment, as shown in fig. 5, a heat exchange structure 12 is further sleeved outside the casing 1, an inlet and an outlet are arranged on the heat exchange structure 12, a multi-head spiral groove communicated with the inlet and the outlet is formed on an inner wall of the heat exchange structure 12, a heat exchange medium such as water, heat transfer oil, high-temperature steam and the like is introduced into the heat exchange structure 12 through the inlet, and the heat exchange medium is uniformly distributed on an outer wall of the casing 1 through the multi-head spiral groove and exchanges heat with the casing 1, so that the internal temperature of the casing 1 is adjusted, and fluid in different temperature ranges is mixed.

As an alternative embodiment, the helix angle of the second helical fin 6 of the first sub-unit is 45 degrees, the helix angle of the second helical fin 6 of the second sub-unit is 75 degrees, the helix angle of the second helical fin 6 of the third sub-unit is 25 degrees, the helix angle of the second helical fin 6 of the fourth sub-unit is 60 degrees, and the helix angle of the second helical fin 6 of the fifth sub-unit is 45 degrees. That is, the spiral angle of the second spiral fin 6 can be flexibly selected within a range of 25 to 75 degrees as required.

As an alternative embodiment, the shape of each of the first and second frustum 9, 10 may also be any one of a hemispherical shape or a stepped shape.

As an alternative embodiment, the housing 1 is a hollow cylindrical shell formed integrally, and one end of the housing 1 is provided with an inlet for fluid to enter and the other end is provided with an outlet for fluid to flow out along the axial direction.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims

1. A static mixer, comprising:

A housing (1);

Dabber (2), locate inside casing (1), dabber (2) have be close to the feed liquor end predistribution unit (3) and with mixing unit (5) of predistribution unit (3) intercommunication in advance, be equipped with a plurality of first helical fin (4) on predistribution unit (3), mixing unit (5) are equipped with a plurality of second helical fin (6), and adjacent two the interval of first helical fin (4) is greater than adjacent two the interval of second helical fin (6).

2. The static mixer according to claim 1, wherein the mixing unit (5) comprises a plurality of sub-units arranged at intervals in the axial direction of the mandrel (2), a first annular groove (8) being provided between two adjacent sub-units.

3. The static mixer according to claim 2, characterized in that said first helical fins (4) are provided in one extending along their rotation direction from one end to the other end of said pre-flow unit (3); and a plurality of sub-fins are arranged at intervals from one end to the other end of the sub-unit along the rotating direction of the second spiral fin (6).

4. The static mixer according to claim 3, characterized in that said second helical fin (6) forms a second annular groove (13) between two of said sub-fins arranged axially spaced along said mandrel (2), said second annular groove (13) having a groove width smaller than that of said first annular groove (8).

5. a static mixer according to any one of claims 2-4, wherein the second helical fins (6) of two adjacent subunits have opposite sense of rotation.

6. A static mixer according to any one of claims 1-4, wherein the helix angle of the second helical fins (6) is 25-75 degrees.

7. A static mixer according to any of the claims 1-4, wherein a first cone (9) and a second cone (10) are further provided at the inlet end and the outlet end of the spindle (2), respectively, the small end of the first cone (9) being arranged towards the inlet of the housing (1) and the small end of the second cone (10) being arranged towards the outlet of the housing (1).

8. A static mixer according to any of claims 1-4, further comprising a heat exchanging structure (12) arranged around the outside of said housing (1).

9. The static mixer according to claim 8, characterized in that the inner wall of the heat exchange structure (12) is formed with a multi-start helical groove.

10. A static mixer according to any of claims 1-4, wherein the housing (1) comprises a housing body (14) and an end cap (7) connected by a seal.