CN107715720B - Venturi mixer - Google Patents

Venturi mixer Download PDF

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Publication number
CN107715720B
CN107715720B CN201711178480.0A CN201711178480A CN107715720B CN 107715720 B CN107715720 B CN 107715720B CN 201711178480 A CN201711178480 A CN 201711178480A CN 107715720 B CN107715720 B CN 107715720B
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China
Prior art keywords
pipe
outlet
inlet
venturi mixer
shrinkage
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CN201711178480.0A
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Chinese (zh)
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CN107715720A (en
Inventor
蔡振江
高亮
李欢
张梦
索雪松
袁洪波
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Hebei Agricultural University
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Hebei Agricultural University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/40—Mixing liquids with liquids; Emulsifying
    • B01F23/45—Mixing liquids with liquids; Emulsifying using flow mixing
    • B01F23/451—Mixing liquids with liquids; Emulsifying using flow mixing by injecting one liquid into another
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
    • B01F25/3125—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof characteristics of the Venturi parts
    • B01F25/31251—Throats
    • B01F25/312512—Profiled, grooved, ribbed throat, or being provided with baffles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
    • B01F2101/32—Mixing fertiliser ingredients

Abstract

The invention discloses a venturi mixer, which comprises an inlet pipe, a venturi, a shrinkage pipe and an outlet pipe which are sequentially connected, wherein the pipe wall of the outlet pipe is communicated with a fertilizer inlet pipe; the inner diameter of the outlet of the inlet pipe is smaller than that of the inlet, the axis of the outlet and the axis of the inlet are not in the same straight line, and the outlet is connected with the throat pipe; a plurality of spiral channels are arranged on the inner wall of the shrinkage tube; the outlet pipe is communicated with the tip of the shrinkage pipe, and the communicating part of the outlet pipe and the shrinkage pipe is a wall surface perpendicular to the axis of the shrinkage pipe. The liquid of the invention reaches the minimum pressure at the outlet pipe, the speed reaches the fastest speed, at the moment, 0 pressure or even negative pressure can appear at the fertilizer inlet pipe, at the moment, the fertilizer pump is started to perform fertilizer, at the moment, the liquid fertilizer is quickly compatible with the water flow rotating at high speed at the outlet pipe, the purpose of fully mixing the fertilizer is achieved, and the mixing is uniform and the efficiency is high.

Description

Venturi mixer
Technical Field
The invention relates to the field of venturi tubes, in particular to a venturi mixer.
Background
The venturi mixer is used as an important gas-liquid or liquid-liquid mixing device and has wide application in engineering practice. A common venturi mixer is a throat-perforated classical venturi, which consists of: (1) an inlet section: a short cylindrical section of diameter D; (2) shrink section: the shape is a conical tube, and the cone angle is about 21 DEG + -2; (3) throat pipe: a short straight pipe section with a diameter of about 1/3-1/4D and a length equal to the pipe diameter; (4) diffusion section: taper pipe with taper angle of 8-15 deg. The main fluid flows through the classical venturi tube, the introducing fluid flows in through the throat opening of the venturi tube, and the introducing fluid is introduced and turbulently mixed with the main fluid by utilizing the pressure difference. In this venturi structure, since the throat region is a region where the cross-sectional area of the venturi mixer is smallest, when the mixed liquid flows through the throat, the average velocity of the mixed liquid is largest here, but the fluid near the wall surface is slow due to the existence of the boundary layer, the disturbance intensity of the mixed fluid is small, and thus problems such as uneven mixing of the two liquids and low mixing efficiency are easily caused.
There is an urgent need for a venturi mixer that solves the above-mentioned problems.
Disclosure of Invention
The invention aims to provide a venturi mixer, which solves the problems that the existing venturi tube is easy to cause uneven mixing of two liquids and low mixing efficiency.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a venturi mixer, which comprises an inlet pipe, a venturi, a shrinkage pipe and an outlet pipe which are sequentially connected, wherein the pipe wall of the outlet pipe is communicated with a fertilizer inlet pipe; the inner diameter of the outlet of the inlet pipe is smaller than that of the inlet, the axis of the outlet and the axis of the inlet are not in the same straight line, and the outlet is connected with the throat pipe; a plurality of spiral channels are arranged on the inner wall of the shrinkage tube; the outlet pipe is communicated with the tip of the shrinkage pipe, and the communicating part of the outlet pipe and the shrinkage pipe is a wall surface perpendicular to the axis of the shrinkage pipe.
Further, the spiral channel is a raised line or a groove.
Still further, the spiral path is closed from a starting position to an ending position of the shrink tube.
Still further, the number of the spiral channels is two, three, four or five.
Still further, the inlet pipe has an outlet inner diameter of 1/2 of the inlet inner diameter.
Still further, the axis of the inlet tube outlet is located directly above the axis of the inlet.
Still further, the throat, the shrinkage tube and the outlet tube are integrally formed.
A method for selecting parameters of a venturi mixer,
1) Calculation of structural parameters
Local loss equation:
can be simplified into:
from this, it is possible to obtain that the relation between pressures is velocity dependent, again because there is the formula:
the above formula can be obtained:
wherein P is 1 For venturi inlet pressure, P 2 Is the pressure at the throat, ρ is the liquid density, V 1 For inlet flow velocity, V 2 For flow velocity at throat, Z 1 Z 2 Is the vertical height; selecting d according to the formula 2 Is a value of (2);
2) Designing the venturi mixer of claim 1 and building a three-dimensional solid model;
3) Performing a simulation experiment on the number of spiral channels to determine the optimal number of spiral channels;
4) And (3) performing simulation experiments on the Venturi mixer, and determining the optimal inlet and outlet pipe diameter proportion.
Further, in step 2), the Solidworks is used for three-dimensional modeling.
Still further, the number of spiral channels is determined to be three in the step 3); and 4) determining that the pipe diameter of the outlet of the Venturi mixer is half of the pipe diameter of the inlet in the step 4).
Compared with the prior art, the invention has the following beneficial technical effects:
according to the invention, liquid flows in from the eccentric inlet pipe, the sectional area of the contraction section of the inlet pipe is reduced, the flow speed of the liquid is increased, the pressure of the liquid is reduced, the throat is reduced when the liquid reaches the throat, the speed is increased, the liquid passes through the throat, the liquid flows in the pipeline to rotate at a high speed along the spiral channel after reaching the contraction pipe, the pressure reaches the minimum value at the outlet pipe, the speed reaches the fastest speed, at the moment, 0 pressure or even negative pressure can be generated at the fertilizer inlet pipe, at the moment, the fertilizer pump is turned on to perform fertilizer, the liquid fertilizer is quickly compatible with the water flowing at the high speed at the outlet pipe at one moment, the aim of fully mixing the fertilizer is fulfilled, and the liquid fertilizer is uniformly mixed and has high efficiency.
Drawings
The invention is further described with reference to the following description of the drawings.
FIG. 1 is a perspective view of a venturi mixer of the present invention;
FIG. 2 is a right side view of the venturi mixer of the present invention;
FIG. 3 is a cross-sectional view of the venturi mixer of the present invention;
reference numerals illustrate: 1. an inlet pipe; 2. a throat; 3. a shrink tube; 4. an outlet tube; 5. a fertilizer inlet pipe; 6. spiral channel.
Detailed Description
As shown in fig. 1 to 3, a venturi mixer comprises an inlet pipe 1, a throat pipe 2, a constriction pipe 3 and an outlet pipe 4 which are connected in sequence. The wall of the outlet pipe 4 is provided with a fertilizer inlet pipe 5 for introducing fertilizer and mixing water, in this embodiment, a fertilizer inlet pipe is labeled, and in actual use, a plurality of fertilizer inlet pipes can be optionally installed, which is not limited only. The inner diameter of the outlet of the inlet pipe 1 is smaller than the inner diameter of the inlet, the axis of the outlet and the axis of the inlet are not in the same straight line, namely, the eccentric necking is realized, the axis of the outlet of the inlet pipe 1 is positioned right above the axis of the inlet, so that the pressure loss is reduced, the outlet of the inlet pipe is in threaded connection with the throat pipe 2, and specifically, a pipeline with the inner diameter of the inlet pipe is 80mm, and the inner diameter of the outlet connected with the throat pipe is shrunk to be 40mm. The throat pipe 2, the shrinkage pipe 3 and the outlet pipe 4 are integrally formed. Wherein the length of the shrinkage tube is 40mm, and the caliber of the tail end of the shrinkage tube is reduced to 10mm. The outlet pipe 4 is communicated with the tip of the shrinkage pipe 3, and the communicating part of the outlet pipe 4 and the shrinkage pipe 3 is a wall surface perpendicular to the axis of the shrinkage pipe 3. The inner wall of the shrinkage tube 3 is provided with a plurality of spiral channels 6, the spiral channels 6 are raised strips or grooves, one mode is selected, and the purpose is to enable water flow to rotate. In this particular embodiment, three spiral channels are selected based on the fluid simulation. The rotation direction of the spiral channel is the same as the rotation direction of the water pump impeller. In actual use, different water pumps are selected according to the needs, different spiral line eccentric angles (different blades) are adopted, and the best spiral water outlet effect (high speed and priority) is selected according to fluid simulation of different depths (widths).
When the venturi mixer is used, liquid flows in from the eccentric inlet pipe 1, the contraction section of the inlet pipe 1 is reduced in cross section area, the liquid flow speed is accelerated, the liquid pressure is reduced, when the venturi mixer reaches the position of the throat pipe 2, the throat pressure is reduced, the speed is increased, the liquid passes through the throat pipe 2, after reaching the contraction pipe 3, water flows in a pipeline along the spiral path to rotate at a high speed, the pressure reaches the minimum value at the position of the outlet pipe 4, the speed reaches the fastest speed, at this time, 0 pressure or even negative pressure can occur at the position of the fertilizer inlet pipe 5, at this time, the fertilizer pump is turned on to perform fertilizer application, and at one moment, the liquid fertilizer is quickly compatible with the water flow rotating at the high speed at the position of the outlet pipe 4, so that the aim of fully mixing fertilizer is fulfilled.
A method for selecting parameters of a venturi mixer,
1) Calculation of structural parameters
Local loss equation:
can be simplified into:
thereby can be used forThe relationship between the resulting pressures is velocity dependent, again because there is the formula:
the above formula can be obtained:
wherein P is 1 For venturi inlet pressure, P 2 Is the pressure at the throat, ρ is the liquid density, V 1 For inlet flow velocity, V 2 For flow velocity at throat, Z 1 Z 2 Is the vertical height; determining the appropriate d 2 Values.
2) According to the requirement on accurate fertilizer preparation in the water and fertilizer integration, the design requirement meets the following requirements:
(1) Care is taken in designing the venturi to reduce pressure losses.
(2) The water flow speed at the water outlet is increased to the greatest extent so as to meet the requirement of fully mixing water and fertilizer.
(3) Changing the water outlet mode from normal water outlet to spiral water outlet.
(4) Meets certain pressure requirements and works normally under high pressure.
(5) The outlet cannot be too small to prevent clogging.
(6) Has longer service life and can inhibit cavitation erosion to a certain extent.
(7) Proper spiral angle and spiral pattern width and height.
(8) The throat and the expansion section are removed, so that the water flow is subjected to spiral treatment, and the water and fertilizer are fully mixed to the maximum extent.
In order to meet the above requirements, the venturi mixer of the present patent is designed, the pressure loss of the venturi tube can be reduced by the inlet tube part, the water outlet state can be changed by the throat tube 2, the shrinkage tube 3 and the outlet tube 4, and the water outlet flow rate can be increased. Building a three-dimensional entity model by using Solidworks; the design firstly utilizes an inlet pipe structure which is eccentric upwards, and aims to reduce the pressure loss. After the shrinkage pipe with the threaded passage is used, the speed of the water flowing through the shrinkage pipe can be further increased, the water is discharged into a spiral shape, and at the moment, the fertilizer is applied by the fertilizer applying pump, so that the fertilizer and high-speed spiral water flow mutually impact, and the aim of fully mixing the fertilizer is fulfilled.
3) And (3) carrying out a simulation experiment on the number of the spiral channels to determine the optimal number of 6 spiral channels, namely three spiral channels.
4) And (3) performing simulation experiments on the Venturi mixer to determine the optimal overall inlet-outlet pipe diameter proportion, and specifically determining that the outlet pipe diameter of the Venturi mixer is half of the inlet pipe diameter, namely that the inlet inner diameter of the Venturi mixer is 80mm and the outlet inner diameter is 40mm. The design breaks through the rule that the diameters of the inlet and outlet pipe diameters of the classical venturi pipes are consistent, and compared with the traditional venturi pipes, the outlet pipe diameter is reduced to half, so that the water flow speed is increased, and the fertilizer is fully mixed.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.

Claims (8)

1. A venturi mixer, characterized by: the device comprises an inlet pipe (1), a throat pipe (2), a shrinkage pipe (3) and an outlet pipe (4) which are connected in sequence, wherein the pipe wall of the outlet pipe (4) is communicated with a fertilizer inlet pipe (5); the inner diameter of an outlet of the inlet pipe (1) is smaller than the inner diameter of the inlet, the axis of the outlet and the axis of the inlet are not in the same straight line, and the outlet is connected with the throat pipe (2); a plurality of spiral channels (6) are arranged on the inner wall of the shrinkage tube (3), the number of the spiral channels (6) is two, three, four or five, and the spiral channels (6) are cut off from the starting position to the ending position of the shrinkage tube (3); the outlet pipe (4) is communicated with the tip of the shrinkage pipe (3), and the communicating part of the outlet pipe (4) and the shrinkage pipe (3) is a wall surface perpendicular to the axis of the shrinkage pipe (3).
2. The venturi mixer of claim 1, wherein: the spiral channel (6) is a raised line or a groove.
3. The venturi mixer of claim 1, wherein: the inner diameter of the outlet of the inlet pipe (1) is 1/2 of the inner diameter of the inlet.
4. The venturi mixer of claim 1, wherein: the axis of the outlet of the inlet pipe (1) is positioned right above the axis of the inlet.
5. The venturi mixer of claim 1, wherein: the throat pipe (2), the shrinkage pipe (3) and the outlet pipe (4) are integrally formed.
6. A method for selecting parameters of a venturi mixer, comprising:
1) Calculation of structural parameters
Local loss equation:
can be simplified into:
from this, it is possible to obtain that the relation between pressures is velocity dependent, again because there is the formula:
the above formula can be obtained:
wherein P is 1 For venturi inlet pressure, P 2 Is the pressure at the throat, ρ is the liquid density, V 1 For inlet flow velocity, V 2 For flow velocity at throat, Z 1 Z 2 Is the vertical height; selecting d according to the formula 2 Is a value of (2);
2) Designing the venturi mixer of claim 1 and building a three-dimensional solid model;
3) Performing a simulation experiment on the number of spiral channels to determine the optimal number of spiral channels (6);
4) And (3) performing simulation experiments on the Venturi mixer to determine the optimal overall inlet and outlet pipe diameter proportion.
7. The method for selecting parameters for a venturi mixer according to claim 6, wherein: three-dimensional modeling was performed using Solidworks in step 2).
8. The method for selecting parameters for a venturi mixer according to claim 6, wherein: determining the number of spiral channels (6) to be three in the step 3); and 4) determining that the pipe diameter of the outlet of the Venturi mixer is half of the pipe diameter of the inlet in the step 4).
CN201711178480.0A 2017-11-23 2017-11-23 Venturi mixer Active CN107715720B (en)

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Application Number Priority Date Filing Date Title
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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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CN107715720A CN107715720A (en) 2018-02-23
CN107715720B true CN107715720B (en) 2023-11-21

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10864495B1 (en) * 2018-08-03 2020-12-15 Tullia Zucca Cavitation apparatus, configured to perform multiple simultaneous cavitations
CN108939970B (en) 2018-08-15 2020-04-21 乔登卫浴(江门)有限公司 Microbubble obtaining device
CN113996533A (en) * 2021-10-29 2022-02-01 苏多帝 Fertilizer sieving mechanism with retrieve fertility

Citations (9)

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JP2006247619A (en) * 2005-03-14 2006-09-21 Sony Corp Two fluid nozzle and cleaning apparatus
US7299707B1 (en) * 2006-07-17 2007-11-27 Dieterich Standard, Inc. Eccentric venturi flow meter
CN201007617Y (en) * 2006-11-24 2008-01-16 袁友嵩 Rotational flow water mixer
CN102696330A (en) * 2012-05-05 2012-10-03 西北农林科技大学 Novel venturi fertilizer absorber
CN202666717U (en) * 2012-05-30 2013-01-16 江门市江海区雷迅太阳能科技有限公司 Spiral jet mixer
CN203178168U (en) * 2013-02-28 2013-09-04 中国石油天然气股份有限公司 Device for testing high-temperature erosion performance of oil well tubular column
CN103446902A (en) * 2012-05-29 2013-12-18 江门市江海区雷迅太阳能科技有限公司 Spiral jet mixer
CN204294399U (en) * 2014-12-13 2015-04-29 杭州隆达真空设备有限公司 A kind of injector nozzle assembly
CN206577612U (en) * 2017-02-20 2017-10-24 杨子江 The venturi mixer of spiral deflector is contained in a kind of throat

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006247619A (en) * 2005-03-14 2006-09-21 Sony Corp Two fluid nozzle and cleaning apparatus
US7299707B1 (en) * 2006-07-17 2007-11-27 Dieterich Standard, Inc. Eccentric venturi flow meter
CN201007617Y (en) * 2006-11-24 2008-01-16 袁友嵩 Rotational flow water mixer
CN102696330A (en) * 2012-05-05 2012-10-03 西北农林科技大学 Novel venturi fertilizer absorber
CN103446902A (en) * 2012-05-29 2013-12-18 江门市江海区雷迅太阳能科技有限公司 Spiral jet mixer
CN202666717U (en) * 2012-05-30 2013-01-16 江门市江海区雷迅太阳能科技有限公司 Spiral jet mixer
CN203178168U (en) * 2013-02-28 2013-09-04 中国石油天然气股份有限公司 Device for testing high-temperature erosion performance of oil well tubular column
CN204294399U (en) * 2014-12-13 2015-04-29 杭州隆达真空设备有限公司 A kind of injector nozzle assembly
CN206577612U (en) * 2017-02-20 2017-10-24 杨子江 The venturi mixer of spiral deflector is contained in a kind of throat

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