Medicine mixer for sandwich-type weak-flow fluctuation online mixing device

Abstract

The invention discloses a medicine mixer for a sandwich-type weak-flow fluctuation online mixing device. The medicine mixer comprises a medicine mixer outer barrel, a diffusion type medicine percolation device and a winding type medicine injector, wherein the diffusion type medicine percolation device comprises a medicine percolation layer which is arranged in sequence in a sleeving manner; the medicine percolation layer comprises a lining with a lining hole and a medicine injection thin film with a micropore; the lining comprises a lining inner layer and a lining outer layer and one end of the lining inner layer and one end of the lining outer layer are fixedly connected to form an inner cavity; a wedge-shaped end part is arranged at a fixed connection end and a lining end part is arranged at the other end; the medicine injection thin film comprises an inner film and an outer film of the medicine injection thin film, and one end of the inner film and one end of the outer film are fixedly connected to form an inner cavity; an outer end part and an inner end part are correspondingly arranged at free ends; the medicine injection thin film is arranged in the lining inner cavity and the end part of the medicine injection thin film is folded to be fitted to the lining end part; the winding type medicine injector comprises an annular end cover, a medicine injection main path and an annular branch path; the winding type medicine injector is arranged on the inner cavity of the medicine injection thin film and is in interference fit with the lining end part to fix the medicine injection thin film; the annular branch path is provided with a medicine injection hole an the medicine injection main path is provided with a medicine injection inlet. The medicine mixer disclosed by theinvention has a good mixing effect.

Description

technical field [0001] The invention relates to the field of an online drug mixing device capable of effectively reducing fluctuations in the mixing concentration of pesticides, in particular to a sandwich type drug mixer with weak flow fluctuations applied to an online pesticide mixing and spraying system. Background technique [0002] In order to ensure the accuracy of pesticide deposition and distribution required for precision spraying, it is necessary to minimize the instability of the mixture concentration caused by the fluctuation of the injection flow rate while improving the uniformity of the online mixing of pesticides and water. An efficient online drug mixer should be able to mix the drug solution evenly in real time, and at the same time avoid more loss of current-carrying energy. [0003] For the direct nozzle injection type pesticide online mixing spray system, the single nozzle needs to be equipped with a corresponding mixing device to improve the uniformity ...

AI Technical Summary

Problems solved by technology

For the metering pump, there is a case of low speed when the medicine is supplied at a small flow rate; for the indirect medicine supply of the solenoid valve, the medicine supply is also discontinuous due to the duty cycle in a single pulse output cycle; therefore, in the pesticide supply system, the flow rate Volatility is hard to avoid

The existing liquid medicine online mixing device also fails to solve the problem of instability of the mixed liquid concentration caused by the fluctuation of the medicine supply flow

In addition, the existing pesticide on-line mixing devices are mostly used in the occasions where the carrier (water) flow rate is large, and often use methods such as circular tube jets and promotion of spiral flow to promote mixing. However, in the actual application of the drug mixer, especially In the direct nozzle injection type pesticide online mixing spray system, the flow rate of a single nozzle is sometimes very small, and the turbulent flow is not fully developed under the condition of small Reynolds number, and the effect of spiral flow mixing and circular tube jet mixing is not ideal.

[0004] For example, Chinese patent, application number 200910101373.7, title of invention: synchronous injection type drug mixer for sprayer, this device and similar devices have an independent system to supply pesticide and water mixing, all adopt jet flow to realize negative pressure suction and spiral blade to promote mixing, mixing The effect decreases with the decrease of the carrying current (water) flow rate, so the system cannot guarantee the uniformity of online mixing under the condition of small carrying current flow rate, and the drug mixer does not consider the negative impact of the fluctuation of the pesticide flow rate on the mixing at all.

Another example is the Chinese patent, application number 201610220373.9, the name of the invention: a composite static mixer, which welds the inlet conduit and the blade together, relies on the conduit to add additives in the radial direction, and relies on the blade to roll the fluid to promote mixing, although The solute injection holes distributed along the radial direction are beneficial to improve the uniformity of mixing, but the device mainly relies on the helical blade to promote the mixing, so the efficiency of uniform mixing of various solutes and solvents will be reduced at a low carrier (solvent) amount , the device does not consider the problem of solute flow fluctuation

Other static mixing devices, such as Chinese patent 201610918892.2, invention name: static mixer, and Chinese patent 201710832962.7, invention name: static jet mixer, use a special static mixing device structure arranged behind the entrance, forcing a variety of The way in which the components are mixed will inevitably cause a large loss of carrier (solvent) energy, and the device also does not consider the problem of injection flow fluctuations

Another example is the Chinese patent 201080010750.7, the name of the invention: coaxial compact static mixer and its use, which uses multiple coaxial mixing stages to assemble to form a cascaded static mixing device, which divides the overall flow channel to form small flow channels , mixing by fluid flow separation and recombination, this device also has the disadvantages of complex structure and large energy loss, and cannot alleviate the instability of mixing concentration caused by solute flow fluctuations

[0005] Although negative pressure drug inhalation and compressed gas drug supply can eliminate flow pulsation, there are still many limitations in the application of related inventions, such as it is difficult to ensure the stability of pressure and the accuracy of drug supply rate

For example, Chinese patent, application number: 201510079179.9, invention name: a movable drug mixer, in which the drug bag is concentrated on the drug mixing device to realize the integration of drug supply and mixing, relying on negative pressure to draw the drug solution, the drug supply device Although it can ensure that the inflow of pesticides is basically stable, there is a defect that the mixing concentration cannot be precisely controlled. In this invention, the efficiency of the spiral flow generating device will also decrease as the flow rate of the carrier current (water) decreases, and the mixing effect is insufficient.

Another example is the Chinese patent, application number: 201510083070.2, name: a fixed drug mixer, and this device also has problems similar to the inability to overcome fluctuations in the injection flow rate and the inability to solve the problem of mixing uniformity under the condition of a low carrier (water) flow rate

[0006] The pulsation attenuation techniques commonly used in some fluid damping systems, such as small-deflection deformed thin plates, or porous plates, or cavity shock absorbers, are often suitable for fluid pressure suppression at medium and high frequencies, and the weakening effect on flow fluctuations is not obvious enough. and more bulky

For example, Chinese patent, application number 201610115344.6, patent name: a flow pulsation attenuator with adjustable frequency, this structure attenuates pressure and flow pulsation through a spring mass system, the structure is complex, difficult to operate, and difficult to miniaturize

Another example is the Chinese patent, application number 201610311919.1, patent name: a full-band hydraulic system pressure pulsation suppression method, the device uses elastic walls to reduce high-frequency pressure pulsations, and uses plug-in series-parallel H-type filters to reduce low-frequency vibrations. On the one hand, the structure is complex, on the other hand, it cannot eliminate the large flow fluctuations at low frequencies

Another example is the Chinese patent, application number: 201410026386.3, patent name: broadband variable pressure pressure pulsation attenuator, this device uses accumulators and orifice plates to avoid pressure pulsations, and high-pressure gas is used to charge the accumulators, so the device The system is difficult to apply to the fluctuation suppression of the injection flow in the online mixing system with small flow

[0007] In short, there is still a lack of a method in the field of online drug mixing that can efficiently promote the online uniform mixing of pesticides and water, reduce the fluctuation of the injection flow rate, and improve the stability of the outflow concentration of the drug-water mixture. On-line mixing device under the condition of carrying current and small flow

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