Interlayer-type weak-flow fluctuation online mixing apparatus

Abstract

The invention discloses interlayer-type weak-flow fluctuation online mixing apparatus. The apparatus comprises a water inlet cylinder, a pesticide mixer outer cylinder, a pesticide feeder, a turbulentflow generator and a water outlet cylinder which are in threaded connection in sequence; the water inlet cylinder is provided with a water inlet which is in threaded connection with a water inlet pipe; the water outlet cylinder is provided with a solution outlet which is in threaded connection with a spray head or a water pipe; the pesticide mixer outer cylinder is internally provided with a support frame, a dispersion-type pesticide permeation device and a surrounding-type pesticide injection device; the dispersion-type pesticide permeation device sleeves the outer side of the surrounding-type pesticide injecting device and is in interference fit with the surrounding-type pesticide injecting device; the supporting frame is clamped with the pesticide mixing device outer cylinder and the dispersion-type pesticide permeation device; and the pesticide feeder is connected with the surrounding-type pesticide injection device through a rubber pipe.

Description

technical field [0001] The invention relates to an online drug mixing device capable of effectively reducing fluctuations in the mixing concentration of liquid medicine, in particular to a sandwich type online mixing device 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, while improving the uniformity of online mixing of pesticides and water, it is also necessary to minimize the instability of the mixture concentration caused by the fluctuation of the injection flow rate. An efficient online drug mixer should be able to mix the drug solution evenly in real time, while avoiding a lot of current-carrying energy loss. [0003] For the direct nozzle injection pesticide online mixing spray system, a single nozzle needs to be equipped with a corresponding mixing device to improve the uniformity of the pestici...

AI Technical Summary

Problems solved by technology

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

The existing liquid medicine online mixing device also fails to solve the problem of instability of the mixed solution 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 as the flow rate decreases, so it is difficult for the system to ensure the uniformity of online mixing under the condition of small flow rate, and the drug mixer does not consider the negative impact of injection flow fluctuation on 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 radially distributed drug inlet holes are beneficial to improve the uniformity, 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 low flow rates, and the device does not consider injection Drug flow fluctuation problem

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, and multiple components The way the substances are mixed, so it will inevitably cause a large energy loss, and the device also does not consider the fluctuation of the injection flow

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 through the separation and recombination of the fluid flow, the device also has the disadvantages of complex structure and large energy loss, and cannot alleviate the instability of the mixing concentration caused by the fluctuation of the solute flow

[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 with the decrease of the carrier flow rate, and the mixing effect is insufficient.

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

[0006] The pulsation attenuation technologies 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. The system is difficult to apply to the fluctuation suppression of 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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