CN116391697A - Fluid regulator for sprayer pesticide application valve main pipeline - Google Patents

Abstract

The invention discloses a fluid regulator for a main pipeline of an application valve of a sprayer, which is used for regulating the flow velocity distribution of fluid in a pipeline section and comprises regulating blades, a pipeline and a flange, wherein the regulating blades comprise contraction blades, inner contraction pipes, outer contraction pipes, radial blades, inner radial pipes and outer radial pipes. The shrink blades, the inner shrink tube and the outer shrink tube are arranged at the front end in the pipeline to divide the space in the pipeline into a plurality of front-end fluid channels. The radial blades, the inner radial pipe and the outer radial pipe are arranged at the inner rear end of the pipeline to divide the space in the pipeline into a plurality of rear end fluid channels. The radial blades and the contraction blades are arranged in a circumferential array along the axial direction of the pipeline. The rear end fluid channel is tightly connected with the front end fluid channel, and the inlet structural parameters of the rear end fluid channel are consistent with the outlet structural parameters of the front end fluid channel. The fluid regulator provided by the invention adopts a front-end and rear-end two-stage regulating structure, which is beneficial to accelerating the irregular flow field to tend to be stable.

Description

Fluid regulator for sprayer pesticide application valve main pipeline

Technical Field

The invention relates to the technical field of fluid rectification, in particular to a fluid regulator for a main pipeline of an application valve of a sprayer.

Background

Variable application systems are increasingly being used in sprayers to achieve uniformity of application of pesticides. The current mainstream field variable pesticide application technical scheme is that a processor adjusts the pesticide application amount according to a vehicle speed sensor, a flow sensor carries out feedback adjustment, a flow signal acquired by the flow sensor is inaccurate, and the accuracy of the pesticide application amount is directly affected. The flow sensor commonly used in agriculture is a turbine flow sensor, and the measurement accuracy and reliability of the turbine flow sensor are directly related to the flow state of the fluid in the pipeline. Because of the turbulence pieces such as the bent pipe, the branch pipe and the like exist between the pipelines, when fluid reaches the turbine flow sensor, the phenomena of uneven unsteady flow such as larger speed distribution distortion and rotating flow exist, and the rotation of the rotor of the turbine flow sensor is influenced. Therefore, the fluid regulator is arranged at the front end of the flow sensor, so that the accuracy of flow measurement is improved, and the accurate regulation of the drug application process is facilitated.

Representative fluid regulators at home and abroad currently comprise vane type, orifice plate type, combined type and other structures. Representative vane-type structures are radial vane-type fluid regulators, the volume, weight, pressure loss and the like of which are reduced, but the vanes in the pipe wall area are sparse, which is not beneficial to rectification. Representative orifice plate structures are Laws structure and Zanker structure, and the regulator has short length, small volume, small flow area and large pressure loss. The combined structure refers to a blade type and hole plate type combined structure. The fluid regulator can not quickly rectify the complex flow field under a plurality of bent pipes, and a new technical scheme is needed to solve the problems in order to meet the measurement accuracy of the fluid in the main pipeline of the sprayer.

Disclosure of Invention

Aiming at the problems, the invention designs a fluid regulator for a main pipeline of a spraying machine pesticide application valve, which aims at solving the problems of rapid rectification of a flow field under complex conditions such as a plurality of bent pipes, branch pipes and the like, improving the rectification effect and improving the measurement accuracy of a turbine flow sensor. The technical scheme of the invention is as follows: the fluid regulator for the main pipeline of the pesticide application valve of the sprayer comprises a contraction blade, wherein the contraction blade is arranged at the front end in a pipeline; radial blades; an inner shrink tube; an outer shrink tube; an inner radial tube; an outer radial tube; a pipe having an inner diameter D; a flange for inserting medicine valve main line, characterized by:

the shrink blades are arranged in a circumferential array along the axis of the pipeline;

further, the contraction blades, the inner contraction tube and the outer contraction tube divide the space in the pipeline into a plurality of front-end fluid channels, the contraction angle theta of the contraction blades is 1.3 degrees, and the length L is the length L ₁ Satisfies 2D is less than or equal to L ₁ ≤2.5D；

Further, the shrinkage angle 2δ of the inner and outer shrink tubes is 1.3 °, the length is equal to the shrinkage blade, the inner and outer shrink tube lengths L ₁ The same satisfies that 2D is less than or equal to L ₁ ≤2.5D；

Further, the front end fluid channel inlet flow area is greater than the front end fluid channel outlet flow area;

further, the radial blades are arranged at the rear end in the pipeline;

further, the radial blades are arranged in a circumferential array along the axial direction of the pipeline;

further, the radial blades, the inner radial pipe and the outer radial pipe divide the space in the pipeline into a plurality of rear end fluid channels, and the rear end fluid channels have the same length and the length L ₂ Satisfies 0.5D is less than or equal to L ₂ ≤D；

Further, the rear end fluid channel is tightly connected with the front end fluid channel, and the inlet size structural parameter of the rear end fluid channel is consistent with the outlet size structural parameter of the front end fluid channel;

further, the back-end fluid channel inlet flow area is equal to the back-end fluid channel outlet flow area;

further, the flange may be connected to the main line of the dispensing valve.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, two-stage structures of the shrinkage blade, the inner shrinkage tube, the outer shrinkage tube, the radial blade, the inner radial tube and the outer radial tube are designed according to the fully developed fluid section speed distribution rule and the distribution state of the multi-elbow lower flow field. The diameter of the main pipeline of the spraying machine pesticide applying valve is generally 32CM, the spraying machine pesticide applying valve belongs to a small-caliber pipeline, the fluid regulator is manufactured by adopting high-strength nylon and applying a 3D printing technology, and the spraying machine pesticide applying valve is integrally formed, high in structural strength and light in weight.

Further, according to actual conditions, the main pipeline of the spraying machine pesticide applying valve is positioned at the rear parts of the flow regulating valve, the reflux valve and the like, the flow regulating valve is rapidly opened and closed to generate water hammer and cavitation, a large number of bubbles are generated to influence the measuring accuracy of the flowmeter, and even cavitation is generated to damage the rotor of the flow sensor. The shrinkage blades, the inner shrinkage tube and the outer shrinkage tube divide the space in the pipeline into a plurality of front-end fluid channels, the negative influence caused by cavities is minimized by reducing the tiny flow area, and secondary flow vortex and large-scale vortex in the fluid are eliminated to a great extent.

Further, radial blades are arranged in parallel with the axis of the pipeline, the pipeline space is divided into a plurality of rear-end fluid channels by combining an inner radial pipe and an outer radial pipe, the fluid at the outlet of the shrinkage blade is received at the inlet of the radial blades, the fluid at the inner shrinkage pipe and the fluid at the outer shrinkage pipe are received at the inner radial pipe and the outer radial pipe respectively, the vortex in the fluid is further eliminated, the speed distortion of the flow field is greatly eliminated, and the flow field at the outlet of the adjustment blade is a uniform and centrosymmetric flow field.

Further, compared with a common vane type fluid regulator, the number of vanes is increased in the pipe wall area of the pipeline, and the rectifying effect on fluid near the pipe wall is effectively enhanced.

Drawings

FIG. 1 is a schematic illustration of a fluid regulator for a main line of a sprayer dispensing valve in accordance with the present invention;

FIG. 2 is a schematic view of the internal vanes of the pipeline of the fluid regulator for the main pipeline of the sprayer dosing valve according to the present invention;

FIG. 3 is a schematic view in section from A-A of FIG. 2;

FIG. 4 is a schematic view in section in the B-B direction of FIG. 2;

FIG. 5 is a schematic view of the contracting blade and radial blade at C of FIG. 2;

FIG. 6 is a schematic view of the inner shrink tube and inner radial tube of FIG. 2;

FIG. 7 is a schematic diagram of the structure of the branch pipeline and the main pipeline of the spraying machine pesticide applying valve;

FIG. 8 is a cloud of pipe velocity profiles at section 1 of FIG. 7 without a fluid regulator installed;

FIG. 9 is a cloud of duct velocity profiles at section 2 of FIG. 7 after installation of a fluid regulator with radial blades for both the regulator blades;

FIG. 10 is a cloud of pipe velocity profiles at section 2 of FIG. 7 after installation of the present invention;

in the figure, 101, adjusting the blade; 102. a flange; 103. a pipe; 201. an inner shrink tube; 202. an outer shrink tube; 203. shrinking the blade; 204. radial blades; 205. an outer radial tube; 401. an inner radial tube.

Detailed Description

In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments that are illustrated in the appended drawings.

Referring to fig. 1, a fluid regulator for a main pipeline of an application valve of a sprayer comprises:

the adjusting blade 101, the pipeline 103 and the flange 102 are made of high-strength nylon materials, and are integrally formed by using a 3D printing technology, so that the adjusting blade 101, the pipeline 103 and the flange 102 are high in structural strength and light in weight. The inner diameter of the pipeline 103 is D, is the same as the inner diameter of a main pipeline of a corresponding sprayer pesticide application valve, and is connected with the main pipeline of the sprayer pesticide application valve through the flange 102.

Referring to fig. 2, the tuning blade 101 includes an inner shrink tube 201, an outer shrink tube 202, shrink blades 203, an inner radial tube 410, an outer radial tube 205, and radial blades 204. The inner shrink tubing 201, outer shrink tubing 202 and shrink blades 203 are disposed at the inner front end of the tubing 103, the shrink blades 203 being arranged in a circumferential array along the axis of the tubing 103. The inner radial pipe 410, the outer radial pipe 205 and the radial blades 204 are arranged at the inner rear end of the pipeline 103, and the radial blades 204 are arranged in a circumferential array along the axial direction of the pipeline 103. Compared with the common vane type fluid regulator, the number of vanes is increased in the pipe wall area of the pipeline 103, and the rectifying effect on the fluid near the pipe wall is effectively enhanced.

Referring to fig. 3, 5 and 6, the inner shrink tube 201, the outer shrink tube 202 and the shrink blades 203 divide the space in the pipe 103 into a plurality of front end fluid channels E, the shrink angle θ of the shrink blades 203 is 1.3 °, and the length L is ₁ Satisfies 2D is less than or equal to L ₁ 2.5D, the contraction angle 2delta of the inner contraction tube 201 and the outer contraction tube 202 is 1.3 degrees, and the length is equal to the length L of the contraction blades, the inner contraction tube and the outer contraction tube ₁ The same satisfies that 2D is less than or equal to L ₁ And less than or equal to 2.5D. The inlet flow area of the front-end fluid channel E is larger than the outlet flow area of the front-end fluid channel E. The designed inner shrink tube 201, outer shrink tube 202, shrink blades 203 minimize negative effects of cavitation by reducing the tiny flow area while largely eliminating secondary flow eddies and large scale eddies in the fluid.

Referring to fig. 3 and 4, the inner radial tube 410, the outer radial tube 205, and the radial blades 204 divide the space within the pipe 103 into a plurality of rear-end fluid passages F, and the radial blades (204), the inner radial tube (401), and the outer radial tube (205) have the same length and length L ₂ Satisfies 0.5D is less than or equal to L ₂ And D is less than or equal to D, and the rear-end fluid channel F is tightly connected with the front-end fluid channel E. The inlet structure parameters of the rear-end fluid channel F are consistent with the outlet structure parameters of the front-end fluid channel E, and the inlet flow area of the rear-end fluid channel F is equal to the outlet flow area of the rear-end fluid channel F. The radial blades 204 are arranged in parallel with the axis of the pipeline 103, the inlet of each radial blade 204 receives the fluid at the outlet of the corresponding shrinkage blade 201, the inner radial pipe 401 and the outer radial pipe 205 respectively receive the fluid at the inner shrinkage pipe 201 and the outer shrinkage pipe 202, the vortex in the flow field is further eliminated, the speed distortion of the flow field is greatly eliminated, the outlet flow field of the blade 101 is regulated to be a uniform and centrosymmetric flow field, the complex flow field under a plurality of bent pipes can be rectified rapidly, and the measurement accuracy of the turbine flow sensor is improved.

Referring to fig. 2 to 10, the contraction angle of the contraction blade (203), the inner contraction tube (201) and the outer contraction tube (202) is 1.3 DEG, and the length L is set ₁ Is 2D. The radial blade (204)) Length L of inner radial tube (401) and outer radial tube (205) ₂ Set to 0.5D. After the invention is arranged on the section 1, the fluid velocity distribution after the invention is arranged is more close to the fully developed section velocity distribution, and the unique structural design of the invention ensures that the velocity distribution is in a step-decreasing state from the center of the circular pipe to the periphery, thereby meeting the requirements of the turbine flow sensor on the fluid state.

Claims (2)

1. The fluid regulator for the main pipeline of the spraying machine pesticide application valve is characterized by comprising a regulating blade (101), a pipeline (103) and a flange (102), wherein the regulating blade (101) comprises a contraction blade (203), an inner contraction pipe (201), an outer contraction pipe (202), a radial blade (204), an inner radial pipe (401) and an outer radial pipe (205), the contraction blade (203), the inner contraction pipe (201) and the outer contraction pipe (202) are arranged at the inner front end of the pipeline (103) to divide the inner space of the pipeline (103) into a plurality of front end fluid channels E; the flow area of the inlet of the front-end fluid channel E is larger than that of the outlet of the front-end fluid channel E; the radial blades (204), the inner radial pipe (401) and the outer radial pipe (205) are arranged at the inner rear end of the pipeline (103) to divide the inner space of the pipeline (103) into a plurality of rear end fluid channels F; the rear end fluid channel F is tightly connected with the front end fluid channel E, the inlet structural parameter of the rear end fluid channel F is consistent with the outlet structural parameter of the front end fluid channel E, and the inlet flow area of the rear end fluid channel F is equal to the outlet flow area of the rear end fluid channel F. The flanges (102) are arranged at two ends of the pipeline (103) and are used for being connected with a main pipeline of the spraying machine pesticide application valve.

2. A fluid regulator for a main line of a sprayer dosing valve according to claim 1, characterized in that said conduit (103) has an internal diameter D; the contraction angle of the contraction blade (203), the inner contraction tube (201) and the outer contraction tube (202) is 1.3 DEG, the lengths are the same and the length L ₁ Satisfies 2D is less than or equal to L ₁ Less than or equal to 2.5D; the radial blades (204), the inner radial tube (401) and the outer radial tube (205) have the same length and the length L ₂ Satisfies 0.5D is less than or equal to L ₂ ≤D。

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