Venturi fertilizing device

Abstract

The invention relates to the technical field of agricultural fertilization and irrigation, in particular to a Venturi fertilization device capable of realizing water and fertilizer integrated precise irrigation, which comprises a contraction section (1), a throat pipe section (2), a diffusion section (3) and a fertilizer suction section (4), in the liquid inlet direction, the contraction section (1) sequentially comprises a straight pipe section (5) and an inclined pipe section (6) from front to back; the rear end of the contraction section (1) is connected with the front end of the throat pipe section (2), and the rear end of the throat pipe section (2) is directly connected with the front end of the expansion section (3); the contraction section (1) is communicated with the expansion section (3) through the throat pipe section (2); an inlet groove pipe is arranged at the upper part of the throat pipe section (2), and the lower part of the throat pipe section (2) is communicated with the fertilizer suction section (4); in the liquid inlet direction, the diffusion section (3) sequentially comprises a curve section (7) and a straight pipe section (5) from front to back; and the longitudinal section of the curve section (7) of the diffusion section (3) is an upper arc curve right-angle quadrangle. According to the device, the fertilizer absorption efficiency is improved, and the fertilizer absorption performance is enhanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of agricultural fertilization irrigation technology, and relates to a Venturi fertilizer device capable of realizing water and fertilizer integrated precision irrigation. BACKGROUND

[0002] The Venturi fertilizer device is widely used in irrigation systems. The device sucks in fertilizers through negative pressure generated at the throat and mixes the fertilizers with the fluid in the main pipeline, so as to realize water and fertilizer integration. Due to the necking process of the throat, when the water flow passes through the contraction section of the Venturi tube, the water cross section is reduced and the flow rate is increased, which continuously reduces the pressure. When the pressure is lower than the saturated vapor pressure, the negative pressure cavitation is generated at the throat. The cavitation causes the fertilizer suction flow of the fertilizer device to have an upper limit value, which is the maximum fertilizer suction flow.

[0003] The traditional Venturi fertilizer device, as shown in FIG. 1, includes a contraction section 1, a throat section 2, a diffusion section 3 and a fertilizer suction section 4. Among them, Figure 1

[0004] Along the liquid inlet direction, the contraction section 1 sequentially includes a straight pipe section 5 and an inclined pipe section 6 from front to back.

[0005] The rear end of the contraction section 1 is connected to the front end of the throat section 2. Along the liquid inlet direction, the throat section 2 sequentially includes a throat groove section 8 and a throat straight pipe section 9 from front to back. The rear end of the throat straight pipe section 9 of the throat section 2 is connected to the front end of the diffusion section 3. The contraction section 1 is in communication with the diffusion section 3 through the throat section 2. The upper part of the throat groove section 8 of the throat section 2 is provided with an inlet groove pipe, and the lower part of the throat groove section 8 is in communication with the fertilizer suction section 4. The contraction section 1 is symmetrical up and down and has a central symmetry axis in the middle. The diffusion section 3 is symmetrical up and down and has a central symmetry axis in the middle. The liquid inlet diameter of the contraction section 1 is greater than the liquid outlet diameter of the contraction section 1. The longitudinal section of the inclined pipe section 6 of the contraction section 1 is isosceles trapezoidal. The diameter of the throat straight pipe section 9 is the same as the liquid outlet diameter of the rear end of the contraction section 1.

[0006] The “P”-shaped Venturi fertilizer device, as shown in FIG. 2, includes a contraction section 1, a throat section 2, a diffusion section 3 and a fertilizer suction section 4. Among them, Figure 2 Along the liquid inlet direction, the contraction section 1 sequentially includes a straight pipe section 5 and an inclined pipe section 6 from front to back.

[0007]

[0008] ​​The rear end of the contraction section 1 is connected with the front end of the throat section 2, and the throat section 2 comprises a throat groove section 8 and a throat straight section 9 from front to back along the liquid inlet direction. The rear end of the throat straight section 9 of the throat section 2 is connected with the front end of the diffusion section 3. The contraction section 1 is communicated with the diffusion section 3 through the throat section 2. The upper part of the throat groove section 8 of the throat section 2 is provided with an inlet groove pipe, and the lower part of the throat groove section 8 is communicated with the fertilizer suction section 4. The diameter of the liquid inlet of the contraction section 1 is larger than the diameter of the liquid outlet of the contraction section 1. The longitudinal section of the inclined pipe section 6 of the contraction section 1 is a right-angled trapezoid with a straight line in the upper part and an upper inclined line in the lower part.

[0009] The diameter of the liquid inlet of the diffusion section 3 is smaller than the diameter of the liquid outlet of the diffusion section 3, and the longitudinal section of the diffusion section 3 is an eccentric curve type quadrilateral, which comprises a first straight line in the upper part, a second straight line vertically extending downwards from the front end point of the first straight line, a third straight line vertically extending downwards from the rear end point of the first straight line, and a curve line connecting the lower end points of the second straight line and the third straight line. The included angle between the rear end of the curve line and the third straight line is an acute angle. SUMMARY

[0010] The present application aims to provide a Venturi fertilizer device with reduced water head loss and improved fertilizer suction performance.

[0011] In order to achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0012] A Venturi fertilizer device, comprising a contraction section 1, a throat section 2, a diffusion section 3 and a fertilizer suction section 4;

[0013] The contraction section 1 comprises a straight pipe section 5 and an inclined pipe section 6 from front to back along the liquid inlet direction;

[0014] The rear end of the contraction section 1 is connected with the front end of the throat section 2, and the throat section 2 comprises a throat groove section 8 and a throat straight section 9 from front to back along the liquid inlet direction. The rear end of the throat straight section 9 of the throat section 2 is connected with the front end of the diffusion section 3. The contraction section 1 is communicated with the diffusion section 3 through the throat section 2. The upper part of the throat groove section 8 of the throat section 2 is provided with an inlet groove pipe, and the lower part of the throat groove section 8 is communicated with the fertilizer suction section 4. The diameter of the liquid inlet of the contraction section 1 is larger than the diameter of the liquid outlet of the contraction section 1. The longitudinal section of the inclined pipe section 6 of the contraction section 1 is a right-angled trapezoid with a straight line in the upper part and an upper inclined line in the lower part.

[0015] The diffusion section 3 comprises a curve section 7 and a straight pipe section 5 from front to back along the liquid inlet direction;

[0016] The longitudinal section of the curved section 7 of the diffusion section 3 is an upper arc curved right-angled quadrilateral, which comprises a first straight lower edge, a second straight edge perpendicular to the first straight edge and extending upward from the front end point of the first straight edge, a third straight edge perpendicular to the first straight edge and extending upward from the rear end point of the first straight edge, and an upper curved edge connecting the upper end points of the second straight edge and the third straight edge; the angle between the rear end of the upper curved edge and the third straight edge is a right angle, and the angle between the front end of the upper curved edge and the second straight edge is an obtuse angle.

[0017] The diameter of the liquid inlet of the contraction section 1 is greater than the diameter of the liquid outlet of the contraction section 1.

[0018] The longitudinal section of the inclined pipe section 6 of the contraction section 1 is a right-angled trapezoid with a straight upper part and an upper inclined lower part.

[0019] The diameter of the liquid inlet of the diffusion section 3 is smaller than the diameter of the liquid outlet of the diffusion section 3.

[0020] The upper curved edge of the upper arc curved right-angled quadrilateral is tangent to the front end of the straight pipe section 5 of the diffusion section 3.

[0021] The diameter of the rear end of the throat pipe section 2 is greater than the diameter of the liquid outlet of the rear end of the contraction section 1.

[0022] Compared with the prior art, the beneficial effects of the present application are as follows:

[0023] Unlike the traditional symmetric type Venturi fertilizer applicator, the upper arc curved type Venturi fertilizer applicator of the present application has no central symmetry axis, the cross section of the inclined pipe section is a right-angled trapezoid, and the cross section of the curved section is an upper arc curved right-angled quadrilateral. This eccentric structure reduces the energy loss of the internal structure. Unlike the "P" shaped Venturi fertilizer applicator, the throat pipe straight pipe section 9 is removed, which better adapts to the flow state transition after the throat pipe; the lower part of the diffusion section adopts a straight line connection, which reduces energy loss and reduces cavitation; after the water flows through the upward inclined contraction section, there is a vertical upward flow trend, and the upper part of the diffusion section adopts an upper arc curved connection to smoothly guide the water flow into the diffusion section, reducing energy loss. In order to reduce the diffusion angle of the upper part of the diffusion section, the upper part adopts a circular arc curved connection, and the curve is tangent to the outlet straight section of the fertilizer applicator, so that the diffusion angle of the diffusion section gradually decreases, and the vertical upward flow trend is gradually corrected to horizontal flow, improving the flow state of the upper half of the diffusion section, reducing the multi-directional velocity collision, producing smaller vorticity, and reducing energy loss.

[0024] The upper arc curved structure of the present application reduces the energy loss of liquid flow and has a higher utilization rate of negative pressure. The maximum fertilizer suction flow rate is 3317 l / h, which is about 40% higher than the maximum fertilizer suction flow rate 2382 l / h of the traditional Venturi fertilizer applicator, and about 25% higher than the maximum fertilizer suction flow rate 2650 l / h of the "P" shaped Venturi fertilizer applicator, thereby improving the fertilizer suction efficiency and enhancing the fertilizer suction performance. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of a traditional Venturi fertilizer application device;

[0026] Figure 2 This is a schematic diagram of the overall structure of a "P"-shaped Venturi fertilizer applicator.

[0027] Figure 3 This is a schematic diagram of the overall structure of the Venturi fertilizer applicator of the present invention;

[0028] Figure 4 This is a schematic diagram of the longitudinal section of the invented Venturi fertilizer application device;

[0029] Figure 5 This is a schematic diagram of the working state of the invented Venturi fertilizer application device.

[0030] The reference numerals in the attached figures are:

[0031] 1. Constriction segment 2. Throat segment

[0032] 3. Diffusion section 4. Fertilizer absorption section

[0033] 5. Straight pipe section 6. Inclined pipe section

[0034] 7. Curved section; 8. Throat groove section

[0035] 9. Straight section of the trachea Detailed Implementation

[0036] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0037] like Figure 3 As shown, a Venturi fertilizer applicator of the present invention includes: a contraction section 1, a throat section 2, a diffusion section 3, and a fertilizer absorption section 4;

[0038] Along the liquid inlet direction, the contraction section 1 consists of a straight pipe section 5 and an inclined pipe section 6 from front to back.

[0039] The rear end of the constriction section 1 is connected to the front end of the throat section 2, and the rear end of the throat section 2 is directly connected to the front end of the diffuser section 3. The constriction section 1 is connected to the diffuser section 3 through the throat section 2. The upper part of the throat section 2 is provided with an inlet groove tube, and the lower part of the throat section 2 is connected to the fertilizer suction section 4.

[0040] The diameter of the inlet of the contraction section 1 is larger than the diameter of the outlet of the contraction section 1. The longitudinal section of the inclined tube segment 6 of the contraction section 1 is a right trapezoid with a straight upper part and an upward inclined lower part.

[0041] Along the liquid inlet direction, the diffuser section 3 includes, from front to back, a curved section 7 and a straight pipe section 5.

[0042] The inlet diameter of the diffuser section 3 is smaller than the outlet diameter of the diffuser section 3, and the longitudinal section of the curved segment 7 of the diffuser section 3 is an upper arc-curved right-angled quadrilateral. This quadrilateral includes a lower first straight side, a second straight side perpendicular to the first straight side and extending upwards from the front end of the first straight side, a third straight side perpendicular to the first straight side and extending upwards from the rear end of the first straight side, and an upper curved side connecting the upper ends of the second and third straight sides. The rear end of the upper curved side forms a right angle with the third straight side, and the front end of the upper curved side forms an obtuse angle with the second straight side.

[0043] Preferably, the upper curved edge is a circular arc.

[0044] The upper curved side of the upper arc-shaped right quadrilateral is tangent to the front end of the straight pipe section 5 of the diffuser section 3.

[0045] The diameter of the rear end of the throat segment 2 is larger than the diameter of the liquid outlet at the rear end of the constriction segment 1.

[0046] like Figure 4 As shown, the Venturi fertilizer applicator of the present invention, along the liquid inlet direction, comprises, in sequence, a straight pipe section 5 with a length of L and a rectangular cross-section, and an inclined pipe section 6 with a length of L2 and a right-angled trapezoidal cross-section. The diameters of the liquid inlet and outlet of the straight pipe section 5 are D, the diameter of the liquid inlet of the inclined pipe section 6 is D, and the diameter of the liquid outlet of the inclined pipe section 6 is d1.

[0047] Preferably, L is 40mm, L2 is 53mm, and the contraction angle α of the contraction section is 23.5°.

[0048] L2 is determined by the pipe diameter D, d1 and the contraction angle α. The fertilizer absorption performance is better when the contraction angle is 23.5°.

[0049] Preferably, the diameter d1 of the liquid outlet of the contraction section 1 is 17 mm.

[0050] The inlet diameter D of the contraction section 1 is equal to the outlet diameter D of the diffuser section 3. The inlet diameter D of the contraction section 1 and the outlet diameter D of the diffuser section 3 are both 40 mm.

[0051] Preferably, the length L1 of the inlet groove of the throat section 2 is 4mm, the diameter d of the inlet groove is 27mm, and the diameter d2 of the throat outlet is 20mm.

[0052] Preferably, the diameter d3 of the fertilizer suction port of the fertilizer suction section 4 is 27mm.

[0053] Preferably, the upper side of the diffuser section 3 adopts a curved structure, the length L3 of the diffuser section 3 is 210 mm, and the initial diffusion angle β of the diffuser section 3 is 11°.

[0054] Comprehensive Venturi fertilizer performance indicators and the relationship between the axial length of the diffusion section, the axial length of the diffusion section is 210mm, the fertilizer performance indicators of the fertilizer applicator are better. At this time, the initial diffusion angle β is 11°

[0055] The working process of the application is:

[0056] Figure 5 is the working state diagram of the invented Venturi fertilizer device.

[0057] The core component of the Venturi fertilizer applicator is the Venturi tube, which is a variable diameter pipeline with gradually increasing and then decreasing. The water flow enters the contraction section from the inlet section, and then is contracted to the throat section by the eccentric structure. The eccentric structure reduces the energy loss of the internal structure and has a more optimal structure for reducing energy loss.

[0058] When the water flow passes through the throat section, the flow rate increases and the pressure decreases due to the Venturi effect, forming a local negative pressure. The liquid fertilizer in the fertilizer tank is sucked into the pipe from the fertilizer suction section under the action of atmospheric pressure, and flows into the diffusion section with the water flow.

[0059] In the diffusion section, the vertical flow trend of the water flow is gradually converted into horizontal flow due to the action of the circular arc upper wall. This process relieves the collision between the water flow and the pipe wall, reduces the energy loss, and fully mixes with the liquid fertilizer. The mixed fertilizer solution is transported to the irrigation area for fertilization.

[0060] The maximum fertilizer suction flow of the invented Venturi fertilizer device is 3317l / h, which is about 40% higher than the maximum fertilizer suction flow of the traditional Venturi fertilizer applicator (2382l / h), and about 25% higher than the maximum fertilizer suction flow of the "P" shaped Venturi fertilizer applicator (2650l / h).

Claims

1. A Venturi fertilizer applicator characterized by: The device comprises a contraction section (1), a throat section (2), a diffusion section (3) and a fertilizer suction section (4); In the liquid inlet direction, the contraction section (1) comprises a straight pipe section (5) and an inclined pipe section (6) from front to back; The rear end of the contraction section (1) is connected with the front end of the throat section (2), the rear end of the throat section (2) is directly connected with the front end of the diffusion section (3); the contraction section (1) is communicated with the diffusion section (3) through the throat section (2); the upper part of the throat section (2) is provided with an inlet groove pipe, and the lower part of the throat section (2) is communicated with the fertilizer suction section (4); In the liquid inlet direction, the diffusion section (3) comprises a curved section (7) and a straight pipe section (5) from front to back; The longitudinal section of the curved section (7) of the diffusion section (3) is an upper arc curved right-angled quadrilateral, which comprises a first straight line in the lower part, a second straight line vertically extending upwards from the front end point of the first straight line, a third straight line vertically extending upwards from the rear end point of the first straight line, and an upper curved line connecting the upper end points of the second straight line and the third straight line; the angle between the rear end of the upper curved line and the third straight line is a right angle, and the angle between the front end of the upper curved line and the second straight line is an obtuse angle.

2. The Venturi fertilizer device according to claim 1, characterized in that: The diameter of the liquid inlet of the contraction section (1) is larger than the diameter of the liquid outlet of the contraction section (1).

3. The Venturi fertilizer device according to claim 1, characterized in that: The longitudinal section of the inclined pipe section (6) of the contraction section (1) is a right-angled trapezoid with a straight line in the upper part and an upper inclined line in the lower part.

4. The Venturi fertilizer device according to claim 1, characterized in that: The diameter of the liquid inlet of the diffusion section (3) is smaller than the diameter of the liquid outlet of the diffusion section (3).

5. The Venturi fertilizer device according to claim 1, characterized in that: The upper curved line of the upper arc curved right-angled quadrilateral is tangent to the front end of the straight pipe section (5) of the diffusion section (3).

6. The Venturi fertilizer device according to claim 1, characterized in that: The diameter of the rear end of the throat section (2) is larger than the diameter of the liquid outlet of the rear end of the contraction section (1).

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