CN110665662A - A spray head with uniform fog volume and large spray angle - Google Patents

Abstract

The invention relates to a spray head with uniform fog amount and large spray angle in the technical field of plant protection machinery, which comprises a spray head shell and a spray head core; the nozzle core is cylindrical and is inserted into the second stepped hole in a radial interference fit mode, and the outer edge of the end of the spraying side shaft of the nozzle core is abutted against the stepped surface of the third stepped hole; the two positions of the outer peripheral surface of the nozzle core, which correspond to the diameter, are respectively provided with a pair of spiral grooves with the same rotating direction, and the spiral grooves spirally extend from the shaft end of the water inlet side of the nozzle core to the shaft end of the spraying side and are at least spirally wound for 180 degrees; the nozzle core is coaxially provided with a central hole in a penetrating manner, the central hole consists of a small central hole and a large central hole, the small central hole and the large central hole are sequentially communicated according to the flow direction of water, two side holes transversely and oppositely penetrating in a direction perpendicular to the axis are formed in the large central hole, and the two side holes are respectively communicated with the bottoms of the spiral grooves. Can obviously improve the uniformity of fog quantity distribution and ensure the prevention and control effect.

Description

A spray head with uniform fog volume and large spray angle

technical field

The invention relates to the technical field of plant protection machinery, in particular to an atomizing nozzle.

Background technique

The nozzle is the most important part of the atomized liquid medicine. The liquid medicine atomizes the liquid into fine mist droplets under the action of pressure, and sprays it on the surface of the crops to control diseases, pests and weeds. The uniformity of droplet distribution on the crop surface is a key factor affecting the control effect. In practical applications, in order to solve the uniformity of droplet distribution, a combination of multiple nozzles is used according to the spray characteristics of the nozzles, such as the fan-shaped spray nozzles used in the boom sprayer. , There are few edges, and the fog volume of adjacent nozzles is used to overlap the edges during installation to increase the edge fog volume, so that the fog volume distribution in the entire control area can be evenly distributed. For the equipment that uses a single nozzle, such as manual sprayers, electric sprayers and orchard sprayers, cone spray nozzles are used, and the atomization distribution characteristics are less in the middle and more edges (as shown in Figure 4). The combination also cannot achieve uniform fog application, which seriously affects the control effect.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a spray head with a uniform fog volume and a large spray angle, which can significantly improve the uniformity of the fog volume distribution.

The purpose of the present invention is to achieve in this way: a spray head with a uniform mist volume and a large spray angle, comprising a spray head shell and a spray head core;

The nozzle shell is sequentially connected with a first stepped hole, a second stepped hole and a third stepped hole along the axial direction from the installation port to the spray port;

The nozzle core is cylindrical, and is inserted into the second stepped hole in a radial interference fit, and the outer edge of the shaft end on the spray side abuts the stepped surface of the third stepped hole;

A pair of spiral grooves with the same direction of rotation are respectively set on the outer peripheral surface of the nozzle core at two places corresponding to the diameters, and the spiral grooves spirally extend from the shaft end of the water inlet side of the nozzle core to the shaft end of the outlet side, and at least 180 degrees. ;

A central hole is arranged coaxially through the nozzle core. The central hole is composed of a small central hole and a large central hole. The small central hole and the large central hole are connected in sequence according to the flow direction of the water flow. Two side holes intersecting with the axis transversely, and the two side holes respectively communicate with the groove bottoms of a pair of spiral grooves.

Further, the diameter of the central small hole is the same as that of the two side holes, which is 0.2-0.3 times the diameter of the central large hole.

Further, the length of the central small hole is equal to 0.1-0.2 times the depth of the central large hole.

Further, the communication port between the side hole and the central large hole is close to the rear of the central large hole.

Further, the cross section of the spiral groove is a rectangle with an outward opening and rounded corners.

Further, the diameter of the side hole is equal to 0.2-0.4 times the height of the rectangular section of the helical groove.

Further, the injection port of the central large hole is a conical hole that opens outward.

The beneficial effects of the present invention are:

1) Mainly use the spiral groove of the nozzle core and the center hole to divide the liquid medicine into two paths, one of which enters the spiral groove, and the other enters the center hole. Moreover, due to the two sides of the hole, the liquid medicine is small from the center at a high speed. The hole is ejected into the large central hole, and the medium with lower pressure in the large central hole is sucked away, so that a negative pressure is formed near the small central hole, so that part of the liquid in the spiral groove is sucked into the large central hole through the holes on both sides. In the hole, the liquid in the central small hole and part of the liquid in the spiral groove are mixed at the rear end of the central large hole, and the speed is balanced, and flows to the nozzle hole of the nozzle shell. The fog volume in the middle part makes the fog volume distribution uniform;

2) The prevention and control effect can be guaranteed, and there is no need to use a combination of multiple nozzles, and only a single nozzle can achieve uniform distribution of the mist, and the cost has been reduced.

Description of drawings

FIG. 1 is an assembly diagram of the present invention.

Figure 2 is a schematic diagram of the structure of the nozzle core.

FIG. 3 is a schematic longitudinal cross-sectional view of the nozzle core.

FIG. 4 is a schematic diagram of the distribution of fog volume in the prior art.

FIG. 5 is a schematic diagram of the fog amount distribution in this embodiment.

In the figure, 1 nozzle shell, 1a first step hole, 1b second step hole, 1c third step hole, 2 nozzle core, 201 center hole, 201a center hole, 201b center hole, 202 spiral groove, 203 side hole .

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

Referring to Figures 1-3, it can be seen that a nozzle with a large spray angle and a uniform mist volume includes a nozzle shell 1 and a nozzle core 2, and the nozzle shell 1 is a round shell structure.

The nozzle housing 1 is connected with a first stepped hole 1a, a second stepped hole 1b, a third stepped hole 1c, a first stepped hole 1a, a second stepped hole 1b, a third stepped hole 1a, a second stepped hole 1b, a third stepped hole The stepped holes 1c are all cylindrical holes.

The nozzle core 2 has a cylindrical shape and is inserted into the second stepped hole 1b in a radial interference fit, and the outer edge of the shaft end on the spray side abuts the stepped surface of the third stepped hole 1c.

A pair of helical grooves 202 with the same direction of rotation are respectively provided on the outer peripheral surface of the above-mentioned nozzle core 2 at two places corresponding to the diameters. Spend.

A central hole 201 is formed coaxially through the nozzle core 2, and the central hole 201 is composed of a small central hole 201a and a large central hole 201b. The two side holes 203 are transversely crossed perpendicular to the axis, and the two side holes 203 are respectively connected to the groove bottoms of the pair of spiral grooves 202 .

The diameter of the central small hole 201a and the two side holes 203 is the same, which is 0.2-0.3 times the diameter of the central large hole 201b.

The length of the central small hole 201a is equal to 0.1-0.2 times the depth of the central large hole 201b.

The communication port between the side hole 203 and the central large hole 201b is close to the rear of the central large hole 201b.

The cross section of the above-mentioned spiral groove 202 is a rectangle with an outward opening and rounded corners.

The diameter of the side hole 203 is equal to 0.2-0.4 times the height of the rectangular section of the helical groove 202 .

The injection port of the large central hole 201b is a conical hole that opens outward.

It works as follows:

The liquid medicine with a certain pressure is divided into two paths after entering the nozzle shell 1;

All the way into the spiral groove 202 of the nozzle core 2, the liquid medicine rotates along the spiral groove 202 and generates a large centrifugal force, and then sprays out, so that the sprayed liquid liquid particles have two speeds: one is parallel to the center line of the nozzle shell 1 The forward speed of , and the second is the tangential speed of high-speed rotation. The combined speed of the two is the actual movement direction of the liquid particles, forming an angle α with the center line, and 2α is the spray angle. At this time, the amount of fog formed is mainly concentrated. in the circumferential direction;

The other way enters the center hole 201 of the nozzle core 2, and the liquid medicine is ejected from the center small hole 201a at a relatively high speed, enters the center large hole 201b, and sucks away the medium with lower pressure in the center large hole 201b, A negative pressure is formed near the central small hole 201a, so that part of the medicinal liquid in the spiral groove 202 is sucked into the central large hole 201b through the holes 203 on both sides, and the liquid in the central small hole 201a and the part of the liquid in the spiral groove 202 are in the central large hole 201b. The rear end of the nozzle is mixed, and the speed is balanced, and it flows to the nozzle hole of the nozzle shell 1. At this time, the amount of mist formed is mainly concentrated in the middle part to make up for the amount of mist in the middle part, so that the distribution of the mist amount is uniform.

The following technical effects are obtained in this embodiment: a comparative test is carried out on the original nozzle and the improved nozzle (with holes 203 on both sides added), and under the same spray angle (90°) and flow rate (4L/min), the The fog volume distribution curve is shown in Figure 4 and Figure 5. The variation coefficient of uneven distribution is reduced from the original 83.1% to 24.34%, which significantly improves the fog volume distribution and improves the control effect.

The above are the preferred embodiments of the present invention, and those of ordinary skill in the art can also carry out various transformations or improvements on this basis. Without departing from the general concept of the present invention, these transformations or improvements should belong to the claimed protection of the present invention. within the range.

Claims (7)

1. The utility model provides an even big spray angle shower nozzle of fog volume, includes shower nozzle shell (1), shower nozzle core (2), its characterized in that:

the nozzle shell (1) is sequentially communicated with a first stepped hole (1a), a second stepped hole (1b) and a third stepped hole (1c) with gradually reduced diameters from an axial mounting opening to a nozzle;

the nozzle core (2) is cylindrical, is inserted into the second stepped hole (1b) in a radial interference fit mode, and the outer edge of the shaft end of the spraying side of the nozzle core abuts against the stepped surface of the third stepped hole (1 c);

two positions of the outer peripheral surface of the nozzle core (2) corresponding to the diameter are respectively provided with a pair of spiral grooves (202) with the same rotating direction, and the spiral grooves (202) spirally extend from the shaft end of the water inlet side of the nozzle core (2) to the shaft end of the spraying side and are at least spirally wound for 180 degrees;

the coaxial centre bore (201) of seting up that runs through on shower nozzle core (2), centre bore (201) comprises central aperture (201a), central macropore (201b), central aperture (201a), central macropore (201b) communicate according to the rivers flow direction in proper order, sets up two side openings (203) that the axis of perpendicular to transversely worn in central macropore (201b), and two side openings (203) communicate the tank bottom of a pair of helicla flute (202) respectively.

2. The spray head of claim 1 having a uniform high spray angle, wherein: the diameter of the central small hole (201a) is the same as that of the two side holes (203), and is 0.2-0.3 times of that of the central large hole (201 b).

3. The spray head of claim 1 having a uniform high spray angle, wherein: the length of the central small hole (201a) is equal to 0.1-0.2 times the depth of the central large hole (201 b).

4. The spray head of claim 1 having a uniform high spray angle, wherein: the communication port of the side hole (203) and the central large hole (201b) is close to the rear part of the central large hole (201 b).

5. The spray head of claim 1 having a uniform high spray angle, wherein: the section of the spiral groove (202) is a rectangle with an outward opening and rounded corners.

6. The spray head of claim 5 having a uniform high spray angle, wherein: the diameter of the side hole (203) is equal to 0.2-0.4 times of the height of the rectangular section of the spiral groove (202).

7. The spray head of claim 1 having a uniform high spray angle, wherein: the jet orifice of the central big hole (201b) is a conical hole with an outward opening.

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