CN2629831Y

CN2629831Y - Back-flow stepless variable spray head device

Info

Publication number: CN2629831Y
Application number: CN 03265117
Authority: CN
Inventors: 傅泽田; 史岩; 祁力钧; 梁安波; 郑志安
Original assignee: China Agricultural University
Current assignee: China Agricultural University
Priority date: 2003-06-06
Filing date: 2003-06-06
Publication date: 2004-08-04
Anticipated expiration: 2013-06-06

Abstract

The utility model discloses a back-flow stepless variant sprinkler head device, which mainly comprises a valve cap (1), a valve body (4) and a nozzle body (5), wherein the valve body (4) is provided with a rubber diaphragm (3) pressed tight by the valve cap (1); the needle valve (6) and the rubber diaphragm (3) divides the valve body (4) into the upper cavity and the lower cavity; the needle valve (6) passes and is fixed onto the rubber diaphragm (3); the upper part of the needle valve (6) is provided with a pressure regulating spring (2); the lower end of the needle valve (6) is provided with an axial triangle groove (16) and forms a section-variant back-flow hole with the round hole of the valve body (4); the nozzle body is (5) arranged on the lower part of the valve body (4) and form the vortex chamber and then indirectly controls the mist amount of the praying hole through control over the amount of the back-flow liquid. The utility model has the benefiting effect that a stepless adjustment of the mist spraying amount by a large degree is conducted with the change in the spraying pressure, thereby better meeting the requirement for variant mist spraying, and the structure is simple.

Description

Reverse-flow type stepless variable ejecting device

Technical field

The utility model relates to a kind of reverse-flow type stepless variable ejecting device, is mainly used in the reverse-flow type stepless variable ejecting device of soups such as large and medium-sized engine-driven atomiser spraying pesticide or bactericide, also can be used with other spraying mechanical.

Technical background

Be applied to the big of medicine liquid spray operations such as agricultural chemicals or bactericide at present, the used ejecting device of medium-sized engine-driven atomiser, mostly be the quantitation nozzle device, corresponding certain certain atomisation pressure has a metastable flow, and keep spray pattern preferably, these ejecting devices are suitable for quantitatively spraying operation continuously under certain atomisation pressure, shower nozzle gross area in spraying swath quantitatively sprays continuously in operation process, can not be according to the variation variable rate spray of the variation of dispenser clarification of objective and the unit speed of travel, make the validity of the agricultural chemicals of throwing in be difficult to guarantee, cause the waste and the environmental pollution of soup.For realizing variable rate spray, many engine-driven atomisers adopt the change atomisation pressure to change discharge rate, and example increases discharge rate to increase pressure.But existing quantitation nozzle, a plurality of discharge rate grades have been divided into by the discharge rate size, when the shower nozzle of each discharge rate grade changes in a big way at atomisation pressure, example pressure changes 1～6 pressure rating (bar), spray amount amplitude of variation very little (discharge rate change 1～2.5 times), and spray pattern changes thereupon, flow has increase but droplet diminishes slightly when atomisation pressure increases, flow diminishes the droplet change greatly when atomisation pressure reduces, and can not change spray amount by a relatively large margin.Other has a kind of equipment of small motor spraying machine spray gun shower nozzle, under certain atomisation pressure, rotate its Adjusting bolt Adjusting screw and can change its spray amount by a relatively large margin, hour spray pattern is better but it is at discharge rate, along with its discharge rate transfers the change of big range increase droplet big, the spray pattern variation.

Summary of the invention

The purpose of this utility model is that a kind of reverse-flow type stepless variable ejecting device will be provided, this device in less pressure limit along with the variation of atomisation pressure stepless variable spraying by a relatively large margin.

Comprise valve gap 1 in order to reach the technical scheme that the purpose of this utility model adopts, valve body 4, nozzle body 5, it is characterized in that: the rubber diaphragm 3, the needle-valve body 6 that are compressed by valve gap 1 are installed in valve body 4, rubber diaphragm 3 is separated into two chambeies up and down to valve body 4, needle-valve body 6 passes and is fixed on the rubber diaphragm 3, pressure spring 2 is equipped with in needle-valve body 6 tops, needle-valve body 6 bottoms have triangular slot and match with the circular hole of valve body 4 and form the variable cross-section return port, nozzle body 5 is installed in the bottom of valve body 4, and constitutes the minor air cell with valve body 4;

In the above-mentioned reverse-flow type stepless variable ejecting device, valve body 4 bottoms are processed with spherical concave surface A (13), and nozzle body 5 tops are processed with spherical concave surface B (14), and nozzle body 5 constitutes the ball-type minor air cell with relative installation of two concave surfaces of valve body 4; Concave surface A13 and concave surface B14 also can be frustum type or other pattern, and two concave surfaces are installed the minor air cell that constitutes other pattern relatively.

In the above-mentioned reverse-flow type stepless variable ejecting device, needle-valve body 6 bottoms are along circumferentially being distributed with 2～6 axial triangular grooves.

The beneficial effects of the utility model are, along with the variation of atomisation pressure its spray amount of step-less adjustment by a relatively large margin, can satisfy the requirement of variable rate spray preferably, and simple in structure.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is the structural representation of the utility model reverse-flow type stepless variable ejecting device;

Fig. 2 is a valve body front view of the present utility model;

Fig. 3 is a valve body vertical view of the present utility model;

Fig. 4 is a nozzle body front view of the present utility model;

Fig. 5 is a nozzle body vertical view of the present utility model;

Fig. 6 is a needle-valve body front view of the present utility model;

Fig. 7 is the A-A cutaway view of Fig. 6.

Among the figure: 1. valve gap, 2. pressure spring, 3. rubber diaphragm, 4. valve body pressure spring, 5. nozzle body, 6. needle-valve body, 7. flat shim, 8. nut, 9. look nut, 10. pad, 11. inlets, 12. liquid return hole, 13. concave surface A, 14. concave surface B, 15. spray orifices, 16. axial triangular grooves.

The specific embodiment

Referring to figs. 1 through Fig. 7, this installs mainly by valve gap 1, pressure spring 2, and rubber diaphragm 3, valve body 4, nozzle body 5, needle-valve body 6, look nut 9 is formed.Rubber diaphragm 3 is installed on valve body 4 and compresses by valve gap 1, needle-valve body 6 passes rubber diaphragm 3 and fastening with it with flat shim 7 and nut 8, pressure spring 2 is equipped with in needle-valve body 6 tops, look nut 9 is in order to adjust the pretightning force of pressure spring 2, needle-valve body 6 lower ends have axial triangular groove 16, axially triangular groove 16 forms the variable cross-section return port with the circular hole of valve body 4, and nozzle body 5 is threaded with valve body 4 and forms the spherical swirl chamber chamber, and rubber diaphragm 3 is separated into two chambeies up and down to valve body 4.Soup with certain pressure is after inlet 11 enters the minor air cell, and a part of soup is from spray orifice 15 ejections of nozzle body 5, and another part soup flows back to spray tank through return port from liquid return hole 12.The upwards active force that produces when rubber diaphragm 3 cavity of resorption fluid pressures is during greater than the pretightning force of epicoele pressure spring 2, pushing rubber diaphragm 3 upwards protrudes out and drives needle-valve body 6 and moves up, the return port sectional area that the circular hole of needle-valve body 6 lower end triangle slot parts and valve body 4 forms diminishes, return port backflow soup reduces, increase from spray orifice 15 ejection soups, the active force that makes progress of the big more generation of rubber diaphragm 3 cavity of resorption fluid pressures is big more, pressure spring 2 decrements are just big more, needle-valve body 6 amounts of moving up are big more, the return port sectional area is more little, the backflow soup is few more, and many more from spray orifice ejection soup, discharge rate is big more.Otherwise when atomisation pressure reduced, the active force that makes progress that fluid pressure produces was more little, and the return port channel cross-sectional area increases, and the backflow soup is many more, and few more from spray orifice ejection soup, discharge rate is more little.The mobile of needle-valve body 6 is feedback signal with soup pressure, changes linear moving with atomisation pressure, by the amount of liquid medicine of the indirect control of control backflow amount of liquid medicine from the spray orifice ejection.Because when atomisation pressure changed, the return port channel cross-sectional area changed thereupon, the backflow amount of liquid medicine changes, and changes from spray orifice ejection amount of liquid medicine, so stepless variable spraying by a relatively large margin.

With reference to Fig. 2 to Fig. 5, valve body 4 bottoms are processed with concave surface A13 in the present embodiment, nozzle body 5 tops are processed with concave surface B14, nozzle body 5 is installed in the bottom of valve body 4, two concave surfaces are installed relatively and are constituted the ball-type minor air cell, also can be processed into concave surface A and concave surface B the concave surface of frustum type or other pattern, two concave surfaces are installed relatively and are constituted the minor air cell.In actual production, the diameter of spray orifice 15 can be processed into different size, looks different sprayings and requires and use instead.

With reference to Fig. 6 and Fig. 7, needle-valve body 6 lower ends are processed with 4 axial triangular grooves 16 in the present embodiment, also can be processed into 2～6 vee gutters, and concrete size such as triangular groove bar number, the triangular groove degree of depth and width and needle-valve body bottom diameter is determined on a case-by-case basis.

It should be noted last that, above embodiment is only unrestricted in order to the explanation the technical solution of the utility model, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement the technical solution of the utility model, and not breaking away from the spirit and scope of technical solutions of the utility model, it all should be encompassed in the middle of the claim scope of the present utility model.

Claims

1, a kind of reverse-flow type stepless variable ejecting device, comprise valve gap (1), valve body (4), nozzle body (5), it is characterized in that: the rubber diaphragm (3) that is compressed by valve gap (1) is installed in valve body (4), needle-valve body (6), rubber diaphragm (3) is separated into two chambeies up and down to valve body (4), needle-valve body (6) passes and is fixed on the rubber diaphragm (3), pressure spring (2) is equipped with in needle-valve body (6) top, needle-valve body (6) bottom has triangular slot and matches with the circular hole of valve body (4) and forms the variable cross-section return port, nozzle body (5) is installed in the bottom of valve body (4), and constitutes the minor air cell with valve body (4).

2, reverse-flow type stepless variable ejecting device according to claim 1, it is characterized in that: valve body (4) bottom is processed with spherical concave surface A (13), nozzle body (5) top is processed with spherical concave surface B (14), and nozzle body (5) constitutes the ball-type minor air cell with relative installation of two concave surfaces of valve body (4).

3, reverse-flow type stepless variable ejecting device according to claim 2 is characterized in that: concave surface A (13) and concave surface B (14) are frustum type or other pattern.

4, reverse-flow type stepless variable ejecting device according to claim 1 is characterized in that: needle-valve body (6) bottom is along circumferentially being distributed with 2～6 axial triangular grooves.