JPH07163918A - Spray method and device - Google Patents

Abstract

PURPOSE: To prevent the blockage and clogging of a nozzle even when viscous liquid or suspension is atomized by feeding the viscous liquid or suspension to a nozzle bore of a nozzle and also feeding gas toward an outlet from an inclined bore to the nozzle bore. CONSTITUTION: An atomizer is essentially constituted of a nozzle 2 having a nozzle bore 10 and a gas feed line 26 in fluid communication with the nozzle bore 10. And on actuation of the nozzle 2, gas is fed into the nozzle bore 10 from the gas feed line 26. In this way, liquid is carried away by gas at the nozzle 2 to prevent the nozzle 2 from being clogged by the liquid. At this time, the gas is fed toward an outlet 12 of the nozzle 2 from an inclined bore 38. Viscous Liquid or suspension 4 is fed to the nozzle 2 from a tank 6 through a liquid feed line 8. Further, in gas and liquid feed lines 26 and 8, pressure gages 42, 40 are arranged respectively, and a servo valve 28 for adjusting the flow rate of the gas and the like are controlled by a control unit 44.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a spraying method and a sprayer.

[0002]

2. Description of the Related Art Conventionally, a method of automatically controlling a sprayer equipped with a nozzle to spray a viscous liquid or suspension is known.

[0003]

The nozzles of previously known atomizers often become clogged when used to atomize relatively viscous liquids or suspensions. This clogging of the nozzle is especially troublesome when the atomizer is being controlled automatically. In such a case, the intermediate work of cleaning the nozzle by interrupting the work automatically performed must be performed regularly. Water is generally used to clean the nozzles, for which a separate water tank must be provided. Even with this regular cleaning, the nozzle may sometimes be clogged with particles such as dust, which leads to failure of the sprayer.

An object of the present invention is to provide a spraying method capable of preventing a waiting time from being caused by nozzle clogging and cleaning.

Another object of the present invention is to provide a sprayer which prevents the nozzles from being clogged or clogged.

[0006]

A spraying method according to the present invention comprises a step of supplying a viscous liquid or suspension to a nozzle having a nozzle hole; the liquid or suspension being passed through the nozzle hole. Flowing; supplying gas to the nozzle; supplying the gas from at least one inclined hole to the nozzle hole through which the liquid or suspension flows, in the direction of the outlet of the nozzle hole. A step of capturing the liquid or suspension by the gas so as to prevent clogging or clogging of the nozzle and transporting the liquid or suspension to the outlet of the nozzle.

The atomizer according to the present invention includes a nozzle having an outlet; a nozzle hole provided in the nozzle; at least one gas communicating with the nozzle hole and supplying gas to the nozzle hole during spraying. A supply line; and a servo valve that communicates with the nozzle hole and adjusts the flow rate of the gas to the nozzle hole.

In a preferred embodiment, the nozzle hole diameter is less than about 2 mm, preferably about 0.6 to 0.8 mm.

In another preferred embodiment, the atomizer can be automatically controlled using a flow sensor which controls a servo valve in response to the flow rate of the liquid supplied to the nozzle hole. It is preferable to provide a control unit operatively connected to the flow sensor and the servo valve. The control unit keeps the velocity of the mixture of liquid and gas supplied to the nozzle hole or the flow rate of the mixture through the nozzle hole substantially constant. If desired, the control unit can optionally adjust the mixture through the nozzle holes by the nozzle holes themselves or by automatic control.

[0010]

In the atomizer, the flow velocity of the gas is properly adjusted by the servo valve, so that the clogging of the nozzle is surely avoided.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a sprayer of the present invention has a nozzle hole 1
The nozzle 2 having 0 and at least one gas supply line 26 communicating with the inside of the nozzle hole 10. In the operating state of the nozzle 2, gas, for example, air is sucked into the nozzle hole 10 via the gas supply line 26. The gas supply line 26 is provided with a needle valve (servo valve) 28 for adjusting the flow rate of gas, for example, air.

The gas, for example air, supplied to the nozzle 2 carries away the liquid supplied to the nozzle 2 and thereby prevents the nozzle 2 from being blocked by this liquid.

In one embodiment of the present invention, nozzle hole 10
Is relatively large, its cross section is constant along its length, and virtually nothing causes the nozzle 2 to be blocked. The needle valve 28 makes it possible to control the flow rate of the liquid-gas mixture, that is, the liquid-air mixture.

In the preferred embodiment, the nozzle 2 has an annular space. The annular space 36 surrounds the nozzle hole 10, and the at least one gas supply line 26 for supplying a gas communicates with the annular space 36. From the annular space 36, at least one inclined hole, preferably a plurality of inclined holes 38 arranged on the same circumference in the direction of the end of the nozzle hole 10, are inclined and extend in communication with the inside of the nozzle hole 10. ing.

The needle valve 28 is preferably a manually adjustable needle valve so that the amount of gas supplied can be adjusted.

To automatically control the injector, pressure gauges 40, 42 are connected to the gas supply line 26 for supplying gas to the nozzle 2 and / or the liquid supply line 8 for supplying liquid to the nozzle 2. Is preferred. Pressure gauge 4
The signals from 0, 42 are fed to the control system, which automatically activates the device.

The same purpose is to use the needle valve 2 by means of the flow rate sensor 43 responsive to the flow rate of the liquid supplied to the nozzle hole 10.
It is also achieved by another embodiment of controlling eight.

In another embodiment, the liquid supply line 8 is provided with a flow rate sensor 43 upstream of the pressure gauge 40, and a signal from the flow rate sensor 43 is received between the flow rate sensor 43 and the needle valve 28. A control unit 44 is provided. The control unit 44 controls the needle valve 28 appropriately to keep the viscosity of the mixture of liquid and gas supplied to the nozzle hole 10 or the flow rate of the mixture through the nozzle hole 10 substantially constant, and / or Alternatively, the nozzle hole 10
The flow rate of the mixture passing through can be adjusted arbitrarily. Here, “substantially constant” means that the variation is 25
It means within%.

The liquid 4 is supplied from a tank (liquid source) 6 to a nozzle 2 via a liquid supply line 8. The flow rate of the nozzle 2 is preferably about 1 to 10 liters / hour, and the diameter of the droplets of liquid particles sprayed is preferably less than about 150 μm. The nozzle holes 10 of the nozzle 2 have a diameter of less than about 2 mm, preferably about 0.6-0.8 mm.

The outlet 12 of the nozzle hole 10 extends in a truncated cone shape. The outlet 12 is surrounded by a casing (sprayer box) 14 having turbulent flow generation fins 16 for generating turbulent flow. Compressed air is supplied in the direction of arrow 20 from a compressor (not shown) to the radially outer annular region 18 of the casing 14. The compressed air is discharged downstream of the outlet 12 of the nozzle 2 from a hole 22 of a cover 24 provided at one end of the casing 14, thereby exerting a suction force on the outlet 12 of the nozzle hole 10. By controlling the pressure supplied from the compressor, the flow rate of the liquid passing through the nozzle 2 can be controlled.

The gas supply line 26 is communicated with the nozzle hole 10 as described above, and in the operating state of the nozzle 2, gas, for example, air is sucked into the nozzle hole 10 via the gas supply line 26. The gas can also be heated to facilitate spraying and / or cleaning of the nozzle 2. Needle valve 2 having needle 30 in gas supply line 26
8 is arranged, and the axial position of the needle 30 can be adjusted by the rotary knob 32. Gas, eg air, is drawn into the needle valve 28 in the direction of arrow 34.

Other embodiments of the invention will be apparent to those of ordinary skill in the art in view of the specification and embodiments of the invention disclosed herein. The specification is to be considered merely exemplary, with the actual scope and spirit of the invention as indicated in the claims.

[0023]

According to the first aspect of the present invention, it is possible to provide a spraying method capable of preventing clogging of nozzles and improving the spraying work efficiency.

According to the second aspect of the present invention, it is possible to provide a sprayer capable of reliably avoiding clogging of nozzles and the like.

[Brief description of drawings]

FIG. 1 is a partial vertical sectional view of a sprayer of the present invention.

[Explanation of symbols]

 2 Nozzle 4 Liquid 6 Tank (liquid source) 8 Liquid supply line 10 Nozzle hole 12 Nozzle outlet 14 Casing 16 Turbulent flow generation fin 18 Annular area 20 Arrow (compressed air flow) 22 Hole 24 Cover 26 Gas supply line 28 Needle Valve (servo valve) 30 Needle 32 Rotating knob 34 Arrow (air flow) 36 Space 38 Tilt hole 40, 42 Pressure gauge 43 Flow sensor 44 Control unit

Claims (16)

[Claims] 1. A nozzle (2) having a nozzle hole (10).
Supplying a viscous liquid or suspension (4) to the nozzle hole (1)
0) through ;; supplying gas to the nozzle (2); flowing the gas from at least one inclined hole (38) into which the liquid or suspension (4) flows. 10), the outlet (1) of the nozzle hole (10)
2) a step of supplying the liquid or suspension (4) by the gas so as to prevent the nozzle (2) from being blocked or clogged, and the outlet (12) of the nozzle (2). ) To a); and a spraying method comprising: 2. A nozzle (2) having an outlet (12);
Nozzle holes (10) provided in the nozzle (2)
At least one gas supply line (26) communicating with the nozzle hole (10) and supplying gas to the nozzle hole (10) during spraying; and the nozzle communicating with the nozzle hole (10) A sprayer comprising: a servo valve (28) for adjusting the flow rate of the gas to the hole (10); 3. The nozzle hole (10) has a diameter of about 2 mm.
The atomizer of claim 2, which is less than. 4. The nozzle hole (10) has a diameter of about 0.6.
4. The atomizer of claim 3, which is ~ 0.8 mm. 5. The atomizer of claim 2, wherein the gas is air. 6. The flow rate of the nozzle hole (10) is about 1 to 1.
The atomizer according to claim 2, which is 0 liter / hour. 7. An annular space (36) surrounding the nozzle (2) and communicating with the at least one gas supply line (26); from the annular space (36) to the nozzle hole (10). Up to at least one sloping hole (38) extending obliquely in the direction of the outlet (12) of the nozzle (2), the sloping hole (38) being Space (3
Gas is supplied to the nozzle hole (10) from 6),
The atomizer according to claim 2. 8. A nebulizer as claimed in claim 2, wherein the servo valve is a manually adjustable needle valve (28). 9. A pressure gauge (42) disposed in at least one of said gas supply lines (26).
The atomizer according to claim 2. 10. A sprayer according to claim 2, comprising a liquid supply line (8) for supplying the liquid (4) from a liquid source (6) to the nozzle (2). 11. A nebulizer according to claim 10, comprising a pressure gauge (40) arranged in the liquid supply line (8). 12. A liquid supply line (8) for supplying the liquid (4) from a liquid source (6) to the nozzle (2); a pressure gauge (4) arranged in the liquid supply line (8).
0) and; said at least one gas supply line (26)
A nebulizer according to claim 2, having a pressure gauge (42) disposed therein. 13. The atomizer according to claim 2, further comprising a flow rate sensor (43) for controlling the servo valve (28) according to a flow rate of the liquid (4) supplied to the nozzle hole (10). 14. A control unit (44) coupled to the flow sensor (43) and the servo valve (28) for receiving a signal from the flow sensor (43), the control unit (44) comprising: Outlet (12) of the nozzle (2)
14. A nebulizer as claimed in claim 13, characterized in that the velocity of the mixture of liquid and gas supplied to the chamber or the flow rate of the mixture through the nozzle hole (10) is kept substantially constant. 15. A nebulizer according to claim 14, wherein the control unit (44) is optionally adjustable of the mixture through the nozzle hole (10). 16. A casing (14) accommodating said nozzle (2); a cover (24) disposed at one end of said casing (14) and having a hole (22); inside said casing (14) An annular region (18) defined by the casing (14) and the nozzle (2); and disposed in the casing (14) between the annular region (18) and the cover (24). A turbulent flow generation fin (16) provided; a compressed gas is supplied to the casing (14), and the annular region (18) and the turbulent flow generation fin 16
A source of compressed gas exhausted from the hole (22) of the cover (24) via the annular region located upstream of the outlet (12) of the nozzle (2). 24) and its holes (22)
The atomizer according to claim 2, characterized in that is located downstream of the outlet (12) of the nozzle (2).