JPH0448502B2 - - Google Patents

Abstract

1. A hollow-cone atomizer nozzle, comprising a nozzle housing (1) in which is formed a rotationally symmetrical mixing chamber (8), a first and a second inlet bore for the liquid to be atomized and a nozzle orifice (9) at the outlet of the mixing chamber, the inlet bores being assigned valves which can be operated for the setting of the liquid part-streams, the first inlet bore (6) being arranged coaxial with the nozzle axis and the second inlet bore (3) opening eccentrically into the mixing chamber, wherein the first inlet bore opens into the mixing chamber at an angle to the nozzle axis via one or more feed bores (7).

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hollow conical atomizing nozzle in which the conical distribution range of the atomized liquid is adjustable.

The swirling of the liquid to be sprayed, which is necessary for the formation of the distribution cone in known nozzle designs, is produced by parts in the nozzle casing or by introducing the liquid eccentrically into the nozzle casing. On the other hand, the rotational moment of the liquid, which is the basis of swirling, depends on the flow velocity of the liquid.

When the flow rate changes during operation, due to the fixed geometry of the parts or the eccentric introduction and the fixed geometry of the subsequent space of the nozzle casing,
The spray angle of the nozzle also changes. On the other hand, if the flow velocity is constant, the dispersion angle can be changed simply by replacing the parts that cause the swirl.

Hollow-conical atomizing nozzles are used, for example, for atomizing dye suspensions in spray dryers during the production of dyes. The predetermined spray angle of the sprayed suspension must then be kept constant within a small range. If the angle is too small, the heat capacity of the drying air will not be utilized optimally, reducing the efficiency of the device and resulting in incompletely dried product particles. If the spreading angle is too large, the product will seize on the walls of the dryer, which must be avoided for safety and quality reasons. Therefore, the drying process is repeatedly interrupted.

When drying highly dispersed textile dye preparations, it is necessary to re-determine the drying conditions in the individual stages, such as the inlet and outlet temperatures of the drying air. On the one hand, maintaining optimal product flow;
On the other hand, it is intended to prevent quality deterioration due to, for example, too high heat loads during drying. To do this, it is necessary to have a variable flow rate to the nozzle.

In some cases, when operating parameters affecting the spreading angle change, such as changes in the flow rate and therefore the flow velocity in the nozzle when starting the drying process, changes in the viscosity and/or solids content of the liquid, The drying process must be interrupted many times to replace nozzle parts and optimize the spray angle.

It is therefore an object of the present invention to develop a hollow conical atomizing nozzle that allows adjustment of the dispersion angle during the atomizing operation without replacing parts or changing the nozzle chamber with eccentric inlet holes.

This problem is solved by a hollow conical atomizing nozzle as follows. i.e. a nozzle casing in which a rotationally symmetrical mixing chamber is formed, and at least two nozzle casings for supplying the liquid to be atomized to the mixing chamber.
two inlet holes and a nozzle opening at the end of the mixing chamber, the inlet holes having a regulating valve for regulating the flow of the liquid to be atomized, and at least one of the inlet holes
A device is arranged for generating a swirl of the incoming liquid after the nozzle to form a dispersion angle of the nozzle, and the at least one inlet hole further mixes through one or more feed holes at an angle to the nozzle axis. It opens into the room.

According to an advantageous embodiment, the device for producing a swirl comprises:
It is formed by an inlet hole opening eccentrically into the mixing chamber.

A pivoting component may be placed after one of the inlet holes.

In another configuration of the hollow conical atomizing nozzle, the at least one inlet hole opens into the mixing chamber parallel or coaxially to the nozzle axis. The inlet hole can then open into the mixing chamber at an angle to the nozzle axis.

According to another embodiment of the hollow conical atomizing nozzle:
The at least one inlet hole opens into the mixing chamber substantially radially relative to the nozzle axis.

According to another embodiment of the hollow conical atomizing nozzle:
The two inlet holes open into the mixing chamber eccentrically and oppositely to each other in the direction of the flow of the liquid to be introduced through the inlet holes.

Embodiments of the present invention will be described below with reference to the drawings.

The basic structure of the present hollow conical atomizing nozzle, hereinafter referred to as nozzle, is based on the method in which the liquid to be atomized is introduced into the nozzle casing in two or more partial streams, so that at least one partial stream is A swirl is provided which forms the distribution angle, and the other partial streams are fed in without swirl. The partial streams are superimposed in the mixing chamber of the nozzle, so that for the entire liquid stream exiting the nozzle opening, a swirl occurs which has a combined rotational moment corresponding to the size of the partial streams and which determines the distribution cone angle. . By means of an operable valve, the partial flow supplied to the nozzle and thus the spray angle can be adjusted.

According to the embodiment shown in FIGS. 1 and 2, the nozzle casing 1 is arranged coaxially with respect to the nozzle axis 5 in the inlet hole 3 opening eccentrically into the swirling chamber 2 and in the insert 4. The inlet hole 6 opens into the swirl chamber through one or more feed holes 7 at an angle of, for example, 45 DEG to the nozzle axis. The swirling chamber is adjoined by a rotationally symmetrical mixing chamber 8 in which the partial streams introduced via the inlet holes 3 and 6 are mixed, so that the rotational moment of the eccentrically introduced partial streams is distributed throughout the liquid stream. The outlet of the mixing chamber opens into a nozzle opening 9.

Instead of an eccentrically arranged inlet hole, it is also possible to provide a hole which connects a swirling part, such as a swirling chamber plate or a swirling passage, and which opens into the swirling chamber radially or parallel to the nozzle axis. Similarly, instead of the inlet hole 6, it is also possible to provide a hole parallel to the nozzle axis 5 (FIG. 5) or radially open in the mixing chamber 8 (FIG. 3).

The feeds (not shown) for the inlet holes 3 and 6 communicate via fine-adjustment valves, so that the distribution angle of the partial flow fed into the holes and thus of the total liquid flow leaving the nozzle opening 9 can be adjusted. Yes, there is no need to change the nozzle or replace any parts. Furthermore, this allows automatic adjustment of the spreading angle.

According to another embodiment of the nozzle according to the invention, as shown schematically in FIG. It opens into the swirling chamber and the subsequent mixing chamber. Instead of an eccentric arrangement, it is also possible to provide a pivoting part for the inlet hole.

The nozzle according to the invention makes it possible to readjust the spray angle when the total flow rate through the nozzle is variable, when the viscosity of the liquid to be sprayed changes, or when the solids content of the liquid changes. . Conversely, when the flow rate is constant, the spray angle can be varied over a wide range.

[Brief explanation of drawings]

1 is a longitudinal cross-sectional view of a hollow conical atomizing nozzle with an eccentrically arranged inlet hole and a coaxially arranged inlet hole; FIG. 2 is a cross-sectional view of the nozzle along line - in FIG. 1; , 3, 4 and 5 are schematic diagrams showing various arrangements of inlet holes leading into the interior of the nozzle casing, respectively. 1... Nozzle casing, 2... Turning chamber, 3, 6...
Inlet hole, 8...mixing chamber, 9...nozzle opening.

Claims (1)

Claims: 1. A nozzle casing with a rotationally symmetrical mixing chamber 8 formed therein, and at least two inlet holes 36 for supplying the liquid to be sprayed into the mixing chamber and a nozzle opening at the end of the mixing chamber 8. 9 is provided, the inlet hole having a regulating valve for regulating the flow of the liquid to be sprayed and generating a swirl of the introduced liquid forming the spray angle of the nozzle after at least one of the inlet holes 3, 6. A hollow cone in which the device is arranged and further characterized in that at least one inlet hole 6 opens into a mixing chamber 8 via one or more feed holes 7 at an angle to the nozzle axis. spray nozzle. 2. The device for generating swirl is formed by an eccentrically opened inlet hole 3 in the mixing chamber 8;
A nozzle according to claim 1. 3. The nozzle according to claim 1, wherein the swirl-generating device is a swirl-generating component disposed after the inlet hole. 4 At least one inlet hole 6 is connected to the nozzle axis 5
2. The nozzle according to claim 1, wherein the nozzle is arranged parallel to or coaxially with the nozzle. 5 At least one inlet hole 6 is located along the nozzle axis 5
The nozzle according to claim 1, wherein the nozzle is arranged at a predetermined angle with respect to the nozzle. 6 at least one inlet hole opens into the mixing chamber 8 substantially radially relative to the nozzle axis 5;
A nozzle according to claim 1. 7. The two inlet holes open into the mixing chamber 8 eccentrically and oppositely to each other in the direction of the flow of the liquid to be introduced through the inlet holes.
Nozzle as described in section.