Separating element of two-line angular air cleaning screen

FIELD: process engineering.

SUBSTANCE: invention relates to machine building. Labyrinth-type separating element features the shape of angle-deflector. Angle-deflector inner angular part represents channel-collector open towards working airflow. Angle-collector is divided by vertical plate into two identical parts and features variable depth increasing in coordinates of angular screen mounted in operating position in direction from top to bottom.

EFFECT: higher operating efficiency.

2 cl, 4 dwg

 

The invention relates to the field of non-contact devices air cleaning, ventilation or cooling systems and for the design of separating elements double row angular grids labyrinth type so-called "two " V" (2V) type.

Field of application - system input air purification on the main locomotives.

The use of angular grids labyrinth type (in particular, in a variant 2V) input air purification, for example, on the main locomotives known. They consist of two rows of parallel spaced vertical separating elements, in the shape of the corners of the reflector. The latter are mounted in a common frame counter input parts these parts of the reflector with a gap sufficient for the passage of cleaned air.

Such a system input angular lattice, which contains the separating element is the prototype, applied on the locomotive N (see Voronkov FF ON the aerodynamic coefficients of resistance of the ventilation louvers locomotive. Sat. the scientific. works "electrovozostroenie", vol. 1. Novocherkassk, 1961. P. No.201-207. Fig.4 on str). It proved to be very effective. It is established extensive experimental studies in comparison with the input blinds electric locomotives type. Empirically were defined functions

ζ=is(W O;WB),

where ζ is the local coefficient of aerodynamic resistance blinds;

WO- the speed of the locomotive, km/h;

WB- average air velocity at the entrance to the blinds, m/S.

In particular, it was found that the specified function in the input arrays locomotive n (their design, see ibid., 3) and N almost the same (Fig.5 and 6). It is obvious, however, that the filtering ability of the lattice N disproportionately higher.

Additional comparative studies characteristics 2V-lattices locomotive N (Voronkov FF, Pescovitz B.C. Palisadian air-intake devices of electric locomotives. Sat. the scientific. works "electrovozostroenie", Vol.2. Novocherkassk, 1962. P. 219-228) showed consistently high quality. This gave reason to recommend the use of these input grids on all locomotives (see ibid., str).

Another fact. Coordinated the selection of design parameters and operating modes 2V-lattices designers managed to achieve such a high efficiency of their work, for example, that the German electric locomotive series To the adopted system of air treatment in which air after passing through the intake grille was applied directly to the body (long-haul locomotives: General characteristics. The mechanical part. M., engineering, 1991. P. 162 to 165).

The placenta is provide more detailed aerodynamic analysis of separation processes in 2V-lattices have been identified opportunities to further improve ongoing processes. This is shown by the following two fragments of this analysis, which simultaneously define and disadvantages of the prototype object of the present invention.

A. the Corners of the reflectors of known designs made of plastic sheet material (e.g. metal) bend in the stamp on the prism with a small bend radius, which allows to obtain an acute included angle. Thanks to this in-depth profile of the corner reflector is formed shadow, which sharply from turning in a horizontal plane flow of air by centrifugal forces discarded airborne particles. Staying within the zone of wind shadow, they are under the influence of gravity down along the trench corner-reflector in the lower divisions where removed in water-snow-dust bag or brought outside.

As a result, effective depth of the wind shadow there reduced and ash through her suspended particle horizontal flow of the blown air increases. When a large quantity of air, intense rain or snow shadow here may even disappear, and angular lattice filter system in the lower part almost ceases to perform its function, which is a significant shortcoming of separating elements of the prototype from the local corner cube arrays.

B. a Second shortcoming of separating elements of the prototype, made in the form of corner-reflector simplest form, relates to the scheme of aerodynamics. It is that subject separator cleaning current of air is divided into two in the horizontal plane directly at the approach to the area of the wind shadow of the corner-reflector or, similarly, connects two General education of the output stream. In both cases, in the areas of separation or connection threads, there is a considerable turbulization. This reduces the total separation effect separation of suspended particles of air in a wind shadow area when using angular lattice separating the known elements of the specified type.

The objective of the invention is provision of equal height double row angular lattice intensity separation of suspended particles purified air in the separating elements - corner-reflectors with more General intensification of the separation process and thereby increase the efficiency of the lattice as a whole.

The problem is solved according to this proposal, the change in comparison with the known shape of the horizontal cross-section separating element double row angular lattice labyrinth type device proximity clean ventiljacionnyjj cooling systems. The essence of this change is that the separating element having the form of a corner-reflector made with its inner corner part in open towards the working air flow channel of the manifold. When a sufficient section of the specified channel eliminates the possibility of local loss of aerodynamic shadow of the separating element as a result of filling the separated material and thereby reduce the intensity of separation. And this valuable positive effect is achieved regardless of the changing height of the lattice power vertical exhaust flow separation material.

In addition, the channel-collector can be used for installation in a thin vertical plate which divides the channel into two equal portions. When the plate width is not less than the distance from the bottom of the channel-collector to the edges of the counter installed in the frame corners of the reflector is eliminated turbulization of the active zone of separation of suspended particles from the passing air. This increases the degree of its purification.

When the consistency of the overall geometry of the profile area of the reflector and, accordingly, the area of aerodynamic shadow of the specific (per unit vertical size) number of separated material can be considered idem - permanent. Therefore, the capacity of the above flow can be considered as the practice is Cesky linearly dependent on the height of a horizontal elementary stream of air, passing through the separating element. This allows the channel-collector with linearly varying variable depth, increasing in coordinates installed in working position angle of the grating along the direction from top to bottom.

This constructive measure achieves a more rational use of the material of the active part of the lattice (e.g. the parts of the reflector), which is an additional advantage of the proposed device in comparison with the prototype.

Separating elements in lattices of this type is always direct. Their length L (see below, figure 4) is usually close to 1 M. they are Made, as mentioned earlier, from a sheet material bending punching in the prisms. Therefore, the proposed change of the profile of separating elements having the form of a corner-reflector, no technological difficulties in production does not cause.

In figure 1 for comparison with the proposed shows a sectional fragment of the aerodynamic configuration of the double-row angular lattice labyrinth type with corner-reflectors-known form:

And1And2zone wind shadow of the input and output parts of the reflector;

In1(In2) - corresponding to this model the core of the input (output) of the zone of separation (conditionally);

arrows indicate:

V1- input p of the air flow;

V'1, V"1- its components after separation in the input area of the reflector;

V2- the output stream;

figure 2 shows this model scheme, similar to the circuit of figure 1, but with the corner reflector of the proposed profile; here a is the depth of the channel-collector;

figure 3 shows in horizontal section the proposed scheme (as an example - input) of the area of the reflector of figure 2, provided with a fixed channel-collector separation plate:

AP1, AP2zone wind shadow;

arrows indicate:

VP1VP2components separated input stream of inlet air into a corner-reflector with an optional enhancement;

V'P1, V"P2- this is the same output;

arrow R shows the direction of force of pressing of the electrodes (rollers) of the welding apparatus when forming the welded prefabricated profile this option, corner-reflector;

figure 4 shows the geometric pattern (transverse vertical section of the lattice), which determines the pattern of change in the depth of a channel-collector (see figure 2) depending on the vertical coordinates of the l - distance cross-section-area-reflector from the upper end of its fixing in the frame of the lattice; the arrow S indicates the direction of the gravitational motion in Caen is lah-manifolds separated material in them.

Proposed separating element 1 double row angular intake grilles labyrinth type has, as in the prototype (see figure 1), the General shape of the corner reflector. However, it contains the most important new distinctive design features: the inner part of the corner reflector is designed as an open in the direction of the working air flow channel-collector 2 (figure 2). While the corners of the reflectors, a counter installed in the frame of the lattice are the same, ie contains the channel-collector 2, the profile, and their free edges 3 can maintain the original position relative to the profile 1.

The presence of a separating element 1 channel-collector 2 allows you to make the construction of the additional improvements, fixes the second disadvantage of the prototype. The specified channel-collector 2 has fixed therein a vertical thin plate 4 (see figure 3), dividing it lengthwise into two equal portions. The width of the plate should be selected not less than the amount b from the bottom of the channel-collector 2 to the edges 3 a counter installed in the frame of the lattice corners of the reflector.

Constructive-technological alternative mounting of the separation plate 4 within the channel-collector 2 separating element opredelaetsa material used for manufacturing the main profile, and technological capabilities of the production. In particular, figure 3 shows a structurally most efficient when the plastic material option of fixing the separation plate 4 in the additional recess 5 of the bottom of the channel-collector 2 with the compression on the press and the subsequent final mounting contact welding point or roller electrode, and rivets. The high plasticity of the material in the separation plate 4 is not required.

A near-linear distribution pattern on the height of L (see figure 4) cumulative effect of filling the channel-collector 2-products separation allows you to create a design proposed separating element 1 with the most efficient use of material. This is achieved practically without changes previously adopted technology implementation of the channel-collector 2, but with its variable depth a (see figure 2), increasing in the coordinates installed in working position angle of the grating along the direction from top to bottom, i.e. in function of the coordinates l.

The work proposed separating element 1 is determined by the known General characteristics of aerodynamic separation process as in item double row angular air pollution control lattice labyrinth type, but differences of this process, due to the differences in the new design from the prototype.

As in the prototype is (see scheme 1), the main components of the total aerodynamic scheme proposed separating elements 1 are the areas of wind shadow And1and zones of separation In1. In the zone of separation In1the separation of the input air flow V1on the side V'1and V2and, as a result, abrupt changes in the horizontal plane direction of air movement in these Polubotko there is a selection of these centrifugal forces of suspended particles in the outer side of the curvature of the trajectory of their movement. So they get into wind shadow And1, the outer boundary of which is determined by the practical absence of air flow of the main flow, with subsequent gravitational removing suspended solids from it (see above criticism first disadvantage of the prototype).

The fundamental difference between the nature of the work proposed separating element 1 when compared to the prototype is that for zone wind shadow And1created extra baggage in the form of a channel-collector 2. It eliminates the possibility of loss of effective area of this zone as a result of its overflow weighted products of separation, creating the entire height of the lattice passage for their unhindered removal of vertical movement under the action of gravity.

When installed in the channel-collect the e 2 thin vertical plate 4, dividing the specified channel into two equal portions, with the width of the plate 4 is not less than the distance b from the bottom of the channel-collector 2 to the edges of the corners of the reflector 3, a counter installed in the grille air intake device (figure 3), the total aerodynamic scheme of work separating element 1, with the preservation of the main drainage features of the channel-collector 2 is abruptly changed. Namely:

a) to approach to the field of separation occurs the separation of the total input air flow to the components of VP1and VP2that leads to the extinction of the zone of turbulence B1and related losses (see above criticism second disadvantage of the prototype);

b) in the channel-collector 2 are formed two independent zones aerodynamic shadow of AP1and AP2working on specified above in paragraph (b) reason more effectively (according to the total selection of products separation)than zone a1in the scheme of figure 2.

This feature of the separating element 1 according to scheme 3, despite some structural and technological complexity in comparison with the circuit of figure 2, may be an advantage in determining the feasibility of preemptive practical application of this option.

Of diagrams figure 1 and figure 2 we can see that the aerodynamic processes in the zones And2and In2corner-reflectors, counter installed the frame of the lattice, almost do not differ from similar processes in zones A1and B1. Therefore, the work proposed separating element 1 of the second row of the grid is not separately considered.

The improvement proposed separating element 1 so that the channel-collector 2 made with variable depth, increasing in coordinates installed in working position angle of the grating along the direction from top to bottom (figure 4), does not change the nature of the work of separating elements 1 as a corner-reflector including its air pollution control grid. The purpose of this improvement is not a change in the entity or process parameters in the system, but, while maintaining stability, to improve the utilization of the structure material separating element 1. This provides an additional degree of common design and technological excellence of the system.

1. Separating element double row angular air pollution control grid fin type, having the form of a corner-reflector, characterized in that the inner corner portion of the corner reflector is designed as an open in the direction of the working air flow channel of the manifold, separated by a vertical plate into two equal parts and performed with variable depth, increasing in coordinates installed rabochee the angular position of the grating in the direction from top to bottom.

2. Separating element according to claim 1, characterized in that the vertical plate that divides the reservoir into two parts, has a width of not less than the distance from the bottom of the channel-collector to edges, counter installed in the frame corners of the reflector.



 

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