CN204573233U - Airduct volume damper - Google Patents

Abstract

The utility model discloses a kind of airduct volume damper, comprise urceolus and inner core, described urceolus two ends are welded with flange, and outer tube inner wall is welded with connection bracket; Described inner core is provided with two symmetrical variable air inlets, and vertical axis is provided with slide bar, and slide bar upper end is connected with connection bracket, and slide bar is provided with Regulation spring, and the upper end of Regulation spring leans in connection bracket, and lower end abutment piston plate.The utility model solves the uppity problem of cooling air quantity existed in grate-cooler airduct air feed system, achieves the object to cooling-air automatically-controlled continuous.

Description

Airduct volume damper

Technical field

The utility model relates to the control valve of the air mass flow of cooling high temperature bulk material in grate cooler, is especially a kind ofly used in cement clinker cooler, volume damper when carrying out airduct air feed to a certain location.

Background technique

On new type nonaqueous cement production line, the clinker unloaded from rotary kiln directly falls in Coolers, and existing Coolers mostly is grate cooler, and clinker promotes grog reach by grate.Because the grog thickness material fallen from rotary kiln in grate separates, coarse fodder collateral resistance is little, and ventilate easily, air requirement is little; Fines collateral resistance is large, and draught capacity is poor, needs comparatively Wind Volume; Simultaneously in movement process, became uneven, thick local resistance is large, needs larger air quantity; Thin local windage is little, and a large amount of wind runs off in this unwanted place.When particularly carrying out airduct air feed for a certain region, blast is guaranteed, and air quantity but can not effectively be regulated because of the change of the bed of material.In order to change the air quantity variation issue that drag size brings, generally in the ventilation pipeline of grate plate bottom, volume damper is installed.

Model utility content

The purpose of this utility model is to provide a kind of airduct volume damper, realizes controlling continuously and automatically cooling air quantity in airduct air feed, and structure is simple, easy for installation.

The technical solution of the utility model is as follows:

Airduct volume damper, comprises urceolus and inner core, and described urceolus two ends are welded with flange, and outer tube inner wall is welded with connection bracket; Described inner core is provided with two symmetrical variable air inlets, and vertical axis is provided with slide bar, and slide bar upper end is connected with connection bracket, and slide bar is provided with Regulation spring, and the upper end of Regulation spring leans in connection bracket, and lower end abutment piston plate.

Further, described slide bar upper end is connected with connection bracket set screw nut, and lower end is connected by set screw nut with piston plate, is equipped with cushion pad and packing ring between set screw nut and piston plate.

Further, described inner core is connected by three groups of screw bolt and nut with connection bracket.

Further, described piston plate is welded by one block of circular steel plate and a spring seat.

Further, described connection bracket is welded by a three wings band steel and a spring seat.

Further, described variable air inlet area reduces from bottom to top step by step.

Further, the circle ring area between described urceolus and inner core is fixing intake grill.

Further, described Regulation spring is cylindroid helicalcoil compression spring, and spring is initially in micro-compressive state, and during valve work, compressive state constantly changes along with the movement of piston plate.Cooling air enters by the variable air inlet of the fixing intake grill between described urceolus and inner core and inner core sidewall the grate region needing cooling.

Further, between described piston plate periphery and inner core, there is gap, to avoid friction, also can ventilate simultaneously, be positioned at the adjustment intake grill not air intake on the downside of piston plate.

On piston plate of the present utility model, downforce P2, P1 produces pressure reduction promotion piston plate and moves, as P2>P1, piston moves down, otherwise, on move, the compressive force of Regulation spring can the displacement amount of control piston, realize automatically regulating continuously, the difference of compensatory pressure P2 and P1, piston plate move up and down the gas area of passage that can change variable ventilated port, as P2 < < P1, piston plate moves on to limit position, when variable air inlet is all blocked, fixing air port can also ventilate, now still by meeting the cooling air quantity of grog needs, the type selecting of the fixing intake grill of valve body and the hole shape of variable air inlet and size and spring is all set up according to certain knowwhy, and is verified by experiment and correct, and degree of accuracy is high, can realize automatically regulating continuously, not need other energy such as electric energy, pure mechanical adjustment, durable in use, owing to effectively can regulate the air quantity entering grate, unnecessary air quantity waste can be avoided, well can cool grog again, so energy saving simultaneously, the utility model structure is simple, easy for installation, lightweight, highly low, applied range, can be used in all kinds of airduct air feed system.

Accompanying drawing explanation

Fig. 1 is perspective view of the present utility model;

Fig. 2 is sectional drawing of the present utility model.

Embodiment

See accompanying drawing 1 and accompanying drawing 2, airduct volume damper, include urceolus 1, inner core 2, urceolus two ends are welded with flange 3, and flange mouth is total exhaust outlet.Be fixing intake grill 9 between urceolus 1 and inner core 2, so that when pressure reduction is excessive, when variable air inlet 10 is stuffy, wind also enters grate plate by valve body.Symmetrical two variable air inlets 10 on inner core sidewall, variable air inlet 10 from bottom to top opening area reduces gradually.Slide bar 5 is provided with in interior tube inner chamber, one end of slide bar 5 is connected with connection bracket 4 set screw nut 6, the other end is connected with piston plate 12 set screw nut 6, cushion pad 13, packing ring 14 is equipped with between set screw nut 6 and piston plate 12, be positioned at the adjustment intake grill not air intake on the downside of piston plate 12, slide bar is set with Regulation spring 11, one end of Regulation spring 11 leans in connection bracket 4, and the other end abuts against piston plate 12.

The hole shape of variable air inlet 10 and size on cylindrical shell, determine (during use along valve body central axis by valve body horizontal positioned) by following theory:

The gas flow path of this valve has two-way: the fixed air inflow entrance of leading up between urceolus 1 and inner core 2, if its area is, air mass flow is; The variable airflow entrance of separately leading up on inner core sidewall, if its area is, air mass flow is.Because these two air flow inlets can regard thin-wall hole as, therefore the flow equation of thin-wall hole can be adopted to calculate each inlet flow rate:

$Q_1=C_q{A}_1\sqrt{\frac{2\mathrm{\&Delta;P}}{\mathrm{\&rho;}}},Q_2=C_q{A}_2\sqrt{\frac{2\mathrm{\&Delta;P}}{\mathrm{\&rho;}}},---\left(1\right)$

Wherein: be piston plate inside and outside differential pressure, being current density, is flow coefficient, as >, and generally desirable=0.60 ~ 0.62.So, by the air-flow total amount of current stabilizer be:

$Q=Q_1+Q_2=C_q(A_1+A_2)\sqrt{\frac{2\mathrm{\&Delta;P}}{\mathrm{\&rho;}}}---\left(2\right)$

The distortion of (2) formula can be obtained:

$A_2=\frac{Q}{C_q}\sqrt{\frac{\mathrm{\&rho;}}{2\mathrm{\&Delta;P}}}-A_1---\left(3\right)$

If piston plate area is s, quality is m, and the coefficient of kinetic friction of piston plate and slide bar is, the elastic coefficient is k, and initial tension of spring is, then have according to the stress balance of piston plate:

ΔP·s＝kx+F ₀+μmg (4)

Wherein x is the distance that piston plate is moved to the left from initial position.By (3) formula and (4) Shi Ke get:

$A_2=\frac{Q}{C_q}\sqrt{\frac{\mathrm{\&rho;s}}{2(\mathrm{kx}+F_0+\mathrm{\&mu;mg})}}-A_1---\left(5\right)$

Get differential to (5) formula both sides to obtain:

${\mathrm{dA}}_2=-\frac{\mathrm{Qk}\sqrt{2\mathrm{\&rho;s}}}{{4C}_q}{(\mathrm{kx}+F_0+\mathrm{\&mu;mg})}^{-\frac{3}{2}}\mathrm{dx}---\left(6\right)$

Consider and body wall is arranged symmetrically with two variable airflow entrances, therefore when piston plate is moved to the left x, variable airflow entrance half-breadth corresponding to piston plate position is:

$F\left(x\right)=\frac{\mathrm{Qk}\sqrt{2\mathrm{\&rho;s}}}{{16C}_q}{(\mathrm{kx}+F_0+\mathrm{\&mu;mg})}^{-\frac{3}{2}}$

Accordingly, when determining design discharge, the design parameter such as the elastic coefficient k, piston plate quality m and piston plate area s of current stabilizer, the opening shape of variable airflow entrance can be determined.When pressure reduction is greatest limit, variable air inlet area is 0, can calculate the area of fixing intake grill.

During valve body work, the pressure reduction change brought along with material resistive, piston plate 12 can be automatically mobile by Regulation spring 11, realizes the object that air quantity regulates continuously automatically.

More than show and describe basic principle of the present utility model, major character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.

Claims (8)

1. airduct volume damper, comprise urceolus (1) and inner core (2), it is characterized in that: described urceolus (1) two ends are welded with flange (3), urceolus (1) inwall is welded with connection bracket (4); Described inner core (2) is provided with two symmetrical variable air inlets (10), vertical axis is provided with slide bar (5), slide bar (5) upper end is connected with connection bracket (4), slide bar (5) is provided with Regulation spring (11), the upper end of Regulation spring (11) leans in connection bracket (4), and lower end abutment piston plate (12).

2. airduct volume damper according to claim 1, it is characterized in that: described slide bar (5) upper end is connected with connection bracket (4) set screw nut (6), lower end is connected by set screw nut (6) with piston plate (12), is equipped with cushion pad (13) and packing ring (14) between set screw nut (6) and piston plate (12).

3. airduct volume damper according to claim 1, is characterized in that: described inner core (2) is connected with connection bracket (4) bolt (7) and nut (8).

4. airduct volume damper according to claim 1 and 2, is characterized in that: described piston plate (12) is welded by one block of circular steel plate and a spring seat.

5. airduct volume damper according to claim 1 and 2, is characterized in that: described connection bracket (4) is welded by a three wings band steel and a spring seat.

6. airduct volume damper according to claim 1, is characterized in that: described variable air inlet (10) area reduces from bottom to top step by step.

7. airduct volume damper according to claim 1, is characterized in that: the circle ring area between described urceolus (1) and inner core (2) is fixing intake grill (9).

8. airduct volume damper according to claim 1, is characterized in that: described Regulation spring (11) is cylindroid helicalcoil compression spring.