CN201352318Y

CN201352318Y - Automatic flow regulator

Info

Publication number: CN201352318Y
Application number: CNU2008201766037U
Authority: CN
Inventors: 敬清海
Original assignee: Chengdu Design & Research Institute Of Building Materials Industry Co Ltd
Current assignee: Chengdu Design & Research Institute Of Building Materials Industry Co Ltd
Priority date: 2008-11-07
Filing date: 2008-11-07
Publication date: 2009-11-25
Anticipated expiration: 2018-11-07

Abstract

An automatic flow regulator can make negative feedback according to a pressure difference generated by fluid passing through the inside and outside of a shell in order to automatically regulate the flow of the fluid, the manufacturing of the automatic flow regulator is simple, and the application range is broad. The automatic flow regulator mainly comprises a shell (1), a valve core (2) capable of moving axially, a feedback spring (3), a pretightening force regulation unit (4) and a seal ring (5). When the fluid (0) passes through the valve core (2), a pressure difference is generated between the inside and outside of the shell (1), the acting force generated by the pressure difference on the bottom of the valve core (2) and the opposite acting force generated by the displacement of the feedback spring (3) from the valve core (2) balance each other, the valve core (2) has different effective opening areas at different positions, so that the regulation unit can instantly make reverse compensation when the resistance of the fluid is changed along with the downstream resistance, and thereby the flow of the fluid can unsusceptibly keep constant or can be changed in accordance with a set regularity when the downstream resistance is changed.

Description

Flow automatic regulator

Affiliated technical field

The utility model relates to a kind of flow automatic regulator that the fluid flow that passes through is automatically adjusted according to the variation of downstream resistance.Can be widely used in industries such as building materials, chemical industry, metallurgy, for example be used for manufacture of cement and regulate the flow of comb formula chamotte cooler cooling air to reduce wind loss assurance cooling effect.

Background technology

Fluid mobile followed such rule: the local flow that resistance is little is big, and the local flow that resistance is big is then little, and this all is suitable for for gas or liquid.Yet, be not wish that flow is subjected to such influence in some occasion.For example, grate cooler utilizes cooling air that the grog particle is cooled off in the manufacture of cement, and the granularity of grog and thickness distribution all can not be very even, and is also just different for the resistance of cooling air accordingly.For example have higher air flow resistance in the higher zone of thickness of feed layer, it is less to cause flowing through this regional cooling air delivery, and a large amount of grogs is piled up and but be can not get good cooling; On the contrary, have lower air resistance in the lower zone of thickness of feed layer, cooling air passes through from this zone in large quantities, and a spot of in fact here grog only needs less air to cool off, and has wasted the energy that cooling air quantity and blower fan consume.

At such problem, existing cooling machine has adopted " high-drag " grate plate technology.This technology will be used for support grog and cooling but the grate plate passed through of air make and have very low aperture opening ratio, thereby make it have very high air flow resistance.Cooling air needs successively by grate plate and grog layer, is determined by the drag overall that the resistance of the resistance of grate plate and grog layer is added up so its flow is actual.Because the resistance of the resistance ratios grog layer of such " high-drag " grate plate is much bigger, the variation of bed of material resistance is just less relatively for the influence of drag overall, and is corresponding also just less to the influence of air mass flow.This technology plays an important role to improving cooling effect, has reduced the influence of the variation of bed of material resistance for air mass flow to a certain extent, but can not eliminate this influence fully.On the other hand, " high-drag " grate plate has artificially increased a resistance very high and basic fixed is constant on the basis of grog layer resistance, improved the requirement to the air feed blower pressure, causes fan energy consumption to increase.For making grate plate have high resistance, very little (1～2mm), manufacturing accuracy requires high, has caused higher manufacturing expense in the slit between grate plate.

Another technology is also widely applied in existing cooling machine, by some air compartments the bed of combing is subdivided into less zone, carries out the control of air feed pressure and flow respectively, improves the adaptability of air-distribution for bed of material fluctuation with this.But also cause the device structure complexity thus, electrical control requires high, so air compartment also can not get very carefully, and general air compartment quantity is no more than 10, in the not little area of single air compartment, the unevenness that grog distributes still exists for the harmful effect of air-distribution.

A kind of known flow regulator, utilization changes gas flow area around the valve plate of horizontal rotating shaft swing under the acting in conjunction of gravity and air velocity, the resistance of flow regulator itself is changed, with the caused change in resistance of compensation grog undulated layer, reach the effect of stablizing cooling air delivery.There is following shortcoming in this regulator: the housing cross section is a rectangle, in edge sealing difficulty; The variation of its aperture area is firm and hard existing by the tongue with holes of an embowment, and the tongue plate only is connected with valve plate on one side, is cantilever design, and processing and turning round all is difficult to the shape that keeps correct; Because it is regulated action and depends on the torque that the suffered gravity of valve plate forms in rotating shaft place, when the bed that is applied to comb is not fixing but makes the driving cooler of horizontal reciprocating movement, the adjusting result that regulator leads to errors being subjected to the interference of inertial force and vibration when reciprocating.

Summary of the invention

The purpose of this utility model is that what a kind of pure physical construction was provided can carry out the flow regulator that self-adaptation is regulated continuously, has reliable sealing, can realize regulatory function under reciprocating application scenario reliably, can make simply simultaneously.

Flow automatic regulator provided by the utility model, mainly comprise fixed housing 1, axially displaceable spool 2, control spool 2 positions feedback spring 3, pretightning force regulating device 4, spool 2 is sealed and the sealing ring 5 of motion guide, see accompanying drawing 1.Fluid 0 enters housing 1 inner and and then supply downstream load by some apertures or other shaped aperture on spool 2 sidewalls.Under the certain situation of supply source pressure, fluid pass through flow by flow velocity and the common decision of aperture area, and flow velocity is relevant with pressure reduction (being the regulator resistance) inside and outside the housing.Under the effect of sealing ring 5, the opening 2.1 on the spool 2 only part beyond housing could supply fluid to pass through, and this part aperture area is the effective vent area.When the downstream load resistance reduces, cause that flow velocity rises, to the pressure reduction inside and outside the governor body be increased, the acting force that differential pressure action forms in spool 2 bottom surfaces increases, promoting spool 2 moves to enclosure interior, force spring 3 to produce the opposition that acts on spool 2 behind the length displacements increases thereupon, after the acting force that forms in spool 2 bottom surfaces with differential pressure action reaches balance, spool 2 stops on the new position, the effective vent area that for fluid pass through on spool 2 sidewalls this moment reduces, offset the influence that flow velocity rises, made the flow that passes through of fluid still remain on these a series of variations level before, reached the effect of Control Flow.Otherwise then opposite, when the downstream load resistance increases, spool 2 will move to outside, and the effective vent area increases, and the influence of having offset the flow velocity reduction remains in the range of control flow.

In addition, have the bypass opening 1.1 of some and area on the housing 1, no matter what position spool 2 is in, and fluid can pass through from this all the time so that when spool 2 enter housing 1 fully and when effective vent area is zero on it fluid still keep certain flow.

Keep except making flow not be subjected to the influence of downstream load resistance fluctuation stable, if desired, flow is proportionate or the variation of negative correlation with the variation of downstream load resistance, promptly flow is can be with the increase of downstream load resistance cumulative or decrescence.This can realize by the rigidity of change spring 3 or opening shape or the distribution situation on the spool 2, make regulator have different flows-drag characteristic curve.By pretightning force regulating device 4 position adjustments in the axial direction, can eliminate the spring assemblage gap and change the displacement initiation point of spool 2, just regulate the active section starting point on flow-drag characteristic curve.

The beneficial effects of the utility model are: the resistance of its convection cell can be made corresponding compensation according to the variation of downstream load resistance, regulates flow by fluid and changes by designing requirement or keep stable; Adjustment process need not automatically controlled, and fully the mechanical property of use device own realizes, and this compensatory adjusting is continuous, instant, adaptive, the step phenomenon that does not have classification to regulate; Valve body and spool are round section and are easy to realize reliable sealing, spool 2 relies on cooperating between its outer wall and housing 1 and the sealing ring 5 to carry out motion guide and spacing fully, thereby need not axle, guide rail or other special supporting devices, simple in structure, be convenient to make; Because spool is the pressure reduction sensing element also is the control element of fluid flow area, can obtain different rating curves by changing different spools simply, and need not other parts are changed, in the replacing process in addition housing also need not from the installation site to disassemble; Adjustment process is based on the mutual balance of the acting force that acting force and camber of spring produced that fluid pressure difference produced, gravity and inertial force all can not cause harmful effect to its regulatory function, therefore regulator is not only applicable to actionless application scenario, and being installed at needs also can reliably working under the application scenario on the to-and-fro movement member.Because simple in structure, the size of whole regulator can be unrestricted, both can maximize, and also can do very for a short time, is very suitable for that bigger perform region is subdivided into some very little regulons and carries out the accurate adjusting of flow respectively.

Description of drawings

Accompanying drawing 1 is a sectional structure synoptic diagram of the present utility model.

Accompanying drawing 2 is plan structure synoptic diagram of the present utility model.

Accompanying drawing 3 is skeleton views (cut away housing 1 1/4th so that observe) of the utility model embodiment.

Accompanying drawing 4 is pretightning force regulating device cut-open views of the utility model embodiment.

Embodiment

Accompanying drawing 3 is one of embodiment of this utility model.In this embodiment, below many grate plates that are installed in grate cooler according to flow automatic regulator of the present utility model, the cement clinker of grate plate top is cooled off in order to cooling air to be provided.A flow automatic regulator all is installed below each piece grate plate, is made the adjusting of cooling air delivery can be as accurate as the such junior unit of each piece grate plate like this.Regulator directly is connected with grate plate by the bolt hole 1.2 on housing 1 top flange, and cooling air enters housing 1 through the opening 2.1 of spool 2 sidewalls, and then rises and pass grate plate and enter the grog layer.Housing 1 has the bypass opening 1.1 of some and area near the position on top, enters housing 1 fully and when regulator cuts out fully, still can keep certain cooling air delivery when spool 2 like this.Flow spool 2 adopts the made of smooth surface and light weight to guarantee the flexible of motion, and for eliminating the influence that possible dust accretions brings, its bottom surface can be provided with certain opening or make the dip plane.Feedback spring 3 is a cylindroid helical-coil compression spring, can certainly adopt conical helical spring or other forms of spring to obtain different stiffness characteristics.Sealing ring 5 is installed in housing 1 bottom surface by pressure ring 6 and bolt 7, adopts low-friction coefficient materials such as teflon, and and to keeping very little gap between the spool 2, it can be free to slide and avoid taking place crooked.

Pretightning force regulating device 4 is fixed by the radial gusset in housing 1 top, and its structure is seen accompanying drawing 4.Its annular outer ring 4.1 inwalls have internal thread, and inner ring 4.2 cooperates with it by the external thread of outer wall.The convex shoulder of inner ring 4.2 lower ends is used for the end of support spring 3, when inner ring 4.2 is done clockwise or is rotated counterclockwise, inner ring just can be done moving downward or upward vertically under the effect of screw thread, thereby changes the pre compressed magnitude to spring 3, realizes the adjusting to its pretightning force.Inner ring 4.2 middle parts have translot 4.2.1 one, after being adjusted to spring 3 and having suitable pretightning force, make translot form mutual extruding force up and down between two parts by tightening screw 4.3, can realize the locking of inner ring 4.2 locking easily.

When the grog of the grog layered material on grate plate thickening or top is thin, the grog layer resistance increases, the air velocity that flows in the valve body reduces, the external and internal pressure difference reduces, spool 2 moves down under the effect of spring, the effective vent area that the cooling air that makes passes through increases, thereby keeps the stable of cooling air delivery.Otherwise it is then opposite.Regardless of increasing at bed of material resistance or reducing, make corresponding adjusting by moving automatically of spool 2, the cooling air volume that grog can obtain suiting, therefore, cooling effectiveness and air utilization ratio have all obtained improving greatly.

Claims

1. flow automatic regulator, form by fixing housing and the control element that under the fluid effect, moves and annex, it is characterized in that: in governor body (1), have and to respond to housing external and internal pressure difference and mobile vertically spool (2) with control fluid flow area.

2. flow automatic regulator according to claim 1 is characterized in that: spool (2) is the circle tube member of band bottom surface, and sidewall has the aperture (2.1) or other shaped aperture that distribute according to certain rules and flows into housing (1) inside for fluid.

3. flow automatic regulator according to claim 1 is characterized in that: have characteristic between spool (2) and the housing (1) and be linear or nonlinear feedback spring (3).

4. flow automatic regulator according to claim 1 is characterized in that: feedback spring (3) has pretightning force regulating device (4).

5. flow automatic regulator according to claim 1 is characterized in that: have sealing ring (5) between housing (1) and the spool (2).

6. flow automatic regulator according to claim 1 is characterized in that: spool (2) relies on cooperating between its outer wall and housing (1) and the sealing ring (5) to carry out motion guide and spacing fully.

7. flow automatic regulator according to claim 1 is characterized in that: the bypass opening (1.1) that has some and area on the housing (1).