CA1067478A - Control arrangement for a damper - Google Patents
Control arrangement for a damperInfo
- Publication number
- CA1067478A CA1067478A CA279,095A CA279095A CA1067478A CA 1067478 A CA1067478 A CA 1067478A CA 279095 A CA279095 A CA 279095A CA 1067478 A CA1067478 A CA 1067478A
- Authority
- CA
- Canada
- Prior art keywords
- damper blade
- damper
- actuating means
- energized
- orifice
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
Abstract
ABSTRACT OF THE DISCLOSURE
A damper control arrangement wherein a damper blade opens and closes a flow-through orifice in response to selective moving means, the selective moving means moving the damper blade a preselected distance from the orifice opening to vary the opening of the orifice for a predetermined period of time prior to moving the damper blade to a fully open position.
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A damper control arrangement wherein a damper blade opens and closes a flow-through orifice in response to selective moving means, the selective moving means moving the damper blade a preselected distance from the orifice opening to vary the opening of the orifice for a predetermined period of time prior to moving the damper blade to a fully open position.
.
Description
1~6747~ ~
This invention relates to a damper control arrangement and in particular relates to a damper control arrangement includ-ing means to selectively control the opening area o~ a flow-through orifice. Even more particularly, this invention relates to a damper con-trol arrangement which provides a selectively buffered transition in a system when starting or stopping the ~low of fluid in the system.
In many applications it is desirable to provide for a buffered transition when removing a fluid system from or returning a fluid system to different preselected fluid flow conditions.
For example, in the filtering of a gas stream using cloth fabric bags, it is desirable to avoid a sudden surge of gas when a gas controlling damper arrangement is activated, the sudden surges of gas causing the fabric filter bags to snap and consequently weaken the fabric material. This weakening of the fabric is intensified when the fabric material is one containing glass fibers.
Prior art damper arrangements, such as bullseye dampers and butterfly dampers, can only be made to function satisfactorily by using an expensive time actuating means which causes them to operate in a relatively slow manner. Even so, butterfly dampers are particularly difficult to use becuase the fluid flow rate does not change linearly wlth respect to the change in position of the damper blade as most of the fluid is controllable when ~he damper blade moves to a position substan-tially parallel to the direction of flow of the fluid. Less objectionable is the bullseye damper since its ~low rate changes linearly over the entire damper blade stroke.
In order to provide a control arrangement for a damper to selectively control the opening and closing of a flow-through orifice to provide a selectively buffered transition in a system when starting or stopping the flow of fluid therethrough, U.S.
-- 1 -- ~
``` ~067~78 3,8981997 has been proposed utilizing electrical actuating means to actuate the damper means for movement of the damper blade from one position to another. In this reference, when the damper ~lade is in an open positionl a soIenoid is required to be energized. Furthermorel when the device taught by the reference is used in combination with a filter system utiLizing a baghouse and the damper assembly is disposed in an inlet~air system to the baghousel when a compartment is being cleaned the damper is closed and one solenoid is de-energized, but a second solenoid is requlred to be energized. When putting the system back on stream and a soft-inflate is required, the one solenoid is energized and the second solenoid is de-energized until a pre-selected distance or preselected period of time has been satisfied.
Then, the energized solenoid is de-energized. After the cycle is ready to end the low flow rate, the de-energized solenoid is then re-energized to open the damper and remains in the energized position during the normal operation of the system.
In the present invention, it is recognized that it is desirable to provide a damper control arrangement for selectively controlling the opening and closing of a flow-through orifice and it is further recognized that it is desirable to provide a damper control arrangement which is straightforward, inexpensive, readily constructed and easily maintained.
The present invention advantageously provides a straight-forward arrangement for a damper control arrangement which includes means to control the opening and closing of flow-through an orifice.
The present invention further provides a damper contro] arrange-ment which is inexpensive, sturdy, easy and quickly operable and yet effective during operating conditions. The present invention even further provides a damper control arrangement which is use-ful where, for example, the gentle inflation of a gas filter bag, as it is being put onstream, utilizes solenoid valves to maintain 1067~78 the damper in its fully closed position when said solenoids are energized and a fully open or normal operating condition when both solenoids are de-energized and at intermediate holding positions of the damper assembly, one solenoid is energized and another solenoid is de-energi2ed.
Various other features of the present invention will become obvious to those skilled in the art upon reading the disclosure set forth hereinafter.
More particularly, the present invention provides a damper control arrangement comprising: a housing wall having an orifice therein, a damper blade movably positioned selectively between at least one open position and a closed position in relation to the orifice, damper blade moving means in communica-tion with the damper blade for moving the damper blade relative to the housing wall, actuating means operable to actuate the damper blade moving means for movement of the damper blade from one position to another, the actuating means including control means for the damper blade moving means actuated in response to a first control circuit and a second control circuit wherein the first control circuit includes means for de-energizing the actuating means to a position to cause the selective opening of the orifice by moving the damper blade a preselected distance, means for energizing the actuating means once the damper blade has traveled a preselected distance, and a timing device arranged to maintain the damper blade at the preselected distance for a preselected period of time before the actuating means is de-energized whereby the damper blade is actuated to move to a second open position, and, the second control circuit includes means for energizing the actuating means to a position to cause the closing of the damper blade.
Even more particularly, the present invention provides a damper control arrangement comprising a housing wall having an ~06747~3 orifice therein, a damper blade movably positioned selectively between at least one open posi.tion and a closed position in relation to the ori~ice; damper blade moving means in communica-tion with the damper blade for moving the damper blade relative to the housing wall, actuating means operable to actuate the damper blade moving means for movement of the damper blade from~one position to another, the actuating means including control means for the damper blade moving means actuated in response to a first control circuit and a second control circuit wherein (1) the first control circuit includes a normally open switch means closed to a first position, the switch means in the first closed position being in series with two branch circuits in parallel, the first of the branch circuits including a normally open first contact swltch and a first contactor actuating means whereby the first contactor actuating means actuates the actuating~means to a first position upon closing the normally open first contact switch, the second of the branches including a normally open limit switch and a first contact relay which operates the normal-ly open first contact switch, the normally open llmit switch being operable in response to selected movement of the damper blade whereby when the damper blade moves a preselected distance the limit switch is actuated to a closed position.thereby ener-gizing the contact relay which closes the normally open first contact switch, actuating the first contactor.actuating means which in turn actuates the actuating means to its original posi-tion' and, (2) the second control circuit includes the normally open switch means closed to a second position, the first con-tactor actuatlng means and a second contactor actuating means whereby the ~irst and second contactor actuating means actuates the actuating means to a second position upon closin~ the normal-ly open switch means to the second position.
It is to be understood that the description of the `~ 1067478 examples of the present invention given hereinafter are not by way of limitation and various modifications within the scope of the present invention will occur to those skilled in the art upon reading the disclosure set forth hereinafter.
Referring to the drawing The Figure is an elevational view, partially in cross-section, of one preferred embodiment of the invention of this disclosure includin~ an electrical schematic for operating the preferred embodiment.
The Figure of the drawing illustrates the struc-ture of a damper assembly 2 operable in response to the operation of the damper blade moving means, exemplified as fluid cylinder 4, the fluid being generally either hydraulic or pneumatic. How-ever, it is realized that the damper blade moving means may be other mechanical means such as a motorized drive with appropriate gearing. Fluid pressure for operation of the fluid cylinder 4, as exemplified, is supplied from the actuating means, exemplified as a single coil, three positions spring return to center, and remote air pllot operated solenoid valve means 6 which is adapted to supply fluid to compartment A of the cylinder 4 through line 8 and into the other compartment, compartment B, of the fluid cylinder 4 through appropriate conduit piping 10, the compart-ments A and B of cylinder 4 defined by the position of piston means 82, to be discussed hereinafter.
Supply of fluid to the fluid-cylinder 4 is determined by the position of the slideable valve portion 20 of the valve means 6 in response to the operation of the coil solenoids 12 and 14. Solenoids 12 and 14 include biasing means 16 and 18, respectively, whereby upon energization, the positioning of the slideable valve portion 20 which is disposed within the housing 24, determines which conduits supplies fluid to the selected compartment of the cylinder 4, as discussed hereinafter. It is ~06~78 also realized that the e~emplified actuating means 6 may be, ~or example, a reversible starter if the damper moving means 4 is, ~or example, a motorized drive with appropriate gearing. It will become apparent to those skilled in the art that even further substitutions may be made with actuating means from the damper moving means which are operable in response to electrical cir-cuitry, which will be discussed hereinafter, without departing from the scope and spirit of the present invention.
The valve means 6 includes five flow-through openings 26, 28, 30, 32 and 34 therein in the housing portion 24. Open-ings 26 and 28 communicate with conduits 8 and 10, respectively, openings 30 and 34 are in communication with exhaust conduits 36 and 38, respectively, and opening 32. is in fluid communicatlon with a fluid supply source conduit 40, conduit 40 supplying the pressurized fluid to the fluid cylinder 4 by means of the control : valve 6. In the Figure, solenoid 14 including blasing means :
18, is further provided with slideable valve means 15 which includes three flow-through openings 17, 19 and 21 therein.
Opening 17 communicates with a fluid supply conduit 29, conduit 29 supplying the pressurized fluid to a fluid cylinder 27 by means of the valve means 15 and conduit 25. When solenoid 14 is energized, opening 21 is in fIow-through alignment with conduit 25 to exhaust the pressurized fluid from the fluid cylinder 27.
When solenoid 14 is de-energized, opening 19 is in flow-through alignment with conduit 25 thereby supplying pressurized fluid from the supply source conduit 29 through flow-through opening . 17 to the fluid cyIinder 270 It is noted that when solenoids 12 and 14 are de-energized a flow-through passage 48 i.s aligned for ~low-through communication with conduit 40, the supply fluid conduit, and conduit 10 with flow-through passage 46 being aligned between openings.26 and 34 to provide for the exhausting of the fIuid from the fluid cylinder 4 through fluid conduit 8 and the exhaust conduit 38. ~nerg.ization of solenoids 12 and 14 urges valve portion 20 to a position within control valve means 6 so that flow-through passage 44 is aligned with opening 32 and opening .
26 thereby providing fluid from conduit 44 to the fluid cylinder 4 through fluid condult 8 with flow-through opening 42 being aligned with openings 28 and 30 providing for flow-through comm-unication between conduit 10 and e~haust line 36. -When soienoid 12 is de-energized and solenoid 14 i9 energized, the slideable valve portion 20 is locked in its original position, as illustra-ted in the Figur~e,~and all openings to the control valve means 6 are closed off.
Means for energizing solenoids 12 and 14 is through electrical circuitry hereinafter referred to as first and second control circuits. Each of the circuits include the three-way main control circuit switch 50, the first control circuit being energized by actuating main control circuit switch 50 to a closed position at contact 53 and the second control circuit being energized by actuating main con:trol circuit swi.tch 50 to a closed position at.52 and 54. : ::
rrhe first control circuit is comprised of two branch circuits, the first branch circuit including a first contactor actuating means, exemplified as solenoid co11 winding 78, coil winding 78 being the actuating winding for solenoid 14. The first branch circuit ~urther lncludes normally open contact relay switch 56 which is operable in response to energization of contact relay 62. Contact relay 62 including wind1ng 66 is energized through the second branch electricsl conduit 64 which ~-includes normally open limit switch 68 and normally open contact switch 53. Thus, when the control switch 50 is closed to position 53, coil 78 is maintained energized providing control relay 62 is energized. Upon de-energization of contact relay 62, 106747~
normally open contact switch 56 opens thèreby breaking the cir-cuit which supplies electrical energy to the coil winding 78.
Furthermore, limit switch 68 must also be closed in order to maintain contact relay 62 in an energized condition.
Also provided in the first electrical circuit is a normally closed contact switch 72 operable in response to energization of timing element 73 of timing device 74; element 73 and switch 72 being in parallel with contact relay coil 66.
In operation, upon closing of the normally open limit switch 68 electrical energy is supplied to coil 66 thereby actuating contact relay 62 closing the normally open contact switch 56, energizing coil 78, and energizing timing element 73.
Timing element 73, after a preselected period of time, times out, opening normally closed timing swltch 72. Opening contact switch 72 de-energizes solenoid 14 through coil 78.
The second electrical control circuit includes the main control switch 50 situated to closed positions 52 and 54 and electrical coil 78 and electrlcal coil 60 whlch supplies electrical energy for the operation of the solenoids 14 and 12, respectively. Thus, when the main control switch 50 is in the closed positions at 52 and 54, solenoids 12 and 14 are operable to provide fluid to the fluid cylinder 4, as discussed previously.
In the first electrical control circuit, the normally open limit switch 68 is operable in response to the movement of transversely extending arm 80 which is fixedly attached to the connecting rod 84, connection rod 84 being disposed between and fixedly attached to the damper assembly 2 at one end and the piston 82 at the other for slideable movement through and in fluid tight relation~with an opening in housing 4. Movement of arm 80 against and in contacting relationship with the limit switch contacting arm 81 actuates the limit switch 68 to a closed position thereby energizing the first electrical control i - 8 -06~747~3 ~
circuit as discussed previously.
In the ~igure the damper blade 92 is shown in a closed position in fluid tight relationship with seal 93 which surrounds orifice 86 and plate 87. Blade 92 is held in position and 9up-ported by support frame 85 and transversel~ extending rod 84 con-- necting blade 92 to piston 82 within cylinder 4. Cylinder 4 is generally a pneumatic or hydraulic cylinder actuated, as descrlb-ed previously, by co~trol valve 6 and supported by support frame 85 outside of the fluid passageway. A cylindrical projec-tion 90 is attached on the orifice side of damper blade 92 to provide a fluid passageway of constant cross sectional area during a preselected portion of the stroke of the damper blade 92. This can be seen from-the dashed lines in the Figure.
During a préselected period of the damper blade~stroke cylindri-cal projection 90 is passed through orifice 86 thereby defining an annular;opening between the sidewalls and orifice 86. Also, as can be seen from the Figure,-during initial stages of opening of the damper assembly 2, damper blade 92 will be moved upwardly from its fluid tight position on the seal 93. When this happens, cylindrical projection 90 remains in juxtaposition with orifice 86 and a constant flow of fluid will be allowed to pass through damper assembly 2 between the annular space defined between the cylindrical projection 90 and the plate defining orifice 86.
Cylindrical projection 90 therefore acts as a buffer which in effect provides for a smooth transition, for example, cloth filter bags are being returned onstream after cleaning. In normal operation, for example, with the baghouse including a plurallty of cloth filter bags, the amount of initial opening o~f the orifice 86 is only one or two inches before the contact arm 81 is contacted by the transversely extending arm 80 whi-ch stops the movement of the damper assembly 2. It is further realized that in close control of the damper blade away from the orifice .
-` ~06747~3 86 a cylindrical portion 90 is not necessary.
It i9 reaIized that the damper assembly may take on other shapes and structures, such as those described in U.S.
Patent No. 3,752,439. However, it is noted that in the utili-zation of the damper assembly 2, as previously describedr a variable orifice is defined during the upper movement of the damper assembly 2. The varying orifice is then stopped at a p~eselected distance or partially open position, in relation to the opening 86 in wall 87. The`preselected damper assembly
This invention relates to a damper control arrangement and in particular relates to a damper control arrangement includ-ing means to selectively control the opening area o~ a flow-through orifice. Even more particularly, this invention relates to a damper con-trol arrangement which provides a selectively buffered transition in a system when starting or stopping the ~low of fluid in the system.
In many applications it is desirable to provide for a buffered transition when removing a fluid system from or returning a fluid system to different preselected fluid flow conditions.
For example, in the filtering of a gas stream using cloth fabric bags, it is desirable to avoid a sudden surge of gas when a gas controlling damper arrangement is activated, the sudden surges of gas causing the fabric filter bags to snap and consequently weaken the fabric material. This weakening of the fabric is intensified when the fabric material is one containing glass fibers.
Prior art damper arrangements, such as bullseye dampers and butterfly dampers, can only be made to function satisfactorily by using an expensive time actuating means which causes them to operate in a relatively slow manner. Even so, butterfly dampers are particularly difficult to use becuase the fluid flow rate does not change linearly wlth respect to the change in position of the damper blade as most of the fluid is controllable when ~he damper blade moves to a position substan-tially parallel to the direction of flow of the fluid. Less objectionable is the bullseye damper since its ~low rate changes linearly over the entire damper blade stroke.
In order to provide a control arrangement for a damper to selectively control the opening and closing of a flow-through orifice to provide a selectively buffered transition in a system when starting or stopping the flow of fluid therethrough, U.S.
-- 1 -- ~
``` ~067~78 3,8981997 has been proposed utilizing electrical actuating means to actuate the damper means for movement of the damper blade from one position to another. In this reference, when the damper ~lade is in an open positionl a soIenoid is required to be energized. Furthermorel when the device taught by the reference is used in combination with a filter system utiLizing a baghouse and the damper assembly is disposed in an inlet~air system to the baghousel when a compartment is being cleaned the damper is closed and one solenoid is de-energized, but a second solenoid is requlred to be energized. When putting the system back on stream and a soft-inflate is required, the one solenoid is energized and the second solenoid is de-energized until a pre-selected distance or preselected period of time has been satisfied.
Then, the energized solenoid is de-energized. After the cycle is ready to end the low flow rate, the de-energized solenoid is then re-energized to open the damper and remains in the energized position during the normal operation of the system.
In the present invention, it is recognized that it is desirable to provide a damper control arrangement for selectively controlling the opening and closing of a flow-through orifice and it is further recognized that it is desirable to provide a damper control arrangement which is straightforward, inexpensive, readily constructed and easily maintained.
The present invention advantageously provides a straight-forward arrangement for a damper control arrangement which includes means to control the opening and closing of flow-through an orifice.
The present invention further provides a damper contro] arrange-ment which is inexpensive, sturdy, easy and quickly operable and yet effective during operating conditions. The present invention even further provides a damper control arrangement which is use-ful where, for example, the gentle inflation of a gas filter bag, as it is being put onstream, utilizes solenoid valves to maintain 1067~78 the damper in its fully closed position when said solenoids are energized and a fully open or normal operating condition when both solenoids are de-energized and at intermediate holding positions of the damper assembly, one solenoid is energized and another solenoid is de-energi2ed.
Various other features of the present invention will become obvious to those skilled in the art upon reading the disclosure set forth hereinafter.
More particularly, the present invention provides a damper control arrangement comprising: a housing wall having an orifice therein, a damper blade movably positioned selectively between at least one open position and a closed position in relation to the orifice, damper blade moving means in communica-tion with the damper blade for moving the damper blade relative to the housing wall, actuating means operable to actuate the damper blade moving means for movement of the damper blade from one position to another, the actuating means including control means for the damper blade moving means actuated in response to a first control circuit and a second control circuit wherein the first control circuit includes means for de-energizing the actuating means to a position to cause the selective opening of the orifice by moving the damper blade a preselected distance, means for energizing the actuating means once the damper blade has traveled a preselected distance, and a timing device arranged to maintain the damper blade at the preselected distance for a preselected period of time before the actuating means is de-energized whereby the damper blade is actuated to move to a second open position, and, the second control circuit includes means for energizing the actuating means to a position to cause the closing of the damper blade.
Even more particularly, the present invention provides a damper control arrangement comprising a housing wall having an ~06747~3 orifice therein, a damper blade movably positioned selectively between at least one open posi.tion and a closed position in relation to the ori~ice; damper blade moving means in communica-tion with the damper blade for moving the damper blade relative to the housing wall, actuating means operable to actuate the damper blade moving means for movement of the damper blade from~one position to another, the actuating means including control means for the damper blade moving means actuated in response to a first control circuit and a second control circuit wherein (1) the first control circuit includes a normally open switch means closed to a first position, the switch means in the first closed position being in series with two branch circuits in parallel, the first of the branch circuits including a normally open first contact swltch and a first contactor actuating means whereby the first contactor actuating means actuates the actuating~means to a first position upon closing the normally open first contact switch, the second of the branches including a normally open limit switch and a first contact relay which operates the normal-ly open first contact switch, the normally open llmit switch being operable in response to selected movement of the damper blade whereby when the damper blade moves a preselected distance the limit switch is actuated to a closed position.thereby ener-gizing the contact relay which closes the normally open first contact switch, actuating the first contactor.actuating means which in turn actuates the actuating means to its original posi-tion' and, (2) the second control circuit includes the normally open switch means closed to a second position, the first con-tactor actuatlng means and a second contactor actuating means whereby the ~irst and second contactor actuating means actuates the actuating means to a second position upon closin~ the normal-ly open switch means to the second position.
It is to be understood that the description of the `~ 1067478 examples of the present invention given hereinafter are not by way of limitation and various modifications within the scope of the present invention will occur to those skilled in the art upon reading the disclosure set forth hereinafter.
Referring to the drawing The Figure is an elevational view, partially in cross-section, of one preferred embodiment of the invention of this disclosure includin~ an electrical schematic for operating the preferred embodiment.
The Figure of the drawing illustrates the struc-ture of a damper assembly 2 operable in response to the operation of the damper blade moving means, exemplified as fluid cylinder 4, the fluid being generally either hydraulic or pneumatic. How-ever, it is realized that the damper blade moving means may be other mechanical means such as a motorized drive with appropriate gearing. Fluid pressure for operation of the fluid cylinder 4, as exemplified, is supplied from the actuating means, exemplified as a single coil, three positions spring return to center, and remote air pllot operated solenoid valve means 6 which is adapted to supply fluid to compartment A of the cylinder 4 through line 8 and into the other compartment, compartment B, of the fluid cylinder 4 through appropriate conduit piping 10, the compart-ments A and B of cylinder 4 defined by the position of piston means 82, to be discussed hereinafter.
Supply of fluid to the fluid-cylinder 4 is determined by the position of the slideable valve portion 20 of the valve means 6 in response to the operation of the coil solenoids 12 and 14. Solenoids 12 and 14 include biasing means 16 and 18, respectively, whereby upon energization, the positioning of the slideable valve portion 20 which is disposed within the housing 24, determines which conduits supplies fluid to the selected compartment of the cylinder 4, as discussed hereinafter. It is ~06~78 also realized that the e~emplified actuating means 6 may be, ~or example, a reversible starter if the damper moving means 4 is, ~or example, a motorized drive with appropriate gearing. It will become apparent to those skilled in the art that even further substitutions may be made with actuating means from the damper moving means which are operable in response to electrical cir-cuitry, which will be discussed hereinafter, without departing from the scope and spirit of the present invention.
The valve means 6 includes five flow-through openings 26, 28, 30, 32 and 34 therein in the housing portion 24. Open-ings 26 and 28 communicate with conduits 8 and 10, respectively, openings 30 and 34 are in communication with exhaust conduits 36 and 38, respectively, and opening 32. is in fluid communicatlon with a fluid supply source conduit 40, conduit 40 supplying the pressurized fluid to the fluid cylinder 4 by means of the control : valve 6. In the Figure, solenoid 14 including blasing means :
18, is further provided with slideable valve means 15 which includes three flow-through openings 17, 19 and 21 therein.
Opening 17 communicates with a fluid supply conduit 29, conduit 29 supplying the pressurized fluid to a fluid cylinder 27 by means of the valve means 15 and conduit 25. When solenoid 14 is energized, opening 21 is in fIow-through alignment with conduit 25 to exhaust the pressurized fluid from the fluid cylinder 27.
When solenoid 14 is de-energized, opening 19 is in flow-through alignment with conduit 25 thereby supplying pressurized fluid from the supply source conduit 29 through flow-through opening . 17 to the fluid cyIinder 270 It is noted that when solenoids 12 and 14 are de-energized a flow-through passage 48 i.s aligned for ~low-through communication with conduit 40, the supply fluid conduit, and conduit 10 with flow-through passage 46 being aligned between openings.26 and 34 to provide for the exhausting of the fIuid from the fluid cylinder 4 through fluid conduit 8 and the exhaust conduit 38. ~nerg.ization of solenoids 12 and 14 urges valve portion 20 to a position within control valve means 6 so that flow-through passage 44 is aligned with opening 32 and opening .
26 thereby providing fluid from conduit 44 to the fluid cylinder 4 through fluid condult 8 with flow-through opening 42 being aligned with openings 28 and 30 providing for flow-through comm-unication between conduit 10 and e~haust line 36. -When soienoid 12 is de-energized and solenoid 14 i9 energized, the slideable valve portion 20 is locked in its original position, as illustra-ted in the Figur~e,~and all openings to the control valve means 6 are closed off.
Means for energizing solenoids 12 and 14 is through electrical circuitry hereinafter referred to as first and second control circuits. Each of the circuits include the three-way main control circuit switch 50, the first control circuit being energized by actuating main control circuit switch 50 to a closed position at contact 53 and the second control circuit being energized by actuating main con:trol circuit swi.tch 50 to a closed position at.52 and 54. : ::
rrhe first control circuit is comprised of two branch circuits, the first branch circuit including a first contactor actuating means, exemplified as solenoid co11 winding 78, coil winding 78 being the actuating winding for solenoid 14. The first branch circuit ~urther lncludes normally open contact relay switch 56 which is operable in response to energization of contact relay 62. Contact relay 62 including wind1ng 66 is energized through the second branch electricsl conduit 64 which ~-includes normally open limit switch 68 and normally open contact switch 53. Thus, when the control switch 50 is closed to position 53, coil 78 is maintained energized providing control relay 62 is energized. Upon de-energization of contact relay 62, 106747~
normally open contact switch 56 opens thèreby breaking the cir-cuit which supplies electrical energy to the coil winding 78.
Furthermore, limit switch 68 must also be closed in order to maintain contact relay 62 in an energized condition.
Also provided in the first electrical circuit is a normally closed contact switch 72 operable in response to energization of timing element 73 of timing device 74; element 73 and switch 72 being in parallel with contact relay coil 66.
In operation, upon closing of the normally open limit switch 68 electrical energy is supplied to coil 66 thereby actuating contact relay 62 closing the normally open contact switch 56, energizing coil 78, and energizing timing element 73.
Timing element 73, after a preselected period of time, times out, opening normally closed timing swltch 72. Opening contact switch 72 de-energizes solenoid 14 through coil 78.
The second electrical control circuit includes the main control switch 50 situated to closed positions 52 and 54 and electrical coil 78 and electrlcal coil 60 whlch supplies electrical energy for the operation of the solenoids 14 and 12, respectively. Thus, when the main control switch 50 is in the closed positions at 52 and 54, solenoids 12 and 14 are operable to provide fluid to the fluid cylinder 4, as discussed previously.
In the first electrical control circuit, the normally open limit switch 68 is operable in response to the movement of transversely extending arm 80 which is fixedly attached to the connecting rod 84, connection rod 84 being disposed between and fixedly attached to the damper assembly 2 at one end and the piston 82 at the other for slideable movement through and in fluid tight relation~with an opening in housing 4. Movement of arm 80 against and in contacting relationship with the limit switch contacting arm 81 actuates the limit switch 68 to a closed position thereby energizing the first electrical control i - 8 -06~747~3 ~
circuit as discussed previously.
In the ~igure the damper blade 92 is shown in a closed position in fluid tight relationship with seal 93 which surrounds orifice 86 and plate 87. Blade 92 is held in position and 9up-ported by support frame 85 and transversel~ extending rod 84 con-- necting blade 92 to piston 82 within cylinder 4. Cylinder 4 is generally a pneumatic or hydraulic cylinder actuated, as descrlb-ed previously, by co~trol valve 6 and supported by support frame 85 outside of the fluid passageway. A cylindrical projec-tion 90 is attached on the orifice side of damper blade 92 to provide a fluid passageway of constant cross sectional area during a preselected portion of the stroke of the damper blade 92. This can be seen from-the dashed lines in the Figure.
During a préselected period of the damper blade~stroke cylindri-cal projection 90 is passed through orifice 86 thereby defining an annular;opening between the sidewalls and orifice 86. Also, as can be seen from the Figure,-during initial stages of opening of the damper assembly 2, damper blade 92 will be moved upwardly from its fluid tight position on the seal 93. When this happens, cylindrical projection 90 remains in juxtaposition with orifice 86 and a constant flow of fluid will be allowed to pass through damper assembly 2 between the annular space defined between the cylindrical projection 90 and the plate defining orifice 86.
Cylindrical projection 90 therefore acts as a buffer which in effect provides for a smooth transition, for example, cloth filter bags are being returned onstream after cleaning. In normal operation, for example, with the baghouse including a plurallty of cloth filter bags, the amount of initial opening o~f the orifice 86 is only one or two inches before the contact arm 81 is contacted by the transversely extending arm 80 whi-ch stops the movement of the damper assembly 2. It is further realized that in close control of the damper blade away from the orifice .
-` ~06747~3 86 a cylindrical portion 90 is not necessary.
It i9 reaIized that the damper assembly may take on other shapes and structures, such as those described in U.S.
Patent No. 3,752,439. However, it is noted that in the utili-zation of the damper assembly 2, as previously describedr a variable orifice is defined during the upper movement of the damper assembly 2. The varying orifice is then stopped at a p~eselected distance or partially open position, in relation to the opening 86 in wall 87. The`preselected damper assembly
2 remains in this partially open position for actuating means : becomes operable and forces the damper assembly 2 to its fully open position.
It will be realized that vàrious changes may be made to the specific embodiment shown and described without departing from the scope and principals of the present invention.
It will be realized that vàrious changes may be made to the specific embodiment shown and described without departing from the scope and principals of the present invention.
Claims (4)
1. A damper control arrangement comprising:
a) a housing wall having an orifice therein, b) a damper blade movably positioned selectively between at least one open position and a closed position in relation to said orifice;
c) damper blade moving means in communication with said damper blade for moving said damper blade relative to said housing wall;
d) actuating means operable to actuate said damper blade moving means for movement of said damper blade from one position to another, said actuating means including control means for said damper blade moving means aGtuated in response to a first control circuit and a second control circult wherein (1) said flrst control circuit includes means for de-energizing the actuating means to a position to cause the selective opening of the orifice by moving said damper blade a preselected distance, means for energizing the actuating means once said damper blade has traveled said preselected distance, and a timing device arranged to maintain said damper blade at said preselected distance for a preselected period of time before said actuating means is de-energized whereby said damper blade is actuated to move to a second open position, and, (2) said second control circuit includes means for ener-gizing said actuating means to a position to cause the closing of said damper blade.
a) a housing wall having an orifice therein, b) a damper blade movably positioned selectively between at least one open position and a closed position in relation to said orifice;
c) damper blade moving means in communication with said damper blade for moving said damper blade relative to said housing wall;
d) actuating means operable to actuate said damper blade moving means for movement of said damper blade from one position to another, said actuating means including control means for said damper blade moving means aGtuated in response to a first control circuit and a second control circult wherein (1) said flrst control circuit includes means for de-energizing the actuating means to a position to cause the selective opening of the orifice by moving said damper blade a preselected distance, means for energizing the actuating means once said damper blade has traveled said preselected distance, and a timing device arranged to maintain said damper blade at said preselected distance for a preselected period of time before said actuating means is de-energized whereby said damper blade is actuated to move to a second open position, and, (2) said second control circuit includes means for ener-gizing said actuating means to a position to cause the closing of said damper blade.
2. The damper control arrangement of claim 1, wherein said damper blade moving means includes a housing having a plurality of openings and a slideably mounted piston therein with a transversely extending rod attached at one end to said piston and at the other end to said damper blade, said rod extending through one of said openings in said housing for slideable movement therethrough in a substantially fluid tight communication, said piston being of substantially the same geometric configuration and substantially the same cross sectional area as the inside configuration of said housing whereby said piston separates said housing into two compartments in substantially non-flow through relation, at least two of said openings being disposed in substantially opposite ends of said housing in fluid communication with fluid pressure means whereby fluid pressure on one side of said piston actuates said damper blade for movement in one direction and fluid pressure on the other side of said piston actuates said damper blade for movement in an opposite direction.
3. The damper control arrangement of claim 1, wherein said damper blade includes a baffle means positioned thereon in cooperative arrangement with said orifice to provide a flow-through opening defined by an edge of said orifice and said baffle means of constant cross-section during a predetermined portion of the damper blade stroke.
4. The damper control arrangement of claim 1, wherein:
said first control circuit includes a first branch including a first contactor actuating means, a normally open contact relay switch energized by a first contact relay, a normally open contact switch, said timing device, and a normally closed second contact switch operable to an open position in response to energization of said timing device, said timing device and said second contact switch being in parallel with said first contact relay whereby upon opening of said normally closed second contact switch said first actuating means is de-energized, and, said second control circuit includes a normally open limit switch and a normally open contact switch, when said limit switch is closed with said normally open contact switch closed and said first contact relay energized, said first contactor actuating means is energized, and when said first contact relay is de-energized said normally open contact relay switch opens de-energizing said first contactor actuating means.
said first control circuit includes a first branch including a first contactor actuating means, a normally open contact relay switch energized by a first contact relay, a normally open contact switch, said timing device, and a normally closed second contact switch operable to an open position in response to energization of said timing device, said timing device and said second contact switch being in parallel with said first contact relay whereby upon opening of said normally closed second contact switch said first actuating means is de-energized, and, said second control circuit includes a normally open limit switch and a normally open contact switch, when said limit switch is closed with said normally open contact switch closed and said first contact relay energized, said first contactor actuating means is energized, and when said first contact relay is de-energized said normally open contact relay switch opens de-energizing said first contactor actuating means.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US73399176A | 1976-10-20 | 1976-10-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1067478A true CA1067478A (en) | 1979-12-04 |
Family
ID=24949911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA279,095A Expired CA1067478A (en) | 1976-10-20 | 1977-05-25 | Control arrangement for a damper |
Country Status (18)
| Country | Link |
|---|---|
| JP (1) | JPS6029032B2 (en) |
| AR (1) | AR216475A1 (en) |
| AU (1) | AU2605377A (en) |
| BE (1) | BE856051A (en) |
| BR (1) | BR7706055A (en) |
| CA (1) | CA1067478A (en) |
| DD (1) | DD133606A5 (en) |
| DE (1) | DE2729621A1 (en) |
| DK (1) | DK464577A (en) |
| ES (1) | ES460496A1 (en) |
| FI (1) | FI772930A (en) |
| FR (1) | FR2368657A1 (en) |
| IT (1) | IT1080597B (en) |
| NL (1) | NL7708117A (en) |
| NO (1) | NO772107L (en) |
| PL (1) | PL201628A1 (en) |
| SE (1) | SE7706233L (en) |
| ZA (1) | ZA773113B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AUPN659695A0 (en) * | 1995-11-16 | 1995-12-07 | Wilson, George | Design of dust valves to reduce dust/fume redeposition in a dust/fume collector |
| AU720350B2 (en) * | 1995-11-16 | 2000-06-01 | George Wilson | A method of operating a filter cleaning system, a valve and an air/gas cleaning assembly |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3051432A (en) * | 1960-02-18 | 1962-08-28 | Sullivan Valve & Engineering Co | Two-stage hydromotor-operated valve |
| FR2243357A1 (en) * | 1974-04-18 | 1975-04-04 | Poclain Sa | Control device for body with reciprocating motion - electro-magnet and time relay control double acting ram distributor |
-
1977
- 1977-05-24 ZA ZA00773113A patent/ZA773113B/en unknown
- 1977-05-25 CA CA279,095A patent/CA1067478A/en not_active Expired
- 1977-05-27 SE SE7706233A patent/SE7706233L/en not_active Application Discontinuation
- 1977-06-14 AU AU26053/77A patent/AU2605377A/en not_active Expired
- 1977-06-15 NO NO772107A patent/NO772107L/en unknown
- 1977-06-23 BE BE178731A patent/BE856051A/en unknown
- 1977-06-27 FR FR7719649A patent/FR2368657A1/en not_active Withdrawn
- 1977-06-30 AR AR268281A patent/AR216475A1/en active
- 1977-06-30 DE DE19772729621 patent/DE2729621A1/en not_active Withdrawn
- 1977-07-05 JP JP52080356A patent/JPS6029032B2/en not_active Expired
- 1977-07-07 ES ES460496A patent/ES460496A1/en not_active Expired
- 1977-07-14 IT IT25754/77A patent/IT1080597B/en active
- 1977-07-21 NL NL7708117A patent/NL7708117A/en not_active Application Discontinuation
- 1977-09-12 BR BR7706055A patent/BR7706055A/en unknown
- 1977-10-05 FI FI772930A patent/FI772930A/en not_active Application Discontinuation
- 1977-10-19 DK DK464577A patent/DK464577A/en unknown
- 1977-10-20 PL PL20162877A patent/PL201628A1/en unknown
- 1977-10-20 DD DD7700201624A patent/DD133606A5/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| AR216475A1 (en) | 1979-12-28 |
| SE7706233L (en) | 1978-04-21 |
| FR2368657A1 (en) | 1978-05-19 |
| JPS6029032B2 (en) | 1985-07-08 |
| DD133606A5 (en) | 1979-01-10 |
| DK464577A (en) | 1978-04-21 |
| AU2605377A (en) | 1978-12-21 |
| BE856051A (en) | 1977-10-17 |
| FI772930A (en) | 1978-04-21 |
| ES460496A1 (en) | 1978-05-16 |
| BR7706055A (en) | 1978-07-04 |
| PL201628A1 (en) | 1978-05-08 |
| DE2729621A1 (en) | 1978-04-27 |
| NL7708117A (en) | 1978-04-24 |
| IT1080597B (en) | 1985-05-16 |
| ZA773113B (en) | 1978-04-26 |
| JPS5351523A (en) | 1978-05-11 |
| NO772107L (en) | 1978-04-21 |
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