CN101832286A - Automatic control device for forced draught fan - Google Patents
Automatic control device for forced draught fan Download PDFInfo
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- CN101832286A CN101832286A CN200910119213A CN200910119213A CN101832286A CN 101832286 A CN101832286 A CN 101832286A CN 200910119213 A CN200910119213 A CN 200910119213A CN 200910119213 A CN200910119213 A CN 200910119213A CN 101832286 A CN101832286 A CN 101832286A
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Abstract
The invention discloses a mechanical control device for automatically controlling a forced draught fan in the soft environment. A pilot valve, a discharge valve, a pneumatic switch, a pneumatic time delay valve and a pneumatic control valve are added into a pneumatic control loop which is formed by sequentially connecting a forced draught fan oil vapor tank, the pneumatic control valve, a hand operated valve, the discharge valve, an inverse proportion valve, a butterfly valve control cylinder, the pilot valve, a shuttle valve, a pressure maintaining valve and a ball valve pneumatic element; an explosion-proof electric contact pressure gauge is arranged in an electric pneumatic control loop; a time relay and an intermediate relay are connected in parallel with a magnetic starter control loop; a pressure gauge on the forced draught fan oil vapor tank is replaced by the explosion-proof electric contact pressure gauge; and a forced draught fan remote-control staring button loop is connected in series with the mechanical automatic control device of a toggle switch. When a pressure of a compressed air system is low, the forced draught fan automatically starts; and when the pressure of the compressed air system is high, the forced draught fan automatically delays and performs soft stop, and the system pressure is kept in a certain range. The automatic control device realizes automatic control, and automatic delay buffer stop, so that impact of high pressure gas on mechanical devices, such as an engine body and the like is relieved, potential safety hazard caused by overpressure of compressed air is removed, automatic start and automatic delay loading, automatic unloading, and automatic delay buffer stop are realized, and the whole procedure has the functions of automatic control and protection. The automatic control device for the forced draught fan has the advantages of simple structure, easy operation, convenient maintenance, safety, reliability and the like.
Description
Affiliated technical field
The present invention relates to the pressure fan automatic control technology, especially existing electric control circuit and pneumatic pilot line are being added a small amount of components and parts, can realize the automatic control of pressure fan under soft environment, and can effectively alleviate the damage of main compression member, gas control element, motor and shaft couplings such as cylinder, the repacking little investment has very high cost performance.
Background technique
At present, the former machine of SM series pressure fan of Sheng company production is controlled the magnetic starter of pressure fan by " manually " operation distant place control knob again, and realization is opened, shut down; Operate the manually operated valve that is installed on the Pneumatic control circuit by " manually " again, open or close the cylinder air inlet butterfly valve, realize that pressure fan adds, off-load.So; the control procedure of the former machine of pressure fan; only possess " manually " open, shut down and " manually " add, Load Alleviation Function; open and close machine process can only load and the low pressure buffer shutdown by " artificial time-delay " high pressure, particularly when system has a power failure suddenly, with the rigid impact that causes pressurized gas to equipment such as body, coupling and motor; reduce machine working life; increase maintenance, maintenance cost, even cause stopping production, enterprise is caused greater loss.In addition, aspect the pressurized gas overvoltage protection, former machine valve safe in utilization in case Pneumatic control circuit breaks down, will cause major safety risks as single over-voltage protection element.
Summary of the invention
In order to realize pressure fan automation control; the automatic time delay buffering is shut down; to slow down the impact of pressurized gas to machinery such as bodies; the potential safety hazard that produces when eliminating the pressurized gas overvoltage; the present invention increases by a cover compression gas in overpressure protective gear; only need add a small amount of components and parts, can realize that " automatically " starts, " automatically " time-delay loads, " automatically " unloads, " automatically " time-delay buffering is shut down, make whole process possess automation control and protective function.
The technical solution adopted for the present invention to solve the technical problems is:
1, pneumatic control aspect:
(1) in the manual loading pneumatic control circuit of forming by barrel of oil and gas, Pneumatic valve, manually operated valve, bleeder valve 16 control mouths, inverse proportion valve, butterfly valve control cylinder pneumatic element, between manually operated valve, bleeder valve 16 control mouths, increases a system pressure valve 10-1.
(2) on the air line system pressure valve, pick out one road Pneumatic control circuit in addition, in this loop, add bleeder valve 16-1, jettron successively.
(3) in the manual loading pneumatic control circuit, in bleeder valve 16 control mouthful and pick out a pilot line and receive on the control mouth of bleeder valve 16-1.
2, electrical control aspect:
(1) an explosion-proof pressure gauge with electric contact is installed on pressure fan air draft pipeline, is far controlled the start button loop and take over control the lower limit indicator of quick-fried pressure gauge with electric contact, utilize this loop to finish the pressure fan self-starting function at pressure fan.But for the needs of starting shooting or artificially selecting automatic/hand to start shooting for the first time, serial connection one toggle switch in this loop is so that disconnect or connection self-starting loop.
(2) in the 36V of pressure fan magnetic starter control loop and connect a time relay, one group of normally-closed contact of the time relay is concatenated into pressure fan far controls in the stop loop.The time relay is controlled by one group of normal opened contact of the jettron that pneumatic circuit is installed; when jettron drives its normal opened contact closure by gas; the time relay gets; the time relay is serially connected in one group of normally-closed contact in the stop loop through Time Delay Opening; disconnect the self-keeping circuit of pressure fan magnetic starter, realize shutting down.
(3) in the 36V of pressure fan magnetic starter control loop and connect an auxiliary reclay, one group of normally-closed contact of auxiliary reclay is concatenated into pressure fan far controls in the stop loop.The pressure gauge of installing on the pressure fan barrel of oil and gas is replaced by explosion-proof pressure gauge with electric contact; and the high limit indicator contact of this table is serially connected in the auxiliary reclay loop; when the barrel of oil and gas internal pressure reaches the CLV ceiling limit value of explosion-proof pressure gauge with electric contact setting; high limit indicator contacting auxiliary reclay loop; auxiliary reclay gets; one group of normally-closed contact that auxiliary reclay is serially connected in the stop loop is opened through instantaneous, disconnects the self-keeping circuit of pressure fan magnetic starter, realizes the protection shutdown.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is a Pneumatic control circuit schematic diagram of the present invention.
Fig. 2 is an electric control loop schematic diagram of the present invention.
Fig. 3 pneumatic control principle primitive figure (SM455-5160 system flow chart).
Fig. 4 electric control theory primitive figure.
Fig. 5 Pneumatic valve structural drawing
Fig. 6 inverse proportion valve structural drawing
Fig. 7 bleeder valve structural drawing
Fig. 8 system pressure valve structural drawing
Fig. 9 shuttle valve structural drawing
Figure 10 pressure relay structural drawing
Among Fig. 11, air-strainer, 2, suction valve, 3, body, 4, expansion pipe, 5, barrel of oil and gas, 6, the thin separator of oil, 7, pressure is kept valve, and 8, spherical valve, 9, air outlet slit, 10 (10-1), system pressure valve, 11, shuttle valve, 12, Pneumatic valve, 13, manually operated valve, 14, inverse proportion valve, 15, cylinder, 16 (16-1), bleeder valve, 17, thermostat valve, 18, cooler, 19, oil strainer, 20, the oil strainer differential pressure switch, 21, oil pressure gauge, 22, motor, 23,23-1, explosion-proof pressure gauge with electric contact, 24, the thin separator differential pressure switch of oil, 25, thermal switch, 26, safety valve, 27, see oily mirror, 28, oil drain valve, 29, coupling, 30, jettron.
GHK among Fig. 2; isolating switch, CJ; vacuum contactor, ZR; the capacitance-resistance absorption plant; LHA; LHB; LHC; current transformer, GRD; high tension fuse, BK1; control transformer; 1RD; 2RD; fus, BK2; the intrinsic safety transformer, R3; resistance; V1; diode, C1; electric capacity, XJ1; carry out relay; TA1; stop the reset button of holding concurrently; TA2; emergency stop button, BJ-10; the motor protector output contact, 1K; far and near control throw over switch; QA; advance to control start button; YQA; control start button far away, YTA; control stop button far away, K; manual throw over switch; R1; resistance; XJ2; relay, ZL; rectifier bridge, ZJ; auxiliary reclay; SJ; the time relay; ZJ-1; auxiliary reclay, CJ; vacuum contactor suction coil, DK; jettron; DJ1; explosion-proof pressure gauge with electric contact; DJ2; explosion-proof pressure gauge with electric contact, BJ motor protector, HK; test switch.
Among Fig. 31, air-strainer 2, suction valve 3, body 4, expansion pipe 5, barrel of oil and gas 6, the thin separator 7 of oil, pressure is kept valve 8, spherical valve 9, air outlet slit 10, system pressure valve 11, shuttle valve 12, Pneumatic valve 13, manually operated valve 14, inverse proportion valve 15, cylinder 16, bleeder valve 17, thermostat valve 18, cooler 19, oil strainer 20, oil strainer differential pressure switch 21, oil pressure gauge 22, motor 23, pressure gauge 24, the thin separator differential pressure switch 25 of oil, thermal switch 26, safety valve 27, see oily mirror 28, oil drain valve 29, coupling.
Among Fig. 4; GHK; isolating switch, CJ; vacuum contactor, ZR; the capacitance-resistance absorption plant; LHA; LHB; LHC; current transformer, GRD; high tension fuse, BK1; control transformer; 1RD; 2RD; fus, BK2; the intrinsic safety transformer, R3; resistance; V1; diode, C1; electric capacity, XJ1; carry out relay; TA1; stop the reset button of holding concurrently, TA2; emergency stop button, BJ-10; the motor protector output contact; 1K; far and near control throw over switch; QA; advance to control start button, YQA; control start button far away, YTA; control stop button far away; R1; resistance; XJ2; relay, ZL; rectifier bridge, ZJ; auxiliary reclay; the BJ motor protector, HK; test switch.
Among Fig. 5, Pneumatic valve
Long the remaining silent of the long opening 2-1 of 4-control mouthful 3-2
Among Fig. 6, inverse proportion valve
1, valve body 2, valve gap 3, adjusting nut 4, spring 5, diaphragm 6, thimble 7, thimble bounce-back spring 8, air intlet 9, air outlet slit 10, spool 11, regulating valve stem
Among Fig. 7, bleeder valve
1, control mouth 2, air intlet 3, air outlet slit
Among Fig. 8, system pressure valve
1, valve body 2, adjusting nut 3, back of the body cap 4, spring 5, air outlet slit 6, air intlet 7, valve rod 8, spool
Among Fig. 9, shuttle valve (2/2-way valve)
1, air outlet slit 2, air intlet 3, air intlet
Among Figure 10, pressure relay
5-control mouthful 1-2 normal opened contact 3-4 break contact
Specific implementation method
(1) basic principle: press pressure fan start-up control button; after opening pressure fan; manual loading; in pressure fan boosts process gradually; this device electrical control " hand/automatic " throw over switch is allocated to " automatically " position; when pressure fan exhaust duct way outlet pressure reached artificial setting " height " force value, this device jettron was connected the electric stop loop of motor control magnetic starter, through this device time-delay autostop.When compressed-air system pressure dropped to artificial setting self-starting " low " force value gradually, after the conversion of this device, blower fan was opened automatically, and finishes automatic loading, and blower fan is run well, and system pressure constantly rises.When system pressure rose and reaches artificial setting " height " force value, automatic time delay was shut down, and finished " start → loading → time-delay an is shut down " circulation automatically.
(2) specific implementation method
1, manually start
Hand/moving throw over switch (K) is got to manual position, will be far away/closely to control throw over switch (1K) to get to controlled position far away, the major loop that closes is isolated commutation disconnecting link (GHK).Control transformer (BK1) secondary 36V power supply is 18V through intrinsic safety transformer (BK2) step-down.Press pressure fan distant place start-up control button (YQA); connect magnetic starter guide loop; make the 18V power supply by intrinsic safety transformer (BK2) winding one end through resistance (R3)------the output contact (BJ-10) of motor protector (BJ)--emergency stop button (TA2)----break contact of the break contact-auxiliary reclay (ZJ-1) of distant place start button (YQA)--distant place stop button (the YTA)--time relay (SJ)-far away/closely the control the other end that throw over switch (1K) is got back to intrinsic safety transformer (BK2) winding far away/as closely to control throw over switch (1K) that stops the reset button (TA1) of holding concurrently of carrying out relay (XJ1); carrying out relay (XJ1) coil has electric current to pass through; its normal opened contact (XJ1) is connected the DC loop of carrying out relay (XJ2) place; making to carry out in relay (XJ2) coil has electric current to pass through; its normal opened contact (XJ2) is connected the interchange 36V control loop at auxiliary reclay (ZJ) place; there is electric current to pass through in auxiliary reclay (ZJ) coil; its normal opened contact (ZJ2) is connected the control loop at the suction coil place of vacuum contactor (CJ); electric current is arranged by producing magnetic force in the suction coil (CJ); adhesive major loop vacuum contactor (CJ); the pressure fan motor gets electric operation, finishes the process of manually booting.After unclamping distant place start button (YQA), because vacuum contactor (CJ) adhesive, its auxiliary normal opened contact (CJ) is closed in guide's control loop, the self-insurance of guide loop, keep long-term the getting of execution relay (XJ1) coil, keep vacuum contactor (CJ) adhesive, keep the operation of pressure fan motor.Behind the manually opened pressure fan, manually connect manually operated valve (13), in pressure fan boosts process gradually, this device electrical control hand/automatic change-over (K) is allocated to " automatically " position.
2, load automatically
Manually after the start, pressure in the barrel of oil and gas (5) constantly rises, pressure arrives manually operated valve (13) (manually operated valve is in open mode) by Pneumatic valve (12), arrive system pressure valve (10-1), when system pressure rises to system pressure valve (10-1) setting value, system pressure valve (10-1) opens that (effect of system pressure valve is to allow the pressure in the barrel of oil and gas rise, under the effect of pressure, make lubricant oil constantly circulation in system), the one tunnel enters two bleeder valves (16), control mouth (16-1), another road pressure is by inverse proportion valve (14), enter cylinder (15), cylinder (15) backs down the butterfly valve of suction valve (2) lining, after butterfly valve is opened, finishes whole automatic loading procedure.
3, unloading automatically
When air feed system pressure rises to system pressure valve (10) setting value, system pressure valve (10) is opened, one the tunnel enters bleeder valve (16) suction port, another road pressure enters shuttle valve (11), enters Pneumatic valve (12) by shuttle valve (11), and Pneumatic valve (12) obtains pressure signal and closes, end, turn-off the pressurized gas passage of barrel of oil and gas (5) to cylinder (15), cylinder (15) is closed unloading automatically because of the butterfly valve that loses pressure drive suction valve (2) lining.Simultaneously, the control mouth decompression of two bleeder valves (16), (16-1), bleeder valve (16) begins to release pressurized gas in the barrel of oil and gas (5) to suction valve (2), and the pressurized gas in the barrel of oil and gas (5) are slowly discharged.
4, automatic time delay is shut down
Automatically unloading the later stage, bleeder valve (16-1) is released pressurized gas to jettron (30), normal opened contact (DK) closure in the jettron (30), connect the 36V control loop at the time relay (SJ) place in the magnetic starter, move by electric current in the time relay (SJ) coil, make the normal opened contact Time Delay Opening of the time relay (SJ) in the guide loop, disconnect the guide loop, carry out relay (XJ1) coil losing electricity, its normal opened contact (XJ1) disconnects, order disconnects and carries out relay (XJ2) then, auxiliary reclay (ZJ) control loop makes vacuum contactor (CJ) suction coil losing electricity, disconnects the electric electromechanics resource loop.Simultaneously, vacuum contactor assists normal opened contact (CJ) to open self-insurance contact in the guide loop, finishes automatic time delay and shuts down.
5, Auto Power On
After pressure fan is shut down; pressure fan air feed pipe network internal pressure will be because of the reduction gradually that stops of pressure fan; when the pressure of the explosion-proof pressure gauge with electric contact (23-1) on being installed in the pressure fan relief opening drops to the low pressure limit value of artificial setting air feed network; its low pressure limit contact (DJ1) closure; connect the guide loop; making to carry out in relay (XJ1) coil has electric current to pass through; connect successively and carry out relay (XJ2); auxiliary reclay (ZJ) and vacuum contactor (CJ) suction coil control circuit; vacuum contactor (CJ) adhesive; the motor connecting power operation realizes Auto Power On.
Automatically finish loading procedure after the start.
6, overvoltage protection
In automatic uninstall process; if in the time of can't realizing autostop because of pneumatic pilot line or components and parts fault; because pressure fan remains in operation; barrel of oil and gas (5) internal pressure will continue to raise; reach the explosion-proof pressure gauge with electric contact (23) that is installed in barrel of oil and gas (5) the artificial force value of setting of reaching the standard grade; make upper pressure limit contact (DJ2) connect the control loop at auxiliary reclay (ZJ-1) place in the magnetic starter; auxiliary reclay (ZJ-1) coil has electric current to pass through action; the break contact (ZJ-1) that is connected in the guide loop is disconnected; carry out relay (XJ1) coil losing electricity; disconnect successively and carry out relay (XJ2); the control loop at auxiliary reclay (ZJ) and vacuum contactor (CJ) suction coil place; vacuum contactor (CJ) disconnects motor power, realizes instantaneous stoppage protection.
(3) gas control element explanation
Fig. 5 Pneumatic valve
Long the remaining silent of the long opening 1-2 of 4-control mouthful 2-3
After Pneumatic valve control mouth obtained pressure, the long opening of 2-3 became long remaining silent, and long the remaining silent of 1-2 becomes long opening
After Pneumatic valve control mouth lost pressure, long the remaining silent of 2-3 became long opening, and the long opening of 1-2 becomes long remaining silent
Fig. 6 inverse proportion valve
Pressure enters air intlet, to secondary chamber, when the value of air pressure during greater than the spring value, jack-up diaphragm, spool, the size of jack-up is exactly the aperture size to thimble, the big more thimble aperture of secondary cavity pressure is more little, air inflow is few.Otherwise, pressure more hour, the spring dynamics is greater than secondary chamber air pressure, the thimble that spool backs down is big more, air inflow is many.
Fig. 7 bleeder valve
When bleeder valve control mouth has pressure, (utilizing bleeder valve control mouth pressure) greater than air intlet pressure, air intlet can't back down, and after bleeder valve control mouthful decompression, air intlet backs down to air outlet slit.
Fig. 8 system pressure valve
When reaching the system pressure valve setting value, the spring dynamics is pressurizeed to spool, set by adjusting nut.Air intlet pressure must just can back down spool greater than the pressure of spring.
Fig. 9 shuttle valve (2/2-way valve)
When 2 air intlets have pressure, push the spool that moves about, 3 air intlets are closed, and 1 to air outlet slit.When 3 air intlets have pressure, push the spool that moves about, 2 air intlets are closed, and 1 to air outlet slit.
Figure 10 pressure relay
5-control mouthful 1-2 normal opened contact 3-4 break contact
After pressure relay control mouth obtained pressure, the 1-2 normal opened contact became break contact
The 3-4 break contact becomes normal opened contact
After pressure relay control mouth lost pressure, the 1-2 break contact became normal opened contact
The 3-4 normal opened contact becomes break contact.
Claims (4)
1. automatic control device for forced draught fan, Pneumatic control circuit by barrel of oil and gas, Pneumatic valve, manually operated valve, bleeder valve (16) control mouth, inverse proportion valve, butterfly valve control cylinder, system pressure valve, shuttle valve, pressure keep valve, the spherical valve pneumatic element is linked in sequence and forms, it is characterized in that: (1) is an increase system pressure valve (10-1) between manually operated valve, bleeder valve (16) control mouth; (2) on the air line system pressure valve, pick out one road Pneumatic control circuit in addition, in this loop, add bleeder valve (16-1), jettron successively; (3) in the manual loading pneumatic control circuit, in bleeder valve (16) control mouthful and pick out a pilot line and receive on the control mouth of bleeder valve (16-1).
2. electrical control aspect is characterized in that (1) install an explosion-proof pressure gauge with electric contact (23-1) on pressure fan air draft pipeline; (2) in the 36V of pressure fan magnetic starter control loop and connect a time relay; (3) in the 36V of pressure fan magnetic starter control loop and connect an auxiliary reclay; (4) pressure gauge of installing on the pressure fan barrel of oil and gas is replaced by explosion-proof pressure gauge with electric contact (23).
3. automatic control device for forced draught fan according to claim 1 is characterized in that: (1) Pneumatic control circuit; The system pressure valve (10-1) that increases is serially connected in the middle of manually operated valve, bleeder valve (16) the control mouth; Bleeder valve (16) is controlled mouth and is picked out a pilot line and receives on the control mouth of bleeder valve (16-1); Pick out one road Pneumatic control circuit on the system pressure valve in addition, bleeder valve (16-1), jettron are inserted successively, least significant end is a jettron; (2) electric control loop is far controlled the start button loop and is taken over control the lower limit indicator normally opened contact of quick-fried pressure gauge with electric contact at pressure fan; One group of normally-closed contact of the time relay is concatenated into pressure fan far controls in the stop loop, often open the control of (timing closing) contact for one group of the jettron (30) that the time relay is installed by pneumatic circuit; One group of normally-closed contact of auxiliary reclay is concatenated into pressure fan far to be controlled in the stop loop; The height of explosion-proof pressure gauge with electric contact (23) limit indicator normally opened contact is serially connected in the auxiliary reclay loop.
4. automatic control device for forced draught fan according to claim 1 is characterized in that " two one logical " toggle switch (K) of serial connection before pressure fan is far controlled the start button loop and taken over control the lower limit indicator normally opened contact of quick-fried pressure gauge with electric contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910119213A CN101832286A (en) | 2009-03-09 | 2009-03-09 | Automatic control device for forced draught fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910119213A CN101832286A (en) | 2009-03-09 | 2009-03-09 | Automatic control device for forced draught fan |
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| Publication Number | Publication Date |
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| CN101832286A true CN101832286A (en) | 2010-09-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910119213A Pending CN101832286A (en) | 2009-03-09 | 2009-03-09 | Automatic control device for forced draught fan |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102518858A (en) * | 2011-12-07 | 2012-06-27 | 珠海经济特区科茂橡塑材料有限公司 | Air pressure overload protection device |
| CN104747427A (en) * | 2013-12-25 | 2015-07-01 | 珠海格力电器股份有限公司 | Compressor testing device |
| CN113676083A (en) * | 2021-08-11 | 2021-11-19 | 西安中车永电电气有限公司 | Marine multi-interface magnetic starting system and control method thereof |
-
2009
- 2009-03-09 CN CN200910119213A patent/CN101832286A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102518858A (en) * | 2011-12-07 | 2012-06-27 | 珠海经济特区科茂橡塑材料有限公司 | Air pressure overload protection device |
| CN102518858B (en) * | 2011-12-07 | 2014-06-25 | 珠海经济特区科茂橡塑材料有限公司 | Air pressure overload protection device |
| CN104747427A (en) * | 2013-12-25 | 2015-07-01 | 珠海格力电器股份有限公司 | Compressor testing device |
| CN113676083A (en) * | 2021-08-11 | 2021-11-19 | 西安中车永电电气有限公司 | Marine multi-interface magnetic starting system and control method thereof |
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Application publication date: 20100915 |