CN102644604B - Automatic priming device for centrifugal pump - Google Patents
Automatic priming device for centrifugal pump Download PDFInfo
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- CN102644604B CN102644604B CN201210110589.1A CN201210110589A CN102644604B CN 102644604 B CN102644604 B CN 102644604B CN 201210110589 A CN201210110589 A CN 201210110589A CN 102644604 B CN102644604 B CN 102644604B
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Abstract
The invention discloses an automatic priming device for a centrifugal pump. The automatic priming device mainly comprises a centrifugal pump, a gas-liquid separating tank, a liquid level sensor, a controller, an injector and a valve, wherein the gas-liquid separating tank is connected with a sucking port of the centrifugal pump, the liquid level sensor and a second pneumatic valve; the input of the controller is connected with the liquid level sensor; the output of the controller is connected with an electromagnetic reversing valve; the electromagnetic reserving valve is connected with a first pneumatic valve, the second pneumatic valve and a cut-off valve; and the injector is connected with the second pneumatic valve and is simultaneously connected with the first pneumatic valve through a one-way check valve. According to the automatic priming device disclosed by the invention, the function of automatically priming is achieved and the condition that no cavitation phenomenon always occurs in the operation process of the centrifugal pump can be ensured. In addition, the automatic priming device has the advantages of simple structure, low manufacturing and maintaining cost and stability and reliability in operation and is especially suitable for priming before the start of a ship ballast pump, a bilge pump and an emergency firefighting pump.
Description
Technical field
The present invention relates to a kind of water diversion apparatus, relate in particular to a kind of centrifugal pump automatic water diversion device without suction capacity.
Background technique
Centrifugal pump belongs to vane pump, if the inside does not have water, blade rotary is to set up vacuum pressure, also just cannot suck water, therefore for centrifugal pump, there is no suction capacity.But the most applicable ballast pump, bilge pump and the emergency fire pump etc. done of centrifugal pump, by CCS code requirement, all burr pumps or dual-purpose burr pump all should have self-priming performance; More than if fire water pump or emergency fire pump are arranged in waterline, also should there is self-priming performance.The problem that there is no suction capacity in order to solve centrifugal pump all will add self-priming apparatus on pump.Self-priming water diversion apparatus common are two kinds: a kind of is Jet-Pump, it is with electromagnetic valve pressurized air, to do power to come the air in suction pump to form negative pressure through sparger, its solenoid valve when the startup of pump is switched on simultaneously and is opened air feed diversion, after time relay time delay, closes and quits work again.Another kind is water ring pump formula, it contacts with the shaft coupling of pump by friction clutch and drives water ring pump to come the air in suction pump to form negative pressure, this device also needs a little water tank to guarantee in water ring pump, there is water, when delivery side of pump reaches certain pressure, water pressure pushing clutch shaft makes it to throw off with the shaft coupling of pump, now, water diversion apparatus diversion is complete and quit work.For the first diversion mode, at the beginning of pump startup, in pump, do not fill water, but through after a period of time, in pump, just fill gradually water, therefore, pump, within a period of time just having brought into operation, can gather a certain amount of air in pump, produces cavitation phenomenons.In order to avoid and reduce the generation of cavitation phenomenons as far as possible, it should be first diversion recurrence pump, but this mode has been pump and diversion carries out simultaneously, obvious this mode can impact the working life of pump, and this mode another one deficiency is exactly, it is example that the centrifugal pump of take uses as ballast pump, after diversion, ballast pump enters normal working, liquid level decline along with ballast tank, at horn mouth, there is whirlpool, when whirlpool bottom approaches horn mouth, a large amount of gas will be inhaled into, therefore need the effect that a kind of device can play diversion badly, can guarantee again in the process of pump operation, all the time do not have a large amount of air and be inhaled into the water diversion apparatus in pump.For the second diversion mode, install relative complex, increased difficulty and the product cost of installation and maintenance.
CN201288937Y discloses a kind of " self-control type centrifugal pump vacuum priming device ", and this device is mainly comprised of vacuum pump, vacuum tank, the automatic air-dischanging water valve and the automatic control system that are loaded on water pump relief opening top.Vacuum pump operation produces vacuum water diversion, and automatic air-dischanging water valve stops water to enter vacuum pipe after water pump full water, and vacuum tank has formed degree of vacuum buffer area, and degree of vacuum is controlled the start and stop of vacuum pump automatically, thus while guaranteeing centrifugal pump standby all the time in full water state.This device has advantages of self-absorption function and can be many pump diversions simultaneously, but there is following some deficiency: the one, because this device is according to the start and stop of the vacuum degree control vacuum pump of vacuum tank, degree of vacuum be one than more sensitive monitoring target, the sensitivity of monitoring element has been proposed to higher requirement, the sealing of vacuum tank is also had to very high requirement simultaneously, give the Selection and Design of Sealing, the processing of vacuum tank all brings certain difficulty, if vacuum tank has leakage, degree of vacuum will be low, chain reaction is exactly vacuum pump running, accordingly just need to consume electric energy, bring energy waste, frequent start-stop has impact to vacuum pump or motor in addition, the 2nd, the interface of this device and pump is the steam-expelling port of pump, if the suction inlet of pump has approached the bottom of liquid goods, there is a large amount of gas to be inhaled into, these gases are to be introduced into pump, by vacuum pump, taken away afterwards, at this moment the operation of pump is produced and damaged, can not play early warning protective action, therefore diversion before the startup of inapplicable ballast for cruising pump, bilge pump and emergency fire pump, the 3rd, this device needs to arrange " automatic air-dischanging water valve " and prevents that the aqueous reflux in pump from entering vacuum tank, only allow the gas in pump to enter vacuum tank, and the setting of " automatic air-dischanging water valve " this functional element has brought complexity to device.Manufacture and the operating cost of device have been increased.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, and provide that a kind of automaticity is high, reliability is strong, simple in structure, and the front diversion of the startup that is applicable to ballast for cruising pump, bilge pump and emergency fire pump, and can guarantee that centrifugal pump does not have gas and is inhaled into a kind of automatic water diversion device in centrifugal pump in operation process.
The object of the present invention is achieved like this: a kind of centrifugal pump automatic water diversion device, comprise centrifugal pump, knockout drum, liquid level sensor, controller, solenoid directional control valve, pneumatic valve, sparger, one way stop peturn valve and stop valve, it is characterized in that: knockout drum and centrifugal pump, liquid level sensor is connected with the second pneumatic valve, the input of controller is connected with liquid level sensor, output is connected with solenoid directional control valve, solenoid directional control valve and the first pneumatic valve, the second pneumatic valve is connected with stop valve, sparger is connected with the second pneumatic valve, by one way stop peturn valve, be connected with the first pneumatic valve simultaneously.
The lower cavity of described knockout drum is communicated with centrifugal pump intake by pipeline, and upper chamber is communicated with the second pneumatic valve by pipeline, and liquid level sensor is arranged on the middle and upper part of knockout drum.
Described controller is comprised of input interface, comparison circuit, drive circuit and output interface, and the input of comparison circuit is connected with input interface, and the output of comparison circuit is connected with the input of drive circuit, and the output of drive circuit is connected with output interface.
Described comparison circuit comprises hysteresis comparator, low-pass filter, voltage follower and comparator, the input of hysteresis comparator is connected with input interface, the output of hysteresis comparator is connected with the input of low-pass filter, the output of low-pass filter, the output of voltage follower are connected with the input of comparator, and the output of comparator is connected with the input of drive circuit.
Described drive circuit comprises photo coupler and relay, and the input of photo coupler is connected with the output of comparison circuit, and the output of photo coupler is connected with the input of relay, and the output of relay is connected with output interface.
Working procedure of the present invention is: knockout drum is arranged on centrifugal pump intake, liquid level in knockout drum lower than set height time, utilize sparger that the gas of gas-liquid separation tank top is extracted out, form vacuum, make its liquid level increase, thereby remain in centrifugal pump and be full of and pump medium.The start/stop of sparger is to be controlled by the liquid level of knockout drum, when the liquid level in knockout drum reach a certain height, and solenoid directional control valve commutation, halt system air feed, sparger quits work, and diversion process finishes, and starts centrifugal pump, reduction along with liquid level in cabin, suction pressure also decreases, and move closer to the pressure of medium vaporization, after the vaporization of part medium, along with pumping medium, enter into knockout drum and gather gas-liquid separation tank top, along with top air pressure increases, liquid level in knockout drum declines gradually, when liquid level drops to after certain altitude, the testing signal of liquid level sensor enters control circuit, after hysteresis comparator conversion, enter low-pass filter, compare with the setting voltage value from voltage follower again, the low and high level signal of output is isolated amplification rear driving solenoid directional control valve through photo coupler and relay, solenoid directional control valve can commutate according to the testing signal of liquid level sensor, startup system air feed, sparger is started working, gas in knockout drum is extracted out, make its liquid level increase.
Compared with prior art, advantage of the present invention is:
1, improved the automaticity of diversion process.The design of apparatus of the present invention is mainly to have realized diversion function according to the working principle of sparger, but with the difference of prior art maximum be exactly by the design philosophy of design and the dynamo-electric combination of piping, improved the automaticity of diversion process, use combines with solenoid directional control valve by liquid level sensor, as long as the low height of attending the meeting centrifugal pump suction ability being impacted of liquid level in knockout drum, water diversion apparatus will start automatically, to maintain high liquid level in knockout drum, knockout drum medium will be poured in down a chimney in centrifugal pump, avoid centrifugal pump to inhale empty.
2, stable, antijamming capability is strong.The present invention is provided with comparison circuit and drive circuit in controller, the major function of comparison circuit is for level sensing signal is avoided at set point in critical unstable state, utilize the up and descending boundary of hysteresis comparator to comprise desirable set point, increased between a liquid level watershed area, can effectively avoid the critical wild effect of circuit.In drive circuit, the driving force that strengthens low and high level signal is not only played in the setting of photo coupler, but also has effectively played the insulation blocking function of signal circuit and drive circuit, has further strengthened the antijamming capability of circuit.
3, simple in structure, making and operating cost are low.Apparatus of the present invention can play the effect of automatic water-leading, can guarantee that again centrifugal pump can not produce cavitation phenomenons all the time in operation process, and simple in structure, stable, making and maintenance cost are low, are specially adapted to the front diversion of startup of ballast for cruising pump, bilge pump and emergency fire pump.
Accompanying drawing explanation
Fig. 1 is workflow schematic diagram of the present invention;
Fig. 2 is Fig. 1 middle controller circuit diagram.
In figure: centrifugal pump 1, knockout drum 2, liquid level sensor 3, controller 4, controller input interface 41, comparison circuit 42, hysteresis comparator 42a, low-pass filter 42b, voltage follower 42c, comparator 42d, drive circuit 43, photo coupler 43a, relay 43b, controller output interface 44, solenoid directional control valve 5, the first pneumatic valve 6, the second pneumatic valve 7, one way stop peturn valve 8, sparger 9, stop valve 10.
Embodiment
Below in conjunction with embodiment and embodiment, the present invention is further detailed explanation.
Referring to Fig. 1: a kind of centrifugal pump automatic water diversion device, comprise centrifugal pump 1, knockout drum 2, liquid level sensor 3, controller 4, solenoid directional control valve 5, pneumatic valve 6 and 7, one way stop peturn valve 8, sparger 9 and stop valve 10, knockout drum 2 respectively with centrifugal pump 1, liquid level sensor 3 is connected with the second pneumatic valve 7, the input of controller 4 is connected with liquid level sensor 3, output is connected with solenoid directional control valve 5, solenoid directional control valve 5 and the first pneumatic valve 6, the second pneumatic valve 7 is connected with stop valve 10, sparger 9 is connected with the second pneumatic valve 7, by one way stop peturn valve 8, be connected with the first pneumatic valve 6 simultaneously.Specifically the lower cavity of knockout drum 2 is communicated with the suction port of centrifugal pump 1 by pipeline, by pipeline, is communicated with water source simultaneously; The upper chamber of knockout drum 2 is communicated with the A mouth of the second pneumatic valve 7 by pipeline; Liquid level sensor 3 is arranged on the middle and upper part of knockout drum 2.The output of liquid level sensor 3, testing signal is connected with the input interface 41 of controller 4, and the output interface 44 of controller 4 is connected with the input of solenoid directional control valve 5.The A mouth of solenoid directional control valve 5 is connected with the pilot port P of the second pneumatic valve 7 with the first pneumatic valve 6 respectively; The A mouth of the first pneumatic valve 6 is connected with the import of one way stop peturn valve 8, the outlet of one way stop peturn valve 8 is connected with the working gas imported L of sparger 9, the pumped gas import T of sparger 9 is connected with the B mouth of the second pneumatic valve 7, the outlet D of sparger 9 is connected with slop tank piping on ship, and gas is disposed in dirty oil tank.The import of stop valve 10 is connected with source of the gas, and the outlet of stop valve 10 is connected with the B mouth of the first pneumatic valve 6 with the B mouth of solenoid directional control valve 5 respectively.
Apparatus of the present invention are in the operation starting stage, knockout drum 2 and pipeline are empty, according to the testing signal of liquid level sensor 3, when actual liquid level value is lower than the liquid level of setting, solenoid directional control valve 5 is unlocked, source of the gas is divided into two tunnels after entering by stop valve 10, the solenoid directional control valve 5 of leading up to is opened respectively the first pneumatic valve 6 and the second pneumatic valve 7, one tunnel the first pneumatic valve 6 and one way stop peturn valve 8 are as the ejection gas of sparger 9, according to the basic principle of sparger 9, ejection gas drives the gas in knockout drum 2 to spray in the lump through the second pneumatic valve 7 in ejection, thereby make the water level in knockout drum 2 increase gradually, when liquid level reach a certain height, solenoid directional control valve 5 cuts out, source of the gas disconnects, the first pneumatic valve 6 and the second pneumatic valve 7 are closed under the effect of spring force thereupon, sparger 9 quits work, centrifugal pump 1 starts.
Referring to Fig. 2: automatic water diversion device middle controller 4 of the present invention is comprised of input interface 41, comparison circuit 42, drive circuit 43 and output interface 44.The input of comparison circuit 42 is connected with input interface 41, and output is connected with the input of drive circuit 43, and the output of drive circuit 43 is connected with output interface 44.That is: the input of comparison circuit 42 is connected with the output of liquid level sensor 3 by input interface 41, and the output of comparison circuit 42 is connected with the input of drive circuit 43, and the output of drive circuit 43 is connected with the input of solenoid directional control valve 5 by output interface 44.
Comparison circuit 42 is comprised of hysteresis comparator 42a, low-pass filter 42b, voltage follower 42c and comparator 42d, the input of hysteresis comparator 42a is connected with input interface 41, the output of hysteresis comparator 42a is connected with the input of low-pass filter 42b, the output of the output of low-pass filter 42b, voltage follower 42c is connected with the input of comparator 42d, and the output of comparator 42d is connected with the input of drive circuit 43.
Drive circuit 43 is comprised of photo coupler 43a and relay 43b, and the input of photo coupler 43a is connected with the output of comparison circuit 42, and the output of photo coupler 43a is connected with the input of relay 43b, and the output of relay 43b is connected with output interface 44.
Claims (3)
1. a centrifugal pump automatic water diversion device, comprise centrifugal pump (1), knockout drum (2), liquid level sensor (3), controller (4), solenoid directional control valve (5), pneumatic valve (6, 7), one way stop peturn valve (8), sparger (9) and stop valve (10), it is characterized in that: the lower cavity of described knockout drum (2) is communicated with the suction port of centrifugal pump (1) by pipeline, upper chamber is communicated with the second pneumatic valve (7) by pipeline, liquid level sensor (3) is arranged on the middle and upper part of knockout drum (2), the input of controller (4) is connected with liquid level sensor (3), output is connected with solenoid directional control valve (5), solenoid directional control valve (5) and the first pneumatic valve (6), the second pneumatic valve (7) is connected with stop valve (10), sparger (9) is connected with the second pneumatic valve (7), by one way stop peturn valve (8), be connected with the first pneumatic valve (6) simultaneously, described controller (4) is comprised of input interface (41), comparison circuit (42), drive circuit (43) and output interface (44), the input of comparison circuit (42) is connected with input interface (41), the output of comparison circuit (42) is connected with the input of drive circuit (43), and the output of drive circuit (43) is connected with output interface (44).
2. according to the said a kind of centrifugal pump automatic water diversion device of claim 1, it is characterized in that described comparison circuit (42) comprises hysteresis comparator (42a), low-pass filter (42b), voltage follower (42c) and comparator (42d), the input of hysteresis comparator (42a) is connected with input interface (41), the output of hysteresis comparator (42a) is connected with the input of low-pass filter (42b), the output of low-pass filter (42b), the output of voltage follower (42c) is connected with the input of comparator (42d), the output of comparator (42d) is connected with the input of drive circuit (43).
3. according to the said a kind of centrifugal pump automatic water diversion device of claim 1, it is characterized in that described drive circuit (43) comprises photo coupler (43a) and relay (43b), the input of photo coupler (43a) is connected with the output of comparison circuit (42), the output of photo coupler (43a) is connected with the input of relay (43b), and the output of relay (43b) is connected with output interface (44).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210110589.1A CN102644604B (en) | 2012-04-16 | 2012-04-16 | Automatic priming device for centrifugal pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210110589.1A CN102644604B (en) | 2012-04-16 | 2012-04-16 | Automatic priming device for centrifugal pump |
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| CN102644604A CN102644604A (en) | 2012-08-22 |
| CN102644604B true CN102644604B (en) | 2014-08-13 |
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| CN201210110589.1A Active CN102644604B (en) | 2012-04-16 | 2012-04-16 | Automatic priming device for centrifugal pump |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103147993B (en) * | 2013-01-05 | 2015-09-16 | 浙江华球机械制造有限公司 | Be suitable for the dual-purpose fire water pump of complex environment downward moving |
| CN103122862A (en) * | 2013-01-29 | 2013-05-29 | 武汉船用机械有限责任公司 | Liquid leakage monitoring device |
| CN103736227B (en) * | 2013-12-25 | 2016-02-24 | 广州中船黄埔造船有限公司 | A kind of protective voltage type fire-fighting system |
| CN105457203B (en) * | 2015-05-12 | 2018-07-27 | 新兴重工湖北三六一一机械有限公司 | A kind of self-styled liquid suction device of remote control |
| CN106812687B (en) * | 2016-12-27 | 2018-09-18 | 武汉船用机械有限责任公司 | A kind of exhaust system for oil carrier ballast pump |
| CN114033713B (en) * | 2021-11-05 | 2023-10-31 | 扬州大学 | Pump station control method considering start-stop loss based on orthogonal test-dynamic programming combination algorithm |
| CN114566943A (en) * | 2022-02-23 | 2022-05-31 | 睿士医疗科技(浙江)有限公司 | Overvoltage protection system of hardware |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH09137799A (en) * | 1995-11-15 | 1997-05-27 | Tlv Co Ltd | Ejector vacuum pump |
| CN1594887B (en) * | 2004-06-28 | 2010-05-05 | 上海连成（集团）有限公司 | Water self-priming apparatus for water pumps |
| JP2006161791A (en) * | 2004-12-10 | 2006-06-22 | Ebara Corp | Water level control device for plumbing tank |
| CN201513337U (en) * | 2009-09-02 | 2010-06-23 | 上海连成（集团）有限公司 | Novel vacuum automatic water drawing equipment |
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