CN105201794A - Membrane protection system - Google Patents
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- CN105201794A CN105201794A CN201510772241.2A CN201510772241A CN105201794A CN 105201794 A CN105201794 A CN 105201794A CN 201510772241 A CN201510772241 A CN 201510772241A CN 105201794 A CN105201794 A CN 105201794A
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Abstract
The invention belongs to the technical field of membrane protection of a membrane pump and particularly relates to a membrane protection system. The invention provides the membrane protection system which can be operated stably and reliably and has a long service life. The membrane protection system comprises a rubber membrane, wherein the rubber membrane comprises an iron core; and the iron core is connected with the rubber membrane by a guided transverse metal non-magnetic guide rod. The membrane protection system is structurally characterized in that a permanent magnet is mounted on the non-magnetic guide rod; magnetic signal sensors are arranged corresponding to a transverse movement track of the permanent magnet; signal output ports of the magnetic signal sensors are connected with a signal input port of a PLC (Programmable Logic Controller); an oil supplementing and discharging signal output port of the PLC is connected with a control signal input port of an oil supplementing and discharging part of a membrane chamber; and the two magnetic signal sensors are arranged along the transverse direction of the membrane chamber.
Description
Technical field
The invention belongs to diaphragm pump barrier film resist technology field, particularly relate to a kind of barrier film protective system.
Background technique
The pipe conveying equipment that diaphragm pump is commonly used as a kind of industrial field, high with its discharge pressure, feed flow is stablized, the features such as conveying material and piston isolation, be widely used in solid liquid media conveying occasion, wherein diaphragm of rubber is as the vitals of diaphragm pump structure, isolate at conveying material and piston and serve irreplaceable effect, the diaphragm of rubber of diaphragm pump directly determines continuous operation time and the operation rate of diaphragm pump working life, therefore in diaphragm pump manufacture and control technique, the resist technology of barrier film and barrier film damage testing technology are the most important things of diaphragm pump technical development.
Barrier film is mainly quality of rubber materials; be aided with the effect that iron core provides location and guiding, as shown in Figure 2, diaphragm of rubber is installed in diaphragm cavity; play the effect of isolation conveying material and hydraulic oil; make piston and piston cylinder avoid directly contacting with conveying material, protect the life-span of piston, also avoid hydraulic oil to flow into delivery line simultaneously; prevent hydraulic oil pollution conveying material; ensure that the spatter property of pipeline technology, save hydraulic oil relative to oil isolation pump on the other hand, reduce equipment operation cost.
Due to the material of diaphragm of rubber itself, determine diaphragm of rubber itself and can not bear excessive stresses, therefore, diaphragm of rubber itself can not be originated as the power tensor of mass transport, but pressure should be provided in the side of diaphragm of rubber uniformly by hydraulic oil, simultaneously at the opposite side of diaphragm of rubber, by the reaction force of material to barrier film, reach the pressure balance of diaphragm of rubber both sides, make diaphragm of rubber folding and telescopic shape change within the scope of the elastic strain of design permission, thus play the due equipment unit characteristic of diaphragm of rubber, the working life of protection diaphragm of rubber.
The control program of diaphragm pump fuel-flow control system in the market; all by test signal detect probe; detect hydraulic-oil quantity; when detecting that hydraulic-oil quantity is less, carry out automatic repairing action, when detecting that hydraulic-oil quantity is more by hydraulic pipe line; automatic oil extraction action is carried out by hydraulic pipe line; thus realize controlling diaphragm cavity hydraulic pressure oil mass, reach the object of barrier film pressure at both sides balance, and then the running of protection diaphragm of rubber.
This kind of control mode can meet the general device requirement of diaphragm pump running and diaphragm cavity fuel-flow control; but its control mode is simple; executive capability is passive; diaphragm cavity hydraulic pressure oil mass is lacked and estimates means fully; and lack necessary response capability when diaphragm of rubber is damaged; be difficult to the operational security protecting diaphragm pump, cause equipment operation risk to increase, continuous operation time shortens.
Sum up the structure characteristic of diaphragm pump fuel-flow control system in the market, comprehensive its operational effect of analysis, can find out that prior art has following several shortcoming:
1, chamber of septum oil mass detection mode falls behind: diaphragm pump fuel-flow control system in the market, its oil mass detection device is qualitative detection scheme, only by magnetic-type input probe to diaphragm cavity oil mass number judge, the testing result drawn is the digital quantity of 1bool, wherein 0 is that oil mass is deficient, 1 exceeds for oil mass, but can not judge the scarcity amount of chamber of septum oil mass and plussage further, can be found out by this characteristic, old barrier film fuel-flow control system can only carry out qualitative detection to chamber of septum oil mass, and quantitatively cannot detect chamber of septum oil mass.
2, repairing action and oil extraction action oil mass uncontrollable: what the chamber of septum of existing market mended that oil extraction hydraulic system adopts already when making repairing or oil extraction action to chamber of septum is the control strategy quantitatively mending oil extraction, namely by repairing and the oil extraction of set time, chamber of septum oil mass is controlled, this kind of control mode comparatively backwardness, be subject to external action larger, lack the Closed-loop Control Strategy of necessary benefit oil extraction flow detection, cause repairing and oil extraction efficiency lower, such as suppose that the single repairing time is t1, be V1 in the oil mass of single repairing, because the difference of oil compensation pressure and the periodicity of chamber of septum pressure change with manufacturability, single repairing amount V1 must be caused to be not quite similar at every turn, now diaphragm pump can through repairing repeatedly and oil extraction alternating movement, by the difference of repairing amount and oil drain quantity summation by fuel volume adjusting in chamber of septum to the optimum state, visible, mend in oil discharge control system at this, mend oil extraction efficiency lower, the system concussion time is longer, stability difference.Sum up above-mentioned phenomenon, can find out and mend the effect to repairing action and oil extraction action fuel-flow control of oil extraction hydraulic system, but cannot carry out on the basis of quantitatively detection to chamber of septum oil mass at chamber of septum oil quantity detection system, mending oil extraction hydraulic system cannot be controlled single repairing oil mass by closed-loop feedback.
3, chamber of septum benefit oil extraction hydraulic system fault cannot judge: under industrial occasions, bad environments, the complicated factor such as chemical industry sour gas, external impact, mechanical vibration, dust acts on chamber of septum and mends oil extraction hydraulic system, cause chamber of septum to mend oil extraction hydraulic system and occur unpredictable fault, now, because repairing valve or oil extraction valve cannot effectively open or close, will cause the damage of diaphragm of rubber, chamber of septum mends oil extraction hydraulic system fault roughly can be divided into the following aspects:
Repairing valve effectively cannot be opened and cause repairing action cannot to compensate the chamber of septum lacking hydraulic oil, or oil extraction valve cannot effectively close cause oil extraction valve continue excessive oil extraction is carried out to chamber of septum, these two kinds of situations will cause chamber of septum oil mass deficient, pressure reduces, barrier film is in the state that material pressure is greater than chamber of septum oil pressure, cause diaphragm of rubber damaged, simultaneously because chamber of septum oil mass is deficient, in each reciprocation period, the iron core of diaphragm of rubber can clash into chamber of septum rear end, causes mechanical damage.
Oil extraction valve effectively cannot be opened and cause oil extraction action cannot carry out earial drainage to the chamber of septum being in the undue expanded state of hydraulic oil, or repairing valve cannot effectively close cause repairing valve continue excessive repairing is carried out to chamber of septum, these two kinds of situations will cause chamber of septum oil mass too much, pressure increases, barrier film is in the state that material pressure is less than chamber of septum oil pressure, causes diaphragm of rubber damaged.
The totally four kinds of situations in comprehensive above two aspects can be found out; chamber of septum mends the harm that oil extraction hydraulic system fault operates to diaphragm of rubber; but current chamber of septum is mended oil extraction hydraulic system and cannot be differentiated faults itself, be difficult to the object reaching protection diaphragm of rubber and device security.
4, diaphragm of rubber is damaged without detection method: diaphragm of rubber is as the control and scheduling co-design object of diaphragm pump emphasis, it has the important function of isolation material and hydraulic oil, the main conduit line conveying principle of diaphragm pump is does reciprocating elastic motion by diaphragm of rubber in chamber of septum, pressing materials provides Pipeline transport pressure, the breakage of diaphragm of rubber can cause the material buffer action of diaphragm of rubber to decline, material is caused to mix with hydraulic oil, when barrier film does propelling action, because piston does work to hydraulic oil, hydraulic fluid pressure is caused to increase, material is flowed into by the damaged breach of diaphragm of rubber, finally enter conveyance conduit, cause the waste of hydraulic oil and the pollution of pipeline technique, after hydraulic oil enters delivery line, chamber of septum can be caused to mend oil extraction Hydraulic system inspecting deficient to chamber of septum oil mass, and then there is repairing action.When diaphragm of rubber does suction action, because chamber of septum hydraulic fluid pressure reduces, material pressure is higher than chamber of septum hydraulic fluid pressure, cause material to flow into chamber of septum to mix with hydraulic oil, now barrier film is mended oil extraction hydraulic system and will be detected that chamber of septum oil mass is too much, and then there is oil extraction action, now in chamber of septum, hydraulic oil is the mixture of material particles and hydraulic oil, when oil extraction action, material particles will enter drain line along with hydraulic oil, final inflow hydraulic oil container, drain line may be blocked, pollute a large amount of hydraulic oil in hydraulic oil container, simultaneously, containing a large amount of particulate matter in hydraulic oil, chamber of septum piston will be caused to grind, affect and even cause a serious accident life of equipment.As can be seen from the above-mentioned technology fact, cause the main cause of above operation hidden danger to be that current diaphragm pump lacks effective barrier film damage detection device, cannot carry out judging in time and controlling to the pollution of hydraulic oil to the damaged initial stage material of barrier film.
To operate existing existing problems from the above diaphragm pump; currently used diaphragm pump mends oil extraction scheme and barrier film Preservation tactics; the natural elasticity tensile strength of mainly passive dependence diaphragm of rubber; control mode ambiguity is larger; quantitatively cannot carry out detection and the compensation of hydraulic pressure oil mass; not in place to oil-supplementing system faut detection, lack the Fault Control mechanism at barrier film damaged initial stage, easily pollute and the extension damaged.
Summary of the invention
The present invention is exactly for the problems referred to above, provides a kind of stable, reliable and barrier film protective system of long service life.
For achieving the above object, the present invention adopts following technological scheme, the present invention includes diaphragm of rubber, an iron core is comprised in diaphragm of rubber, iron core is connected without magnetic conductance bar with the transverse metal led to diaphragm of rubber, its structure outline is provided with permanent magnet without in magnetic conductance bar, transverse movement track corresponding to described permanent magnet is provided with magnetic-type signal emitter, the signal output port of magnetic-type signal emitter is connected with the signal input port of PLC, and the control signal input port that benefit oil extraction signal output port and the chamber of septum of PLC mend oil extraction part is connected; Described magnetic-type signal emitter be two along diaphragm cavity lateral arrangement.
As another kind of preferred version, diaphragm cavity wall of the present invention has through hole, is provided with signal box in through hole, signal box is connected with diaphragm pump main body by fastening piece; Described magnetic-type sensing is arranged in signal box; In described two magnetic-type signal emitters from close to diaphragm of rubber for gathering diaphragm pump run signal magnetic-type signal emitter, another is for gathering diaphragm pump repairing signal magnetic-type signal emitter; When without in magnetic conductance bar oscillation cycle, during triggering collection diaphragm pump repairing signal magnetic-type signal emitter, PLC sends repairing signal, carries out repairing action to chamber of septum; When without in magnetic conductance bar five oscillation cycles, when not only not had triggering collection diaphragm pump run signal magnetic-type signal emitter but also do not had triggering collection diaphragm pump repairing signal magnetic-type signal emitter, PLC had sent signal and had carried out oil extraction action to chamber of septum.
As another kind of preferred version, diaphragm of rubber of the present invention completes a to-and-fro motion under the effect of hydraulic oil, magnetic-type signal emitter detects magnetic signal, magnetic signal is expressed as the digital quantity parameter that a form is bool in PLC, the induction range of magnetic-type signal emitter has certain width, and its electrical signal high level has regular hour length, according to signal time length, by the calculating of PLC, calculate the deficient situation of chamber of septum oil mass;
Deficient oil mass=piston area [stroke/2-cos (t benefits/2/t total * 360) * stroke /], t mends the time span for collection diaphragm pump repairing signal magnetic-type signal emitter triggers in single diaphragm pump service cycle, and its unit is second; T is always single diaphragm pump stream cycle time length, and its unit is second; T is always drawn by diaphragm pump motor frequency variator institute feedback diaphragm pump motor rotating speed;
When oil mass is normal in chamber of septum, gathers diaphragm pump repairing signal magnetic-type signal emitter and do not trigger, by calculating chamber of septum oil mass collection diaphragm pump run signal magnetic-type signal emitter triggering situation, its formula is shown in following formula:
Wherein L is piston position, and ω is crank rotation angular velocity, and t is the crank rotation time, and r is that bent axle turns radius, and l is length of connecting rod;
The triggered time of diaphragm pump run signal magnetic-type signal emitter is gathered by measuring and calculating, and with the diaphragm pump design standard time, (can there is flexural deformations and stretching in diaphragm of rubber in diaphragm pump reciprocatory movement, when this type variable and amount of tension exceed diaphragm of rubber ability to bear, will serious curtailment diaphragm of rubber working life or cause diaphragm of rubber fail in tension, for this situation, when designing diaphragm cavity, can design for diaphragm of rubber reasonable employment deformation range, this design parameter comprises diaphragm of rubber and is in and is near crankshaft direction range of stretch away from crankshaft direction range of stretch and diaphragm of rubber, the diaphragm pump run well, the motion of its diaphragm of rubber should be carried out between above-mentioned Two coordinate, this length is embodied in crank rotation formula the function of the product being namely time and angular velocity, in above-mentioned coordinate, be equipped with near crankshaft direction and run magnetic-type signal emitter, this sensor marks as the limit of stretch of diaphragm of rubber to crankshaft direction, simultaneously, because this sensor has certain induction width, this induction width is also the function of the product of time and angular velocity in crank rotation formula, i.e. functional expression 2 and formula 3) contrast, judge required repairing/oil extraction oil mass:
The half of diaphragm pump run signal magnetic-type signal emitter rising edge and trailing edge interval time will be gathered
bring in formula 1, proper secondary piston back-end location:
By the half of diaphragm pump design standard time
in substitution formula 1, (can there is flexural deformations and stretching in diaphragm of rubber in diaphragm pump reciprocatory movement can to obtain diaphragm pump design standard position, when this type variable and amount of tension exceed diaphragm of rubber ability to bear, will serious curtailment diaphragm of rubber working life or cause diaphragm of rubber fail in tension, for this situation, when designing diaphragm cavity, can design for diaphragm of rubber reasonable employment deformation range, this design parameter comprises diaphragm of rubber and is in and is near crankshaft direction range of stretch away from crankshaft direction range of stretch and diaphragm of rubber, the diaphragm pump run well, the motion of its diaphragm of rubber should be carried out between above-mentioned Two coordinate, this length is embodied in crank rotation formula the function of the product being namely time and angular velocity, in above-mentioned coordinate, be equipped with near crankshaft direction and run magnetic-type signal emitter, this sensor marks as the limit of stretch of diaphragm of rubber to crankshaft direction, simultaneously, because this sensor has certain induction width, this induction width is also the function of the product of time and angular velocity in crank rotation formula, i.e. functional expression 2 and formula 3):
The oil mass formula of diaphragm of rubber deformation is V=f (L), in above-mentioned
and
bring in oil mass formula, try to achieve
and
two tried to achieve results are subtracted each other, draw the amount of deflection Δ V of current diaphragm room oil mass apart from normal oil level:
When Δ V is positive number, think that current diaphragm room oil mass is more than design oil mass, answer oil extraction, discharging oil mass is Δ V;
When Δ V is negative, think that current diaphragm room oil mass is less than design oil mass, answer repairing, supplementary oil mass is Δ V.
As another kind of preferred version, the present invention, for the data trend collection of Δ V, when chamber of septum oil mass is in minimizing trend and reaches pre-repairing value, even if do not trigger repairing signal, still carries out a small amount of pre-repairing to chamber of septum; When oil mass in chamber of septum is in increase trend and reaches pre-oil extraction value, even if do not reach oil extraction condition, still a small amount of pre-oil extraction is carried out to chamber of septum.
As another kind of preferred version, be provided with pulsed flowmeter in the repairing pipeline of chamber of septum benefit oil extraction part of the present invention, the signal output port of pulsed flowmeter is connected with the testing signal input port of described PLC; Described pulsed flowmeter adopts RFO pulsed flowmeter, when the supplementary hydraulic fluid flow rate of RFO pulsed flowmeter detection reaches described supplementary oil mass Δ V oil mass numerical value, closes Fill valve; The signal output port of described pulsed flowmeter is connected with the testing signal input port of PLC by frequency transmitter.
As another kind of preferred version, PLC of the present invention detects the trouble signal whether having draining valve needed for described oil extraction process, if so, carries out timing to draining valve fault, warning of sounding; When timing time was more than 2 minutes, control diaphragm pump motor and shut down; Described PLC detects the failure reset signal whether having draining valve needed for described oil extraction process, if so, thinks draining valve trouble shooting; Whether detect draining valve to open, if so, detect oil extraction flow and whether be greater than 0.1L/min, if so, draining valve fault treatment terminates;
Described PLC detects the trouble signal whether having described Fill valve, if so, carries out timing to Fill valve fault, warning of sounding; When timing time was more than 2 minutes, control diaphragm pump motor and shut down; Described PLC detects the failure reset signal whether having described Fill valve, if so, thinks Fill valve trouble shooting; Whether detect Fill valve to open, if so, detect repairing flow and whether be greater than 0.1L/min, if so, Fill valve fault treatment terminates;
Described PLC detects the trouble signal whether having the propelling liquid pump of described diaphragm pump, if so, carries out timing to the PF failure of pump of diaphragm pump, warning of sounding; When timing time was more than 2 minutes, control diaphragm pump motor and shut down; Described PLC detects the failure reset signal whether having the propelling liquid pump of described diaphragm pump, if so, thinks that the PF failure of pump of diaphragm pump is removed; Whether whether detect the propelling liquid pump of diaphragm pump to operate, if so, detect Fill valve and open, if not, and PF pressure is less than 0.5MPa continues 2min, sends the trouble signal advancing liquid pump;
The trouble signal of described draining valve obtains by detecting oil extraction process, oil extraction action does not occur, and when producing oil extraction flow, produces the trouble signal of draining valve; The trouble signal of described Fill valve obtains by detecting repairing process, when repairing action does not occur, and when producing repairing flow, produces the trouble signal of Fill valve; The trouble signal of described propelling liquid pump obtains by detecting repairing process, when the running of propelling liquid pump, but during without repairing flow, produces the trouble signal advancing liquid pump.
As another kind of preferred version, whether propelling liquid pump of the present invention runs through following methods is detected: when PF pump motor contactor DI feedback point closes, and the DI module of PLC obtains the signal that this bool amount is 1; Meanwhile, the current transformer that PF pump motor wire assembles detects that this wire has electric current to pass through; When above-mentioned two conditions possess simultaneously, think and advance liquid pump to operate.
As another kind of preferred version, be provided with the diaphragm of rubber breakage probe of the conductive capability of measuring diaphragm intraluminal fluid force feed in diaphragm cavity of the present invention, diaphragm of rubber breakage probe is connected with the testing signal input port of described PLC by probe signal transmitter; The output current of probe signal transmitter is between 4-20mA; increase along with the increase of measured medium conductivity; the corresponding conductivity 0% of output current 4mA of probe signal transmitter; the corresponding conductivity 100% of 20mA; when conductivity is more than 20%; PLC sends warning, and performs cutoff command, controls diaphragm pump motor and shuts down.
Secondly, diaphragm of rubber breakage probe of the present invention adopts the automobile spark plug of the bend part removing spark-plug side electrode; Described diaphragm of rubber breakage probe is arranged on the barrier film pump housing by sleeve, and sleeve is arranged in the through hole on diaphragm cavity wall, and sleeve is connected with the barrier film pump housing by fastening piece.
In addition, probe signal transmitter of the present invention comprises transformer, transformer primary side is connected with 24V power supply, transformer secondary one end by safety fuse cutout FU respectively with resistance R1 one end, resistance R2 one end is connected, the R2 the other end and the damaged one end of popping one's head in of described diaphragm of rubber are connected, diaphragm of rubber breakage probe the other end respectively with resistance R3-4 one end, K switch 4 one end is connected, the K4 the other end respectively with the R3-4 the other end, R3-3 one end, K switch 3 one end is connected, the K3 the other end respectively with K switch 2 one end, the R3-3 the other end, resistance R3-2 one end is connected, the R3-2 the other end respectively with the K2 the other end, K switch 1 one end, resistance R3-1 one end is connected, the R3-1 the other end is connected with isolator one input end, another input end of isolator respectively with the described transformer secondary the other end, ground wire is connected, the K1 the other end is connected with the described R1 the other end, isolator output terminal is connected with the testing signal input port of described PLC.
Beneficial effect of the present invention.
When diaphragm of rubber moves reciprocatingly in chamber of septum, drive metal without the permanent magnet in magnetic conductance bar, periodically near with away from magnetic-type signal emitter, when there being magnetic field near magnetic-type signal emitter, high level signal is passed to PLC by magnetic-type signal emitter, makes PLC accept the signal of guide rod permanent magnet, judges guide rod position further, detect diaphragm cavity state, control to mend oil extraction; Improve operation rate and the device security of diaphragm pump.
Because of magnetic-type signal emitter only can by with magnetic bodies near trigger, relative to elements such as proximity switches, it affects little by other without magnetic metal, to without Magnetic Metal parts without the need to design in specially avoid.
Long service life: because magnetic-type signal emitter is for detect magnetic field by Hall effect, without internal motion mechanical device, therefore relative to contact formula Detecting elements such as dry reed-pipes, it has not easy to wear, the features such as long service life.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.Scope is not only confined to the statement of following content.
Fig. 1 is structural representation of the present invention.
Fig. 2 is diaphragm of rubber structural representation.
Fig. 3 is magnetic-type signal emitter mounting structure schematic diagram of the present invention.
Fig. 4 is the damaged probe installing structure schematic diagram of diaphragm of rubber of the present invention.
Fig. 5 is that chamber of septum of the present invention mends oil extraction control flow chart.
Fig. 6 is draining valve troubleshooting process figure of the present invention.
Fig. 7 is Fill valve troubleshooting process figure of the present invention.
Fig. 8 is PF failure of pump process chart of the present invention.
Fig. 9 is probe signal transmitter circuit schematic diagram of the present invention.
In figure, 1 for gathering diaphragm pump repairing signal magnetic-type signal emitter, 2 for gathering diaphragm pump run signal magnetic-type signal emitter, 3 for being diaphragm pump main body without magnetic conductance bar, 4,5 being diaphragm of rubber, 6 being iron core, 8 being signal box, 9 being spark plug, 10 being plug for sleeve, 11 is 704 glue or epoxy resin, 12,13 being snakeskin cover.
Embodiment
As shown in the figure, the present invention includes diaphragm of rubber 5, an iron core 6 is comprised in diaphragm of rubber 5, iron core 6 is connected without magnetic conductance bar 3 with the transverse metal led to diaphragm of rubber 5, without in magnetic conductance bar 3, permanent magnet is installed, transverse movement track corresponding to described permanent magnet is provided with magnetic-type signal emitter, and the signal output port of magnetic-type signal emitter is connected with the signal input port of PLC, and the control signal input port that benefit oil extraction signal output port and the chamber of septum of PLC mend oil extraction part is connected.
Described magnetic-type signal emitter be two along diaphragm cavity lateral arrangement.Only include two magnetic-type signal emitters in single diaphragm cavity, produce and maintenance cost low, difficulty of processing is low.
Described diaphragm cavity wall has through hole, is provided with signal box 8 in through hole, signal box 8 is connected with diaphragm pump main body 4 by fastening piece; Described magnetic-type sensing is arranged in signal box 8.
The lateral separation of described two magnetic-type signal emitters is 1 ~ 2cm.
Described magnetic-type signal emitter adopts MB60-12GM50-E2 type magnetic-type signal emitter.MB60-12GM50-E2 type magnetic-type signal emitter is low to mechanical design requirements, and it is cylindrical, and self is with standard thread, is convenient to carry out machining and is equipped with.
In described two magnetic-type signal emitters from close to diaphragm of rubber 5 for gathering diaphragm pump run signal magnetic-type signal emitter 2, another is for gathering diaphragm pump repairing signal magnetic-type signal emitter 1; When without in magnetic conductance bar 3 one oscillation cycles, during triggering collection diaphragm pump repairing signal magnetic-type signal emitter 1, PLC sends repairing signal, carries out repairing action to chamber of septum; When without in magnetic conductance bar 3 five oscillation cycles, when not only not had triggering collection diaphragm pump run signal magnetic-type signal emitter 2 but also do not had triggering collection diaphragm pump repairing signal magnetic-type signal emitter 1, PLC had sent signal and had carried out oil extraction action to chamber of septum.Be there is the ability of being carried out repairing by repairing magnetic-type signal emitter, and can by PLC to the logic statistics running magnetic-type signal emitter, finally possesses the oil extraction ability to chamber of septum, without the need to oil extraction magnetic-type signal emitter structure, prevent because Check point too much causes fault because uncertain factor causes and erroneous judgement.
In the diaphragm pump crankshaft operation machinery action of a week, described diaphragm of rubber 5 completes a to-and-fro motion under the effect of hydraulic oil, magnetic-type signal emitter detects magnetic signal, magnetic signal is expressed as the digital quantity parameter that a form is bool in PLC, the induction range of magnetic-type signal emitter has certain width, and its electrical signal high level has regular hour length, according to signal time length, by the calculating of PLC, calculate the deficient situation of chamber of septum oil mass;
Deficient oil mass=piston area [stroke/2-cos (t benefits/2/t total * 360) * stroke /], t mends the time span for collection diaphragm pump repairing signal magnetic-type signal emitter 1 triggers in single diaphragm pump service cycle, and its unit is second; T is always single diaphragm pump stream cycle time length, and its unit is second; T is always drawn by diaphragm pump motor frequency variator institute feedback diaphragm pump motor rotating speed; Wherein piston area and stroke are diaphragm pump design parameter, determined and can consult from drawing when a diaphragm pump manufactures complete.
When oil mass is normal in chamber of septum, gathers diaphragm pump repairing signal magnetic-type signal emitter 1 and do not trigger, by calculating chamber of septum oil mass collection diaphragm pump run signal magnetic-type signal emitter 2 triggering situation, its formula is shown in following formula:
Wherein L is piston position, and ω is crank rotation angular velocity, and t is the crank rotation time, and r is that bent axle turns radius, and l is length of connecting rod;
Gathered the triggered time of diaphragm pump run signal magnetic-type signal emitter 2 by measuring and calculating, and contrast with the diaphragm pump design standard time, judge required repairing/oil extraction oil mass:
The half of diaphragm pump run signal magnetic-type signal emitter 2 rising edge and trailing edge interval time will be gathered
bring in formula 1, proper secondary piston back-end location:
By the half of diaphragm pump design standard time
in substitution formula 1, diaphragm pump design standard position can be obtained:
The oil mass formula of diaphragm of rubber 5 deformation is V=f (L), in above-mentioned
and
bring in oil mass formula, try to achieve
and
two tried to achieve results are subtracted each other, draw the amount of deflection Δ V of current diaphragm room oil mass apart from normal oil level:
When Δ V is positive number, think that current diaphragm room oil mass is more than design oil mass, answer oil extraction, discharging oil mass is Δ V;
When Δ V is negative, think that current diaphragm room oil mass is less than design oil mass, answer repairing, supplementary oil mass is Δ V.
Δ V oil mass is the deficient oil mass in current diaphragm room, and this result can be used for carrying out quantitative repairing to chamber of septum, to shorten the repairing time, increases repairing efficiency.
The present invention, for the data trend collection of Δ V, when chamber of septum oil mass is in minimizing trend and reaches pre-repairing value, even if do not trigger repairing signal, still carries out a small amount of pre-repairing to chamber of septum; When oil mass in chamber of septum is in increase trend and reaches pre-oil extraction value, even if do not reach oil extraction condition, still a small amount of pre-oil extraction is carried out to chamber of septum.Above-mentioned two kinds of control programs can effectively avoid chamber of septum to enter repairing or oil extraction state affects diaphragm pump operational effect, ensure that barrier film is at normal varicose section operation.By detecting chamber of septum hydraulic pressure oil mass and adding up the action of barrier film oil mass replenishment system thus estimate diaphragm cavity state.
Be provided with pulsed flowmeter in the repairing pipeline of described chamber of septum benefit oil extraction part, the signal output port of pulsed flowmeter is connected with the testing signal input port of described PLC.
Described pulsed flowmeter adopts RFO pulsed flowmeter, when the supplementary hydraulic fluid flow rate of RFO pulsed flowmeter detection reaches described supplementary oil mass Δ V oil mass numerical value, closes Fill valve.When fluid flows through RFO pulsed flowmeter, the rotation of magnet rotor is in direct ratio with flow, this causes being with magnetic rotor blade constantly to trigger magnetic field hall effect sensor, just send a voltage pulse signal by magnetic field hall effect sensor, continuous print voltage pulse signal shows as signal frequency to be changed along with the change of flow at every turn.
RFO pulsed flowmeter its have the following advantages:
Accuracy in detection is high: as a kind of positive displacement flowmeter, its flow detection effect does not affect by rate of flow of fluid is constant like other form flowmeters, keeps higher degree of accuracy in the pipeline that therefore often can change at repairing and this flow of drain line and pressure.
Detection sensitivity and resolution high: the liquid capacity between the pivoted arm of the rotor of pulsed flowmeter is very little, and it is high that this just determines its minimum discharge resolution.
Signal form is pulsed: because of the working principle of RFO pulsed flowmeter, and its rotor turns signal is sent with pulse shape by sensor.
As can be seen here, by adding RFO pulsed flowmeter in benefit drain line, the feedback of repairing and oil extraction oil mass can be realized, when supplemented hydraulic fluid flow rate reaches Δ V oil mass numerical value, close repairing valve, realize the closed loop control of repairing and oil extraction oil mass, improve the efficiency of repairing and oil extraction.Meanwhile, because RFO pulsed flowmeter is low to flow stability requirement, overcome the shortcoming of other form flowmeters measuring accuracy difference when instability of flow, improve the precision of detection means.
The signal output port of described pulsed flowmeter is connected with the testing signal input port of PLC by frequency transmitter.
Described frequency transmitter adopts NPFR-C1-SDF326 type frequency transmitter.The NPFR-C1-SDF326 frequency transmitter that You Bei company produces is as a kind of instrumentation that the frequency signal that rotating speed produces can be converted into 4-20mA current signal, and send in PLC by becoming the numerical value sending generation, show that chamber of septum mends oil extraction flow value through data processing, final guidance mends oil extraction single motion.
Described PLC detects the trouble signal whether having draining valve needed for described oil extraction process, if so, carries out timing to draining valve fault, warning of sounding; When timing time was more than 2 minutes, control diaphragm pump motor and shut down; Described PLC detects the failure reset signal whether having draining valve needed for described oil extraction process, if so, thinks draining valve trouble shooting; Whether detect draining valve to open, if so, detect oil extraction flow and whether be greater than 0.1L/min, if so, draining valve fault treatment terminates;
Described PLC detects the trouble signal whether having described Fill valve, if so, carries out timing to Fill valve fault, warning of sounding; When timing time was more than 2 minutes, control diaphragm pump motor and shut down; Described PLC detects the failure reset signal whether having described Fill valve, if so, thinks Fill valve trouble shooting; Whether detect Fill valve to open, if so, detect repairing flow and whether be greater than 0.1L/min, if so, Fill valve fault treatment terminates;
Described PLC detects the trouble signal whether having the propelling liquid pump of described diaphragm pump, if so, carries out timing to the PF failure of pump of diaphragm pump, warning of sounding; When timing time was more than 2 minutes, control diaphragm pump motor and shut down; Described PLC detects the failure reset signal whether having the propelling liquid pump of described diaphragm pump, if so, thinks that the PF failure of pump of diaphragm pump is removed; Whether whether detect the propelling liquid pump of diaphragm pump to operate, if so, detect Fill valve and open, if not, and PF pressure is less than 0.5MPa continues 2min, sends the trouble signal advancing liquid pump.
The trouble signal of described draining valve obtains by detecting oil extraction process, oil extraction action does not occur, and when producing oil extraction flow, produces the trouble signal of draining valve; The trouble signal of described Fill valve obtains by detecting repairing process, when repairing action does not occur, and when producing repairing flow, produces the trouble signal of Fill valve; The trouble signal of described propelling liquid pump obtains by detecting repairing process, when the running of propelling liquid pump, but during without repairing flow, produces the trouble signal advancing liquid pump.
Whether described propelling liquid pump runs through following methods is detected: when PF pump motor contactor DI feedback point closes, and the DI module of PLC obtains the signal that this bool amount is 1; Meanwhile, the current transformer that PF pump motor wire assembles detects that this wire has electric current to pass through; When above-mentioned two conditions possess simultaneously, think and advance liquid pump to operate.
Be provided with the diaphragm of rubber 5 breakage probe of the conductive capability of measuring diaphragm intraluminal fluid force feed in described diaphragm cavity, diaphragm of rubber 5 breakage probe is connected with the testing signal input port of described PLC by probe signal transmitter; The output current of probe signal transmitter is between 4-20mA; increase along with the increase of measured medium conductivity; the corresponding conductivity 0% of output current 4mA of probe signal transmitter; the corresponding conductivity 100% of 20mA; when conductivity is more than 20%; PLC sends warning, and performs cutoff command, controls diaphragm pump motor and shuts down.By detecting chamber of septum hydraulic pressure oil mass and add up the action of barrier film oil mass replenishment system thus estimating barrier film breakage and diaphragm cavity state; and by exploration type detection device, oil condition in diaphragm cavity is detected; realize protection and the emergency alarm measure of barrier film breakage
The Timeliness coverage of the breakage of diaphragm of rubber 5 is for the extension important in inhibiting of fault, while diaphragm of rubber 5 breakage, inevitable mixing along with conveying material and hydraulic oil, wherein the conductive capability of institute's conveying material and hydraulic oil conductive capability have very large difference, judge whether be mixed with material in hydraulic oil according to the conductive capability of hydraulic oil in diaphragm cavity, determine that whether diaphragm of rubber 5 is damaged further.
Described diaphragm of rubber 5 breakage probe adopts the automobile spark plug 9 of the bend part removing spark-plug side electrode.The bend part of spark-plug side electrode is cut down, can prevent particulate matter in material from blocking the gap in spark plug 9 between electrocardiograph and lateral electrode.
Automobile spark plug 9 is adopted to possess following advantage as diaphragm of rubber 5 breakage probe:
1. spark plug is drawn materials extensively, in liberal supply, can obtain large content of starting materials easily.
2. spark plug is withstand voltage, decay resistance good, and can be applicable to facility environment in diaphragm cavity, component life is longer.
3. parameter measured by spark plug is resistance parameter, and its signal is easy to process.
Comprehensive above advantage, can select the making material that the inner spark plug not comprising resistance is popped one's head in as diaphragm of rubber 5 damage testing.
Described diaphragm of rubber 5 breakage probe is arranged on the barrier film pump housing by sleeve 10, and sleeve 10 is arranged in the through hole on diaphragm cavity wall, and sleeve 10 is connected with the barrier film pump housing by fastening piece.Be convenient to diaphragm of rubber 5 breakage probe to be installed on diaphragm cavity by sleeve 10, make diaphragm cavity internal conductance signal transmission outside to diaphragm cavity.
Arrange sleeve 10 to have the following advantages:
1. the voltage endurance capability of sleeve 10 can bear the hyperbaric environment in diaphragm cavity.
2. sleeve 10 is easy to handling, when tip damage, sleeve 10 can be disassembled, and continues to use, save maintenance cost after changing probe.
Described probe signal transmitter comprises transformer, transformer primary side is connected with 24V power supply, transformer secondary one end by safety fuse cutout FU respectively with resistance R1 one end, resistance R2 one end is connected, the R2 the other end and the damaged one end of popping one's head in of described diaphragm of rubber 5 are connected, diaphragm of rubber 5 breakage probe the other end respectively with resistance R3-4 one end, K switch 4 one end is connected, the K4 the other end respectively with the R3-4 the other end, R3-3 one end, K switch 3 one end is connected, the K3 the other end respectively with K switch 2 one end, the R3-3 the other end, resistance R3-2 one end is connected, the R3-2 the other end respectively with the K2 the other end, K switch 1 one end, resistance R3-1 one end is connected, the R3-1 the other end is connected with isolator one input end, another input end of isolator respectively with the described transformer secondary the other end, ground wire is connected, the K1 the other end is connected with the described R1 the other end, isolator output terminal is connected with the testing signal input port of described PLC.
Described PLC can adopt Siemens 6ES7331-7KF02-0AB0 type PLC.Resistance signal is converted into current signal by probe signal transmitter, delivers to PLC, can be calculated the specific resistance of hydraulic oil by PLC computing.
As shown in Figure 9, the minimum current that resistance R1 wherein act as testing circuit when ensureing that tested material resistance R is infinity is not less than 4mA, R2 act as testing circuit when ensureing that tested material resistance R is 0 maximum current be no more than 20mA, R3_1, R3_2, R3_3, R3_4 act as the resistance being adjusted whole circuit by the closed of K1, K2, K3, K4 and unlatching, thus adjustment detects numerical value, describe and circuit diagram according to above-mentioned, following formula can be drawn:
24V/R1≥4mA
24VR1R2/(R1+R2)≤20mA
According to above formula, solve R1≤6k Ω, type selecting is 5.9k Ω, obtains R2 >=1.5k Ω according to the large I of R1, and type selecting is 1.54k Ω.
24VDC insulating power supply and active isolator:
As can be seen from diaphragm of rubber 5 damage testing probe sleeve 10 structure, the centre electrode of the just very spark plug 9 of diaphragm of rubber 5 damage testing probe, negative pole is the lateral electrode of spark plug 9, and wherein spark plug 9 lateral electrode is because of its design and install factor and diaphragm pump shell equipotential.This kind of Placement has the advantage of easy-to-connect, but also bury potential safety hazard, when carrying out welding maintenance to diaphragm pump shell, if electric welding machine ground wire Rig up error, welding current then can be caused to flow into diaphragm of rubber 5 damage testing loop, because of in loop except resistance R1 and R2, need to be powered by 24VDC power supply, therefore, electric welding machine electric current likely causes 24VDC power supply to burn, for protection 24VDC power supply, fusing protective tube should be sealed in diaphragm of rubber 5 damage testing loop, simultaneously, detecting power supply should adopt insulating power supply to be separately loop power supply, its voltage is 24VDC, maximum current is 20mA.
Meanwhile, because of the employing of insulating power supply, PLC and diaphragm of rubber 5 damage testing loop current potential are also unequal, therefore, isolator of having chance with should be adopted to isolate 4-20mA signal, its signal can be accepted by PLC, and can play the effect of protection PLCAI module.
Can find out in figure, the power acquisition of active isolator be that system 24VDC power supply is powered, what diaphragm of rubber 5 damage testing ring current adopted is that isolation 24VDC power supply is powered, ensure that the Security of system, simultaneously, fusing protective tube is connected serially to measure loop, also prevent super-high-current and enters into measure loop.
In actual use, because of industrial busbar voltage and the 220VAC of non-fully standard, therefore, 24VDC power supply produce voltage also and the 24VDC normal voltage of non-fully standard, the current signal that transmits of this kind of situation can with actual institute's measuring resistance value deviation to some extent, in order to balance this deviation, less resistive of should connecting in diaphragm of rubber 5 damage testing loop, and can be selected by switch.
R3 in Fig. 9 can share a part of supply voltage, is cut or cuts out circuit and can play the effect reducing testing circuit voltage, suitably increase multiple resistance, can refinement regulation stall, plays fine setting effect.
Be understandable that, above about specific descriptions of the present invention, the technological scheme described by the embodiment of the present invention is only not limited to for illustration of the present invention, those of ordinary skill in the art is to be understood that, still can modify to the present invention or equivalent replacement, to reach identical technique effect; Needs are used, all within protection scope of the present invention as long as meet.
Claims (10)
1. a barrier film protective system, comprise diaphragm of rubber, an iron core is comprised in diaphragm of rubber, iron core is connected without magnetic conductance bar with the transverse metal led to diaphragm of rubber, it is characterized in that, without in magnetic conductance bar, permanent magnet is installed, transverse movement track corresponding to described permanent magnet is provided with magnetic-type signal emitter, the signal output port of magnetic-type signal emitter is connected with the signal input port of PLC, and the control signal input port that benefit oil extraction signal output port and the chamber of septum of PLC mend oil extraction part is connected; Described magnetic-type signal emitter be two along diaphragm cavity lateral arrangement.
2. a kind of barrier film protective system according to claim 1, it is characterized in that described diaphragm cavity wall has through hole, be provided with signal box in through hole, signal box is connected with diaphragm pump main body by fastening piece; Described magnetic-type sensing is arranged in signal box; In described two magnetic-type signal emitters from close to diaphragm of rubber for gathering diaphragm pump run signal magnetic-type signal emitter, another is for gathering diaphragm pump repairing signal magnetic-type signal emitter; When without in magnetic conductance bar oscillation cycle, during triggering collection diaphragm pump repairing signal magnetic-type signal emitter, PLC sends repairing signal, carries out repairing action to chamber of septum; When without in magnetic conductance bar five oscillation cycles, when not only not had triggering collection diaphragm pump run signal magnetic-type signal emitter but also do not had triggering collection diaphragm pump repairing signal magnetic-type signal emitter, PLC had sent signal and had carried out oil extraction action to chamber of septum.
3. a kind of barrier film protective system according to claim 1, it is characterized in that described diaphragm of rubber completes a to-and-fro motion under the effect of hydraulic oil, magnetic-type signal emitter detects magnetic signal, magnetic signal is expressed as the digital quantity parameter that a form is bool in PLC, the induction range of magnetic-type signal emitter has certain width, and its electrical signal high level has regular hour length, according to signal time length, by the calculating of PLC, calculate the deficient situation of chamber of septum oil mass;
Deficient oil mass=piston area [stroke/2-cos (t benefits/2/t total * 360) * stroke /], t mends the time span for collection diaphragm pump repairing signal magnetic-type signal emitter triggers in single diaphragm pump service cycle, and its unit is second; T is always single diaphragm pump stream cycle time length, and its unit is second; T is always drawn by diaphragm pump motor frequency variator institute feedback diaphragm pump motor rotating speed;
When oil mass is normal in chamber of septum, gathers diaphragm pump repairing signal magnetic-type signal emitter and do not trigger, by calculating chamber of septum oil mass collection diaphragm pump run signal magnetic-type signal emitter triggering situation, its formula is shown in following formula:
Wherein L is piston position, and ω is crank rotation angular velocity, and t is the crank rotation time, and r is that bent axle turns radius, and l is length of connecting rod;
Gathered the triggered time of diaphragm pump run signal magnetic-type signal emitter by measuring and calculating, and contrast with the diaphragm pump design standard time, judge required repairing/oil extraction oil mass:
The half of diaphragm pump run signal magnetic-type signal emitter rising edge and trailing edge interval time will be gathered
bring in formula 1, proper secondary piston back-end location:
By the half of diaphragm pump design standard time
in substitution formula 1, diaphragm pump design standard position can be obtained:
The oil mass formula of diaphragm of rubber deformation is V=f (L), in above-mentioned
and
bring in oil mass formula, try to achieve
and
two tried to achieve results are subtracted each other, draw the amount of deflection Δ V of current diaphragm room oil mass apart from normal oil level:
When Δ V is positive number, think that current diaphragm room oil mass is more than design oil mass, answer oil extraction, discharging oil mass is Δ V;
When Δ V is negative, think that current diaphragm room oil mass is less than design oil mass, answer repairing, supplementary oil mass is Δ V.
4. a kind of barrier film protective system according to claim 3, is characterized in that the data trend collection for Δ V, when chamber of septum oil mass is in minimizing trend and reaches pre-repairing value, even if do not trigger repairing signal, still carries out a small amount of pre-repairing to chamber of septum; When oil mass in chamber of septum is in increase trend and reaches pre-oil extraction value, even if do not reach oil extraction condition, still a small amount of pre-oil extraction is carried out to chamber of septum.
5. a kind of barrier film protective system according to claim 3, it is characterized in that being provided with pulsed flowmeter in the repairing pipeline that described chamber of septum mends oil extraction part, the signal output port of pulsed flowmeter is connected with the testing signal input port of described PLC; Described pulsed flowmeter adopts RFO pulsed flowmeter, when the supplementary hydraulic fluid flow rate of RFO pulsed flowmeter detection reaches described supplementary oil mass Δ V oil mass numerical value, closes Fill valve; The signal output port of described pulsed flowmeter is connected with the testing signal input port of PLC by frequency transmitter.
6. a kind of barrier film protective system according to claim 5, is characterized in that described PLC detects the trouble signal whether having draining valve needed for described oil extraction process, if so, carries out timing to draining valve fault, warning of sounding; When timing time was more than 2 minutes, control diaphragm pump motor and shut down; Described PLC detects the failure reset signal whether having draining valve needed for described oil extraction process, if so, thinks draining valve trouble shooting; Whether detect draining valve to open, if so, detect oil extraction flow and whether be greater than 0.1L/min, if so, draining valve fault treatment terminates;
Described PLC detects the trouble signal whether having described Fill valve, if so, carries out timing to Fill valve fault, warning of sounding; When timing time was more than 2 minutes, control diaphragm pump motor and shut down; Described PLC detects the failure reset signal whether having described Fill valve, if so, thinks Fill valve trouble shooting; Whether detect Fill valve to open, if so, detect repairing flow and whether be greater than 0.1L/min, if so, Fill valve fault treatment terminates;
Described PLC detects the trouble signal whether having the propelling liquid pump of described diaphragm pump, if so, carries out timing to the PF failure of pump of diaphragm pump, warning of sounding; When timing time was more than 2 minutes, control diaphragm pump motor and shut down; Described PLC detects the failure reset signal whether having the propelling liquid pump of described diaphragm pump, if so, thinks that the PF failure of pump of diaphragm pump is removed; Whether whether detect the propelling liquid pump of diaphragm pump to operate, if so, detect Fill valve and open, if not, and PF pressure is less than 0.5MPa continues 2min, sends the trouble signal advancing liquid pump;
The trouble signal of described draining valve obtains by detecting oil extraction process, oil extraction action does not occur, and when producing oil extraction flow, produces the trouble signal of draining valve; The trouble signal of described Fill valve obtains by detecting repairing process, when repairing action does not occur, and when producing repairing flow, produces the trouble signal of Fill valve; The trouble signal of described propelling liquid pump obtains by detecting repairing process, when the running of propelling liquid pump, but during without repairing flow, produces the trouble signal advancing liquid pump.
7. a kind of barrier film protective system according to claim 6, is characterized in that whether described propelling liquid pump runs through following methods and detect: when PF pump motor contactor DI feedback point closes, and the DI module of PLC obtains the signal that this bool amount is 1; Meanwhile, the current transformer that PF pump motor wire assembles detects that this wire has electric current to pass through; When above-mentioned two conditions possess simultaneously, think and advance liquid pump to operate.
8. a kind of barrier film protective system according to claim 1, it is characterized in that the diaphragm of rubber breakage probe of the conductive capability being provided with measuring diaphragm intraluminal fluid force feed in described diaphragm cavity, diaphragm of rubber breakage probe is connected with the testing signal input port of described PLC by probe signal transmitter; The output current of probe signal transmitter is between 4-20mA; increase along with the increase of measured medium conductivity; the corresponding conductivity 0% of output current 4mA of probe signal transmitter; the corresponding conductivity 100% of 20mA; when conductivity is more than 20%; PLC sends warning, and performs cutoff command, controls diaphragm pump motor and shuts down.
9. a kind of barrier film protective system according to claim 8, is characterized in that described diaphragm of rubber breakage probe adopts the automobile spark plug of the bend part removing spark-plug side electrode; Described diaphragm of rubber breakage probe is arranged on the barrier film pump housing by sleeve, and sleeve is arranged in the through hole on diaphragm cavity wall, and sleeve is connected with the barrier film pump housing by fastening piece.
10. a kind of barrier film protective system according to claim 8, it is characterized in that described probe signal transmitter comprises transformer, transformer primary side is connected with 24V power supply, transformer secondary one end by safety fuse cutout FU respectively with resistance R1 one end, resistance R2 one end is connected, the R2 the other end and the damaged one end of popping one's head in of described diaphragm of rubber are connected, diaphragm of rubber breakage probe the other end respectively with resistance R3-4 one end, K switch 4 one end is connected, the K4 the other end respectively with the R3-4 the other end, R3-3 one end, K switch 3 one end is connected, the K3 the other end respectively with K switch 2 one end, the R3-3 the other end, resistance R3-2 one end is connected, the R3-2 the other end respectively with the K2 the other end, K switch 1 one end, resistance R3-1 one end is connected, the R3-1 the other end is connected with isolator one input end, another input end of isolator respectively with the described transformer secondary the other end, ground wire is connected, the K1 the other end is connected with the described R1 the other end, isolator output terminal is connected with the testing signal input port of described PLC.
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| CN109139434A (en) * | 2018-10-25 | 2019-01-04 | 重庆水泵厂有限责任公司 | The non-equipotential flexural deformations control method of diaphragm pump diaphragm |
| CN112747806A (en) * | 2020-12-22 | 2021-05-04 | 河北道成电子科技有限公司 | Water meter capable of remotely calibrating flow based on Internet of things |
| CN115076088A (en) * | 2022-06-30 | 2022-09-20 | 重庆水泵厂有限责任公司 | Detection structure for detecting diaphragm displacement of diaphragm pump and diaphragm breakage detection method |
| CN115163461A (en) * | 2022-08-26 | 2022-10-11 | 重庆水泵厂有限责任公司 | Diaphragm pump and accurate oil supply and discharge control method for diaphragm pump |
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