A kind of mechanical seal leakage flow monitoring methodTechnical field
It is a kind of machine specifically the present invention relates to fields such as flow measurement technology, mechanical sealing leakage amount monitoring technologyTool sealing leak flow monitoring method.
Background technology
Mechanical seal is a kind of gland seal device of rotating machinery, is widely used in centrifugal pump, centrifuge, reactor and compressionThe equipment such as machine.One of key components and parts as corollary equipment, the running status of mechanical seal directly affects the normal fortune of equipmentOK.Mechanical sealing leakage amount is to judge whether mechanical seal qualified and the whether normal key index of running status.InMagnificent people's republic's machinery industry standard《Mechanical sealing technology condition》Required in Part I (JB/T 4127.1-2013), whenWhen sealed medium is liquid, when axle (or axle sleeve) external diameter is more than 50mm, average leaked amount should be not more than 5ml/h；Axle (or axleSet) external diameter be less than 50mm when, average leaked amount should be not more than 3ml/h.Because the leakage rate of mechanical seal is very small, lead to simultaneouslyThe leakage liquid for crossing the outflow of mechanical seal leakage collecting tank is the measurement lower limit of discontinuous flow, far smaller than conventional instrument,Therefore, typically all the fluid of leakage is collected by measuring cup or graduated cylinder, leakage stream is then calculated according to acquisition timeAmount.But there is obvious shortcoming in this method：1) time of measuring is long, and complex operation is carried out on time, it is necessary to put into special personnelInspection is simultaneously recorded and cleared up；For poisonous, active fluid, there is damage risk to personnel's body, if leakage streamEvaporation can also cause obvious measurement error when temperature is higher；2), must when there is leakage stream increase caused by axle envelope damageIt must wait until that patrol officer can just carry out shutdown maintenance after finding.For some important systems, it may damage and draw because of axle envelopeSerious device damage even accident is played, causes heavy economic losses, personnel's injury and environmental disaster；3) be not suitable for personnel withoutWith active region in the close severe application scenario of method, such as nuclear power plant, personnel can not in time check in measuring cup and collectLeakage flow, cause axle envelope damage after can not notify in time operation and attendant.Therefore, mechanical seal leakage flow is enteredRow measures particularly significant in real time.
The content of the invention
It is an object of the invention to a kind of mechanical seal leakage flow monitoring method, mechanical sealing leakage amount can be carried outThe method monitored in real time, is especially monitored in real time to very small and discrete leakage rate.
The present invention is achieved through the following technical solutions：A kind of mechanical seal leakage flow monitoring method, utilizes mechanical sealLeakage flow measuring system, Fluid modulation formation drop is carried out by mechanical seal leakage flow, and carries out real-time counting to drop,The flow of mechanical seal leakage is obtained in real time.
Further is that the present invention is better achieved, especially using following set-up modes：Described mechanical seal leakage streamQuantity monitoring method is mainly included the following steps that：
1) leakage flow damping is slowed down：By resistance of the leakage stream with initial velocity by mechanical seal leakage Flow Measuring SystemBuddhist nun's capillary is slowed down；
2) drop is modulated：Leakage is flowed through after the damping capillary deceleration of mechanical seal leakage Flow Measuring System, from dampingInfiltrate, be gathered in the drop buncher of mechanical seal leakage Flow Measuring System in capillary, formed one it is completeDrop；
3) drop is recognized：Complete drop will depart from out of drop buncher and fall into mechanical seal leakage flow measurement systemThe measurement chamber of system, passes through the droplet counting system formation pulse signal of mechanical seal leakage Flow Measuring System；
4) pulse signal is handled：Pulse signal will input the process circuit of mechanical seal leakage Flow Measuring System, processingThe quantity of drop in the circuit counting unit interval.
Further is that the present invention is better achieved, especially using following set-up modes：The step 3) pass through drop meterNumber system forms pulse signal：
3.1) when no drop is by measuring chamber, the infrared ray that the RF transmitter in droplet counting system is sent willReceived by the infrared receiver sensor in droplet counting system, infrared receiver sensor will be turned on；
3.2) when there is drop by measuring chamber, the drop passed through will occur that of short duration to shelter from infrared transmitter directive redOutside line receives the infrared ray of sensor, and the open circuit of pulse feature occurs in infrared receiver sensor, forms pulse signal.
Further is that the present invention is better achieved, especially using following set-up modes：Carrying out the step 1) beforeAlso include collecting mechanical sealing leak flow：By connecting tube, mechanical seal leakage flow is incorporated into mechanical seal leakage streamIn the leakage stream collection funnel of system for measuring quantity.
Further is that the present invention is better achieved, especially using following set-up modes：Also include step 5) Calibration dropletsModulator output droplet size Vr：
In laboratory conditions, demarcated with sealing leak stream identical fluid, including step in detail below：
5.1) provide input flow rate for leakage device with dropper, adjust input flow rate and stably；
5.2) collect the drop of measurement chamber outflow with measuring cup and measure its volume Vm；
5.3) Statistical Volume VmThe corresponding droplet counting N of liquid；
5.4) formula is usedCalculate with reference to droplet size Vr。
Further is that the present invention is better achieved, especially using following set-up modes：Also include step 6) leakage flowCalculate：The time span T of droplet counting is determined according to the response time, and the droplet counting total amount being set in time span T isNT, leakage volume flow is Q, then passes through calculation formulaCalculate leakage volume flow Q value.
Further is that the present invention is better achieved, especially using following set-up modes：Also include step 7) flow outputAnd alarm：
7.1) process circuit of mechanical seal leakage Flow Measuring System will leak out the value of volume flow Q according to predetermined amountJourney scope is converted into the electric signal output of standard；
7.2) value that process circuit will leak out volume flow Q is compared with the alarm threshold value set, according to comparative resultThe contact signal of response is exported, is alarmed.
Further is that the present invention is better achieved, especially using following set-up modes：The mechanical seal leakage flowThe droplet counting system that measuring system is provided with fluence modulators and is connected with fluence modulators, the fluence modulators includeLeakage stream collection funnel, damping capillary and drop buncher, the leakage stream collection funnel connect liquid by damping capillaryBuncher is dripped, and drop buncher is connected with droplet counting system.
Further is that the present invention is better achieved, especially using following set-up modes：The droplet counting system includesRF transmitter, infrared receiver sensor, measurement chamber and process circuit, the drop buncher are arranged on measurement chamber,RF transmitter and infrared receiver sensor are oppositely arranged on the both sides of measurement chamber, and process circuit is distinguished by transmission lineIt is connected with RF transmitter and infrared receiver sensor.
Further is that the present invention is better achieved, especially using following set-up modes：The RF transmitter and redOutside line receives the both sides that sensor is symmetrically arranged on measurement chamber.
The present invention compared with prior art, with advantages below and beneficial effect：
(1) method that the present invention can in real time be monitored to mechanical sealing leakage amount, especially to very small sumDiscrete leakage rate is monitored in real time.
(2) present invention is based on Fluid modulation and photoelectric sense technology, the non-company that will be flowed out in mechanical seal leakage collecting tankAfterflow body is modulated to the drop of volume fixation, and by droplet counting system counts drop amount, process circuit according to droplet counting,Droplet size and time segment length obtain the average leaked flow in the period.
(3) present invention is by carrying out the drop of Fluid modulation formation rule to mechanical seal leakage flow, and passes through dropNumber system carries out flow measurement, and the flow of sealing leak, and the real-time monitor value and phase of output flow can be obtained in real timeThe alarm signal answered, can provide Real-time Monitoring Data, to being set using mechanical seal for mechanical seal experiment, operation, maintenanceThe safety and economic operation of standby and system provides important leverage, significantly reduces operation maintenance personnel's burden, reduces because sealingNegative consequence caused by failure of apparatus.
Brief description of the drawings
Fig. 1 is mechanical seal leakage Flow Measuring System figure of the present invention.
Wherein, 1- leakage streams collection funnel, 2- damping capillaries, 3- drop bunchers, 4- RF transmitters, 5- is infraredLine receives sensor, 6- measurement chambers, 7- process circuits, 8- transmission lines.
Embodiment
The present invention is described in further detail with reference to embodiment, but the implementation of the present invention is not limited to this.
Embodiment 1：
The present invention proposes a kind of mechanical seal leakage flow monitoring method, mechanical sealing leakage amount can be carried out real-timeThe method of monitoring, is especially monitored in real time to very small and discrete leakage rate, as shown in figure 1, especially usingFollowing set-up modes：Using mechanical seal leakage Flow Measuring System, mechanical seal leakage flow progress Fluid modulation is formedDrop, and real-time counting is carried out to drop, the flow of mechanical seal leakage is obtained in real time.
Embodiment 2：
The present embodiment is further optimized on the basis of above-described embodiment, further for the present invention is better achieved,As shown in figure 1, especially using following set-up modes：Described mechanical seal leakage flow monitoring method mainly includes following stepSuddenly：
1) leakage flow damping is slowed down：By resistance of the leakage stream with initial velocity by mechanical seal leakage Flow Measuring SystemBuddhist nun's capillary 2 is slowed down, the initial velocity for eliminating incident fluid；
2) drop is modulated：Leakage is flowed through after the deceleration of damping capillary 2 of mechanical seal leakage Flow Measuring System, from dampingInfiltrate, be gathered in the drop buncher 3 of mechanical seal leakage Flow Measuring System in capillary 2, and constantly increase,Until forming a complete drop；
3) drop is recognized：Complete drop will depart from out of drop buncher 3 and vertical fall into mechanical seal leakage streamThe measurement chamber 6 of system for measuring quantity, passes through the droplet counting system formation pulse signal of mechanical seal leakage Flow Measuring System；ByThere is identical volume substantially when same liquid is disengaged from drop buncher 3；
4) pulse signal is handled：Pulse signal will input the process circuit 7 of mechanical seal leakage Flow Measuring System, processingThe quantity of drop in the unit of account time of circuit 7.
Embodiment 3：
The present embodiment is further optimized on the basis of any of the above-described embodiment, and further is that this hair is better achievedIt is bright, as shown in figure 1, especially using following set-up modes：The step 3) it is specific by droplet counting system formation pulse signalFor：
3.1) when no drop is by measuring chamber 6, the infrared ray that the RF transmitter 4 in droplet counting system is sentIt will be received by the infrared receiver sensor 5 in droplet counting system, infrared receiver sensor 5 will be turned on；
3.2) when there is drop by measuring chamber 6, the drop passed through, which will occur, of short duration shelters from the directive of infrared transmitter 4There is the open circuit of pulse feature in the infrared ray of infrared receiver sensor 5, infrared receiver sensor 5, forms pulse signal.
Embodiment 4：
The present embodiment is further optimized on the basis of any of the above-described embodiment, and further is that this hair is better achievedIt is bright, as shown in figure 1, especially using following set-up modes：Carrying out the step 1) also include collecting mechanical sealing leak beforeFlow：By connecting tube, the leakage stream that mechanical seal leakage flow is incorporated into mechanical seal leakage Flow Measuring System is collectedIn funnel 1.
Embodiment 5：
The present embodiment is further optimized on the basis of any of the above-described embodiment, and further is that this hair is better achievedIt is bright, as shown in figure 1, especially using following set-up modes：Also include step 5) Calibration droplets modulator output droplet size Vr：
In laboratory conditions, demarcated with sealing leak stream identical fluid, including step in detail below：
5.1) provide input flow rate for leakage device with dropper, adjust input flow rate and stably；
5.2) collect the drop of the measurement outflow of chamber 6 with measuring cup and measure its volume Vm；
5.3) Statistical Volume VmThe corresponding droplet counting N of liquid；
5.4) formula is usedCalculate with reference to droplet size Vr。
Embodiment 6：
The present embodiment is further optimized on the basis of any of the above-described embodiment, and further is that this hair is better achievedIt is bright, as shown in figure 1, especially using following set-up modes：Also include step 6) leakage flow calculating：Liquid is determined according to the response timeThe time span T counted is dripped, and the droplet counting total amount being set in time span T is NT, leakage volume flow is Q, then leads toCross calculation formulaLeakage volume flow Q value is calculated, when specifically used, for mechanical seal leakage flowMonitoring, time span T generally could be arranged to 1 minute.
Embodiment 7：
The present embodiment is further optimized on the basis of any of the above-described embodiment, and further is that this hair is better achievedIt is bright, as shown in figure 1, especially using following set-up modes：Also include step 7) flow output and alarm：
7.1) process circuit 7 of mechanical seal leakage Flow Measuring System will leak out the value of volume flow Q according to predeterminedRange ability is converted into the electric signal output of standard；
7.2) value that process circuit 7 will leak out volume flow Q is compared with the alarm threshold value set, according to comparative resultThe contact signal of response is exported, is alarmed.
Embodiment 8：
The present embodiment is further optimized on the basis of any of the above-described embodiment, and further is that this hair is better achievedIt is bright, as shown in figure 1, especially using following set-up modes：The mechanical seal leakage Flow Measuring System is provided with flow modulationDevice and the droplet counting system being connected with fluence modulators, the fluence modulators include leakage stream collection funnel 1, damping hairTubule 2 and drop buncher 3, the leakage stream collection funnel 1 connect drop buncher 3 by damping capillary 2, and drop is adjustedChamber 3 processed is connected with droplet counting system, when setting, and damping capillary 2 is set in the bottom of leakage stream collection funnel 1,The bottom for damping capillary 2 sets drop buncher 3, drop buncher 3 is connected with droplet counting system, mechanical seal is let outThe leakage stream of leakage will be compromised collected by stream collection funnel 1, then using the progress damping deceleration of capillary 2 is damped, will leak out streamInitial velocity eliminate, and slowly leak into the internal modulation of drop buncher 3 and form complete drop so as in droplet counting systemCounted.
Embodiment 9：
The present embodiment is further optimized on the basis of any of the above-described embodiment, and further is that this hair is better achievedIt is bright, as shown in figure 1, especially using following set-up modes：The droplet counting system includes RF transmitter 4, infrared ray and connectSensor 5, measurement chamber 6 and process circuit 7 are received, the drop buncher 3 is arranged on measurement chamber 6, RF transmitter 4 and redOutside line receive sensor 5 be oppositely arranged on measurement chamber 6 both sides, process circuit 7 by transmission line 8 respectively with infrared emittingDevice 4 is connected with infrared receiver sensor 5；In specific design in use, the process circuit 7 will be RF transmitter 4There is provided driving power supply so that RF transmitter 4 sends infrared ray in case infrared receiver sensor 5 is received, and infrared rayReception sensor 5, which is received, is converted into electric signal after infrared ray, and the reception processing of processed circuit institute；Complete liquid after shapingDrop will come off out of drop buncher 3 then to be dropped into measurement chamber 6, and drop will pass through infrared emitting during fallingLight path between device 4 and infrared receiver sensor 5, and of short duration block is made to infrared receiver sensor 5 so that it is infraredThe infrared ray that line transmitter 4 is sent will not be received at the of short duration moment by infrared receiver sensor 5, now infrared receiverThere is pulse feature open circuit in sensor 5, forms pulse signal.
Embodiment 10：
The present embodiment is further optimized on the basis of any of the above-described embodiment, and further is that this hair is better achievedIt is bright, as shown in figure 1, especially using following set-up modes：The RF transmitter 4 and infrared receiver sensor 5 are symmetricalThe both sides of measurement chamber 6 are arranged on, i.e., are preferably when setting, drop will be met straight across RF transmitter during falling4 and the center line of light path that is formed of infrared receiver sensor 5.
In design in use, the setting of the relative position of Fluid modulation chamber 3 and measurement chamber 6 also meets drop from Fluid modulationShedded into device 3 measurement chamber 6 when, can directly through RF transmitter 4 and infrared receiver sensor 5 center line simultaneouslyIt can stop by the infrared ray of the directive infrared receiver sensor 5 of RF transmitter 4.
It is described above, be only presently preferred embodiments of the present invention, any formal limitation not done to the present invention, it is every according toAccording to the present invention technical spirit above example is made any simple modification, equivalent variations, each fall within the present invention protectionWithin the scope of.