CN202001273U - Frequency conversion hydraulic control system of fuel oil adding machine - Google Patents
Frequency conversion hydraulic control system of fuel oil adding machine Download PDFInfo
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- CN202001273U CN202001273U CN2011200548963U CN201120054896U CN202001273U CN 202001273 U CN202001273 U CN 202001273U CN 2011200548963 U CN2011200548963 U CN 2011200548963U CN 201120054896 U CN201120054896 U CN 201120054896U CN 202001273 U CN202001273 U CN 202001273U
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Abstract
The utility model relates to a frequency conversion hydraulic control system of a fuel oil adding machine, which is characterized in that the frequency conversion hydraulic control system consists of a motor, a frequency converter, a displacement pump, an oil-gas separator, a flow measurement converter, a coder, a main control board, an indication device, an oil inspection device and an oil gun that are connected in the following way: an oil storage tank is sequentially connected with the displacement pump, the oil-gas separator, the flow measurement converter, an oil inspection device and the oil gun; the flow measurement converter is sequentially connected with the coder, the main control board and the indication device; and the output of the main control board is sequentially connected with the frequency converter, the motor and the displacement pump. The control system does not need to adopt an electromagnetic valve, is simplified and has good precision of oiling in fixed quantity.
Description
Technical field
The utility model relates to a kind of hydraulic control system of fuel charger, particularly a kind of variable frequency hydraulic control system of fuel charger.
Background technique
Complete liquid transport that existing regular fuel oilling machine hydraulic control system generally is made up of critical pieces such as motor, displacement pump, deaerator, flow measurement transducer, encoder, counter, indicating device, solenoid valve, oil sight device, oil gun, control mainboards and measuring system.In oilling machine when work,, displacement pump is transported to fluid eminence, delivers to high pressure, delivers to the flow measurement transducer along pipeline the volume of oil is measured from low pressure from lower, finally comes out to consign to the user from oil gun.What the hydraulic system of oilling machine was different from general hydraulic pressure transport system is: oilling machine is owing to there is higher measuring accuracy requirement, and the complete machine hydrodynamic pressure is not only wanted dependable flow, also wants the stability of dependable flow stability and pressure.
The routine oiling mode of existing regular fuel oilling machine comprises that quantitative refueling and non-quantitation refuel two kinds, the mode of operation of its hydraulic system is: (1) is under the pattern of quantitative refueling, oil oiling machine hydraulic system is work like this: oiling person configures to refuel on the panel of control mainboard and rises number, such as 50L, mention oil gun then, this moment, motor and solenoid valve were all opened, displacement pump begins to rotate at full speed, oiling person holds oil gun and goes to and wait to refuel before the vehicle, oil gun is put into fuel tank, open and add oil switch and begin to refuel, this moment, encoder sent a signal to the control mainboard, the rolling counters forward of control mainboard, simultaneously signal is delivered to the rise number of indicating device with real-time demonstration oiling, when volume read-out arrives 49.7L, promptly (0.3L is the advancement amount that oilling machine is set as the also surplus 0.3L of volume read-out, can require to adjust according to reality such as oil products) time, the control mainboard sends a signal, close the main valve of solenoid valve, when counter arrived the volume read-out of setting, the control mainboard sent signal, close the secondary valve of solenoid valve, motor stops operating simultaneously, and then oiling person is suspended to off switch on the oilling machine with oil gun, and refueling process is finished.(2) under the pattern that non-quantitation refuels, oil oiling machine hydraulic system is work like this: oiling person mentions oil and robs, this moment, motor and solenoid valve were all opened, displacement pump begins to rotate at full speed, oiling person holds oil gun and goes to and wait to refuel before the vehicle, oil gun is put into fuel tank, opening the oil gun switch begins to refuel, this moment, encoder sent a signal to the control mainboard, the rolling counters forward of control mainboard is delivered to signal the rise number of indicating device with real-time demonstration oiling, simultaneously when fuel tank is filled it up with, refuel muzzle owing to flooded self-styled (machinery is self-styled) that forms negative pressure by fluid, generally also need to carry out adding of a small amount of fluid from being honored as a queen,, added back oiling person oil gun is suspended to off switch on the oilling machine with the degree of accuracy that guarantees to refuel, motor stops operating, and refueling process is finished.
Solenoid valve in the hydraulic control system of common oilling machine adopts double-valve structure, and a large-capacity valve (main valve) and a rill metered valve (secondary valve) are promptly arranged.Its working principle is: when quantitative refueling begins; solenoid valve all energising is opened; the main valve and the secondary valve that are solenoid valve are all opened; when volume read-out was left 0.3L, the control mainboard of oilling machine sent control signal, turn-offed main valve; oilling machine continues to refuel preset value by secondary valve; oilling machine control this moment mainboard sends control signal again and turn-offs secondary valve, and motor stall is immediately simultaneously shut down preceding " overshoot " thereby reduced oilling machine greatly.And in non-quantitation refueled beginning, the major-minor valve of solenoid valve was all opened, and in refueling process, solenoid valve does not turn-off action, finished just to turn-off the major-minor valve simultaneously behind the rifle of pass up to refueling.This shows that the performance of solenoid valve directly affects the precision of the quantitative refueling of oilling machine, its influence was more obvious when particularly small flow refueled.
In the process of quantitative refueling, solenoid valve is by reducing to refuel the cross-section area of pipeline, promptly increase the pipe resistance reduce to refuel finish before the flow velocity of fluid, reached the purpose that reduces " overshoot ", thereby guaranteed that oilling machine presets the degree of accuracy of oiling.But in this process, exist following deficiency again:
1, in the moment that main valve turn-offs, because the cross-section area of pipeline reduces suddenly, make that violent variation takes place the flow velocity of fluid in the pipeline, therefore produced water attack.It is because when liquid stream stops suddenly that water attack produces, because working fluid and moving element action of inertia, its kinergety becomes the high pressure wave that is begun by halt, and it transmits along pipe-line system back and forth with the speed that approaches the velocity of sound, makes the very high pressure of instantaneous appearance in the system.Water attack not only influences the stability and the functional reliability of hydraulic system, also can cause phenomenons such as vibration and noise and link become flexible, even pipe breakage, hydraulic element and instrumentation are damaged, and consequence is more serious in the dispenser system of big flow.
Though " overshoot " when 2, solenoid valve has reduced to refuel improved the degree of accuracy of refueling, and increased the pressure drop of cost and pipeline also simultaneously, increased energy consumption, reduced the efficient of motor and pump.Through measuring, when flow was 60L/min, common oilling machine was about about 0.03MPa with the pressure drop that solenoid valve produced of double-valve structure.
3, after main valve is closed, only to fill it up with in the process of last 0.3L oil with secondary valve, the oiling flow of oilling machine is unknowable, also is uncontrollable.
In order to save the energy consumption of motor and displacement pump, the technology (hereinafter to be referred as variable frequency hydraulic control system) of oil oiling machine hydraulic system being carried out VFC has appearred adopting, the hydraulic system of this fuel charger adopts variable-frequency motor, designed frequency conversion oiling pattern according to Variable Frequency Speed Regulation Principle, control the speed of displacement pump pump oil by the frequency of adjusting motor, realized that control of frequency conversion rotating speed and valve gear are controlled at the coupling on the flow, have effectively controlled water hammer and have reached purpose of energy saving.Because adopt variable-frequency motor to drive displacement pump work, by the control to the displacement pump frequency, solenoid valve can be reduced to the solenoid valve of single valve structure.But the variable-frequency oil oiling machine hydraulic system of this employing single valve structure solenoid valve still has the space of further optimization.
The model utility content
The purpose of this utility model is to overcome the shortcoming of prior art, provides a kind of on the basis of the fuel charger hydraulic control system that adopts converter technique, need not to adopt the new hydraulic control system of solenoid valve.
For achieving the above object, the utility model adopts following technological scheme: a kind of oilling machine variable frequency hydraulic control system, it is characterized in that, connected to form as follows by motor, frequency variator, displacement pump, deaerator, flow measurement transducer, encoder, control mainboard, indicating device, oil sight device, oil gun: oil storage tank is connected with oil gun successively with displacement pump, deaerator, flow measurement transducer, oil sight device; The flow measurement transducer also is connected with indicating device successively with encoder, control mainboard; The output of control mainboard also connects frequency variator, motor and displacement pump successively.
Owing to no longer adopt solenoid valve, simplified the structure of variable frequency hydraulic control system, reduced the complete machine cost, eliminated the water hammer in the hydraulic system.
The precision control new method of above-mentioned oilling machine variable frequency hydraulic control system quantitative refueling is to replace solenoid valve to realize the precision of quantitative refueling is controlled by the rotating speed of displacement pump in the oilling machine variable frequency hydraulic control system is controlled.
More particularly, described rotating speed control to displacement pump is meant displacement pump is controlled at the rotating speed of advancement amount oiling during the stage that oilling machine enters setting.
Described rotating speed control to displacement pump is to realize by the rotating speed of the variable-frequency motor of control drive displacement pump.
Preferred scheme is: with the surplus frequency setting of described variable-frequency motor is 20～36 hertz; The surplus frequency of described variable-frequency motor is meant the frequency of okperation of oilling machine variable-frequency motor when the advancement amount that enters setting refuels the stage.With the surplus frequency setting of described variable-frequency motor is that 32Hz is an optimum scheme, and this moment, the flow of fluid was 29L/min.
The advancement amount that described oilling machine is set is meant 0.3 liter.
Design principle of the present utility model is such:
1, common oilling machine quantitative refueling process refuels that to finish be to be turn-offed by solenoid valve fluid is no longer outflowed: when promptly volume read-out reached default value, motor still rotated, but the big or small valve of solenoid valve all close, oil circuit turn-offs, fluid no longer outflows.The oilling machine that removes behind the solenoid valve then is to stop fluid to continue to flow out by the delivery side of pump valve breakdown: when promptly volume read-out reaches default value, motor stops operating under the control of frequency variator, and pump is owing to run out of steam, also reduce speed now so that stop (time is extremely of short duration), oil pressure also reduces gradually in the pump, because the oil liquid pressure that the delivery side of pump valve is subjected to reduces, outlet valve is under spring action, just, turn-off delivery side of pump, stoped the outflow of fluid to left movement.In the process that outlet valve turn-offs, can from following formula, obtain the fluid volume that flows out:
Wherein, M is the rotary inertia of pump rotor;
θ is the angle that pump rotor turns in stalling;
M is the quality of outlet valve;
C is the viscous resistance coefficient of fluid;
K is the elasticity coefficient of outlet valve spring;
X is the displacement of outlet valve in turn off process.
As long as obtain the displacement x of outlet valve, the cross-section area that multiply by outlet valve more just can draw outlet valve discharges the volume of fluid when closing.
2, to the control of measuring accuracy
The tendency chart that the precision of oilling machine flowmeter changes with motor speed as shown in Figure 2.We can know from Fig. 2, and the precision of flowmeter is along with the variation of flow changes, and the variation of flow mainly is to be determined by motor speed under fixing operating mode.
At the 1st model of talking about, we can obtain in the outlet valve turn off process, the fluid volume of giving more, and then calculate its ratio shared in quantitative value, promptly draw its influence to the oiling precision.And this part fluid volume is closely related with the initial velocity of pump rotor when closing, and is promptly relevant with the speed of motor under the small flow frequency.Therefore we can select a suitable motor speed, allow the precision of its dependable flow meter be in a reasonable position, simultaneously can allow the rotor of pump in time stop again, promptly allow the fluid volume given few as much as possible more, so just can make the oiling precision of whole process reach the highest.As Fig. 2 vertical line position, the precision of supposing flowmeter on this position reaches requirement, simultaneously the rotor of pump can stop again soon, is best with respect to its complete machine precision of other positions just, and this is our only motor speed that will obtain just.
After adopting this rotating speed, need not the control of solenoid valve, the quantitative refueling precision of oilling machine is met the demands.
The utility model has following advantage and effect with respect to prior art:
1, oilling machine variable frequency hydraulic control system of the present utility model need not to adopt solenoid valve again, has simplified the structure of hydraulic system, reduces the complete machine cost;
2, the new control method of oilling machine variable frequency hydraulic control system quantitative refueling of the present utility model by the rotating speed of motor that drives displacement pump is controlled, makes the oilling machine that has removed solenoid valve can reach better effect aspect the quantitative refueling control.
Description of drawings
Fig. 1 is the structural representation of oilling machine variable frequency hydraulic control system of the present utility model;
Fig. 2 is the tendency chart that the precision of oilling machine flowmeter changes with motor speed.
Embodiment
Below in conjunction with embodiment and accompanying drawing the utility model is described in further detail, but mode of execution of the present utility model is not limited thereto.
Embodiment
Oilling machine variable frequency hydraulic control system of the present utility model, as shown in Figure 1, connected to form as follows by motor, frequency variator, displacement pump, deaerator, flow measurement transducer, encoder, control mainboard, indicating device, oil sight device, oil gun: oil storage tank is connected with oil gun successively with displacement pump, deaerator, flow measurement transducer, oil sight device; The flow measurement transducer also is connected with indicating device successively with encoder, control mainboard; The output of control mainboard also connects frequency variator, motor and displacement pump successively.
Oiling precision to the above-mentioned fuel charger hydraulic control system of the power down magnet valve that gets on the frequency conversion basis detects, and sees when the advancement amount that enters setting refuels the stage variable-frequency motor adopts to refuel precision different surplus frequencies (different in flow rate) under and whether meet NBS (the oiling precision is between ± 0.3%).Test result is as shown in table 1 below:
Table 1 test oiling precision result
The result of above-mentioned test, the original frequency of variable-frequency motor adopts the electric machine frequency of present frequency conversion oilling machine Electric Machine Control gear correspondence commonly used: 22～38 hertz (be oil flow 16～38L/min), surplus is set at 0.3 liter.By table 1 we as can be seen, remove the variable-frequency oil oiling machine of solenoid valve, when variable-frequency motor still adopted original frequency commonly used, the precision of refueling still reached the standard of country, promptly refuel relative error all between ± 0.3%, and reached goodish precision level.
Therefrom we can also see that in the surplus frequency be 32Hz, when flow is 29L/min, the precision of refueling is the highest, and accuracy value is distributed in the field at zero point, this flow belongs to critical flow, therefore, here we select the best surplus frequency of 32Hz as us, and 29L/min is then as our desired optimum flow.
The foregoing description is the utility model preferred implementation; but mode of execution of the present utility model is not restricted to the described embodiments; other any do not deviate from change, the modification done under spirit of the present utility model and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within the protection domain of the present utility model.
Claims (1)
1. oilling machine variable frequency hydraulic control system, it is characterized in that, connected to form as follows by motor, frequency variator, displacement pump, deaerator, flow measurement transducer, encoder, control mainboard, indicating device, oil sight device, oil gun: oil storage tank is connected with oil gun successively with displacement pump, deaerator, flow measurement transducer, oil sight device; The flow measurement transducer also is connected with indicating device successively with encoder, control mainboard; The output of control mainboard also connects frequency variator, motor and displacement pump successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200548963U CN202001273U (en) | 2011-03-04 | 2011-03-04 | Frequency conversion hydraulic control system of fuel oil adding machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200548963U CN202001273U (en) | 2011-03-04 | 2011-03-04 | Frequency conversion hydraulic control system of fuel oil adding machine |
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| Publication Number | Publication Date |
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| CN202001273U true CN202001273U (en) | 2011-10-05 |
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| CN2011200548963U Expired - Fee Related CN202001273U (en) | 2011-03-04 | 2011-03-04 | Frequency conversion hydraulic control system of fuel oil adding machine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102173372A (en) * | 2011-03-04 | 2011-09-07 | 华南理工大学 | Variable-frequency hydraulic control system for fuel dispenser and novel precision control method for quantitative fuel filling thereof |
| CN110566815A (en) * | 2018-06-06 | 2019-12-13 | 中国石油化工股份有限公司 | system for unloading tank car light oil by using rotary piston pump and operation method thereof |
| CN110562907A (en) * | 2018-06-06 | 2019-12-13 | 中国石油化工股份有限公司 | Automatic control system for unloading tank car light oil by using rotary piston pump and control method thereof |
-
2011
- 2011-03-04 CN CN2011200548963U patent/CN202001273U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102173372A (en) * | 2011-03-04 | 2011-09-07 | 华南理工大学 | Variable-frequency hydraulic control system for fuel dispenser and novel precision control method for quantitative fuel filling thereof |
| CN110566815A (en) * | 2018-06-06 | 2019-12-13 | 中国石油化工股份有限公司 | system for unloading tank car light oil by using rotary piston pump and operation method thereof |
| CN110562907A (en) * | 2018-06-06 | 2019-12-13 | 中国石油化工股份有限公司 | Automatic control system for unloading tank car light oil by using rotary piston pump and control method thereof |
| CN110566815B (en) * | 2018-06-06 | 2021-03-19 | 中国石油化工股份有限公司 | System for unloading tank car light oil by using rotary piston pump and operation method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111005 Termination date: 20140304 |