CN201834758U - Hydraulic system of frequency conversion fuel oiling machine - Google Patents
Hydraulic system of frequency conversion fuel oiling machine Download PDFInfo
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- CN201834758U CN201834758U CN2010202394645U CN201020239464U CN201834758U CN 201834758 U CN201834758 U CN 201834758U CN 2010202394645 U CN2010202394645 U CN 2010202394645U CN 201020239464 U CN201020239464 U CN 201020239464U CN 201834758 U CN201834758 U CN 201834758U
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Abstract
The utility model discloses a hydraulic system of a frequency conversion fuel oiling machine. A variable frequency drive hydraulic system comprises a motor, a frequency converter, a displacement pump, an oil-gas separator, a flow measurement converter, a control main board with a counter, an indicating device, a magnet valve, an oil observing device, an encoder, an oil gun, a manual input system and a voltage control system, wherein an overflow valve is added in the variable frequency hydraulic system. The hydraulic system is characterized in that a limiting valve is arranged on a pipeline of the overflow channel of the overflow valve. As the outlet of the oil gun and an overflow outlet are connected in parallel, the reduction of overflow certainly causes the increasing of the flow of the outlet of the oil gun. Therefore, the frequency conversion fuel oiling machine adopting the operation method can greatly improve the work efficiency of the displacement pump.
Description
Technical field
The utility model relates to a kind of oil oiling machine hydraulic system, particularly a kind of variable-frequency oil oiling machine hydraulic system.
Background technology
Complete transport of liquid that existing regular fuel oiling machine hydraulic system generally is made up of major parts such as motor, positive displacement pump, oil separator, discharge measurement changer, coder, counting machine, indicating device, electromagnetic valve, oil sight device, oil gun, control main board and measuring system.Oiling machine hydraulic system all is provided with by pass valve and plays voltage stabilizing and overvoltage protection effect.Overflow has guaranteed the safety and steady operation of hydraulic efficiency pressure system, but is cost to sacrifice energy, because overflow derives from excess supply.In the common fuel charger, the hydraulic system with constant displacement pump that adopts non-frequency to drive is taked the hydraulic control strategy of omnidistance fixed supply, valve control throttling governing.Be that electrical motor drags pump output liquid medium with constant rotational speed all the time, and realize the liquid speed governing by the aperture of control pump outlet valve.The major defect that this hydraulic control mode exists is the Dynamic matching that is difficult for realizing input and load, and in the hydraulic efficiency pressure system that becomes when especially being embodied in intermittent exercise or load, this mode will inevitably cause input superfluous.Superfluous energy all will be converted into idle work, form various forms of degradations of energy such as overflow, noise, fluid temperature rise, reduce the power efficiency of system.
In order to reduce motor in the refueling process driven by motor positive displacement pump energy dissipation problem that causes of full speed running always, the applicant discloses a kind of hydraulic control system of fuel charger, and (patent No. is 200820205025.5, name is called the utility model patent of " a kind of oil oiling machine hydraulic system control setup ") this fuel charger hydraulic control system of adopting frequency converter+threephase asynchronous machine+Hydraulic Pump to form (is called the variable frequency hydraulic system, claim electrohydraulic system again, compare with conventional hydraulic, electrohydraulic system is many frequency converters on structure is formed), designed frequency conversion oiling pattern according to Variable Frequency Speed Regulation Principle, the speed of coming control 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 reached purpose of energy saving.After hydraulic efficiency pressure system adopts converter technique, require supply as required, eliminate or reduced excess supply, improved the power match rate because the hydraulic control mode changes into from the power source according to output.So the variable frequency hydraulic system is when normal operation, the overflow of system has reduced, not even overflow.The by pass valve pressure stabilization function that do not recur in the variable frequency hydraulic system only plays safety valve, an overflow off-load when load is transfinited.If can realize the coupling fully of horsepower input and output, then can not establish by pass valve.But in the real work, because the rotor inertia of threephase asynchronous machine is greater than the rotor inertia of Hydraulic Pump, cause the dynamic response of variable frequency hydraulic system slower, has general hysteresis, hydraulic control can't be accomplished very accurate, is necessary so by pass valve is set, when pipe resistance or external loading increase suddenly, can reduce system pressure by overflow, prevent that element is impaired.Can see, frequency conversion and combining of hydraulic pressure have caused the change of skimmer circuit characteristic, the reducing of excess supply makes the by pass valve design of original system relative redundancy occur, that is to say, in the variable frequency hydraulic system, the overflow of present by pass valve design can not make total system work in optimal working point.Therefore, improve existing variable frequency hydraulic system, it is imperative that the usefulness of hydraulic efficiency pressure system is optimized again.
The utility model content
The purpose of this utility model is to provide a kind of variable-frequency oil oiling machine hydraulic system, and this variable-frequency oil oiling machine hydraulic system can make the power efficiency of variable-frequency oil oiling machine variable frequency hydraulic system be further enhanced by reducing the overflow ducts of by pass valve.
For achieving the above object, the utility model adopts following technical scheme:
A kind of variable-frequency oil oiling machine hydraulic system, its variable frequency hydraulic system is connected to form with voltage-operated device as follows by control main board, indicating device, electromagnetic valve, oil sight device, coder, oil gun, the artificial input system of motor, frequency converter, positive displacement pump, oil separator, discharge measurement changer, tape counter: petrol storage tank is connected with oil gun successively with positive displacement pump, oil separator, discharge measurement changer, electromagnetic valve, oil sight device; Petrol storage tank also is connected successively with discharge measurement changer, coder, control main board and indicating device; The output of artificial input system connects the input of voltage-operated device; The output of voltage-operated device connects the input of frequency converter, and the output of frequency converter connects motor, and motor is connected with positive displacement pump; The output of control main board also connects the input of voltage-operated device; The output of frequency converter also connects electromagnetic valve; Be provided with by pass valve in the variable frequency hydraulic system, it is characterized in that, the pipeline of the overflow ducts of described by pass valve is provided with flow-limiting valve.
Further technical scheme is, when positive displacement pump adopted the EPZ positive displacement pump of Tokheim Hengshan Technology's production, by pass valve was arranged in the positive displacement pump, and described flow-limiting valve is arranged on the pipeline of the overflow ducts of by pass valve in the positive displacement pump.
When the EPZ positive displacement pump that described positive displacement pump adopts Tokheim Hengshan Technology (Guangzhou) Co., Ltd. to produce, electromagnetic valve adopted model to be the electromagnetic valve of asco, the cross-sectional diameter L of the overflow ducts of the described by pass valve that is provided with flow-limiting valve was: 23mm＜L≤14mm.
The method of work of above-mentioned variable-frequency oil oiling machine hydraulic system is characterized in that, comprises the steps:
The first step is turned the maximum spillway discharge of variable-frequency oil oiling machine variable frequency hydraulic system down;
In second step, use variable-frequency oil oiling machine hydraulic system by existing method.
Wherein, the variable frequency hydraulic system of variable-frequency oil oiling machine is interconnected by control main board, indicating device, voltage-operated device, oil sight device, oil gun, manual input device and the electromagnetic valve of motor, frequency converter, positive displacement pump, oil separator, discharge measurement changer, coder, tape counter and forms, and by pass valve is arranged in the variable frequency hydraulic system; Use variable-frequency oil oiling machine hydraulic system to be meant by existing method: (1) quantitative refueling: oiling person configures to refuel on the panel of control main board and rises number, such as 50L, mention oil gun then, this moment, motor power was opened, motor does not rotate, oiling person holds oil gun and goes to and wait to refuel before the vehicle, oil gun is put into fuel tank, select driving switch (can select big according to volume read-out, in or little shelves), this moment, voltage-operated device detected the voltage signal of driving switch input, and carry out this voltage signal and control frequency converter, the Frequency Converter Control motor is rotated according to the moving positive displacement pump of the cooresponding predefined frequency band of selected gear, the control main board control electromagnetic valve is opened simultaneously, at this moment opening the oil gun switch begins to refuel, this moment, coder sent a signal to control main board, the rolling counters forward of control main board, simultaneously signal is delivered to indicating device and risen number with real-time demonstration gas filed, when volume read-out arrives 49.7L, promptly (lead differs and is decided to be 0.3L as the also surplus 0.3L of volume read-out, can adjust according to actual requirements such as oil products) time, control main board is sent a signal and is given voltage-operated device, voltage-operated device detects the voltage signal from control main board, because its priority level is higher than the voltage signal of driving switch input, voltage-operated device is carried out this voltage signal, the control frequency converter makes the Frequency Converter Control motor rotate according to the moving positive displacement pump of the cooresponding predefined frequency band of this voltage.When counting machine arrives the volume read-out of setting, control main board is sent to voltage-operated device and is closed the rifle signal, and voltage-operated device control frequency converter shuts down motor, and the control main board control electromagnetic valve is closed simultaneously, oiling person is suspended to oil gun on the fuel charger, and refueling process is finished.(2) non-quantitation refuels: oiling person mentions oil gun, this moment, motor power was opened, oiling person holds oil gun and goes to and wait to refuel before the vehicle, oil gun is put into fuel tank, select driving switch (can select big according to volume read-out, in or little shelves), this moment, voltage-operated device detected the voltage signal of driving switch input, and carry out this voltage signal and control frequency converter, the Frequency Converter Control motor is rotated according to the moving positive displacement pump of the cooresponding predefined frequency band of selected gear, at this moment opening the oil gun switch begins to refuel, this moment, coder sent a signal to control main board, the rolling counters forward of control main board is delivered to signal indicating device simultaneously and is risen number with real-time demonstration gas filed, when fuel tank is filled it up with, the oil gun mouth is owing to being flooded self-styled (machinery is self-styled) that forms negative pressure by fluid, refueling process is finished.Oiling person is suspended to nozzle on the fuel charger, the disable motor source switch.Perhaps the front end at the oil gun oil outlet pipe is provided with a liquid level instrument, when fuel tank is filled it up with, the oil gun mouth is owing to flooded self-styled (machinery is self-styled) that forms negative pressure by fluid, refueling process is finished, meanwhile, the liquid level instrument sends an energizing signal and gives control main board, send a signal to voltage-operated device by control main board, the Frequency Converter Control motor is stopped operating, positive displacement pump stops oil pumping, the control main board control electromagnetic valve is closed simultaneously, and oiling person is suspended to oil gun on the fuel charger then, the disable motor source switch.
The maximum spillway discharge of turning variable-frequency oil oiling machine variable frequency hydraulic system in the described first step down is meant by the cross-sectional area of turning overflow ducts down and reduces maximum spillway discharge.
By pass valve is arranged on variable frequency hydraulic system in the positive displacement pump, and the described cross-sectional area of turning overflow ducts down is meant that the overflow ducts cross-sectional diameter L with positive displacement pump in the fuel charger variable frequency hydraulic system turns down; When positive displacement pump adopts the EPZ positive displacement pump that Tokheim Hengshan Technology (Guangzhou) Co., Ltd. produces, the overflow ducts cross-sectional diameter L of the by pass valve in the positive displacement pump is adjusted into: 23mm＜L≤14mm; For the positive displacement pump of other models, just the numerical value difference of adjusting as long as turn the design redundancy of by pass valve overflow ducts down, just can improve the efficient of positive displacement pump.
The method of work of above-mentioned variable-frequency oil oiling machine hydraulic system, can also be between the first step and second goes on foot for variable-frequency oil oiling machine is provided with standby mode, described standby mode is meant and is adding oil-gap, not stall of motor, but with the frequency f running, wherein: 8Hz≤f＜10Hz.
Because threephase asynchronous machine is a lot of greatly during the current ratio normal operation in starting process, the energy of consumption is also big a lot.Electric current when general cage rotor asynchronous dynamo starts is 4---7 a times of rated current, and the waste of power during startup is at ordinary times about 3 times.Be energy efficient and avoid electrical motor to reduce its service life because of overheated, need the actual condition of frequent operation in conjunction with the on-the-spot fuel charger of petrol service station, it is a kind of preferred scheme that the number of starts of asynchronous dynamo is limited.And the slow speed of revolution flow during standby plays the effect that signal parameter is provided under fuel charger variable frequency control strategy.If the no flow of fuel charger start, or flow is too small, then the discharge measurement changer detects less than signal, and coder can't produce pulse, and control main board can't be obtained impulse singla, and follow-up variable frequency control just has no way of realizing.
After standby mode was set, the mode of operation of variable-frequency oil oiling machine was:
(1) quantitative refueling: oiling person configures to refuel on the panel of control main board and rises number, such as 50L, mention oil gun then, this moment, motor power was opened, motor does not rotate, oiling person holds oil gun and goes to and wait to refuel before the vehicle, oil gun is put into fuel tank, select driving switch (can select big according to volume read-out, in or little shelves), this moment, voltage-operated device detected the voltage signal of driving switch input, and carry out this voltage signal and control frequency converter, the Frequency Converter Control motor is rotated according to the moving positive displacement pump of the cooresponding predefined frequency band of selected gear, at this moment opening the oil gun switch begins to refuel, this moment, coder sent a signal to control main board, the rolling counters forward of control main board, simultaneously signal is delivered to indicating device and risen number with real-time demonstration gas filed, when volume read-out arrives 49.7L, promptly (lead differs and is decided to be 0.3L as the also surplus 0.3L of volume read-out, can adjust according to actual requirements such as oil products) time, control main board is sent a signal and is given voltage-operated device, voltage-operated device detects the voltage signal from control main board, because its priority level is higher than the voltage signal of driving switch input, voltage-operated device is carried out this voltage signal, the control frequency converter makes the Frequency Converter Control motor rotate according to the moving positive displacement pump of the cooresponding predefined frequency band of this voltage.When counting machine arrives the volume read-out of setting, control main board is given to voltage-operated device and is sent pass rifle signal, voltage-operated device control Frequency Converter Control motor is with frequency f (8Hz≤f＜10Hz) running, while Frequency Converter Control closed electromagnetic valve, refueling process is finished, oiling person is suspended to oil gun on the fuel charger, and pump is in readiness for action.(because the overflow of EPZ pump is interior circulation, the fluid that pump this moment is to flow out from overflow ducts)
(2) non-quantitation refuels: oiling person mentions oil gun, this moment, motor power was opened, oiling person holds oil gun and goes to and wait to refuel before the vehicle, oil gun is put into fuel tank, select driving switch (can select big according to volume read-out, in or little shelves), this moment, voltage-operated device detected the voltage signal of driving switch input, and carry out this voltage signal and control frequency converter, the Frequency Converter Control motor is rotated according to the moving positive displacement pump of the cooresponding predefined frequency band of selected gear, at this moment opening the oil gun switch begins to refuel, this moment, coder sent a signal to control main board, the rolling counters forward of control main board is delivered to signal indicating device simultaneously and is risen number with real-time demonstration gas filed, when fuel tank is filled it up with, the oil gun mouth is owing to being flooded self-styled (machinery is self-styled) that forms negative pressure by fluid, refueling process is finished.Oiling person is suspended to nozzle on the fuel charger, by artificial input select gear make motor with frequency f (8Hz≤f＜10Hz) running, pump be in readiness for action (standby switches be provided with principle and other gears that principle is set is identical).Perhaps the front end at the oil gun oil outlet pipe is provided with a liquid level instrument, when fuel tank is filled it up with, the oil gun mouth is owing to flooded self-styled (machinery is self-styled) that forms negative pressure by fluid, refueling process is finished, meanwhile, the liquid level instrument sends an energizing signal and gives control main board, sends a signal to voltage-operated device by control main board, make the Frequency Converter Control motor with frequency f (8Hz≤f＜10Hz) running, Frequency Converter Control closed electromagnetic valve simultaneously.Oiling person is suspended to oil gun on the fuel charger then, and pump is in readiness for action.
The principle of design that reduces overflow is:
According to general-duty valve port flow rate calculation formula on the engineering
q＝K
LAΔp
m
K in the formula
L---throttling coefficient, relevant with port shape, fluid flow pattern, fluid character.
A---passage section area.
Δ p---the difference of pressure of the valve port of flowing through.
M---delivery exponent, m ∈ [0.5,1], valve port approaches the thin-walled aperture more, and m is more little; Valve port approaches elongated hole more, and m is big more.
As can be known, can come A to reduce overflow by the cross-sectional area of turning overflow ducts down.
The utility model with respect to advantage and the effect that prior art has is:
Because oil gun outlet and overflow outlet are relations in parallel, the increase that reduces to cause the oil gun rate of discharge of overflow, therefore, the hydraulic efficiency pressure system of variable-frequency oil oiling machine of the present utility model can improve the work efficiency of positive displacement pump greatly.
Description of drawings
Fig. 1 is the block diagram of variable-frequency oil oiling machine hydraulic system;
Fig. 2 is the structural representation of positive displacement pump of the variable-frequency oil oiling machine of embodiment 1-3;
Fig. 3 is the structural representation of flow-limiting valve among Fig. 2;
Fig. 4 is the flow-limiting valve shown in Figure 2 and the mounting structure scheme drawing of by pass valve;
Fig. 5 is that the overflow ducts internal diameter reduces graph of relation with oil gun rate of discharge and muzzle pressure among the embodiment one;
Fig. 6 is different stand frequency corresponding flooding damage curve figure among the embodiment three.
The specific embodiment
Below in conjunction with embodiment and accompanying drawing the utility model is described in further detail, but embodiment of the present utility model is not limited thereto.
The hydraulic control system of the variable-frequency oil oiling machine that following all embodiment adopt, its variable frequency control principle is identical with the utility model patent that name is called " a kind of oil oiling machine hydraulic system control setup " (patent No. is 200820205025.5).The block diagram of the variable frequency hydraulic system of the variable-frequency oil oiling machine that following all embodiment adopt as shown in Figure 1.
Embodiment one
Block diagram variable-frequency oil oiling machine as shown in Figure 1 to the variable frequency hydraulic system uses by following method of work, and wherein, it is the electromagnetic valve of asco that electromagnetic valve adopts model:
The first step, on the pipeline of the by pass valve in the positive displacement pump in the variable frequency hydraulic system flow-limiting valve is set, what wherein positive displacement pump adopted is the EPZ pump that Tokheim Hengshan Technology (Guangzhou) Co., Ltd. produces, its structure as shown in Figure 2, comprise the pump housing 1, pump cover 2, filter 3, pump chamber 4, oil separator 5, air chamber 6, float valve 7, outlet valve 8, blow off valve 9, by pass valve 10, connection for bbreather pipe 11, swirl valve 12, the former by pass valve outlet diameter of EPZ pump is 23mm, for reducing the maximum spillway discharge of by pass valve, structure current limliting valve pocket 13 as shown in Figure 3 is located on the pipeline of by pass valve outlet (as shown in Figure 4), makes the diameter of overflow passage be reduced to 14mm from 23mm.
Second step, use this variable-frequency oil oiling machine hydraulic system by existing method, and record overflow passage cooresponding fuel charger oil gun rate of discharge and delivery pressure (as shown in Figure 5) when reducing.
Find out by Fig. 5, when the overflow ducts diameter is reduced to 14mm, the muzzle oil pump capacity 4L that risen.Because oil gun outlet and overflow outlet are relations in parallel, the increase that reduces to cause the oil gun rate of discharge of overflow by eliminating overflow ducts design-calculated amount of redundancy, has improved the work efficiency of pump.Simultaneously, the oil gun delivery pressure rises to 0.25mpa by 0.2mpa.Pressure comes from the pipe resistance, does not change but manage resistance, has proved the increase of muzzle oil pump capacity.
Embodiment two
All be provided with electromagnetic valve on the fuel charger and prevent oil mass " overshoot ".After oil gun is closed, excess landing lotus in the EPZ pump by pass valve that Tokheim Hengshan Technology (Guangzhou) Co., Ltd. produces, the pump internal pressure can carry out the transition to stable state from transient peak.Facts have proved,, can cause the electromagnetic valve valve to work if steady state pressure is excessive, shooting once more after oil gun is closed, muzzle can't be fuel-displaced.Stability is the basis of system operation, because security of system pressure is much larger than stable operation pressure, so the top pressure when electromagnetic valve can be opened is the optimum pressure that by pass valve should be opened.
On the frequency conversion fuel charger that adopts variable frequency hydraulic system as shown in Figure 1 (wherein, it is the electromagnetic valve of asco that electromagnetic valve adopts model), the diameter L of overflow ducts is arranged between 23mm＜L≤14mm, system's normal operation, when the diameter of overflow ducts is reduced to below the 14mm, electromagnetic valve and system can't work.And change common fuel charger overflow ducts internal diameter into 14mm, finish once refuel after, the muzzle of shooting once more is not fuel-displaced, and can't hear the sound that electromagnetic valve is beated, and shows that electromagnetic valve can't work.
Experimental result on the frequency conversion fuel charger with common fuel charger on different, variation has taken place in common fuel charger skimmer circuit characteristic after having verified the utilization converter technique, design relative redundancy appears in former overflow ducts, the inference that the by pass valve diameter can more former common fuel charger reduces again.
Embodiment three
Block diagram variable-frequency oil oiling machine as shown in Figure 1 to the variable frequency hydraulic system uses by following method of work, wherein, what positive displacement pump adopted is the EPZ pump that Tokheim Hengshan Technology (Guangzhou) Co., Ltd. produces, and it is the electromagnetic valve of asco that electromagnetic valve adopts model:
The first step makes the diameter of overflow passage be reduced to 14mm from 23mm by the mode of embodiment one.
In second step, for this variable-frequency oil oiling machine is provided with standby mode, described standby mode is meant and is adding oil-gap, not stall of motor, but with the frequency f running, wherein: 8Hz≤f＜10Hz.Before the overflow ducts bore did not reduce, if treat that unit frequency is lower than 10HZ, the discharge measurement conv can't detect flow, before promptly the overflow ducts bore does not reduce, treated that unit frequency is minimum can only be set to 10 hertz.After the overflow ducts bore reduced, the oil gun rate of discharge had increased relatively, treated that unit frequency can reduce again.When EPZ pump overflow caliber is reduced to 14mm, treat that unit frequency is minimum can reduce to 8HZ.Below the 8HZ, flow counter will detect less than flow.
In the 3rd step, use this variable-frequency oil oiling machine hydraulic system by existing method.
After standby mode is set, saves the energy consumption of motor frequent starting and avoid motor to reduce its service life because of overheated.
Fig. 6 is different stand frequency corresponding flooding damage curve figure, as can be seen from Figure 6, cooresponding standby power loss 267W when treating that unit frequency is 10HZ, loss power 216W when treating that unit frequency is 8HZ, saving power 51W, fractional energy savings is about 11.26%.
By the about 5,600 ten thousand tons volume read-out of national annual gasoline that statistics shows, the average density of getting gasoline is 0.727g/ml, and with the speed oil that adds of 44L/min, the whole nation is annual refueled about 2,920 ten thousand hours consuming time.Generally speaking, at the scene of refueling, the time of fuel charger 20% is used in the standby, and the whole nation annual oiling standby is consuming time up to 7,300,000 hours.This just means that the frequency conversion fuel charger treats that unit frequency is reduced to 8HZ from 10HZ, estimates every year and can save electric energy 370,000 degree for country.And treat that reducing of unit frequency have benefited under frequency conversion drive fully to the redundant elimination of original hydraulic system overflow design.
The foregoing description is the utility model preferred implementation; but embodiment 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 (3)
1. variable-frequency oil oiling machine hydraulic system, its variable frequency hydraulic system is connected to form with voltage-operated device as follows by control main board, indicating device, electromagnetic valve, oil sight device, coder, oil gun, the artificial input system of motor, frequency converter, positive displacement pump, oil separator, discharge measurement changer, tape counter: petrol storage tank is connected with oil gun successively with positive displacement pump, oil separator, discharge measurement changer, electromagnetic valve, oil sight device; Petrol storage tank also is connected successively with discharge measurement changer, coder, control main board and indicating device; The output of artificial input system connects the input of voltage-operated device; The output of voltage-operated device connects the input of frequency converter, and the output of frequency converter connects motor, and motor is connected with positive displacement pump; The output of control main board also connects the input of voltage-operated device; The output of frequency converter also connects electromagnetic valve; Be provided with by pass valve in the variable frequency hydraulic system, it is characterized in that, the pipeline of the overflow ducts of described by pass valve is provided with flow-limiting valve.
2. variable-frequency oil oiling machine hydraulic system according to claim 1 is characterized in that described positive displacement pump is meant the EPZ positive displacement pump; Described by pass valve is arranged in the positive displacement pump.
3. variable-frequency oil oiling machine hydraulic system according to claim 2 is characterized in that, the cross-sectional diameter L of the overflow ducts of the described by pass valve that is provided with flow-limiting valve is: 23mm＜L≤14mm; It is the electromagnetic valve of asco that described electromagnetic valve adopts model.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202394645U CN201834758U (en) | 2010-06-25 | 2010-06-25 | Hydraulic system of frequency conversion fuel oiling machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202394645U CN201834758U (en) | 2010-06-25 | 2010-06-25 | Hydraulic system of frequency conversion fuel oiling machine |
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| CN201834758U true CN201834758U (en) | 2011-05-18 |
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| CN2010202394645U Expired - Lifetime CN201834758U (en) | 2010-06-25 | 2010-06-25 | Hydraulic system of frequency conversion fuel oiling machine |
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Granted publication date: 20110518 |