CN101769824A - Quantitative feed electric control pressure reductor, characteristic test system for pressure reductor and automatic test method - Google Patents
Quantitative feed electric control pressure reductor, characteristic test system for pressure reductor and automatic test method Download PDFInfo
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- CN101769824A CN101769824A CN200810224753A CN200810224753A CN101769824A CN 101769824 A CN101769824 A CN 101769824A CN 200810224753 A CN200810224753 A CN 200810224753A CN 200810224753 A CN200810224753 A CN 200810224753A CN 101769824 A CN101769824 A CN 101769824A
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Abstract
The invention relates to a quantitative feed electric control pressure reductor, a characteristic test system for the pressure reductor and an automatic test method. The quantitative feed electric control pressure reductor comprises a quantitative air charging device and a quantitative air discharging device, and the quantitative air charging device and the quantitative air discharging device respectively control the movement of a valve core with an air charging magnet coil and an air discharging magnet coil in an pulse mode to quantitatively charge or discharge air to a control cavity, thereby the outlet pressure of the quantitative feed electric control pressure reductor is regulated to a setting value; the quantitative feed electric control pressure reductor, a measured pressure reductor, a sensor device, a control valve, a data acquisition and control circuit and like are connected in series to form the characteristic test system for the pressure reductor, the outlet pressure of the quantitative feed electric control pressure reductor is used as the inlet pressure of the measured pressure reductor, the sensor and a collection card are used as a data acquisition device, the automatic performance of the characteristic test of the measured pressure reductor is realized by computer process control, and the test data is displayed and recorded in real time.
Description
Technical field
The present invention relates to the ground experiment of rocket engine propellant transfer system, be mainly used in the pressure characteristic test and the discharge characteristic test of members such as decompressor in the induction system, valve.
Background technology
Decompressor is the vitals in the propellant transfer system, and its effect is to make the high-pressure gas pressure of import reduce to the value of regulation, and is stabilized within certain pressure limit, and it is the parts that utilize Throttle Principle work.As shown in Figure 1, gases at high pressure 1 enter high pressure chest 2 from entering the mouth, and under the effect of spring 10, spool 4 tightly is pressed together on the valve seat 3, and decompressor is in closed condition.When the decompressor valve downstream is closed, be P to control chamber 6 charged pressures by control gas inlet 5
cGas, under the promotion of gaseous tension, piston 7 drives spool 4 and moves down, make the certain aperture of valve open, gases at high pressure in the high pressure chest 2 enter into low-pressure cavity 8 by the slit between spool 4 and the valve seat 3, gaseous tension in the low-pressure cavity improves constantly, when its pressure greater than control chamber gaseous tension P
cThe time, piston 7 drives spool 4 and moves up, and makes valve slowly close.If open the decompressor valve downstream this moment, then the pressure of low-pressure cavity 8 reduces until less than control chamber pressure, this moment, valve reopened, high pressure chest 2 is to low-pressure cavity 8 air feed, when low-pressure cavity 8 pressure and control chamber 6 pressure equilibriums, valve is stabilized on certain aperture, and decompressor is stable to provide low-pressure gas, flows to the downstream by exporting 9.
Decompressor is widely used in aerospacecraft and ground-testing plant, plays important control and regulating action.Fig. 2 has provided the typical propellant agent induction system of having simplified.Store in the gas-holder 11 gases at high pressure (20～30MPa), when valve 15 was opened, gases at high pressure were flowed through behind the decompressor 13, become low-pressure gas (1～8MPa), be transported to engine or miscellaneous part through valve.Tensimeter 12 is used for measuring decompressor upstream gas pressure, and tensimeter 14 is used for measuring the gaseous tension in decompressor downstream.In use, the gas in the gas-holder is fewer and feweri, the gaseous tension P of its storage inside
1Constantly reduce, but decompressor top hole pressure P
2Still can maintain near the initial value, so decompressor top hole pressure P
2With inlet pressure P
1The scope that changes and fluctuation takes place is to weigh an important indicator of decompressor performance, the static characteristics of Here it is decompressor.Fig. 3 has provided certain model decompressor static characteristic curve, decompressor inlet pressure P
1When 4～14MPa changes, its top hole pressure P
2Near fuctuation within a narrow range 2MPa, this decompressor has static characteristics preferably.
Another important indicator that can the measurement decompressor normally use is a dynamic perfromance.Dynamic perfromance is meant decompressor top hole pressure P
2Depart from the process that automatically restores to set-point behind the set-point, if this process is the continuous oscillation or the process of dispersing, perhaps this process oscillation amplitude is excessive or convergence time is long, and this decompressor all can not normally use.Fig. 4 has provided the dynamic characteristic of certain model decompressor when valve downstream throws open.
Can static characteristics and dynamic perfromance are related to decompressor normally use in spacecraft and uphole equipment, therefore must carry out static characteristics and dynamic characteristic test checking to the decompressor that assembles.Traditional pilot system as shown in Figure 5, there are gases at high pressure (being generally air or nitrogen) in the gas-holder 11, high pressure hand valve 16 is master switchs of source of the gas, high pressure throttling valve 17 and low pressure throttling valve 18 are two critical components, by regulating two throttling valve, can flow to the downstream to the lower pressure that the gaseous tension of upstream becomes any needs, the high pressure throttling valve is used for regulating the inlet pressure P of tested decompressor 13
1, the low pressure throttling valve is used for controlling the pressure P of sonic nozzle 20 inlets
3The decompressor entrance and exit is respectively arranged a tensimeter 12 and 14, is used for the record entry pressure P respectively
1With top hole pressure P
2, tensimeter 19 is used for writing down the preceding pressure P of sonic nozzle
3, solenoid valve 15 is system switchings.The flow control principle of sonic nozzle can be represented with following formula:
In the formula,
It is flow by sonic nozzle;
K is a coefficient of flow, by the physical dimension and the crudy decision of sonic nozzle;
P
3It is the sonic nozzle inlet pressure;
T is the gas stagnation temperature;
A is the sonic nozzle throat opening area.
By this formula as can be seen, in the single test process, the gas flow by sonic nozzle is fully by sonic nozzle inlet pressure P
3Decision just can be controlled the inlet pressure of sonic nozzle by regulating low pressure throttling valve 18, and then Control Flow.
During the static characteristics of checking decompressor, require in the whole test gas flow constant, in the test as long as keep P
3Constant, promptly can keep flow constant.At first need under the situation of high pressure full trrottle, regulate decompressor and low pressure throttling valve during test, make it to meet duty, make P
2With P
3Be predetermined value, then for different decompressor inlet pressure P
1(regulating the high pressure throttling valve realizes) keeping P
3(regulating the low pressure throttling valve realizes) obtains different decompressor top hole pressure P under the constant situation
2So just can obtain one group of P
1With P
2With data, be exactly the static characteristics data of this decompressor.
Decompressor characteristic test system shown in Figure 5 is to each P
1Data all will be regulated high pressure throttling valve and low pressure throttling valve, and the requirement of the operability of throttling valve is very high, regulates to get up to waste time and energy, and writes down P after regulating respectively
1With P
2Data, the record finish after again at next P
1Data readjust two throttling valve.Therefore obtain one group of P
1With P
2Data often need expensive time and manpower.Afterwards along with the continuous progress of computing machine and automatic technology, tensimeter among Fig. 4 is replaced by pressure transducer, utilizes computer program to write down each data automatically, and efficient increases, but the adjusting of throttling valve still needs manually or partly manually carries out, and efficiency ratio is lower.
Summary of the invention
The object of the present invention is to provide a kind of weight feed formula electronic control pressure reducing device, utilize decompressor characteristic test system and the decompressor characteristic automatic test method of this weight feed formula electronic control pressure reducing device as controlling object.The manual operation of regulating the complexity of tested decompressor inlet pressure in the current decompression device attribute testing process is improved to by computer-controlled automatic adjusting, has higher automatization level, a large amount of time and manpower can be saved, and accurate more test figure can be obtained.
Technical scheme of the present invention is: develop the weight feed formula electronic control pressure reducing device that mouth pressure can Long-distance Control, and be applied to the decompressor attribute testing, connect with tested decompressor, and cooperate parts such as sensor, solenoid valve to form the automatic pilot system of decompressor characteristic, and developed supporting with it decompressor attribute testing software, control the decompressor attribute testing by computer program and carry out automatically, replace manual operation.
Concrete technical scheme is: weight feed formula electronic control pressure reducing device, utilize quantitatively to charge and discharge the adjusting that principle realizes control chamber pressure, and it is quantitatively inflated or venting to control chamber by the Push And Release of two solenoid valves, thereby changes the decompressor top hole pressure.The Push And Release of two solenoid valves is controlled by computer program, when computing machine sends a pulse signal to the inflation solenoid valve, inflation solenoid valve pulsed is opened once, charge into a certain amount of gas to control chamber, make control chamber pressure raise, send pulse signal to the inflation solenoid valve continuously, control chamber pressure raises gradually.Same, when computing machine sends a pulse signal to pressure-releasing electromagnetic valve, the pressure-releasing electromagnetic valve pulsed is opened once, makes control chamber pressure reduce, and send pulse signal to pressure-releasing electromagnetic valve continuously, makes cavity pressure and reduces gradually.
The automatic pilot system of decompressor characteristic places tested decompressor upstream with a weight feed formula electronic control pressure reducing device, and the top hole pressure of weight feed formula electronic control pressure reducing device promptly is the inlet pressure P of tested decompressor
1Come Control Flow with orifice plate.With the controlling and driving of a cover switching value control circuit as weight feed formula electronic control pressure reducing device inflation solenoid valve and pressure-releasing electromagnetic valve.With a sets of data collecting device collection and write down tested decompressor inlet pressure P
1, top hole pressure P
2, when test gas temperature and parameter such as gas flow.Carry out data monitoring, valve control, data recording and processing with a cover from dynamic test software.
The automatic test method of decompressor characteristic, when carrying out static characteristic test, the inlet pressure P of pre-set one group of tested decompressor
1Value, computing machine reads first P automatically after on-test
1Value, and control weight feed formula electronic control pressure reducing device is adjusted to P with its top hole pressure
1Value is worked as P
1Stable back record P
1With P
2Value, computing machine reads second P automatically then
1Value continues to regulate weight feed formula electronic control pressure reducing device top hole pressure to the second P
1Value and record data so go down up to last data of record, thereby obtain one group of P
1With P
2Value, promptly be the static characteristics of tested decompressor.Whole process is all finished automatically by computing machine, without any need for manual operations, has higher automatization level.Foundation needed to generate data sheet and family curve after test was finished.When carrying out dynamic characteristic test, the inlet pressure of pre-set tested decompressor, after on-test, software controlled electronic control pressure reducing device adjusts mouth pressure to the P that sets
1Value afterwards according to the open and close of the sequential control system valve that weaves in advance, writes down and shows the top hole pressure P of tested decompressor simultaneously
2, the curve that obtains promptly is that tested decompressor is P in inlet pressure
1The time dynamic characteristic.
The invention has the beneficial effects as follows: realized the robotization of decompressor attribute testing, process of the test is all moved automatically by computer program control pilot system, has removed complicated manual operation from, has saved manpower and time, improve work efficiency, also can obtain accurate more test figure.And do not need artificial execute-in-place, improved the security of high pressure such as hydrogen, high risk gas test.
Description of drawings
Fig. 1 is a decompressor principle of work synoptic diagram;
Fig. 2 is the typical application system of decompressor;
Fig. 3 is the typical static family curve of decompressor;
Fig. 4 is the typical dynamic characteristics curve of decompressor;
Fig. 5 is the conventional pressure reducer characteristic test system;
Fig. 6 is the automatic pilot system of decompressor characteristic:
Fig. 7 is a weight feed formula electronic control pressure reducing device structure principle chart;
Fig. 8 is the partial enlarged drawing of weight feed formula electronic control pressure reducing device inflation spool and venting spool;
Fig. 9 is a weight feed formula electronic control pressure reducing device gas replenishment process partial enlarged drawing;
Figure 10 is a weight feed formula electronic control pressure reducing device deflation course partial enlarged drawing;
Figure 11 is data acquisition and control circuit;
Figure 12 is the control box guidance panel.
Embodiment
The automatic pilot system of decompressor characteristic is made up of air supply system, data acquisition and control circuit, control program three parts.
The air supply system principle as shown in Figure 6, there is pressure-air in the gas-holder 11, high pressure hand valve 16 is master switchs of source of the gas, and weight feed formula electronic control pressure reducing device 21 is arranged in tested decompressor 13 upstreams, and pressure transducer 12,14 is used for measuring the inlet pressure P of tested decompressor respectively
1With top hole pressure P
2, temperature sensor 22 is used for measuring air themperature, and flowmeter 23 is used for measuring air mass flow, and choke block 24 is used for the limit air flow, and solenoid valve 15 is system switchings.The inlet pressure P of tested decompressor 13
1Be the top hole pressure of weight feed formula electronic control pressure reducing device 21, control by weight feed formula electronic control pressure reducing device.
Weight feed formula electronic control pressure reducing device, as shown in Figure 7, pressure-air enters into high pressure chest 46 by high pressure entry 49.Air in the low-pressure cavity 43 enters into spring cavity 48 by inclined hole 51.In off position down, the main spring of installing in the spring cavity 48 47 acts on main valve plug 41, makes main valve plug tightly be fitted on the main valve seat 45, and the sealing function of the encapsulant 50 on the main valve plug 41 separates high pressure chest 46 and low-pressure cavity 43.Air in the high pressure chest 46 enters into quantitative inflatable chamber 38 by high pressure pod apertures 42, and under the effect of air feed spring 39, air feed spool 37 fits tightly with piston 40, and quantitative inflatable chamber 38 is separated with control chamber 36.Air in the control chamber 36 enters into quantitative air discharge cavity 30 by low pressure pod apertures 33, and under 31 effects of venting spring, venting spool 29 fits tightly with housing 28, and quantitative air discharge cavity 30 is separated with atmospheric environment.
The structure of air feed spool 37 is equipped with the seal made from nonmetal encapsulant 52 and 54 as shown in Figure 8 on the spool matrix 53 that stainless steel is made.The structure of venting spool 29 is identical with air feed spool 37 structures.
If will improve weight feed formula electronic control pressure reducing device top hole pressure, then give the air feed solenoid 34 energisings, air feed armature 35 moves downward, promoting air feed spool 37 moves down and fits tightly with main valve plug 41, as shown in Figure 9, this makes quantitative inflatable chamber 38 and high pressure pod apertures 42 isolate, and quantitatively inflatable chamber 38 is communicated with control chamber 36, quantitatively gases at high pressure in the inflatable chamber 38 and the low-pressure gas in the control chamber 36 merge, thereby improve control chamber pressure by a small margin, and then promotion piston 40 moves downward, piston drives main valve plug 41 and moves downward, and makes that the aperture between main valve plug 41 and the valve seat 45 increases, thereby improves the pressure of low-pressure cavity 43, the pressure of low-pressure cavity acts on piston 40, and piston 40 rebulids balance under the pressure acting in conjunction of the pressure of control chamber 36 and low-pressure cavity 43.With 34 outages of air feed solenoid, air feed spool 37 moves upward under the effect of air feed spring 39, again fit with piston 40, quantitative inflatable chamber 38 is separated with control chamber 36, and be communicated with high pressure chest 46 by high pressure pod apertures 42, so just finished gas replenishment process one time, made the decompressor top hole pressure improve certain level.Supply with pulse signal to air feed solenoid 34 continuously, the decompressor top hole pressure can continue to raise.
If will reduce the decompressor top hole pressure, then give the venting solenoid 25 energisings, venting armature 26 is to left movement, promote venting spool 29 and fit tightly to left movement and with venting valve seat 32, as shown in figure 10, at this moment, quantitatively air discharge cavity 30 is isolated with control chamber 36, communicates with atmospheric environment by through hole 27.The solenoid 25 of will exitting cuts off the power supply, venting armature 26 moves right, the spool 29 of exitting this moment moves right under the effect of venting spring 31, and fit tightly with housing 28, this moment quantitatively air discharge cavity 30 once more with atmospheric isolation, and communicate with control chamber 36 by low pressure pod apertures 33, replenish air in the control chamber 36 is to quantitative air discharge cavity 30, thereby the air pressure of control chamber 36 reduces certain level, piston 40 drives spool 41 and moves upward under the effect of low-pressure cavity 43 and control chamber 36 pressure reduction, the aperture of spool 41 with valve seat 45 reduced, thereby reduce the pressure of low-pressure cavity 43, up to the pressure of the pressure of low-pressure cavity 43 and control chamber 36 balance again, this has just finished deflation course one time, makes the decompressor top hole pressure reduce certain level.Supply with pulse signal to venting solenoid 25 continuously, the decompressor top hole pressure can continue to reduce.
Data acquisition and control circuit, as shown in figure 11,61～68 is 8 tunnel collection ports, the direct current signal of 4～20mA of the generation of sensor is through these 8 ports, enter power distribution isolator array 60, power distribution isolator is used for powering to sensor on the one hand, the Signal Spacing arrangement of on the other hand sensor being sent here, with the arrangement after direct current signal through a conditioning array 59 of forming by the biasing resistor of 8 250 Ω, convert the voltage signal of 1～5V to, collected by capture card 57, and be transported to computing machine by USB port 56.24V direct supply 58 is as the input power supply of distribution isolated array 60.After steering order is sent by computing machine, drive digital signal that is about 3.5V of capture card 57 outputs by USB port 56, this level generates a control signal that is about 27V after amplifying through Darlington transistor array 72, outputs to control end (solenoid valve) through port 69 or 70.27V direct supply 55 is as the input power supply of Darlington transistor array 71.Whole data collection and control circuit are integrated in the control box, and the control box panel as shown in figure 12.
Control program is the action pane of this system, is used for setting test parameters, demonstration and record test figure.
When carrying out static characteristic test, by the inlet pressure P of the pre-set one group of tested decompressor of control program
1Value, Automatic Program reads first P after on-test
1Be worth, and gather the top hole pressure (promptly being the inlet pressure of tested decompressor) of current weight feed formula electronic control pressure reducing device, if current pressure is greater than P
1, then export a steering order, after this instruction was amplified by control circuit, the pressure-releasing electromagnetic valve switch of control weight feed formula electronic control pressure reducing device once made current pressure reduce certain level.Similar, if current pressure is less than the P that sets
1, the inflation electromagnetic valve switch of then controlling weight feed formula electronic control pressure reducing device once makes its top hole pressure improve certain level.And so forth, up to weight feed formula electronic control pressure reducing device its top hole pressure is adjusted to P
1Value is worked as P
1Stable back record P
1With P
2Value, computing machine reads second P automatically then
1Value continues to regulate weight feed formula electronic control pressure reducing device top hole pressure to two P
1Value and record data so go down up to last data of record, thereby obtain one group of P
1With P
2Value, promptly be the static characteristics of tested decompressor.Whole process is all finished automatically by computing machine, without any need for manual operations, has higher automatization level.Foundation needed to generate data sheet and family curve after test was finished.
When carrying out dynamic characteristic test, the inlet pressure of pre-set tested decompressor, after on-test, computer controlled automatic electronic control pressure reducing device adjusts mouth pressure to the P that sets
1Value afterwards according to the open and close of the sequential control system valve that weaves in advance, writes down and shows the top hole pressure P of tested decompressor simultaneously
2, the curve that obtains promptly is that tested decompressor is P in inlet pressure
1The time dynamic characteristic.
Claims (10)
1. weight feed formula electronic control pressure reducing device, comprise: high pressure chest (46), low-pressure cavity (43), control chamber (36), main valve plug (41), valve seat (45), piston (40), have pressurized gas inlet (49) at the high pressure chest sidewall, have low-pressure gas outlet (44) at the low-pressure cavity sidewall, main valve plug is provided with seal element (50), compressed spring (47) in the spring cavity of the lower end of main valve plug, by the sealing surface of change main valve plug seal element and the gaseous tension in the gap adjustment low-pressure cavity between the valve seat, realize adjusting to the decompressor top hole pressure; It is characterized in that: this weight feed formula electronic control pressure reducing device also comprises quantitative aerating device and quantitative means of deflation, wherein quantitative aerating device is by quantitative inflatable chamber (38), air feed spring (39), air feed spool (37), air feed armature (35), air feed solenoid (34) is formed, on main valve plug, be processed with the high pressure pod apertures (42) that is communicated with high pressure chest (46) and quantitative inflatable chamber (38), quantitatively means of deflation is by quantitative air discharge cavity (30), venting spool (29), housing (28), venting spring (31), venting valve seat (32), venting solenoid (25), venting armature (26) is formed, on the venting spool, be processed with low pressure pod apertures (33), be processed with through hole (27) on the housing (28).
2. weight feed formula electronic control pressure reducing device according to claim 1 is characterized in that: air feed spool (37) and venting spool (29) are by seal (52) and (54) that nonmetal encapsulant is made all are installed.
3. weight feed formula electronic control pressure reducing device according to claim 1 is characterized in that: quantitatively have the through hole (27) that communicates with ambient atmosphere on the housing (28) of means of deflation.
4. weight feed formula electronic control pressure reducing device according to claim 1, it is characterized in that: quantitatively inflatable chamber and quantitative air discharge cavity raise with quantitative inflation, quantitative mode of exitting or reduce control chamber pressure, inflation and venting are respectively by air feed solenoid and venting solenoid controlled, and the control signal of solenoid is an impulse form.
5. decompressor characteristic test system, form by air supply system, data acquisition and control circuit, control program three parts, air supply system comprises gas-holder (11), high pressure hand valve (16), tested decompressor (13), pressure transducer (12,14), temperature sensor (22), flowmeter (23), choke block (24), solenoid valve (15), gas-holder stores pressure-air in (11), high pressure hand valve (16) is the master switch of source of the gas, and pressure transducer (12,14) is measured the inlet pressure P of tested decompressor respectively
1With top hole pressure P
2Temperature sensor (22) is used for measuring air themperature, flowmeter (23) is used for measuring air mass flow, choke block (24) is used for the limit air flow, solenoid valve (15) is a system switching, it is characterized in that: be equipped with above-mentioned weight feed formula electronic control pressure reducing device (21) in tested decompressor (13) provided upstream.
6. decompressor characteristic test system, form by air supply system, data acquisition and control circuit, control program three parts, it is characterized in that: data acquisition and control circuit comprise that 8 the tunnel gather port (61～68), power distribution isolator array (60), conditioning array (59), capture card (57), USB port (56), 24V direct supply (58), 27V direct supply (55), Darlington transistor array (71), output port (69,70); The direct current signal of 4～20mA of the generation of pressure transducer is gathered port through above-mentioned 8 the tunnel, enter power distribution isolator array (60), power distribution isolator is used for powering to sensor on the one hand, the Signal Spacing arrangement of on the other hand sensor being sent here, direct current signal after the arrangement is nursed one's health array (59) through one, convert the voltage signal of 1～5V to, voltage signal is collected by capture card (57), and be transported to computing machine by USB port (56), computing machine sends steering order as calculated, drive digital signal that is about 3.5V of capture card (57) output by USB port (56), after this level amplifies through Darlington transistor array (71), generate a control signal that is about 27V, output to control end (solenoid valve) through port (69) or (70).
7. decompressor characteristic test system according to claim 6 is characterized in that: 24V direct supply (58) is as the input power supply of distribution isolated array (60), and conditioning array (59) is made up of the biasing resistor of 8 250 Ω.
8. decompressor characteristic test system according to claim 6 is characterized in that: whole data collection and control circuit are integrated in the control box.
9. the automatic test method of decompressor characteristic is characterized in that: the inlet pressure P of pre-set one group of tested decompressor
1Value, and in the input computer software; Computing machine reads first P automatically
1Value, with impulse form control weight feed formula electronic control pressure reducing device (21), its top hole pressure is adjusted to P by control circuit
1Value is worked as P
1Stable back record P
1With P
2Value; Computing machine reads second P automatically
1Value continues to regulate weight feed formula electronic control pressure reducing device top hole pressure to two P with impulse form
1Value and record P
1With P
2Value; So go down up to last data of record, thereby obtain a series of P
1With P
2Value; Computing machine automatically generated data form and family curve after test is finished promptly are the static characteristicss of tested decompressor.
10. the automatic test method of decompressor characteristic is characterized in that: the inlet pressure of pre-set tested decompressor, and in the input computer software; Computer controlled automatic electronic control pressure reducing device adjusts mouth pressure to the P that sets
1Value; According to the open and close of the sequential control system valve that weaves in advance, and by data acquisition and control circuit record with show the top hole pressure P of tested decompressor
2Over time, the curve that obtains promptly is that tested decompressor is P in inlet pressure
1The time dynamic characteristic.
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|---|---|---|---|
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|---|---|---|---|
| CN200810224753A CN101769824A (en) | 2008-12-29 | 2008-12-29 | Quantitative feed electric control pressure reductor, characteristic test system for pressure reductor and automatic test method |
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| CN104047783A (en) * | 2014-06-16 | 2014-09-17 | 北京航空航天大学 | Piezoelectric crystal fuel oil injector and injection control method thereof |
| CN105637440A (en) * | 2013-12-18 | 2016-06-01 | 格拉默股份有限公司 | Pressure reducer |
| CN110411519A (en) * | 2019-09-04 | 2019-11-05 | 上海乐研电气有限公司 | A kind of device and monitoring system of on-line monitoring gas micro water content |
| CN110658033A (en) * | 2018-06-29 | 2020-01-07 | 通用电气公司 | Pressure reduction system and method for reducing pressure of high pressure aerosols |
| CN112387767A (en) * | 2020-10-28 | 2021-02-23 | 钟乙茗 | Soil thermal analysis repairing equipment |
| CN114151391A (en) * | 2021-12-14 | 2022-03-08 | 青州海盾液压机械有限公司 | Energy-saving digital hydraulic system and use method thereof |
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2008
- 2008-12-29 CN CN200810224753A patent/CN101769824A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105637440A (en) * | 2013-12-18 | 2016-06-01 | 格拉默股份有限公司 | Pressure reducer |
| US10025324B2 (en) | 2013-12-18 | 2018-07-17 | Grammer Ag | Pressure reducer |
| CN104047783A (en) * | 2014-06-16 | 2014-09-17 | 北京航空航天大学 | Piezoelectric crystal fuel oil injector and injection control method thereof |
| CN104047783B (en) * | 2014-06-16 | 2017-05-31 | 北京航空航天大学 | A kind of piezo-electric crystal fuel injector and its ejection control method |
| CN110658033A (en) * | 2018-06-29 | 2020-01-07 | 通用电气公司 | Pressure reduction system and method for reducing pressure of high pressure aerosols |
| CN110658033B (en) * | 2018-06-29 | 2022-06-21 | 通用电气公司 | Pressure reduction system and method for reducing pressure of high pressure aerosols |
| CN110411519A (en) * | 2019-09-04 | 2019-11-05 | 上海乐研电气有限公司 | A kind of device and monitoring system of on-line monitoring gas micro water content |
| CN110411519B (en) * | 2019-09-04 | 2024-05-10 | 上海乐研电气有限公司 | Device and monitoring system for on-line monitoring gas micro-water content |
| CN112387767A (en) * | 2020-10-28 | 2021-02-23 | 钟乙茗 | Soil thermal analysis repairing equipment |
| CN114151391A (en) * | 2021-12-14 | 2022-03-08 | 青州海盾液压机械有限公司 | Energy-saving digital hydraulic system and use method thereof |
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