CN209180161U - A kind of aircraft hydraulic pressure of pipe line oil leakage simulator stand - Google Patents
A kind of aircraft hydraulic pressure of pipe line oil leakage simulator stand Download PDFInfo
- Publication number
- CN209180161U CN209180161U CN201822221700.XU CN201822221700U CN209180161U CN 209180161 U CN209180161 U CN 209180161U CN 201822221700 U CN201822221700 U CN 201822221700U CN 209180161 U CN209180161 U CN 209180161U
- Authority
- CN
- China
- Prior art keywords
- pressure
- oil
- valve
- piping connection
- pipe line
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Examining Or Testing Airtightness (AREA)
Abstract
The utility model discloses a kind of aircraft hydraulic pressure of pipe line oil to leak simulator stand, is related to aircraft safety technical field.It is circuit that oil sources described in the utility model, hydraulic system and leakage line, which pass sequentially through piping connection,；The hydraulic system includes the plunger pump with oil sources piping connection, respectively with the check valve, overflow valve and relief valve of plunger pump piping connection, the first flowmeter and safety valve being connect with check valve, the second flowmeter being connect with leakage line one end, the proportional reversing valve being connect with second flowmeter；The overflow valve and relief valve, safety valve, proportional reversing valve pass through piping connection with oil sources respectively；The connection of the other end of the first flowmeter and leakage line.The utility model can simulate aircraft the pipeline leakage of Leakage Energy and combustion case under different leak pressures, leak time, have the characteristics that principle is simple, safe and reliable and applicability is extensive.
Description
Technical field
The utility model relates to aircraft safety technical fields, and in particular to a kind of aircraft hydraulic pressure of pipe line oil leakage simulation test
Platform.
Background technique
Hydraulic system is the important energy source system on aircraft, and original part, pipeline are distributed in the major region of aircraft.And mainstream flies
Hydraulic system on machine is driven using hydraulic oil, hydraulic fluid leak easily occurs, if be very dangerous there is also incendiary source.
Therefore simulation is carried out to aircraft hydraulic pressure of pipe line oil leakage situation at different conditions and its combustion case and analysis is that have very much must
It wants.
Simulator stand is widely used in many important engineering fields as crucial experimental assembly to realize really
Environmental simulation can be used to simulate the combustion case of the Leakage Energy of aircraft pipeline at different conditions, determine not in the lab
Influence with experiment condition to leakage hydraulic oil combustion case.Simulator stand is leaked by aircraft hydraulic pressure of pipe line oil, not only may be used
To analyze and research to combustion case of the aircraft pipeline leakage oil under the conditions of different leak pressures, different leakage rates, may be used also
To save a large amount of financial resource and material resource.Therefore design aircraft hydraulic pressure of pipe line oil leakage simulator stand and determine corresponding testing program at
For the task of top priority.
Currently, it is seldom that the testing stand simulated can be leaked aircraft hydraulic pressure of pipe line oil, and can accurately control leakage
The pipeline leakage oil simulator stand of pressure and leak time almost without.How under different leak conditions, to airplane hydraulic pressure
The leakage of pipeline and combustion case are simulated, and are of great significance.
Utility model content
The utility model aim is to provide a kind of aircraft hydraulic pressure of pipe line oil leakage simulator stand, it is intended to can be to aircraft
Pipeline combustion case of Leakage Energy under different leak pressures and leak time is simulated.
To achieve the above object, following technical scheme is used: a kind of aircraft hydraulic pressure of pipe line oil leakage simulator stand,
It is characterized in that, including oil sources, hydraulic system and leakage line；The oil sources, hydraulic system and leakage line pass sequentially through
Piping connection is circuit；The hydraulic system includes the plunger pump of oil inlet Yu oil sources piping connection, fuel-displaced with plunger pump respectively
Check valve, overflow valve and the relief valve of mouthful piping connection, respectively with the first flowmeter of check valve other end piping connection with
And safety valve, the second flowmeter connecting with leakage line one end commutate with the ratio of second flowmeter other end piping connection
Valve；The overflow valve and relief valve, safety valve, proportional reversing valve pass through piping connection with oil sources respectively；The first flow
The other end of meter and the other end of leakage line connect.
A further technical solution lies in further include control device.
A further technical solution lies in the oil sources is equipped with cooling circuit, and the cooling circuit includes passing through with oil sources
The gear pump of piping connection, and the cooler for passing through piping connection with the gear pump other end；The other end of the cooler with
Oil sources passes through piping connection.
A further technical solution lies in the oil sources is equipped with heater.
A further technical solution lies in the oil sources is equipped with temperature transmitter；The temperature transmitter and control device
Electrical connection；Signal control heater operation of the control device according to temperature transmitter transmitting, or control motor-driven gear
Pump operation.
A further technical solution lies in the hydraulic system is equipped with first connect with plunger pump liquid pressure oil export pipeline
Pressure gauge；With the second pressure gauge of check valve hydraulic oil outlet piping connection.
A further technical solution lies in the relief valve is Solenoid ball valve；The hydraulic system is equipped with and plunger pump liquid
The first pressure sensor of pressure oil export pipeline connection；Signal control of the control device according to first pressure sensor transmitting
Solenoid ball valve pressure release movement.
A further technical solution lies in the hydraulic system is equipped with second with check valve hydraulic oil outlet piping connection
Pressure sensor；Signal control proportional reversing valve pressure control movement of the control device according to second pressure sensor passes.
A further technical solution lies in signal control heater fortune of the control device according to temperature sensor transmitting
Row, or control motor-driven gear pump operation；The temperature sensor and check valve hydraulic oil outlet piping connection.
A further technical solution lies in be arranged high pressure filter between the plunger pump and check valve piping connection.
A further technical solution lies in the first pressure gauge passes sequentially through the first survey pressure hose, the first pressure measuring tie-in
It is connect with plunger pump liquid pressure oil export pipeline；The second pressure gauge pass sequentially through the second survey pressure hose, the second pressure measuring tie-in with
Check valve hydraulic oil outlet piping connection.
Compared with prior art, the utility model has the following beneficial effects:
The utility model can simulate the leakage and burning of aircraft pipeline Leakage Energy under different leak pressures, leak time
Situation, and the leakage rate of Leakage Energy can measure.SERVO CONTROL is used simultaneously, and it is high that control precision can be improved.And there is principle
Simply, securely and reliably and the features such as applicability is extensive.
Detailed description of the invention
Fig. 1 is that aircraft hydraulic pressure of pipe line oil leaks simulated experiment platform hydraulic system principle figure；
1.1, normally closed cut-off valve；1.2, the first normally opened shut-off valve；1.3, the second normally opened shut-off valve；2, fuel tank；3, cooler；
4, gear pump；5, motor；6.1, primary heater；6.2, secondary heater；7, fluid level transmitter；8, liquid level relay；9, warm
Spend transmitter；10, air filter；11, plunger pump；12, driving motor；13, high pressure filter；14, overflow valve；15, electromagnetism
Ball valve；16, check valve；17, first pressure sensor；18.1, the first pressure measuring tie-in；18.2, the second pressure measuring tie-in；19.1,
One surveys pressure hose；19.2, second pressure hose is surveyed；20.1, first pressure gauge；20.2 second pressure gauges；21, safety valve；22, accumulation of energy
Device；23, temperature sensor；24, second pressure sensor；25.1, first flowmeter；25.2, second flowmeter；26, blow-by tube
Road；27, proportional reversing valve；
Specific embodiment
The utility model is described further with reference to the accompanying drawing:
As shown, the utility model elaborates a kind of aircraft hydraulic pressure of pipe line oil leakage simulator stand comprising oil sources,
Hydraulic system and leakage line 26；It is circuit that the oil sources, hydraulic system and leakage line 26, which pass sequentially through piping connection,；
The hydraulic system includes the plunger pump 11 of oil inlet Yu oil sources piping connection, respectively with 11 oil outlet piping connection of plunger pump
Check valve 16, overflow valve 14 and relief valve, respectively with the first flowmeter 25.1 of 16 other end piping connection of check valve and
Safety valve 21, the second flowmeter 25.2 being connect with 26 one end of leakage line, with 25.2 other end piping connection of second flowmeter
Proportional reversing valve 27；The overflow valve 14 and relief valve 15, safety valve 21, proportional reversing valve 27 pass through with oil sources respectively
Piping connection；The other end of the first flowmeter 25.1 is connect with the other end of leakage line 26.
It further include control device in the preferred embodiment in the utility model.
In the preferred embodiment in the utility model, the oil sources is equipped with cooling circuit, and the cooling circuit includes logical with oil sources
The gear pump 4 of piping connection is crossed, and passes through the cooler 3 of piping connection with 4 other end of gear pump；The cooler 3 is another
End passes through piping connection with oil sources.
In the preferred embodiment in the utility model, the oil sources is equipped with heater.
In the preferred embodiment in the utility model, the oil sources is equipped with temperature transmitter 9；The temperature transmitter 9 and control
Device electrical connection；The signal control heater operation that the control device is transmitted according to temperature transmitter 9, or control motor 5 drive
Movable tooth wheel pump 4 is run.
In the preferred embodiment in the utility model, the hydraulic system is equipped with and 11 hydraulic oil outlet piping connection of plunger pump
First pressure gauge 20.1；With the second pressure gauge 20.2 of check valve hydraulic oil outlet piping connection.
In the preferred embodiment in the utility model, the relief valve is Solenoid ball valve 15；The hydraulic system is equipped with and plunger
Pump the first pressure sensor 17 of 11 hydraulic oil outlet piping connections；The control device is transmitted according to first pressure sensor 17
Signal control 15 pressure release of Solenoid ball valve movement.
In the preferred embodiment in the utility model, the hydraulic system is equipped with and 16 hydraulic oil outlet piping connection of check valve
Second pressure sensor 24；The control device is controlled according to the signal control proportional reversing valve 27 that second pressure sensor 24 transmits
Press work.
In the preferred embodiment in the utility model, the control device controls heating according to the signal that temperature sensor 23 transmits
Device operation, or control motor 5 drive gear pump 4 to run；The temperature sensor 23 connects with 16 hydraulic oil outlet pipeline of check valve
It connects.
In the preferred embodiment in the utility model, high-pressure filteration is set between 16 piping connection of the plunger pump 11 and check valve
Device 13.
In the preferred embodiment in the utility model, the first pressure gauge 20.1 passes sequentially through the first survey pressure hose 19.1, the
One pressure measuring tie-in 18.1 and 11 hydraulic oil outlet piping connection of plunger pump；The second pressure gauge 20.2 passes sequentially through the second survey pressure
Hose 19.2, the second pressure measuring tie-in 18.2 and 16 hydraulic oil outlet piping connection of check valve.
In the preferred embodiment in the utility model, the oil sources is fuel tank 2.
In the preferred embodiment in the utility model, the heater includes primary heater 6.1 and secondary heater 6.2.
In the preferred embodiment in the utility model, normally closed cut-off valve 1.1 is arranged in 2 place of being in communication with the outside of fuel tank.
In the preferred embodiment in the utility model, line connection is arranged first normally opened section between the fuel tank 2 and gear pump 4
Only valve 1.2.
In the preferred embodiment in the utility model, line connection setting second is normally opened between the fuel tank 2 and plunger pump 11
Shut-off valve 1.3.
In the preferred embodiment in the utility model, line connection is arranged between the plunger pump 1.1 and high pressure filter 13
Hose.
In the preferred embodiment in the utility model, the control device is PLC or single-chip microcontroller or commercial PC machine.
In the preferred embodiment in the utility model, the plunger pump is driven by driving motor.
In the preferred embodiment in the utility model, the safety valve is also connected with accumulator 22.
Embodiment
This testing stand includes oil sources, hydraulic system and leakage line 26.
Wherein, plunger pump 11, which is mainly responsible for, provides the hydraulic oil of certain pressure and flow for hydraulic system；Driving motor 12
It is responsible for driving plunger pump 11；Normally closed cut-off valve 1.1 prevents the hydraulic oil in fuel tank 2 from flowing out when closing, the first normally opened shut-off valve
1.2, hydraulic oil can be allowed normally to flow out when the second normally opened shut-off valve 1.3 is opened；13 pairs of high pressure filter enter hydraulic system
High pressure oil carries out refined filtration, prevents the critical components such as proportional reversing valve 27, first flowmeter 25.1, second flowmeter 25.2 from blocking；
The adjustable hydraulic system highest output pressure of overflow valve 14；15 left position of Solenoid ball valve can be realized unloading for hydraulic system when connecting
Lotus decompression function, and when system jam, it can be realized emergency stop；Check valve 16 is located at the outlet of plunger pump 11, can be with
Prevent oil liquid from flowing backward back plunger pump 11；First pressure gauge 20.1 surveys pressure hose 19.1 and the first pressure measuring tie-in 18.1 by first
It is connected with the outlet of plunger pump 11, first pressure gauge 20.1, second pressure gauge 20.2 can be intuitively displayed out hydraulic system output pressure
Power；The pressure feedback that first pressure sensor 17 can export plunger pump 11 is to control device；Accumulator 22 and 21 groups of safety valve
At the safe valve group of accumulator, Research of Pressure Ripple for Hydraulic Systems can be absorbed；Fluid level transmitter 7 and liquid level relay 8 can be in 2 oil of fuel tank
Liquid is reduced to setting minimum, is fed back to control device, and alarm by the control of control device, is prompted for fuel tank 2
Supplement oil liquid；Temperature transmitter 9 can acquire 2 temperature of fuel tank, and feed back to control device；Primary heater 6.1, second heats
Device 6.2 is responsible for heating oil liquid；Motor 5 drives gear pump 4 to carry out independent loops to oil liquid in cooling circuit, and utilizes cooler 3
Oil liquid is cooled down.
Temperature sensor 23 can measure leakage oil liquid temperature, cooperation primary heater 6.1, secondary heater 6.2 and cold
But device 3 realize the feedback compensation of leakage oil liquid temperature by the control of control device, and oil liquid is made to be maintained at suitable work temperature
Degree；Pressure sensor 24 can measure leakage line oil liquid pressure, and by pressure feedback to control device；Proportional reversing valve 27 is
The closed-loop control of leak pressure is completed in the core element of Leakage Energy pressure closed loop control, the instruction of receiving control device；It is first-class
Meter 25.1, second flowmeter 25.2 can measure the flow for flowing through leakage line 26, and the leakage flow of leakage line 26 can be by
Two flowmeter differences obtain.
The control device of experimental bench is made of monitoring unit, real-time control computer, signal conditioning unit etc. herein.Prison
Control unit is in control system top layer, therefore also referred to as host computer, it is Tianwan businessman's PC machine, runs monitoring software thereon,
Belong to task management layer, for monitoring the working condition of hydraulic fluid leak simulated experiment platform, receiving the control instruction of operator,
It controls experimental bench and completes experimental duties.Real-time control computer is in the lower layer of control system, therefore also referred to as slave computer, it is
One industrial control unit (ICU), runs real-time control software thereon, and control instruction is sent to ratio by real-time control computer and is driven
Dynamic device, ratio driver further controls proportional reversing valve spool displacement, while the first, second pressure sensor will be collected
Actual pressure at leakage line feeds back to real-time control computer, and real-time control computer is according to desired leak pressure and reality
The difference of leak pressure drives proportional reversing valve valve core movement, adjusting spool openings of sizes, to realize the real-time of leakage line
Pressure closed loop control.Monitoring unit carries out information transmitting by Ethernet and real-time control computer.Signal conditioning unit is by adjusting
Manage case and corresponding connection circuit composition, mainly to the collected signal of control instruction and sensor for being sent to ratio driver into
Row pretreatment and signal normalization.
Igniter uses ignition, is located at the leakage hole of leakage line at igniting, igniter is using calculating
Machine control, and trigger button is equipped in upper computer software.When leak pressure is transferred to user specified value, user can click igniting
Trigger button carries out igniting experiments.
The experimental method of aircraft hydraulic pressure of pipe line oil leakage simulation:
(1) user starts testing stand driving motor first in upper computer software, in conjunction at outlet of plunger pump first
The feedback pressure force value of pressure sensor, regulation relief valve make hydraulic system pressure reach designated value.
(2) user inputs desired leak time and leak pressure in upper computer software.The desired leak pressure ginseng
Number is transferred to real-time control computer by Ethernet, while second pressure sensor feeds back the actual pressure at leakage line
To real-time control computer, real-time control computer passes through closed loop according to the difference of desired leak pressure and practical leak pressure
It controls to adjust the valve core opening size of proportional reversing valve, pressure at hydraulic fluid leak simulated experiment platform Leakage Energy is enable to reach
Desired leak pressure.When reaching desired leak time, slave computer controls Solenoid ball valve left position and connects, and unloads system
Lotus, leakage line can stop draining.
(3) during oil liquid leakage, by triggering igniter, realization lights a fire to Leakage Energy.
Above-described is only that preferred embodiments of the present invention are described, not to the model of the utility model
It encloses and is defined, under the premise of not departing from the spirit of the design of the utility model, those of ordinary skill in the art are to the utility model
The various changes and improvements made of technical solution, should all fall into the protection scope that the utility model claims book determines.
Claims (10)
1. a kind of aircraft hydraulic pressure of pipe line oil leaks simulator stand, which is characterized in that including oil sources, hydraulic system and blow-by tube
Road；It is circuit that the oil sources, hydraulic system and leakage line, which pass sequentially through piping connection,；The hydraulic system includes oil inlet
Divide with the plunger pump of oil sources piping connection respectively with check valve, overflow valve and the relief valve of plunger pump oil outlet piping connection
Not with the first flowmeter and safety valve of check valve other end piping connection, the second flow being connect with leakage line one end
Meter, the proportional reversing valve with second flowmeter other end piping connection；The overflow valve and relief valve, safety valve, ratio are changed
Pass through piping connection with oil sources respectively to valve；The other end of the first flowmeter and the other end of leakage line connect.
2. a kind of aircraft hydraulic pressure of pipe line oil according to claim 1 leaks simulator stand, which is characterized in that the oil sources
Equipped with cooling circuit, the cooling circuit includes the gear pump with oil sources by piping connection, and logical with the gear pump other end
Cross the cooler of piping connection；The other end and oil sources of the cooler pass through piping connection.
3. a kind of aircraft hydraulic pressure of pipe line oil according to claim 1 leaks simulator stand, which is characterized in that the oil sources
Equipped with heater.
4. a kind of aircraft hydraulic pressure of pipe line oil according to claim 2 or 3 leaks simulator stand, which is characterized in that described
Oil sources is equipped with temperature transmitter, and the control device being electrically connected with temperature transmitter；The control device is according to temperature pick-up
The signal control heater operation of device transmitting, or control motor-driven gear pump operation.
5. a kind of aircraft hydraulic pressure of pipe line oil according to claim 1 leaks simulator stand, which is characterized in that described hydraulic
System is equipped with the first pressure gauge connecting with plunger pump liquid pressure oil export pipeline；With the of check valve hydraulic oil outlet piping connection
Two pressure gauges.
6. a kind of aircraft hydraulic pressure of pipe line oil according to claim 1 leaks simulator stand, which is characterized in that further include control
Device processed；The relief valve is Solenoid ball valve；The hydraulic system is equipped with first connect with plunger pump liquid pressure oil export pipeline
Pressure sensor；Signal control Solenoid ball valve pressure release movement of the control device according to first pressure sensor transmitting.
7. a kind of aircraft hydraulic pressure of pipe line oil according to claim 1 leaks simulator stand, which is characterized in that further include control
Device processed；The hydraulic system is equipped with the second pressure sensor with check valve hydraulic oil outlet piping connection；The control dress
Set the signal control proportional reversing valve pressure control movement according to second pressure sensor passes.
8. a kind of aircraft hydraulic pressure of pipe line oil according to claim 4 leaks simulator stand, which is characterized in that the control
Signal control heater operation of the device according to temperature sensor transmitting, or control motor-driven gear pump operation；The temperature
Sensor and check valve hydraulic oil outlet piping connection.
9. a kind of aircraft hydraulic pressure of pipe line oil according to claim 1 leaks simulator stand, which is characterized in that the plunger
High pressure filter is set between pump and check valve piping connection.
10. a kind of aircraft hydraulic pressure of pipe line oil according to claim 5 leaks simulator stand, which is characterized in that described the
One pressure gauge passes sequentially through the first survey pressure hose, the first pressure measuring tie-in is connect with plunger pump liquid pressure oil export pipeline；Described second
Pressure gauge passes sequentially through the second survey pressure hose, the second pressure measuring tie-in and check valve hydraulic oil outlet piping connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822221700.XU CN209180161U (en) | 2018-12-27 | 2018-12-27 | A kind of aircraft hydraulic pressure of pipe line oil leakage simulator stand |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822221700.XU CN209180161U (en) | 2018-12-27 | 2018-12-27 | A kind of aircraft hydraulic pressure of pipe line oil leakage simulator stand |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209180161U true CN209180161U (en) | 2019-07-30 |
Family
ID=67378114
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822221700.XU Active CN209180161U (en) | 2018-12-27 | 2018-12-27 | A kind of aircraft hydraulic pressure of pipe line oil leakage simulator stand |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209180161U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109441911A (en) * | 2018-12-27 | 2019-03-08 | 燕山大学 | A kind of aircraft hydraulic pressure of pipe line oil leakage simulator stand |
| CN111473021A (en) * | 2020-04-10 | 2020-07-31 | 四川益巨交通工程有限责任公司 | Fluid leakage detection method and device |
-
2018
- 2018-12-27 CN CN201822221700.XU patent/CN209180161U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109441911A (en) * | 2018-12-27 | 2019-03-08 | 燕山大学 | A kind of aircraft hydraulic pressure of pipe line oil leakage simulator stand |
| CN109441911B (en) * | 2018-12-27 | 2024-03-26 | 燕山大学 | Hydraulic oil leakage simulation test bed for aircraft pipeline |
| CN111473021A (en) * | 2020-04-10 | 2020-07-31 | 四川益巨交通工程有限责任公司 | Fluid leakage detection method and device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109441911A (en) | A kind of aircraft hydraulic pressure of pipe line oil leakage simulator stand | |
| WO2018041257A1 (en) | Hydraulic system of device for testing comprehensive performance of high-pressure gear flowmeter and testing method | |
| CN209180161U (en) | A kind of aircraft hydraulic pressure of pipe line oil leakage simulator stand | |
| CN106200668A (en) | Outer loop energy resource system and test method thereof for semi-physical simulation | |
| CN208653742U (en) | It is a kind of sealing and the testing integrated machine of pulse | |
| CN105865796A (en) | Oil-inflow and oil-return bi-directional oil consumption measurement device for engine in test room | |
| CN104931266B (en) | A kind of airplane engine fuel oil analog control system and adjusting method | |
| CN109368583A (en) | Urea for vehicle charging machine and its use control method | |
| CN109026484B (en) | Control system of on-line detection platform of automobile air inlet type oil sprayer | |
| CN111075780A (en) | Aircraft fuel pipeline pressure pulsation system and working method thereof | |
| CN106383513A (en) | Gas turbine control system semi-physical simulation test device and verification method | |
| CN112305954A (en) | High-pressure environment simulation test bed and simulation method for detecting buoy buoyancy adjusting system | |
| CN104481971A (en) | Torque-type hydraulic pump and hydraulic motor power recovery test platform | |
| CN102221469B (en) | Comprehensive test bed for vehicle warmer | |
| CN104019075B (en) | Testing system of balance valve | |
| CN207894593U (en) | A kind of multi-way valve pressure-resistant test system | |
| CN112882453A (en) | Fuel system flow resistance test bed based on PLC control and test method thereof | |
| CN112432775A (en) | Hydrogen circulation test device for hydrogen-involved component | |
| CN216386253U (en) | Burning test system | |
| CN209161470U (en) | Urea for vehicle charging machine | |
| EP2623745A2 (en) | Gas turbine engine fuel return valve and system | |
| CN204575323U (en) | High-temperature dynamic testing device for composite perforator unit | |
| CN110953208A (en) | Hydraulic valve fatigue testing method and hydraulic valve fatigue testing device | |
| CN214096558U (en) | Hydrogen circulation test device for hydrogen-involved component | |
| CN212717420U (en) | EH oil supply device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |