CN205898398U - Airtightness detecting device - Google Patents
Airtightness detecting device Download PDFInfo
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- CN205898398U CN205898398U CN201620774783.3U CN201620774783U CN205898398U CN 205898398 U CN205898398 U CN 205898398U CN 201620774783 U CN201620774783 U CN 201620774783U CN 205898398 U CN205898398 U CN 205898398U
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Abstract
The utility model discloses an airtightness detecting device, including first air supply, a pressure sensor and a proportional servo valve, first air supply links to each other through a proportional servo valve with first appearance chamber of treating detecting object, a pressure sensor links to each other with first appearance chamber of treating detecting object for detect the gas tightness that thereby this first detecting object's of treating appearance chamber is judged to the pressure of this first detecting object's of treating appearance intracavity, a pressure sensor still links to each other with a proportional servo valve for adjust a proportional servo valve's state. The utility model discloses an improve airtightness detecting device's loop design etc. Can solve effectively that the degree of accuracy of direct pressure test method is low, the inconvenient problem of differential pressure method of testing operation to does the device adjust through closed loop control system gaseous flow in the return circuit is adjusted to the aperture of gas proportion / servovalve, can effectively detect the gas tightness of system.
Description
Technical field
The utility model belongs to air-leakage test technical field, more particularly, to a kind of air tightness detection apparatus.
Background technology
Airtight detection is the important means weighing many industrial goods sealing properties, particularly in the row such as space flight, aviation, instrument
Industry, airtight detection is that one important and the detection means that frequently uses.Traditional manually airtight detection method intricate operation, work
Intensity is big, simultaneously because artificial origin, easily causes missing inspection and flase drop.Send out with microelectric technique and the continuous of pneumatics
Exhibition, airtight detection method is also improved.At present, the wide airtight detection method direct pressure method of testing of application and differential pressure
Method of testing.Direct pressure method of testing, is the gas being filled with certain pressure into tested container, if there is leakage phenomenon in container,
Then will decline through pressure after a period of time, judge the air-tightness of workpiece according to the size of the pressure change before and after test；
Differential pressure method of testing, is the gas being simultaneously filled with certain pressure into two identical containers, and in two containers, one is standard component,
One is measured piece, by container between differential pressure pick-up measure pressure differential between measured piece and standard component, thus detecting quilt
Survey the air-tightness of workpiece.
Various mistakes in differential pressure method of testing, because measured piece is identical with the structure of standard component, in test process
Difference factor, such as adiabatic factor impact, temperature and vaporization, the impact evaporated etc. can not considered, and differential pressure pick-up
Precision is again relatively higher, such that it is able to detect the air-tightness of measured workpiece exactly.Taking the airtight detection of fuel system as a example, this system
Fuel tank internal have the oil sac of variable volume, the segment pipe being connected with oil sac has throttling action, using direct pressure test
Method detects that the air-tightness of this system has certain error, because what pressure sensor detected is the pipeline being connected with oil sac
Pressure, and gas pass through choke manifold when pressure also can decline, therefore direct pressure method of testing is not suitable for the gas of fuel system
Close detection.Differential pressure method of testing measuring accuracy is higher, but because it is relatively costly, and complex structure, it is not suitable for fuel system yet
Airtight detection.For example, the cavity volume to be measured that differential pressure method of testing is typically suitable for is independent single cavity volume, and fuel system is nested
Two cavity volumes to be measured (that is, oil sac and the fuel tank being nested with this oil sac), need to prepare and part identical to be measured using differential pressure method
Standard component, in mass detection, if saving financial cost, the time cost detecting is higher, inefficiency；If the time of saving
Cost, then the standard component needing is more, and the making detection of standard component but then is also required for cost and time, therefore efficiency
Also not high；Additionally, for different fuel systems, generally requiring to be equipped with different standard components, cause detection inconvenience.Therefore how
Efficiently, simply the air-tightness of detection fuel system becomes problem demanding prompt solution.
Utility model content
Disadvantages described above for prior art or Improvement requirement, the purpose of this utility model is to provide a kind of airtight detection
Device, wherein by improving to crucial air tightness detection apparatus loop design in device etc., compared with prior art can
The effectively solving direct pressure method of testing degree of accuracy is low, the unhandy problem of differential pressure method of testing, and this device and corresponding watch
Taking control method is to adjust the flow of gas in loop by the aperture that closed-loop control system adjusts electric-gas ratio/servo valve,
Effective detection can be carried out to the air-tightness of system.
For achieving the above object, according to one side of the present utility model, there is provided a kind of air tightness detection apparatus, its feature
It is, the first loop be connected including the first source of the gas and with this first source of the gas, wherein,
Described first loop includes first pressure sensor and the first proportional servo valve,
Described first source of the gas is connected by described first proportional servo valve with the cavity volume of the first examined object, and described first
Source of the gas is used for being passed through gas to the cavity volume of described first examined object；This first proportional servo valve is used for switching described first gas
Conducting state between the cavity volume of source and described first examined object, adjusts described first source of the gas to the described first thing to be detected
The flow of the gas that the cavity volume of body is passed through；
Described first pressure sensor is connected with the cavity volume of described first examined object, first to be detected for detecting this
Pressure in the cavity volume of object, the change of the pressure value by detecting in a period of time judges this first examined object
The air-tightness of cavity volume；Described first pressure sensor is also connected with described first proportional servo valve, for adjusting this first ratio
The conducting state of servo valve or off state.
According to another aspect of the present utility model, the utility model provide a kind of air tightness detection apparatus it is characterised in that
The first loop of including the first source of the gas, being connected with this first source of the gas, the second source of the gas and be connected with this second source of the gas second time
Road, wherein,
Described first loop includes first pressure sensor and the first proportional servo valve, and described first source of the gas is to be checked with first
The cavity volume surveying object is connected by described first proportional servo valve, and described first source of the gas is used for described first examined object
Cavity volume is passed through gas；This first proportional servo valve be used for switching described first source of the gas and described first examined object cavity volume it
Between conducting state, adjust the flow of gas that described first source of the gas is passed through to the cavity volume of described first examined object；
Described first pressure sensor is connected with the cavity volume of described first examined object, first to be detected for detecting this
Pressure in the cavity volume of object, the change of the pressure value by detecting in a period of time judges this first examined object
The air-tightness of cavity volume；Described first pressure sensor is also connected with described first proportional servo valve, for adjusting this first ratio
The conducting state of servo valve or off state；
Described second servo loop includes second pressure sensor and the second proportional servo valve, and described second source of the gas is to be checked with second
The cavity volume surveying object is connected by described second proportional servo valve, and the cavity volume that described second source of the gas is used for the second examined object leads to
Enter gas；This second proportional servo valve is used for switching leading between described second source of the gas and the cavity volume of described second examined object
Logical state, adjusts the flow of the gas that described second source of the gas is passed through to the cavity volume of described second examined object；
Described second pressure sensor is connected with the cavity volume of described second examined object, second to be detected for detecting this
Pressure in the cavity volume of object；Described second pressure sensor is also connected with described second proportional servo valve, for adjust this
The conducting state of two proportional servo valves or off state；
Additionally, described first examined object is also wrapped up by described second examined object.
As of the present utility model further preferably, described first loop also includes first comparator, this first comparator
It is connected with described first pressure sensor and described first proportional servo valve respectively, and for according to described first pressure sensor
The pressure value in the cavity volume of described first examined object detecting and the first examined object target pressure pre-setting
Force value, adjustment flows through the flow of the gas of this first proportional servo valve.
As of the present utility model further preferably, described second servo loop also includes the second comparator, this second comparator
It is connected with described second pressure sensor and described second proportional servo valve respectively, and for according to described second pressure sensor
The pressure value in the cavity volume of described second examined object detecting and the second examined object target pressure pre-setting
Force value, adjustment flows through the flow of the gas of this second proportional servo valve.
As of the present utility model further preferably, described first proportional servo valve and described second proportional servo valve are
Electric-gas proportional servo valve.
As of the present utility model further preferably, described first examined object is oil sac, described second thing to be detected
Body is fuel tank.
As of the present utility model further preferably, described first source of the gas and described second source of the gas are same source of the gas.
By the contemplated above technical scheme of the utility model, compared with prior art, due to by closed-loop control system
System controls the aperture of electric-gas ratio/servo valve to carry out the flow of gas in control loop, and the air-tightness of system can be carried out effectively
Detection, is highly suitable for the airtight detection to fuel system；The utility model proposes air tightness detection apparatus and SERVO CONTROL side
Method is different from direct pressure method of testing and differential pressure method of testing, the device taking the airtight detection of fuel system as a example, in the utility model
And method is had the following advantages compared with direct pressure method of testing and differential pressure method of testing:
1. can accurately control tested chamber pressure.Compared with direct pressure method of testing, the utility model passes through closed-loop control
System controls the aperture of electric-gas ratio/servo valve to carry out the flow of gas in control loop, thus accurately controlling the pressure of tested cavity volume
Power.
2. fuel tank outer wall and oil sac can detect simultaneously, also can individually detect.Direct pressure method of testing only has a road to control back
Road, pneumatic circuit of the present utility model realizes the airtight detection in two-way autonomous channel, and two passages can work it is also possible to each other simultaneously
The voltage-controlled system of cushion gas, controls the aperture of electric-gas ratio/servo valve, thus filling to measurand by closed-loop control system
Outgassing rate controls.
3. exhaust buffering.Compared with differential pressure method of testing, the utility model realizes two-way linkage at the end of airtight detection, leads to
Cross and control the aperture of two-way electric-gas ratio/servo valve to realize the control of two paths differential pressure range, it is to avoid during exhaust, produce pressure
Impact phenomenon, realizes slow step-down protection measured piece.
4. structure is simple, has good economy.Compared with differential pressure method of testing, the utility model is not required to adopt No leakage
Standard cavity volume, therefore structure is relatively simple, has good economy.
Air tightness detection apparatus in the utility model and its method of servo-controlling, both can also may be used only with a road loop
To adopt two-way loop simultaneously.When only with a road loop, this air tightness detection apparatus and its method of servo-controlling are compared directly
Pressure test method has a clear superiority；Because the pressure that sensor in direct pressure method of testing detects is instantaneous pressure value, it is not
The pressure value of tested cavity volume this moment, when being filled with a certain amount of gas and turning off source of the gas to tested cavity volume, records pressure sensing
The value of device, the gas flowing through pipeline is filled with tested cavity volume, and after stable, the indicating value of sensor can decrease, and causes tested appearance
Even if chamber is not revealed all there is measure error；And detection method of the present utility model, due to initial when input goal pressure, pass through
Goal pressure controls proportional servo valve with the difference of sensor, as long as tested chamber pressure is inconsistent with goal pressure, ratio is watched
Take valve will action, until tested chamber pressure is consistent with goal pressure, do not result in tested cavity volume after shutoff source of the gas yet and do not let out
The measure error of dew all presence, can accurately control tested chamber pressure.
When the utility model adopts two-way loop simultaneously, this air tightness detection apparatus and its method of servo-controlling are especially suitable
In the airtight detection of fuel system.This air tightness detection apparatus and its method of servo-controlling compare differential pressure method of testing also have substantially excellent
Gesture；Fuel tank due to fuel system broadly falls into measured piece with oil sac, is required to detect air-tightness, is examined using the utility model
Do not need during survey additionally to arrange the standard component in differential pressure method of testing, that is, save financial cost；Can be saved the time using two-way loop
Cost；On the other hand, this air tightness detection apparatus and its method of servo-controlling are applicable to the fuel system of various models, application side
Just.Additionally, in venting, two paths differential pressure range control is realized by the aperture controlling two-way electric-gas ratio/servo valve
System, it is to avoid produce compression shock phenomenon during exhaust, realizes slow step-down protection measured piece.
To sum up, in the utility model air tightness detection apparatus and its method of servo-controlling by closed-loop control system control electricity-
The aperture of gas ratio/servo valve carrys out the flow of gas in control loop, increased the free degree of system control, can be to controlled cavity volume
Charge, exhaust speed be independently controlled.In addition, controlled cavity volume charge, exhaust independent control structure one side can avoid can not
Predictive factorses lead to electric-gas ratio/servo valve switching problem by mistake, on the other hand, also can avoid pressing by charge, exhaust independent control
Power impact and vibrating, thus the air-tightness of detecting system effectively.The servo control for airtight detection that the utility model provides
Method processed is also applied for other system.
Brief description
Fig. 1 is to show for the structural representation of air tightness detection apparatus and its corresponding method of servo-controlling in the utility model
It is intended to (taking the airtight detection of fuel system as a example)；
Fig. 2 is structural representation and the method for servo-controlling M signal stream being used for air tightness detection apparatus in the utility model
Constitute (taking the airtight detection of fuel system as a example).
Specific embodiment
In order that the purpose of this utility model, technical scheme and advantage become more apparent, below in conjunction with accompanying drawing and enforcement
Example, is further elaborated to the utility model.It should be appreciated that specific embodiment described herein is only in order to explain
The utility model, is not used to limit the utility model.Additionally, institute in each embodiment of the utility model disclosed below
As long as the technical characteristic being related to does not constitute conflict each other just can be mutually combined.
The SERVO CONTROL structure (taking the airtight detection of fuel system as a example) of air tightness detection apparatus in the utility model, including the
One road pressure control loop and the second road pressure control loop.Wherein first via pressure control loop includes pressure source, electric-gas ratio
Example/servo valve, controlled cavity volume oil sac, high-precision pressure sensor, analog/digital conversion and digitial controller are (as comparator
Deng).Second road pressure control loop includes pressure source, electric-gas ratio/servo valve, and controlled cavity volume fuel tank (that is, excludes ball
Space after capsule, being wrapped to form by oil tank wall), high-precision pressure sensor, D/A switch and digitial controller.Wherein:
In first via pressure control loop, pressure source provides source of the gas for first via pressure control loop；Electric-gas ratio/watch
Taking valve is to control executive component；Oil sac is controlled device；High-precision sensor is feedback element；Analog/digital conversion and numeral control
Device processed is control unit.
In second road pressure control loop, pressure source provides source of the gas for the second road pressure control loop；Electric-gas ratio/watch
Taking valve is to control executive component；Fuel tank is controlled device；High-precision sensor is feedback element；Analog/digital conversion and numeral control
Device processed is control unit.
The SERVO CONTROL structure of this air tightness detection apparatus, by electric-gas ratio/servo valve control system pressure source respectively, increases
The free degree that system controls, is independently controlled to the deflation rate of filling of controlled cavity volume.
The corresponding electric-gas ratio/corresponding source of the gas of servo valve control in each road, a certain work of electric-gas ratio/servo valve
Position is blocked by gas plug, and another working position can control the flow of inflation/exhaust to control controlled appearance cavity pressure.This fill exhaust
Independent control structure one side can avoid unpredictable factor to lead to control valve switching problem by mistake, on the other hand passes through fill, arrange
Gas independent control also can avoid compression shock and vibration, improves the stationarity that controlled chamber pressure controls, thus improve system
Control characteristic.
It is used for the method for servo-controlling of air tightness detection apparatus in the utility model, be that one kind is controlled by closed-loop control system
The method to control chamber pressure for the aperture of electric-gas ratio/servo valve.
It is below specific embodiment.
Embodiment 1
Taking the airtight detection of fuel system as a example, as shown in figure 1, the method for servo-controlling of this air tightness detection apparatus includes two-way
Pressure control loop.
First via pressure control loop includes pressure source (i.e. the first source of the gas), electric-gas ratio/servo valve, controlled appearance
The parts such as chamber oil sac, high-precision pressure sensor, analog/digital conversion and digitial controller.In first via Stress control system
In system, controlled device is oil sac；Executive component is electric-gas servomechanism installation (i.e. the first electric-gas ratio/servo valve)；Feedback element is
High-precision pressure sensor；Digitial controller is control element.
The process nature that air pressure controls is the inflation/deflation process of controlled cavity volume, adjusts controlled appearance by electric-gas servomechanism installation
Chamber air total amount, thus adjust the air pressure in cavity volume.The ratio to input instruction signal and sensor feedback pressure value for the controller
Relatively, press, according to error, the control law (as pid PID control parameter rule etc.) setting to control by electric-gas servomechanism installation
The flow direction of gas and flow in loop processed, thus controlling the tolerance passing in and out controlled cavity volume, the gas in the controlled cavity volume of indirect control
Pressure value, and export to external sensor as control output signal.When actual pressure value is less than target pressure in control process
During force value (this target pressure value can pre-set), loop is passed through electric-gas ratio/servo valve and is connected source of the gas can be suitable
Increase the aperture of electric-gas ratio/servo valve, to cavity volume inflation so that cavity volume internal gas pressure raises；When the pressure value in cavity volume is close
During target pressure value, controller controls electric-gas ratio/servo valve so as to opening reduces, and in loop, gas flow reduces, until
Controlled cavity volume internal gas pressure reaches the target pressure value of command signal setting, and electric-gas ratio/servo valve cuts out.
The pressure controlled detailed process of the above-mentioned first via is:
1. the first via command signal obtaining when controller and first via pressure sensor feed back the difference of signal, and (command value subtracts
Value of feedback) it is on the occasion of for making gas pressure in oil sac reach desired value, then control first via electric-gas ratio/servo valve opening is
Just, (as shown in Figure 2) is connected in the right position of servo valve, and that is, gas port 1 is connected with gas port 2, and source of the gas is inflated to oil sac, gas pressure in oil sac
Rise.Meanwhile, controller controls the second tunnel electric-gas ratio/servo valve opening is negative, and (as shown in Figure 2) is connected in the left position of servo valve,
I.e. gas port 2 is connected with gas port 3, and by the gas discharge in fuel tank, (the gas pressure value maximum in fuel tank is not less than external atmosphere pressure
Value, such as 1 standard atmospheric pressure value).
2. the first via command signal obtaining when controller and first via pressure sensor feed back the difference of signal, and (command value subtracts
Value of feedback) close to zero when, for making gas pressure in oil sac reach desired value, then control first via electric-gas ratio/servo valve opening
Close.Finally, oil sac internal gas pressure reaches the target pressure value of command signal setting.
Second road pressure control loop includes pressure source (i.e. the second source of the gas), electric-gas ratio/servo valve (i.e. the second electric-gas
Ratio/servo valve), controlled cavity volume fuel tank, high-precision pressure sensor, the part such as analog/digital conversion and digitial controller.
In the second road control pressurer system, controlled device is fuel tank；Executive component is electric-gas servomechanism installation；Feedback element is high accuracy
Pressure sensor；Digitial controller is control element.Its course of work is substantially identical with first via pressure control procedure, and it is concrete
Process is:
1. the second tunnel command signal obtaining when controller and No. second pressure sensor feed back the difference of signal, and (command value subtracts
Value of feedback) it is on the occasion of (this desired value alternatively pre-sets, its big I to make oily loading pressure reach desired value
With equal or different to the target pressure value for target pressure value), then control the second tunnel electric-gas ratio/servo valve opening to be
Just, (as shown in Figure 2) is connected in the right position of servo valve, and that is, gas port 1 is connected with gas port 2, and source of the gas is inflated to fuel tank, oily loading pressure
Rise.Meanwhile, controller controls first via electric-gas ratio/servo valve opening is negative, and (as shown in Figure 2) is connected in the left position of servo valve,
I.e. gas port 2 is connected with gas port 3, by oil sac gas discharge (tested cavity volume, including the gas pressure value in oil sac and fuel tank
All it is not less than external atmosphere pressure value, such as 1 standard atmospheric pressure value greatly).
2. the second tunnel command signal obtaining when controller and No. second pressure sensor feed back the difference of signal, and (command value subtracts
Value of feedback) close to zero when, for making gas pressure in cavity volume reach desired value, then control the second tunnel electric-gas ratio/servo valve opening
Close.Finally, fuel tank internal gas pressure reaches the target pressure value of command signal setting.
When carrying out airtight detection, the change of the pressure value by detecting in a period of time judges examined object
The air-tightness of the cavity volume of (including the first examined object, the second examined object)；Detection time can be adjusted flexibly as needed,
If the pressure value detecting this period decrease beyond regulation amplitude, the air-tightness of the cavity volume of this examined object is unsatisfactory for will
Ask；Otherwise the air-tightness of the cavity volume of this examined object reaches requirement.
At the end of airtight detection, it is the just right position of servo valve that controller controls the second tunnel electric-gas ratio/servo valve opening
Connect (as shown in Figure 2), that is, gas port 1 is connected with gas port 2, source of the gas is inflated to fuel tank, controller controls first via electric-gas ratio simultaneously
Example/servo valve opening is negative, and (as shown in Figure 2) is connected in the left position of servo valve, and that is, gas port 2 is connected with gas port 3, and oil sac is outwards vented,
Realize two paths differential pressure range now by the aperture controlling two-way electric-gas ratio/servo valve to control, it is to avoid produce during exhaust
Raw compression shock phenomenon, realizes slow step-down protection oil sac.
Proportional servo valve (that is, ratio/servo valve, also referred to as servo proportion) in the utility model, has several work
State, be respectively as follows: the conducting state that source of the gas is connected with cavity volume, conducting state that external environment gas is connected with cavity volume,
And off state (the state of off state as proportional servo valve holding closing, i.e. cavity volume keeps at this proportional servo valve
Closing, even if there is draught head, the flow flowing through the gas of this proportional servo valve is also still 0).When proportional servo valve is in gas
During the conducting state that source is connected with cavity volume, it is typically greater than the atmospheric pressure value in cavity volume due to the atmospheric pressure value of source of the gas, in source of the gas
Gas can flow in cavity volume from source of the gas；When proportional servo valve is in the conducting state that external environment gas is connected with cavity volume,
It is equal to ambient air pressure (such as 1 standard atmospheric pressure) because the atmospheric pressure value in cavity volume is typically larger than, when being in the bar being more than
When under part, the gas in cavity volume can flow to external environment in cavity volume；When be in equal under conditions of when, substantially do not flow through
The gas of this proportional servo valve.
The first source of the gas in the utility model and the second source of the gas can adopt same source of the gas (as same gas cylinder), now the first gas
The highest air pressure in source is identical with the highest air pressure of the second source of the gas, and the species of source gas does not limit.
Controller in the utility model simply can adopt comparator, or has the single-chip microcomputer of comparing function, computer etc..
As it will be easily appreciated by one skilled in the art that the foregoing is only preferred embodiment of the present utility model, not
In order to limit the utility model, all any modifications made within spirit of the present utility model and principle, equivalent and change
Enter, should be included within protection domain of the present utility model.
Claims (7)
1. a kind of air tightness detection apparatus are it is characterised in that include the first source of the gas and first time be connected with this first source of the gas
Road, wherein,
Described first loop includes first pressure sensor and the first proportional servo valve,
Described first source of the gas is connected by described first proportional servo valve with the cavity volume of the first examined object, described first source of the gas
It is passed through gas for the cavity volume to described first examined object；This first proportional servo valve be used for switching described first source of the gas with
Conducting state between the cavity volume of described first examined object, adjusts described first source of the gas to described first examined object
The flow of the gas that cavity volume is passed through；
Described first pressure sensor is connected with the cavity volume of described first examined object, for detecting this first examined object
Cavity volume in pressure, the change of the pressure value by detecting in a period of time judges the cavity volume of this first examined object
Air-tightness；Described first pressure sensor is also connected with described first proportional servo valve, for adjusting this first proportional servo
The conducting state of valve or off state.
2. a kind of air tightness detection apparatus it is characterised in that include the first source of the gas, the first loop of being connected with this first source of the gas, the
Two sources of the gas and the second servo loop being connected with this second source of the gas, wherein,
Described first loop includes first pressure sensor and the first proportional servo valve, described first source of the gas and the first thing to be detected
The cavity volume of body passes through described first proportional servo valve and is connected, and described first source of the gas is used for the cavity volume to described first examined object
It is passed through gas；This first proportional servo valve is used for switching between described first source of the gas and the cavity volume of described first examined object
Conducting state, adjusts the flow of the gas that described first source of the gas is passed through to the cavity volume of described first examined object；
Described first pressure sensor is connected with the cavity volume of described first examined object, for detecting this first examined object
Cavity volume in pressure, the change of the pressure value by detecting in a period of time judges the cavity volume of this first examined object
Air-tightness；Described first pressure sensor is also connected with described first proportional servo valve, for adjusting this first proportional servo
The conducting state of valve or off state；
Described second servo loop includes second pressure sensor and the second proportional servo valve, described second source of the gas and the second thing to be detected
The cavity volume of body passes through described second proportional servo valve and is connected, and the cavity volume that described second source of the gas is used for the second examined object is passed through
Gas；This second proportional servo valve is used for switching the conducting between described second source of the gas and the cavity volume of described second examined object
State, adjusts the flow of the gas that described second source of the gas is passed through to the cavity volume of described second examined object；
Described second pressure sensor is connected with the cavity volume of described second examined object, for detecting this second examined object
Cavity volume in pressure；Described second pressure sensor is also connected with described second proportional servo valve, for adjusting this second ratio
The conducting state of example servo valve or off state；
Additionally, described first examined object is also wrapped up by described second examined object.
3. air tightness detection apparatus as claimed in claim 1 or 2 are it is characterised in that described first loop also includes first comparator,
This first comparator is connected with described first pressure sensor and described first proportional servo valve respectively, and for according to described the
The pressure value in the cavity volume of described first examined object that one pressure sensor detects and pre-set first to be checked
Survey object target pressure value, adjustment flows through the flow of the gas of this first proportional servo valve.
4. air tightness detection apparatus as claimed in claim 2, should it is characterised in that described second servo loop also includes the second comparator
Second comparator is connected with described second pressure sensor and described second proportional servo valve respectively, and is used for according to described second
The pressure value in the cavity volume of described second examined object that pressure sensor detects and pre-set second to be detected
Object target pressure value, adjustment flows through the flow of the gas of this second proportional servo valve.
5. air tightness detection apparatus as claimed in claim 2 are it is characterised in that described first proportional servo valve and described second ratio
Servo valve is electric-gas proportional servo valve.
6. air tightness detection apparatus as claimed in claim 2 are it is characterised in that described first source of the gas and described second source of the gas are same
Source of the gas.
7. air tightness detection apparatus as claimed in claim 2 are it is characterised in that described first examined object is oil sac, described the
Two examined object are fuel tank.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620774783.3U CN205898398U (en) | 2016-07-22 | 2016-07-22 | Airtightness detecting device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620774783.3U CN205898398U (en) | 2016-07-22 | 2016-07-22 | Airtightness detecting device |
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| CN205898398U true CN205898398U (en) | 2017-01-18 |
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| CN201620774783.3U Withdrawn - After Issue CN205898398U (en) | 2016-07-22 | 2016-07-22 | Airtightness detecting device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106197902A (en) * | 2016-07-22 | 2016-12-07 | 华中科技大学 | A kind of air tightness detection apparatus and method of servo-controlling thereof |
| CN111521349A (en) * | 2020-04-21 | 2020-08-11 | 博众精工科技股份有限公司 | Inflation and deflation control method, device and system, electronic equipment and medium |
| CN112540631A (en) * | 2020-11-30 | 2021-03-23 | 武汉市天毅达测控科技有限公司 | Pressure controller |
-
2016
- 2016-07-22 CN CN201620774783.3U patent/CN205898398U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106197902A (en) * | 2016-07-22 | 2016-12-07 | 华中科技大学 | A kind of air tightness detection apparatus and method of servo-controlling thereof |
| CN106197902B (en) * | 2016-07-22 | 2019-01-18 | 华中科技大学 | A kind of air tightness detection apparatus and its method of servo-controlling |
| CN111521349A (en) * | 2020-04-21 | 2020-08-11 | 博众精工科技股份有限公司 | Inflation and deflation control method, device and system, electronic equipment and medium |
| CN112540631A (en) * | 2020-11-30 | 2021-03-23 | 武汉市天毅达测控科技有限公司 | Pressure controller |
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