CN1167913A - Method and apparatus for testing pressure relief - Google Patents
Method and apparatus for testing pressure relief Download PDFInfo
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- CN1167913A CN1167913A CN 96107942 CN96107942A CN1167913A CN 1167913 A CN1167913 A CN 1167913A CN 96107942 CN96107942 CN 96107942 CN 96107942 A CN96107942 A CN 96107942A CN 1167913 A CN1167913 A CN 1167913A
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000003556 assay Methods 0.000 claims description 29
- 230000008676 import Effects 0.000 claims description 21
- 230000009467 reduction Effects 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 4
- 230000006835 compression Effects 0.000 abstract description 16
- 238000007906 compression Methods 0.000 abstract description 16
- 238000001514 detection method Methods 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 14
- 230000033228 biological regulation Effects 0.000 description 7
- 210000005241 right ventricle Anatomy 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000006837 decompression Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000000977 initiatory effect Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000009958 sewing Methods 0.000 description 2
- 208000031481 Pathologic Constriction Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000036262 stenosis Effects 0.000 description 1
- 208000037804 stenosis Diseases 0.000 description 1
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Abstract
A method and its device to detect pressure relief are disclosed. A pressurized gas is introduced into inside of object to be detected until the internal pressure of the object reaches a defined value. The pressure relief is detected according to the decreasement level in the internal pressure. It features that the residual air in the object must be exhausted before pressurized gas is introduced into it. Its advantages are to prevent the pressure variation caused by insulating compression of air in the object to be detected, and quick and accurate detection.
Description
The present invention relates to pressure and sew determination techniques, it is the inside that imports determinand from the gas-pressurized of pressurized-gas source output, measures and sews from the pressure of determinand by measuring the determinand pressure inside then.
In order to check the leakproofness of the determinands such as cast blank that motor car engine is used, often make in this way, after promptly the gas-pressurizeds such as pressurized air from the output of pressurized-gas sources such as air compressor being imported determinand inside, measure the method for sewing from the pressure of determinand.
The object lesson of the assay method that this pressure is sewed is opened the invention of the air leak-test of being put down in writing for clear 62-58127 number just like Jap.P. open report spy.The technology of being put down in writing in this part communique is the inside that gas-pressurized is fed to determinand, till this internal pressure reaches set pressure, through behind the setting-up time, measures from the pressure of determinand by the internal pressure of measuring determinand and to sew.
Developed a kind of device that high-precision pressure is sewed mensuration that is used for carrying out, it has been equipped with a kind of check gauge container (following, abbreviate as check gauge) of a constant volume of the benchmark when having as piezometry, by pressure detector this check gauge is connected with determinand, measures from the pressure of determinand and sew by detecting pressure reduction between the two.
This object lesson of measuring the determinator that pressure sews according to pressure reduction is sewed the invention that determinator and pressure are sewed assay method just like the pressure of being put down in writing in the Japanese patent laid-open 8-15079 communique.
The technology of above-mentioned this part application is in addition airtight as corrective gauge the part of pipeline, adopts the mode that the pressure in this airtight pipeline and the pressure in the determinand are compared.Promptly, pipeline portions and the determinand that is sealed coupled together by pressure detector.And pressurized air imported in determinand and the airtight pipeline portions, reach measure pressure after, change the pressure of measuring from determinand in time and sew by measuring pressure difference.
But above-mentioned any one determination techniques all can produce problem as shown in Figure 6 and Figure 7.Fig. 6 represents that it is V that gas-pressurized is fed to internal capacity
0Determinand W
10The synoptic diagram of the pressure, temperature variation when interior.
Shown in Fig. 6 (A), initial, using the temperature identical with outside air temperature is T
0, air pressure is P
0The air of (atmospheric pressure) is full of determinand W
10Inner.When being air pressure P
1Gas-pressurized be fed to determinand W
10When interior, originally stayed determinand W
10Like that by adiabatic compression, temperature rises to T to interior air shown in figure b (B)
tAfter this shown in Fig. 6 (C), switch valve cuts out, thereby make determinand W
10Interior gas is even, makes pressure become P
t, temperature becomes T.
Wherein, because T＞T
0, thereby after this determinand W
10Interior gas temperature will drop to outer atmospheric temperature T
0Determinand W
10Interior gas temperature drops to outer atmospheric temperature T
0The time gaseous tension get into P
1The time, by Bo Yier-Charlie's rule, following formula (1) is set up.
Pt·V
0/T＝P
1·V
0/T
0 …(1)
Be P
1=Pt (T
o/ T)
Because T＞T
0So P
1＜Pt.
That is, along with the determinand W that has risen by adiabatic compression
10Decline, the determinand W of interior gas temperature
10Interior pressure also descends.Whether this pressure pipe pressure that descends is not sewed all and will be taken place.
Fig. 7 is represented that the ordinate of Fig. 7 is represented determinand W to the state that this pressure descends as chart
10The pressure of interior gas, abscissa is represented elapsed time.
By being air pressure that the gas-pressurized of Pt is fed to determinand W
10In, make determinand W
10Pressure at moment t
1Reach Pt.If at this moment, cut off the supply of gas-pressurized, make determinand W
10Become air-tight state, then produce the pressure that changes along with said temperature and descend determinand W
10The interior also just variation shown in curve A of pressure.
When the time from t
1To t
2, after continue supplying with gas-pressurized, make determinand W
10Become under the occasion of air-tight state, because to time t
2Determinand W before
10Interior gas temperature has to a certain degree decline, thereby the decline of pressure after this is just less, and pressure changes just as curve B.To time t
3Supply with under the occasion of gas-pressurized, pressure descends just littler, does not descend but also become fully, and pressure changes as curve C.Relative therewith, at determinand W
10Interior gas temperature drops to outer atmospheric temperature T
0The time t
4Constantly supply with under the gas-pressurized occasion, descend with regard to not producing the pressure that causes because of temperature variation.
Like this, sew mensuration, must wait until time t shown in Figure 7 in order to carry out accurate pressure
4, therefore just the problem that need spend the long period just can measure is arranged.
The purpose of the described invention of the application's claim 1 provides a kind of pressure and sews assay method, and its temperature change by preventing to cause because of the air adiabatic compression of originally staying determinand inside can be carried out the mensuration that accurate pressure is sewed in the short time.
The purpose of the application's claim 2 and 3 described inventions provides the simple structure of a kind of usefulness, just can carry out the mensuration that accurate pressure sews in the short time pressure is sewed assay method.
It is the inside that gas-pressurized is imported determinand that the pressure of the described invention of claim 1 is sewed assay method; When the internal pressure of determinand reaches set pressure, end the importing of gas-pressurized; Then according to the minimizing degree of the internal pressure of measured object, mensuration is sewed from the pressure of this determinand, it is characterized in that: the operation of having added before the inside that gas-pressurized is imported to above-mentioned determinand, the air of originally staying determinand inside being discharged.
When this method of employing, before gas-pressurized is imported determinand inside, be discharged from originally staying the air of measuring in the thing.Like this, because the air adiabatic compression along with the importing of gas-pressurized that is produced during technology before can not adopting, thereby can not take place to import the pressure variation that the back temperature variation causes because of gas-pressurized.Like this, import the back pressure that just can will begin in a minute at gas-pressurized and sew mensuration.
Like this, in the method,, can in the short time, carry out accurate pressure and sew mensuration by the pressure variation that prevents to cause because of the air adiabatic compression of originally staying determinand inside.
The described invention of claim 2 is characterized in that the air of originally staying this determinand inside being discharged by the gas-pressurized that imports in the operation starting stage that gas-pressurized is imported the inside of determinand.
When this method of employing,, the air of originally staying determinand inside is discharged from determinand in the operation starting stage that gas-pressurized is imported determinand inside.Like this, owing to can not cause that in determinand inside importing the air adiabatic that takes place with gas-pressurized compresses, thereby just can not take place because of the caused pressure variation of temperature variation after the gas-pressurized importing.Like this, gas-pressurized import the back just immediately initiation pressure sew mensuration.
Like this, just can in the short time, carry out the mensuration that accurate pressure is sewed with simple structure.
The described invention of claim 3, it is characterized in that: when gas-pressurized is imported the inside of determinand, be the import volume importing gas-pressurized with such time per unit, promptly import volume being reduced in fact can be compressing the degree that caused temperature rise is ignored by the air adiabatic of originally staying determinand inside.
In this assay method, the time per unit import volume of gas-pressurized is reduced to the sort of degree, promptly compresses caused intensification in fact to measuring not influence of precision by the air adiabatic of originally staying determinand inside.Like this, can not cause temperature variation in fact when importing, thereby can not produce the pressure variation that causes because of the temperature variation that causes after the gas-pressurized importing yet owing to gas-pressurized.Like this, gas-pressurized import the back just immediately initiation pressure sew mensuration.
Like this, with simple structure, in the short time, just can carry out the mensuration that accurate pressure is sewed.
Above-mentioned three assay methods are can both be as previously mentioned special, and to open the technology that clear 62-58127 communique put down in writing such, also can be used in the assay method that does not use corrective gauge.And, use corrective gauge when being used in, when utilizing in the method that detects pressure reduction between corrective gauge and the determined object, can carry out the very high mensuration of reliability.
Using corrective gauge, detecting under the situation of pressure reduction, use differential pressure pickup.Differential pressure pickup has Room the 1st and Room the 2nd, detects the pressure reduction of two Room.At this moment, in case produce excessive pressure reduction between the Room the 1st, the 2nd, just easily differential pressure pickup is damaged.Even use the differential pressure pickup that also can not damage when bigger pressure reduction, at this moment detection sensitivity is just relatively poor.So also propose a kind of determinator that can protect differential pressure pickup can carry out micrometric measurement simultaneously in the present invention.
Therefore, pressure of the present invention is sewed determinator and is possessed: have with gas-pressurized import corrective gauge and this corrective gauge inside pipeline, with gas-pressurized import determinand and determinand inside pipeline, have Room the 1st that is communicated with corrective gauge and the differential pressure pickup of the Room the 2nd that is communicated with determinand; It is characterized in that: set up pipeline that corrective gauge and Room the 2nd are communicated with, be arranged on the 1st switch valve between corrective gauge and the Room the 2nd, be arranged on the 1st switch valve between corrective gauge and the Room the 2nd, be arranged on the 2nd switch valve between determinand and the Room the 2nd; Above-mentioned the 1st switch valve is opened, is closed in differential pressure pickup mensuration process when gas-pressurized is imported corrective gauge inside; Above-mentioned the 2nd switch valve is closed, is opened in differential pressure pickup mensuration process when gas-pressurized being imported the inside of corrective gauge and determinand.
When using this determinator, gas-pressurized guiding corrective gauge the time, when the air of originally staying determinand inside is discharged, at each different times such as inside that gas-pressurized imported determinand, it almost is the Room the 1st, the 2nd that the pressure that equates is imported differential pressure pickup, prevent the damage of differential pressure pickup thus, thereby just can utilize the good differential pressure pickup of detection sensitivity.
Fig. 1 is illustrated in pressure of the present invention to sew the block scheme that used pressure among the 1st embodiment of assay method is sewed determinator,
Fig. 2 is that expression pressure is sewed the procedure time chart that the mensuration pressure among the 1st embodiment of assay method is sewed,
Fig. 3 is illustrated in pressure of the present invention to sew the block scheme that used pressure among the 2nd embodiment of assay method is sewed determinator,
Fig. 4 is illustrated in pressure of the present invention to sew the block scheme that used pressure among the 3rd embodiment of assay method is sewed determinator,
Fig. 5 is illustrated in pressure of the present invention to sew the block scheme that used pressure among the 4th embodiment of assay method is sewed determinator,
Fig. 6 is illustrated in the synoptic diagram that former pressure is sewed the adiabatic compression in the determined object in the assay method,
Fig. 7 is illustrated in former pressure to sew the curve that the interior pressure of determined object in the assay method changes.
(the 1st embodiment)
Below, with reference to Fig. 1 the embodiment 1 that the present invention specializes is carried out specific description.Fig. 1 is illustrated in the present invention's the 1st embodiment pressure to sew the integrally-built piping diagram that pressure used in the assay method is sewed determinator 2.Present embodiment mainly is corresponding with the described invention of claim 1.
As shown in Figure 1, sew in the determinator 2, be connected on the regulator 8 from the pipeline 6A of pressurized-gas source (air compressor) 4 at the pressure of present embodiment; The outgoing side of regulator 8 is connected in pipeline 6B.By this regulator 8 pressure from pressurized-gas source 4 compressed and supplied air (gas-pressurized) is adjusted to original pressure.Pipeline 6B is provided with tensimeter 10 and is used for measuring the compressed-air actuated pressure of exporting from regulator 8.
Pipeline 6B is connected with press-stored slot 12.This press-stored slot 12 is to store to be adjusted to the compressed-air actuated of original pressure, has the much bigger volume than following workpiece (determinand) W.
Press-stored slot 12 is being connected with pressure control assembly 20 by pipeline 6C.This pressure control assembly 20 has 2 regulators 14,16, and they have the function that is adjusted to the mensuration pressure of regulation by the pressure of press-stored slot 12 compressed and supplied air.The pipeline 6D that outlet side connected of pressure control assembly 20 is being connected with heat exchanger 22.This heat exchanger 22 is cooled to normal temperature to the temperature from pressure control assembly 20 compressed and supplied air.The outlet side of heat exchanger 22 is installed with pressure transducer 24, and the pressure data of being measured by pressure transducer 24 is fed to above-mentioned pressure control assembly 20 by signal wire 26.As a result, pressure control assembly 20 just is held in certain pressure to the pressure of the pressurized air that is in normal temperature (gas-pressurized).
The outlet side of heat exchanger 22 is connecting electromagnetic switch valve 30 by pipeline 6E.Tell pipeline 6F from pipeline 6E, this pipeline 6F is connected with following integrated package assembly 90.
On the other hand, when not having in by figure the control signal of the control computer output of expression not make electromagnetic solenoid 32 excitations, each valve chamber overcomes the screen resilience of spring 36 and moves, thereby valve chamber 34A is connected with pipeline 6E, 6G.Thus, pipeline 6E and pipeline 6G are in the state of connection, and pressurized air is by valve chamber 34A feeding pipe 6G.
On the other hand, when the control signal that is gone up the control computer output that there is not expression by figure makes electromagnetic solenoid 42 excitations, each valve chamber overcomes the screen resilience of spring 46 and moves, thereby the valve chamber 44A of closed condition is connected with pipeline 6G, 6H, thus the connection of pipeline 6G and pipeline 6H is cut off.
Outlet side at workpiece W is connecting pipeline 6J, and this pipeline 6J is connected with following integrated package assembly 90.In addition, tell pipeline 6K from pipeline 6J, pipeline 6K is connected with vacuum pump 56 by switch valve (stop valve) 52, pipeline 6M.Again in the front of switch valve 52 side, tell pipeline 6L from pipeline 6K, pipeline 6L to atmosphere opening by switch valve 54.In addition, on pipeline 6J pressure transducer 50 is installed with take-off point place pipeline 6K.
Below, the structure of integrated package assembly 90 is described.As shown in Figure 1, integrated package assembly 90 constitutes by 3 air pilot valves 60,70,80 and differential pressure pickup 92 and with the interconnective pipeline of these members.
The pipeline 6J that is connected workpiece W outlet is connected with air pilot valve 70, and air pilot valve 70 is connected with air pilot valve 80 by pipeline 6R.Air pilot valve 80 is connected with check gauge 94 by pipeline 6T again.
In addition, the pipeline 6F that tells from pipeline 6E is connected with air pilot valve 60, and air pilot valve 60 is being connected with the left chamber of differential pressure pickup 92 by pipeline 6P.On the other hand, the right ventricle of differential pressure pickup 92 by the road 6S be connected with the centre of pipeline 6T.
Pipeline 6P is being connected by pipeline 6Q again with pipeline 6R.
Switch valve in the integrated package assembly 90 all uses the air pilot valve, and this is because when using solenoid valve, can be caused the error in the piezometry in the differential pressure pickup 92 by the heating in the electromagnetic solenoid.
After the air pressure that 92 pairs of differential pressure pickups are supplied with left chamber and right ventricle respectively compares, output and the corresponding measured signal of this pressure differential.
In this device, differential pressure pickup 92 is provided with Room the 1st (right ventricle) and Room the 2nd (left chamber), and Room the 1st (right ventricle) be 6S and check gauge 94 connections by the road, and Room the 2nd (left chamber) 6P, 6Q, 6R, 6J by the road is being communicated with workpiece W.Air pilot valve 60, pipeline 6P, 6Q, 6R, air pilot valve 80 and pipeline 6T are the importing paths that pressurized air is imported check gauge 94 usefulness, and this importing path 6P by the road also is being communicated with Room the 2nd.Thus, between Room the 1st, the 2nd, can not produce big pressure reduction during the check gauge 94 that pressurized air is led, at differential pressure pickup 92.Between the Room the 2nd (left chamber) of check gauge 94 and differential pressure pickup 92, the air pilot valve 80 as the 1st switch valve is being set, this air pilot valve 80 is closed in mensuration, thereby the pressure in the mensuration of being undertaken by differential pressure pickup 92, in the check gauge 94 can not be imported into Room the 2nd.In addition, the air pilot valve 70 as the 2nd switch valve is being set also between the Room the 2nd (left chamber) of differential pressure pickup 92 and workpiece W,, thereby the pressure of workpiece W is being imported Room the 2nd in mensuration because differential pressure pickup 92 makes this air pilot valve open.
Below, with reference to seeing Fig. 1, simultaneously the pressure of present embodiment with this structure being sewed pressure in the determinator 2 and sew the mensuration program and describe according to Fig. 2.Fig. 2 is that expression pressure is sewed mensuration procedure time chart.It is from step S that pressure is in the present embodiment sewed mensuration
1To step S
8Each stage carry out successively.
At step S
1In the stage, electromagnetic switch valve 30 is closed (pipeline 6G is in the state to atmosphere opening), electromagnetic switch valve 40 is opened, and stop valve 52,54 is being closed.And the air pilot valve 60,80 in the integrated package assembly 90 is being opened, and air pilot valve 70 is being closed.That is, beyond deacration pilot valve 70 had been closed, all the other all became state shown in Figure 1.
Under this state, the pressurized air that is adjusted to the mensuration pressure of regulation with pressure control assembly 20 is supplied to check gauge 94 by pipeline 6F, air pilot valve 60, pipeline 6P, 6Q, 6R, air pilot valve 80, pipeline 6T from pipeline 6E branch.When pressurized air imported check gauge 94, pressurized air was imported the Room the 1st (right ventricle) and the lining, Room the 2nd (left chamber) of differential pressure pickup 92 respectively, does not produce bigger pressure reduction between the left chamber of differential pressure pickup 92 and left chamber.On the other hand, cut off by electromagnetic switch valve 30 and air pilot valve 70 owing to be communicated with the pipeline of workpiece W, therefore can be at this step S
1Replace the workpiece of having measured with new workpiece.
After workpiece W is connected on pipeline 6H, the pipeline 6J, enter step S
2, stop valve 52 is opened, and electromagnetic switch valve 40 is closed.Thus, by the usual vacuum pump that is moving 56, by pipeline 6J, 6K, 6M with suction of the air in the workpiece W and exhaust.After carrying out certain hour suction exhaust, enter step S
3, because stop valve 52 is closed, thereby exhaust is stopped, and is closed because of air pilot valve 60 simultaneously, is stopped so supply with pressurized air to check gauge 94.At this moment, the internal pressure of check gauge 94 equals the pressure by pressure control assembly 20 adjustment.
After this, open electromagnetic switch valve 30, open electromagnetic switch valve 40 after a while constantly, the supply of the pressurized air of the mensuration pressure of regulation is in the workpiece W of decompression state by pipeline 6G, electromagnetic switch valve 40, pipeline 6H at this.Supply with at the appointed time after the pressurized air, at step S
4With electromagnetic switch valve 40 and close, thereby workpiece W and compressed-air supply system are cut off.When electromagnetic switch valve 40 was closed, workpiece W pressure inside equaled the pressure by pressure control assembly 20 adjustment.
Then, enter step S
5, air pilot valve 70 is opened.Thus, by pipeline 6J, air pilot valve 70, pipeline 6R, air pilot valve 80, pipeline 6T, 94 one-tenth states that are communicated with of workpiece W and check gauge average out the compressed-air actuated pressure in workpiece W, the check gauge 94.Air pilot valve 70 is being opened, and when making pressure equilibrium begin to form, the pressure in pressure in the workpiece W and the check gauge 94 is almost equal, can not produce big pressure reduction between the right ventricle of differential pressure pickup 92 and left chamber.Then, at step S6, air pilot valve 80 is closed, thereby the connection of workpiece W and check gauge 94 is cut off.Also cut off being communicated with between the left chamber of check gauge 94 and differential pressure pickup 92.
Then, under this state, at step S
7Carry out the mensuration that pressure is sewed.In this mensuration stage, have when the air of workpiece W is sewed since with respect to the added pressure in left chamber of differential pressure pickup 92 reduce gradually, the added pressure in left chamber of differential pressure pickup 92 and do not change, thereby the pressure reduction on both sides just is detected.
Relative therewith, when not when workpiece W air is sewed,, thereby equal zero with the pressure reduction of differential pressure pickup 92 mensuration because the pressure of 92 liang of chambers of differential pressure pickup is held equally.Like this, by resolving from the signal of differential pressure pickup 92 outputs, just can measure and whether sew and size from workpiece W air with the Control Component of not representing among the figure.
Carry out this measurement operation at step S7, and finish to sew the pressure that determinator 1 carries out and sew mensuration by pressure.After this at step S
8Carry out compressed-air actuated in the workpiece W and emit operation.That is, earlier air pilot valve 70 is closed, open electromagnetic switch valve 40 then and close electromagnetic switch valve 30.Thus, just be released to the atmosphere by the pressurized air in pipeline 6H, electromagnetic switch valve 40, pipeline 6G, the workpiece W from the valve chamber 34B of electromagnetic switch valve 30.Pressurized air in the check gauge 94 is not on the other hand emitted.
At step S
8, air elder generation valve 60 and 80 is opened, and pressurized air is supplied to check gauge 94 again.That is, revert to step S
1Initial conditions.At this moment, because the pressure in the check gauge 94 was original just very high, thereby the air supply that is imported into check gauge 94 seldom.Like this, just can save employed compressed-air actuated amount.Can also suppress the temperature rise that causes along with adiabatic compression in the check gauge 94.
Carry out from step S like this, successively
1To step S
8The mensuration that just can sew the pressure that a workpiece W carries out workpiece W of each stage.Wherein, at step S
3, before the pressurized air of measuring pressure is supplied with workpiece W, at step S
2By vacuum pump 56 air in the workpiece W is discharged.That is, the air in the workpiece W is discharged, made just pressurized air is imported after becoming decompression state in the workpiece W.
Like this, owing to can not causing the air adiabatic compression that forms along with compressed-air actuated importing, thereby the pressure variation that causes because of the temperature variation of pressurized air after importing can not take place yet.Therefore, the stable just mensuration sewed of initiation pressure immediately that import the back at pressurized air, need not wait for temperature in the workpiece W.
Like this, by the pressure variation that the adiabatic compression that prevents because of the air of workpiece W inside causes, can carry out the mensuration that accurate pressure is sewed at short notice.
Fig. 2 represents each step S
1～S
8Show equal time greatly and carry out, but in fact the desired time of each step be different, can be according to the size of workpiece W, measure pressure etc. and carry out suitable setting.
Though be that the air that the method for utilizing vacuum pump 56 exhausts originally had in before pressurized air is imported, with workpiece W is discharged in the present embodiment, also can use by cooling workpiece W to come the method for workpiece W formation decompression state.
(the 2nd embodiment)
Below, with reference to Fig. 3 the 2nd embodiment of the present invention is carried out specific description.Fig. 3 is that the pressure of expression present embodiment is sewed the integrally-built block scheme that pressure used in the assay method is sewed determinator 102.Present embodiment mainly is corresponding with the described invention of claim 2.
As shown in Figure 3, to sew the basic structure and the embodiment 1 of determinator 102 almost be same to the pressure of present embodiment.The place different with embodiment 1 is without vacuum pump 56 but evaporator 106 this point are installed and are setting pressure sensor 100 on the position different with pressure transducer 50 by pipeline 6u, switch valve 104 in pipeline 6J.
Because the front end of evaporator 106 is being closed, thereby just be trapped in the evaporator 106 by the air that switch valve 104 flow into evaporator 106.
Pressure with present embodiment of this structure is sewed pressure in the determinator 102 and is sewed that to measure be carrying out as described below.
At first, make the on off state formation of each valve and the step S of the Fig. 2 among the embodiment 1
1Identical state supplies to check gauge 94 with the pressurized air that is adjusted to the mensuration pressure of regulation by pipeline 6F, air pilot valve 60, pipeline 6P, 6Q, 6R air pilot valve 80, pipeline 6T.Begin air pilot valve 60 is closed from this state, thereby stop to supply with pressurized air to check gauge 94.
Then, electromagnetic switch valve 30 is opened, the pressurized air of regulation being measured pressure by pipeline 6G, electromagnetic switch valve 40, pipeline 6H is fed in the workpiece W.At this moment, switch valve 104 is opened simultaneously, will be in air in the workpiece W, be forced in the evaporator 106 by pipeline 6J, 6u, switch valve 104 with pressurized air.
Though the air that is forced in the evaporator 106 causes that because of being compressed temperature rises, because the heat release function of evaporator 106 just is cooled to normal temperature in the short time.Like this, the heating of the air in evaporator 106 can not produce bad influence to the pressure stability in the workpiece W.
After certain hour is carried out in compressed-air actuated supply, solenoid valve 40 cuts out, workpiece W and compressed-air supply system are cut off.At this moment pressure in the workpiece W and the pressure adjusted with pressure control assembly 20 are equal.Also switch valve 104 cuts out simultaneously.
Then, similarly to Example 1, workpiece W with after the pressure of check gauge 94 compressed airs is got into balance, air pilot valve 80 is closed, thereby the connection of workpiece W and check gauge 94 is cut off, measure pressure by differential pressure pickup 92 and sew.
Like this, in the present embodiment, when importing pressurized air in the workpiece W, just the air in the workpiece W is discharged in the evaporator 106 from workpiece W in its starting stage.Thus, in workpiece W, can not cause the adiabatic compression of air, thereby can not produce the caused pressure variation of temperature variation after pressurized air imports yet along with the pressurized air importing.
Like this, sew in the determinator 102, do not use special exhaust gear, cooling body etc. just can in the short time, carry out the mensuration that accurate pressure is sewed with simpler structure at the pressure of present embodiment.
(the 3rd embodiment)
Below, with reference to seeing that Fig. 4 specifically describes the 3rd embodiment of the present invention.Fig. 4 is the integrally-built block scheme that the pressure of expression present embodiment is sewed determinator 122.Present embodiment is main corresponding with the described invention of claim 2.
As shown in Figure 4, it is roughly same that the pressure of present embodiment is sewed the basic structure and the embodiment 2 of determinator 122.With the difference of embodiment 2 be at switch valve 104 places, replace evaporators 106 ground with muffler 120 and connecting.
The pressure that has this spline structure in use is sewed the pressure of determinator 122 and is sewed in the mensuration, stopping after check gauge 94 is supplied with pressurized air, electromagnetic switch valve 30 is opened, and by pipeline 6G, electromagnetic switch valve 40, pipeline 6H, the pressurized air of regulation being measured pressure is fed in the workpiece W.At this moment, switch valve 104 is also opened simultaneously, with pressurized air, the air that are in the workpiece W are discharged to atmosphere from muffler 120 by pipeline 6J, 6u, switch valve 104.
After the pressurized air of supplying with the stipulated time, switch valve 104 cuts out, after the workpiece W pressurized air of filling stipulated time,, thus workpiece W and compressed-air supply system are cut off again electromagnetic switch valve 40 pass valves.
Then, with embodiment 1, embodiment 2 similarly, the compressed-air actuated pressure in workpiece W and the check gauge 94 are got into balance after, air pilot valve 80 is closed, thereby the connection of workpiece W and corrective gauge 94 is cut off, carried out the mensuration that pressure is sewed by differential pressure pickup 92.
Like this, in the present embodiment,,, pass through muffler 120 from workpiece W the air in the workpiece W by importing pressurized air.Be discharged in the atmosphere.Making then becomes authorised pressure ground to its pressurization in the workpiece W.Thus, can not cause air adiabatic compression, thereby just can not produce the pressure variation that causes because of the temperature variation after the pressurized air importing yet with compressed-air actuated importing.
Like this, sew in the determinator 122 at the pressure of present embodiment, means such as different special exhaust gears, cooling bodies and with better simply structure, just carry out in the energy short time precision pressure sew mensuration.
(the 4th embodiment)
Below, with reference to seeing that Fig. 5 specifically describes the 4th embodiment of the present invention.Fig. 5 is that the pressure of expression present embodiment is sewed the integrally-built block scheme that pressure used in the assay method is sewed determinator 142.Present embodiment mainly is corresponding with the described invention of claim 3.
As shown in Figure 5, to sew basic structure and above-mentioned each embodiment of determinator 142 almost be same to the pressure of present embodiment.Be not to be connected mechanisms such as evaporator 106 on the pipeline 6J, muffler 120, on the pipeline 6E of the back of heat exchanger 22, the narrow restriction of caliber stenosis 140 be set with the difference of above-mentioned each embodiment.And, corresponding therewith, the link position of pressure transducer 24 is changed on the pipeline 6D from pipeline 6E.
The pressure that has this spline structure in use is sewed the pressure of determinator 142 and is sewed in the mensuration, stopping after check gauge 94 is supplied with pressurized air, open electromagnetic switch valve 30, by pipeline 6G, electromagnetic switch valve 40, pipeline 6H, the pressurized air of regulation being measured pressure is fed in the workpiece W.At this moment, because quantity delivered by restriction 140 limit compression air, thereby the pressure in the workpiece W can not swash suddenly and increases, the temperature rise that can cause the air adiabatic compression along with the pressurized air importing be suppressed to very little, thereby also just can not produce the pressure variation that causes because of the temperature variation after the pressurized air importing.
Like this, sew in the determinator 142 at the pressure of present embodiment, with above-mentioned each embodiment differently, by reducing the feed speed of pressurized air to workpiece W, prevent the pressure variation that the air adiabatic compression because of workpiece W inside causes.Thus, with better simply structure, just can carry out accurate pressure at short notice and sew mensuration.
All be that handle is sewed method for measuring with the mode of the pressure reduction comparison of check gauge as pressure in above-mentioned each embodiment, but also can use the method for sewing the variation of the pressure absolute value that brings by determination of pressure sensor from the pressure of workpiece without the pressure reduction manner of comparison.
Also can adopt the pressure reduction manner of comparison of not using check gauge.Adopt the part of pipeline is closed, the mode that the pressure in this airtight pipeline and the pressure in the workpiece are compared.
Though be in above-mentioned each embodiment as gas-pressurized, also available other gases air compressor 4 output pressurized air.In addition, here the switch valve of the electromagnetic switch valve 30,40 that two valve chambers alternately are connected with pipeline as the entrance side of workpiece W; Air pilot valve 60,70,80 as the switch valve in the integrated package assembly 90, but also can be other various forms of valves as switch valve.
Also can be the pressure differential detection meter of various raw modes such as diaphragm type, bellows-type as differential pressure pickup 92.
Pressure of the present invention is sewed structure, material, function, quantity, size, annexation of the content of other operations of assay method and other parts that pressure is sewed determinator etc. and all is not limited to the foregoing description.
In invention claimed in claim 1, proposed one owing to importing gas-pressurized Before, the pressure of originally staying the Bas Discharged of determinand inside is sewed mensuration side Method, thereby can prevent from compressing the pressure that causes because of the holding absolutely of air of determinand inside Change thus, just can be carried out at short notice accurate pressure and sew mensuration.
Thus, can form the extremely practical pressure that can effectively carry out high-precision mensuration leaks Let out assay method.
In invention claimed in claim 2, propose a pressure and sewed assay method, Because it is to make the sky of originally staying above-mentioned determinand inside by importing gas-pressurized Gas is discharged from determinand, thereby just can carry out in the short time with simple structure Accurate pressure is sewed mensuration.
Thus, be the extremely practical pressure that can effectively carry out with low cost high-precision measuring Sew assay method.
In invention claimed in claim 3, propose a pressure and sewed assay method, Because it is to be reduced to the unit interval import volume of gas-pressurized at determinand inner real Can not cause the degree of temperature rise with the air adiabatic compression on the matter, thereby can be with better simply Structure, the mensuration that accurate pressure is sewed of in the short time, carrying out.
Thus, formation can be carried out effectively with low cost the extremely practical pressure of high-precision measuring Power is sewed assay method.
Claims (5)
1. pressure is sewed assay method, and it is the inside that gas-pressurized is imported determinand; When the internal pressure of determinand reaches authorised pressure, end the importing of gas-pressurized; According to the minimizing degree of the internal pressure of this determinand, measure and sew then from the pressure of this determinand; It is characterized in that: the operation of having added before the inside that gas-pressurized is imported to above-mentioned determinand, the air of originally staying this determinand inside being discharged.
2. pressure is sewed assay method, and it is the inside that gas-pressurized is imported determinand; When the internal pressure of determinand reaches authorised pressure, end the importing of gas-pressurized; According to the minimizing degree of the internal pressure of this determinand, measure and sew then from the pressure of this determinand; It is characterized in that:, the air of originally staying this determinand inside is discharged by the gas-pressurized that imports in the operation starting stage that gas-pressurized is imported determinand inside.
3. pressure is sewed assay method, and it is the inside that gas-pressurized is imported determinand; When the internal pressure of this determinand reaches authorised pressure, end the importing of gas-pressurized; According to the minimizing degree of the internal pressure of this determinand, measure and sew then from the pressure of this determinand; It is characterized in that: when gas-pressurized being imported this determinand inside, be the import volume importing gas-pressurized with such time per unit, promptly import volume being reduced in fact can be compressing the degree that caused temperature rise is ignored by the air adiabatic of originally staying determinand inside.
4. sew assay method as any one described pressure in the claim 1～3, it is characterized in that: additional handlebar gas-pressurized imports check gauge inside, when this check gauge pressure inside reaches afore mentioned rules pressure, ends the operation that gas-pressurized imports; Detect the pressure reduction of determinand pressure inside and check gauge pressure inside then, thereby the pressure of measuring determinand is sewed.
5. pressure is sewed determinator, and it is provided with the pipeline that gas-pressurized is imported check gauge and check gauge inside; Gas-pressurized is imported the pipeline of determinand and determinand inside; Have Room the 1st that is communicated with check gauge and the differential pressure pickup of the Room the 2nd that is communicated with determinand, it is characterized in that: set up pipeline that above-mentioned check gauge and Room the 2nd are communicated with, be arranged on the 1st switch valve between check gauge and the Room the 2nd, be arranged on the 2nd switch valve between above-mentioned determinand and the Room the 2nd; Above-mentioned the 1st switch valve is opened when gas-pressurized imports check gauge inside, in above-mentioned differential pressure pickup mensuration process, be closed, above-mentioned the 2nd switch valve is closed when gas-pressurized imports check gauge and determinand inside, is opened in above-mentioned differential pressure pickup mensuration process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96107942 CN1167913A (en) | 1996-06-07 | 1996-06-07 | Method and apparatus for testing pressure relief |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96107942 CN1167913A (en) | 1996-06-07 | 1996-06-07 | Method and apparatus for testing pressure relief |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1167913A true CN1167913A (en) | 1997-12-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96107942 Pending CN1167913A (en) | 1996-06-07 | 1996-06-07 | Method and apparatus for testing pressure relief |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1167913A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100425964C (en) * | 2005-05-27 | 2008-10-15 | 宁波宝新不锈钢有限公司 | Measuring method for leakage of hydraulic system and its application |
| CN100545609C (en) * | 2006-06-15 | 2009-09-30 | 中国航天科技集团公司第五研究院第五一○研究所 | Adopt linear vacuum gauge to measure the device and method of orifice conductance |
| CN102967425A (en) * | 2012-12-12 | 2013-03-13 | 天津渤海化工有限责任公司天津碱厂 | Method for testing leakage of oxygen pipeline switching valves before driving |
| CN103016959A (en) * | 2012-12-12 | 2013-04-03 | 天津渤海化工有限责任公司天津碱厂 | Method for testing leakage of oxygen pipeline before driving |
| CN103154690A (en) * | 2010-09-30 | 2013-06-12 | 丰田自动车株式会社 | Leak inspection device and leak inspection method |
| CN104949808A (en) * | 2014-03-24 | 2015-09-30 | 北京北方微电子基地设备工艺研究中心有限责任公司 | Method and system for detecting leakage rate |
-
1996
- 1996-06-07 CN CN 96107942 patent/CN1167913A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100425964C (en) * | 2005-05-27 | 2008-10-15 | 宁波宝新不锈钢有限公司 | Measuring method for leakage of hydraulic system and its application |
| CN100545609C (en) * | 2006-06-15 | 2009-09-30 | 中国航天科技集团公司第五研究院第五一○研究所 | Adopt linear vacuum gauge to measure the device and method of orifice conductance |
| CN103154690A (en) * | 2010-09-30 | 2013-06-12 | 丰田自动车株式会社 | Leak inspection device and leak inspection method |
| CN103154690B (en) * | 2010-09-30 | 2015-06-17 | 丰田自动车株式会社 | Leak inspection device and leak inspection method |
| CN102967425A (en) * | 2012-12-12 | 2013-03-13 | 天津渤海化工有限责任公司天津碱厂 | Method for testing leakage of oxygen pipeline switching valves before driving |
| CN103016959A (en) * | 2012-12-12 | 2013-04-03 | 天津渤海化工有限责任公司天津碱厂 | Method for testing leakage of oxygen pipeline before driving |
| CN104949808A (en) * | 2014-03-24 | 2015-09-30 | 北京北方微电子基地设备工艺研究中心有限责任公司 | Method and system for detecting leakage rate |
| CN104949808B (en) * | 2014-03-24 | 2017-10-13 | 北京北方华创微电子装备有限公司 | A kind of leak rate detection method and system |
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