CN104897351A - Method and system for testing air tightness of welding diaphragm type energy storage pressure container - Google Patents
Method and system for testing air tightness of welding diaphragm type energy storage pressure container Download PDFInfo
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- CN104897351A CN104897351A CN201510266567.8A CN201510266567A CN104897351A CN 104897351 A CN104897351 A CN 104897351A CN 201510266567 A CN201510266567 A CN 201510266567A CN 104897351 A CN104897351 A CN 104897351A
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Abstract
The invention discloses a method and a system for testing the air tightness of a welded diaphragm type energy storage pressure container. The method comprises the following steps: s1, recording the pre-charging pressure value of the accumulator as P0The pressure sensor collects the pressure value of the liquid end of the energy accumulator in real time; s2, drawing a diaphragm opening pressure test curve at least comprising a first pressure test curve and a second pressure test curve by the controller; respectively carrying out linear fitting on the diaphragm opening pressure values to obtain an intersection point of two straight lines, wherein the intersection point is the diaphragm opening pressure value P; s3, testing different pre-inflation pressure values P0The opening pressure value P of the corresponding diaphragm is drawn0-P calibration curve; s4, setting the pre-charging pressure value to be P1Carrying out fatigue test on the energy accumulator; testing to obtain a diaphragm opening pressure value P'; s5, drawing P0-P calibration curve, obtaining a calibrated pre-inflation pressure value P1' and amount of pre-charge pressure loss of the diaphragm. The testing method provides a testing method and a reference basis for selection of the energy accumulator diaphragm material, design of the structural shape and evaluation of the use performance.
Description
Technical field
The invention belongs to air tightness performance technical field of measurement and test, particularly a kind of method and system of testing welding diaphragm type energy-storage pressure container air-tightness.
Background technology
Accumulator is servicing unit conventional in hydropneumatic system, in hydropneumatic system, mainly play storage and relief pressure energy, also can be used as the device absorbing and eliminate pressure fluctuation and uses.Accumulator has many types, comprises piston type, bladder, spring and diaphragm type etc.Wherein weld diaphragm accumulator and have that volume is little, lightweight, response is fast, can the feature such as repeated inflation, be therefore used widely in hydropneumatic system.
Welding diaphragm accumulator, utilizes the barrier film be arranged in the middle of accumulator the gas end of accumulator and liquid end to be kept apart.Accumulator before use, seals after need carrying out pre-inflated with nitrogen to gas end; Its liquid end is communicated with hydraulic system.When accumulator uses, barrier film ceaselessly stirs up and down along with the change of pressure in hydraulic system.Wherein the pressure variations influence of the pre-inflated with nitrogen of gas end the usability of accumulator, but the impermeability of barrier film directly affects the pressure of the pre-inflated with nitrogen of gas end.The good barrier film of impermeability can ensure that the charge pressure of accumulator gas end is after carrying out N fatigue and cyclic, still maintains the level suitable with initial pre-charging pressure; And the inferior barrier film of impermeability can make accumulator gas end charge pressure reduce within a short period of time, have a strong impact on the usability of accumulator, also greatly can reduce the serviceable life of barrier film simultaneously.Therefore, the bubble-tight quality of barrier film is particularly crucial to accumulator, and the impermeability of how to test barrier film becomes problem demanding prompt solution.
Summary of the invention
The present invention is in order to overcome above-mentioned the deficiencies in the prior art, provide a kind of method and system of testing welding diaphragm type energy-storage pressure container air-tightness, the method of this test welding diaphragm type energy-storage pressure container air-tightness is for Obtaining Accurate and evaluate the bubble-tight good and bad degree of energy accumulator diaphragm and provide reliable means of testing, also for the choosing of energy accumulator diaphragm material, the design of planform and the evaluation of usability provide test method and reference frame; This test macro is that the bubble-tight good and bad degree of test energy accumulator diaphragm provides firm material base.
For achieving the above object, present invention employs following technical scheme:
Test a method for welding diaphragm type energy-storage pressure container air-tightness, comprise the steps:
S1, by the gas end preliminary filling working gas of accumulator, the pre-charging pressure value of this working gas is designated as P
0, the liquid end of described accumulator is slowly pressurizeed; Be arranged on the force value of this accumulator liquid end of pressure transducer Real-time Collection at described accumulator liquid end place, the force value collected is transferred to controller by described pressure transducer;
S2, described controller, according to the force value received, draw the barrier film opening pressure test curve of described accumulator; This test curve at least comprise accumulator is exerted pressure before diaphragm deflection after test the first pressure test curve of gained and diaphragm deflection after accumulator is exerted pressure after test the second pressure test curve of gained; Described controller carries out linear fit to the first pressure test curve and the second pressure test curve respectively, obtains the intersection point of two straight lines and these two straight lines, and this intersection point is and pre-charging pressure value P
0corresponding barrier film opening pressure value P;
S3, repetition step S1, S2, test described accumulator at different pre-charging pressure value P
0time corresponding barrier film opening pressure value P, and according to test the data obtained, draw pre-charging pressure value P
0with the P of barrier film opening pressure value P
0-P calibration curve;
S4, the pre-charging pressure value of described accumulator gas end is set to P
1, torture test is carried out to described accumulator; After N fatigue and cyclic, draw the barrier film opening pressure value P ' of described accumulator according to step S1, S2 test;
S5, the P drawn according to step S3
0-P calibration curve, obtains barrier film opening pressure value P ' at P
0demarcation pre-charging pressure value P corresponding in-P calibration curve
1', this demarcation pre-charging pressure value P
1' for remaining the force value of preliminary filling working gas after experience torture test; Thus obtain the barrier film pre-charging pressure waste of the good and bad degree of the reflection barrier film impermeability corresponding with N fatigue and cyclic: P
1-P
1'.
Realize a method testing system of testing welding diaphragm type energy-storage pressure container air-tightness, at least comprise hydraulic pump 1, accumulator 4, controller 5; The inside of described accumulator 4 is provided with barrier film, and the inside of described accumulator 4 is divided into gas end and liquid end two parts by this barrier film; The liquid end of described accumulator 4 is connected by the liquid outlet of fluid circuit 2 with described hydraulic pump 1, and the liquid end of described accumulator 4 is also provided with the pressure transducer 3 for gathering this liquid end pressure; The signal output part of described pressure transducer 3 is connected with the signal input part of described controller 5; The gas end of described accumulator 4 is filled with working gas in advance.
The present invention can also be realized further by following steps.
Preferably, described accumulator 4 is welding diaphragm type energy-storage pressure container.
Beneficial effect of the present invention is: first the present invention describes how to test energy accumulator diaphragm opening pressure value; Secondly, the barrier film opening pressure value corresponding to different pre-charging pressure values of test accumulator gas end; Then according to the barrier film opening pressure value of test gained, the calibration curve that pre-charging pressure value is relevant to barrier film opening pressure value is drawn.Finally the pre-charging pressure value of accumulator gas end is set as P
1after, the torture test that fatigue life cycle is N time is carried out to accumulator; Measure N fatigue and cyclic metacneme opening pressure value P ' again; The corresponding demarcation pre-charging pressure value P of barrier film opening pressure value P ' is found out according to calibration curve
1'; Relatively pre-charging pressure value P
1with demarcation pre-charging pressure value P
1' size, the pressure loss amount that accumulator often experiences its barrier film after N fatigue and cyclic can be obtained, thus reflect the bubble-tight good and bad degree of energy accumulator diaphragm.Method method in the present invention is welded diaphragm type energy-storage pressure container air-tightness for test and is provided a kind of easy reliable means of testing, can obtain and evaluate the quality of welding diaphragm type energy-storage pressure container air-tightness performance by accurate quantitative analysis, for the choosing of welding diaphragm accumulator diaphragm material, the design of version and the evaluation of usability provide test method and reference frame.Meanwhile, the test macro in the present invention provides good hardware foundation, the advantages such as it is simple that this test macro also has structure, easy to operate for the quality of test energy accumulator diaphragm air tightness performance.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of test macro in the present invention;
Fig. 2 is septation opening pressure test curve figure of the present invention;
Fig. 3 is P in the present invention
0-P calibration map.
In figure, the implication of label symbol is as follows:
1-hydraulic pump, 2-fluid circuit, 3-pressure transducer
4-accumulator, 5-controller
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, a kind of test macro welding diaphragm type energy-storage pressure container air-tightness, comprises hydraulic pump 1, accumulator 4 and controller 5; The internal welding of described accumulator 4 is connected to barrier film, and described accumulator 4 interior separation is become gas end and liquid end two parts; The liquid end of described accumulator 4 is connected by the liquid outlet of fluid line 2 with hydraulic pump 1, the liquid end of described accumulator 4 is also provided with the pressure transducer 3 for gathering this liquid end pressure, and the signal output part of described pressure transducer 3 is connected with the signal input part of described controller 5; The gas end of described accumulator 4 is filled with nitrogen in advance.
For welding the method in the test macro of diaphragm type energy-storage pressure container air-tightness, comprise the steps:
S1: the gas end preliminary filling working gas of described accumulator 4, this working gas is nitrogen or inert gas, and the pre-charging pressure value of described working gas is designated as P
0, the liquid end of described hydraulic pump 1 to described accumulator 4 slowly pressurizes, and passes through the force value of pressure transducer 3 Real-time Collection accumulator 4 liquid end, and the force value collected is transferred to described controller 5 by described pressure transducer 3;
S2: described controller 5 records the force value received, and the barrier film opening pressure test curve of accumulator 4 is drawn according to the force value that receives, before this test curve at least comprises diaphragm deflection, accumulator is exerted pressure the second pressure test curve of test gained of exerting pressure to accumulator after the first pressure test curve of test gained and diaphragm deflection; First test curve and the second test curve are carried out Linear Quasi according to the tendency of the first pressure test curve and the second pressure test curve and synthesize two sections of straight lines and matched curve 1 and matched curve 2 by described controller respectively, and the intersection point that matched curve 1 and matched curve 2 are intersected is the pre-charging pressure value P of described accumulator 4 gas end
0corresponding barrier film opening pressure value is P, and described barrier film opening pressure test curve also comprises too small pressure test curve of ignoring of not exerting pressure to accumulator or exert pressure, as shown in Figure 2;
S3: a series of different pre-charging pressure value P of test accumulator 4 gas end
0corresponding barrier film opening pressure value P, described pre-charging pressure value P
0be respectively 3.5MPa, 4.0MPa, 4.5MPa, 5.0MPa, 5.5MPa, repeat step S1, S2 and can obtain this five barrier film opening pressure values corresponding to five pre-charging pressure values; Described controller, according to five the barrier film opening pressure value P obtained, draws pre-charging pressure value P
0the P relevant to barrier film opening pressure value P
0-P calibration curve, as shown in Figure 3;
S4: the pre-charging pressure value of described accumulator 4 gas end is set to P
1, this P
1=5.0MPa, carries out to described accumulator 4 torture test that fatigue life cycle is N=10 ten thousand times; After 100,000 torture tests, test the barrier film opening pressure value P ' of described accumulator 4 according to step S1, S2, this P '=4.12MPa;
S5: according to the P obtained in step S3
0-P calibration curve, finds out barrier film opening pressure value P ' at P
0demarcation pre-charging pressure value P corresponding in-P calibration curve
1', this demarcation pre-charging pressure value P
1'=4.15MPa, described demarcation pre-charging pressure value P
1' for remaining the force value of preliminary filling working gas after experience torture test; Relatively pre-charging pressure value P
1with demarcation pre-charging pressure value P
1' size, i.e. P
1-P
1'=5.0-4.15=0.85MPa, and in conjunction with the fatigue life cycle 100,000 that torture test is experienced, after quantitatively can often being experienced 100,000 fatigue and cyclic, the pressure loss amount of the pre-inflated with nitrogen of barrier film is 0.85MPa, thus reflects the bubble-tight good and bad degree of barrier film.
Claims (3)
1. test a method for welding diaphragm type energy-storage pressure container air-tightness, comprise the steps:
S1, by the gas end preliminary filling working gas of accumulator, the pre-charging pressure value of this working gas is designated as P
0, the liquid end of described accumulator is slowly pressurizeed; Be arranged on the force value of this accumulator liquid end of pressure transducer Real-time Collection at described accumulator liquid end place, the force value collected is transferred to controller by described pressure transducer;
S2, described controller, according to the force value received, draw the barrier film opening pressure test curve of described accumulator; This test curve at least comprise accumulator is exerted pressure before diaphragm deflection after test the first pressure test curve of gained and diaphragm deflection after accumulator is exerted pressure after test the second pressure test curve of gained; Described controller carries out linear fit to the first pressure test curve and the second pressure test curve respectively, obtains the intersection point of two straight lines and these two straight lines, and this intersection point is and pre-charging pressure value P
0corresponding barrier film opening pressure value P;
S3, repetition step S1, S2, test described accumulator at different pre-charging pressure value P
0time corresponding barrier film opening pressure value P, and according to test the data obtained, draw pre-charging pressure value P
0with the P of barrier film opening pressure value P
0-P calibration curve;
S4, the pre-charging pressure value of described accumulator gas end is set to P
1, torture test is carried out to described accumulator; After N fatigue and cyclic, draw the barrier film opening pressure value P ' of described accumulator according to step S1, S2 test;
S5, the P drawn according to step S3
0-P calibration curve, obtains barrier film opening pressure value P ' at P
0demarcation pre-charging pressure value P corresponding in-P calibration curve
1', this demarcation pre-charging pressure value P
1' for remaining the force value of preliminary filling working gas after experience torture test; Thus obtain the barrier film pre-charging pressure waste of the good and bad degree of the reflection barrier film impermeability corresponding with N fatigue and cyclic: P
1-P
1'.
2. realize, as right wants the test as described in 1 to weld a method testing system for diaphragm type energy-storage pressure container air-tightness, it is characterized in that: at least comprise hydraulic pump (1), accumulator (4), controller (5); The inside of described accumulator (4) is provided with barrier film, and the inside of described accumulator (4) is divided into gas end and liquid end two parts by this barrier film; The liquid end of described accumulator (4) is connected by the liquid outlet of fluid circuit (2) with described hydraulic pump (1), and the liquid end of described accumulator (4) is also provided with the pressure transducer (3) for gathering this liquid end pressure; The signal output part of described pressure transducer (3) is connected with the signal input part of described controller (5); The gas end of described accumulator (4) is filled with working gas in advance.
3. test macro according to claim 2, is characterized in that: described accumulator (4) is welding diaphragm type energy-storage pressure container.
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| CN201510266567.8A CN104897351B (en) | 2015-05-22 | 2015-05-22 | Method and system for testing air tightness of welding diaphragm type energy storage pressure container |
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| CN104897351B CN104897351B (en) | 2017-06-30 |
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Cited By (2)
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| CN108507890A (en) * | 2018-03-21 | 2018-09-07 | 合肥通用机械研究院有限公司 | A kind of pressure vessel and piping corrosion fatigue testing system and test method |
| CN109983318A (en) * | 2017-02-20 | 2019-07-05 | 株式会社富士金 | Abnormal detector, abnormality detection system, method for detecting abnormality and the fluid control of fluid control |
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Address after: 230031 No. 888 Changjiang West Road, Shushan District, Anhui, Hefei Patentee after: HEFEI GENERAL MACHINERY RESEARCH INSTITUTE Co.,Ltd. Address before: 230031 No. 888 Changjiang West Road, Shushan District, Anhui, Hefei Patentee before: HEFEI GENERAL MACHINERY Research Institute |