CN103883510A - Flow pressure characteristic test and experiment device for pressure buffering groove of valve plate - Google Patents
Flow pressure characteristic test and experiment device for pressure buffering groove of valve plate Download PDFInfo
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- CN103883510A CN103883510A CN201410155579.9A CN201410155579A CN103883510A CN 103883510 A CN103883510 A CN 103883510A CN 201410155579 A CN201410155579 A CN 201410155579A CN 103883510 A CN103883510 A CN 103883510A
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- 230000003139 buffering effect Effects 0.000 title claims abstract description 25
- 238000012360 testing method Methods 0.000 title claims abstract description 25
- 238000002474 experimental method Methods 0.000 title abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 22
- 239000003921 oil Substances 0.000 claims description 23
- 230000007246 mechanism Effects 0.000 claims description 18
- 230000001105 regulatory effect Effects 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 4
- 239000010720 hydraulic oil Substances 0.000 claims description 2
- 239000003350 kerosene Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 4
- 238000013461 design Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 10
- 238000012937 correction Methods 0.000 description 6
- 238000013016 damping Methods 0.000 description 6
- 239000012530 fluid Substances 0.000 description 6
- 238000004364 calculation method Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000012938 design process Methods 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000000205 computational method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004836 empirical method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005213 imbibition Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000003446 ligand Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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Abstract
The invention relates to a flow pressure characteristic test and experiment device, in particular to a flow pressure characteristic test and experiment device for a pressure buffering groove of a valve plate. The flow pressure characteristic test and experiment device for the pressure buffering groove of the valve plate resolves the problem that the flow pressure characteristic of the pressure buffering groove of the valve plate in a plunger pump can not be calculated accurately through an existing empirical value method, and comprises a hydraulic pump, a first overflowing valve, a second overflowing valve, a first pressure sensor, a first temperature sensor, a second pressure sensor, a second temperature sensor, a throttling device, a flow sensor, a throttling valve, an electromagnetic reversing valve, ground feet and a liquid storage tank, wherein the first pressure sensor and the first temperature sensor are installed on a pipeline communicated with a passage, the first overflowing valve and the hydraulic pump are connected in parallel and then communicated with the first temperature sensor through the electromagnetic reversing valve, the second pressure sensor and the second temperature sensor are installed on a pipeline communicated with a flow passage, and the second overflowing valve and the throttling valve are connected in parallel and then communicated with the flow sensor. The flow pressure characteristic test and experiment device for the pressure buffering groove of the valve plate is used for testing the flow pressure characteristic of the pressure buffering groove of the valve plate on the axial plunger pump.
Description
Technical field
The present invention relates to a kind of flow pressure characteristic test experimental device, belong to hydraulic pressure base components and manufacture field.
Background technique
Hydraulic system is widely used in industrial field, and huge contribution has been made in the raising of its automation, intellectuality and performance that is equipment in fields such as engineering machinery, equipment manufacture, Aero-Space.And oil hydraulic pump plays an important role as the energy source of this hydraulic system.Pressure in Axial Piston Pump is high, and volumetric efficiency is high, easily realizes Flow-rate adjustment, and because its sealing effect is relatively better, is applicable to, in the hydraulic system of high-power, in engineering practice, be widely used.
Traditional plunger pump design all adopts empirical method, approximate formula etc., and taking static parameter as main.And the later stage is carried out well designed result by many experiments, amendment.Such design process cost is high, the research and development of products cycle long, inefficiency.Along with the develop rapidly of computer technology, the optimal design that the means such as numerical calculation, emulation are axial piston pump provides technical support.Can obtain by simulation means the dynamic parameters of axial piston pump inner fluid, wherein, plunger cavity internal pressure is the key parameter in plunger pump, and it has directly determined the dynamic stress of plunger and cylinder body and the oil film formational situation of trunk piston set, piston shoes pair and Port Plate Pair.The existing computational methods to plunger cavity pressure are utilized the throttling formula of Flow continuity condition and plunger accent more, and the physical parameter such as flow coefficient in throttling formula while running to thrust plate transition zone for plunger replaces mainly with empirical value greatly, on thrust plate, dashpot flow pressure special parameter cannot directly be measured, and in the plunger pump that causes obtaining, thrust plate pressure buffer concentrated flow piezometric force characteristic is inaccurate.
Summary of the invention
The present invention calculates the inaccurate problem of thrust plate pressure buffer concentrated flow piezometric force characteristic in plunger pump for solving existing employing empirical value method, and then a kind of thrust plate pressure buffer concentrated flow piezometric force characteristic experimental apparatus for testing is provided.
The present invention addresses the above problem the technological scheme of taking to be: a kind of thrust plate pressure buffer concentrated flow piezometric force characteristic experimental apparatus for testing of the present invention comprises oil hydraulic pump, the first relief valve, the second relief valve, the first pressure transducer, the first temperature transducer, the second pressure transducer, the second temperature transducer, throttling arrangement, flow transducer, throttle valve, solenoid directional control valve, lower margin and liquid tank;
Described throttling arrangement comprises regulating mechanism, screwing mechanism, moving block, buffering frid and sole piece, and sole piece is arranged on lower margin; Buffering frid is embedded on the upper surface of sole piece, and moving block is arranged on the upper surface of buffering frid, on the upper surface of buffering frid, is processed with dashpot, is processed with passage on sole piece, and passage, through buffering frid, is processed with runner on moving block; Passage is connected with runner by dashpot, and moving block and sole piece are by screwing mechanism by the sealing of dashpot board clamping, and the both sides of sole piece are separately installed with a regulating mechanism, and regulating mechanism can be adjusted runner and passage distance in the horizontal direction; With on the pipeline of channel connection, the first pressure transducer and the first temperature transducer are installed, after the first relief valve is arranged in parallel with oil hydraulic pump, be communicated with the first temperature transducer by solenoid directional control valve; The second pressure transducer and the second temperature transducer are installed on the pipeline being communicated with runner, and the second relief valve is arranged in parallel afterwards and is communicated with flow transducer with throttle valve, and flow transducer is communicated with the second temperature transducer by solenoid directional control valve; Oil hydraulic pump, throttle valve, the first relief valve and the second relief valve are all communicated with liquid tank.
The invention has the beneficial effects as follows: for thering is the dashpot of various structures form, it is not the conventional throttling shapes such as sharp edge throttle orifice or long damping hole, its flow coefficient is got the error that empirical value will cause dashpot flow pressure to calculate, and finally causes the isoparametric error of calculations of plunger cavity internal pressure.In order to obtain the accurate flow pressure characteristic of thrust plate dashpot, thrust plate pressure buffer concentrated flow piezometric force characteristic experimental apparatus for testing proposed by the invention, for the Flow characteristics of dashpot provides experimental condition.Fluid between plunger cavity on apparatus of the present invention energy analog ligand flow table when transition zone and thrust plate height hydraulic fluid mouth flows, and obtain the flow pressure characteristic curve of dashpot by adjusting the pressure of dashpot both sides, obtain comparatively accurate flow coefficient, thereby flow formula is revised.Can react truly the flow pressure characteristic of damping trough by this device, we are a coefficient of data inverse flow pressure formula the inside by experiment, generally, this coefficient is all empirical value, but result and the actual conditions in fact calculated differ larger, by flow pressure characteristic curve, we can abandon the flow coefficient of experience, obtain comparatively accurate flow coefficient, thereby obtain the flow formula of revising, reduce design error, design error has reduced 5%-15%.
In addition, utilize experimental setup of the present invention, by the pressure-loaded to its both sides mouth, measure by the flow of dashpot, can realize the Flow characteristic experiment of the multiple dashpots such as triangular groove, U-shaped groove, half slot, damping hole by exchange buffering frid, can realize the stepless loading that Flow characteristics test pressure and fluid are communicated with length, and can complete different fluid, multi-operating mode, many structures and hypermedia flow pressure characteristic test, there is versatility widely.
The present invention also has compact structure, and experiment parameter obtains easily, the advantages such as low cost of manufacture, and manufacture cost has reduced 25%-35%.The present invention ensures for the flow pressure parameter accurate Calculation in plunger pump design process provides experiment, for the optimal design of the valve plate of plunger pump of the multiple operating temperature of medium lays the foundation.
Brief description of the drawings
Fig. 1 is the annexation schematic diagram of experimental setup of the present invention, Fig. 2 is the main TV structure schematic diagram of throttling arrangement of the present invention, Fig. 3 is the side view of Fig. 2, Fig. 4 is the dashpot plate structure schematic diagram of triangle buffer groove, Fig. 5 is the dashpot plate structure schematic diagram of U-shaped dashpot, Fig. 6 is the dashpot plate structure schematic diagram of semicircle dashpot, Fig. 7 is the dashpot plate structure schematic diagram with damping hole, Fig. 8 is that to be communicated with length S be 1mm flow pressure performance diagram under different differential pressure actions during to 10mm to triangular groove, Fig. 9 is that to be communicated with length S be flow coefficient correction value and the empirical value comparison diagram of 1mm during to 10mm to triangular groove, Figure 10 unloads nip inner plunger chamber dynamic pressure variation diagram in advance, Figure 11 is the A place enlarged view of Figure 10, Figure 12 is the B place enlarged view of Figure 10, Figure 13 is inner plunger chamber, pre-loading district dynamic pressure variation diagram, Figure 14 is the C place enlarged view of Figure 13, Figure 15 is the D place enlarged view of Figure 13.
Embodiment
Embodiment one: in conjunction with Fig. 1-Fig. 7 explanation, a kind of thrust plate pressure buffer concentrated flow piezometric force characteristic experimental apparatus for testing of present embodiment comprises oil hydraulic pump 11, the first relief valve 12-1, the second relief valve 12-2, the first pressure transducer 13-1, the first temperature transducer 14-1, the second pressure transducer 13-2, the second temperature transducer 14-2, throttling arrangement 15, flow transducer 16, throttle valve 17, solenoid directional control valve 19, lower margin 1 and liquid tank 18;
Described throttling arrangement 15 comprises regulating mechanism 2, screwing mechanism 5, moving block 6, buffering frid 9 and sole piece 10, and sole piece 10 is arranged on lower margin 1; Buffering frid 9 is embedded on the upper surface of sole piece 10, moving block 6 is arranged on the upper surface of buffering frid 9, on the upper surface of buffering frid 9, is processed with dashpot 9-1, on sole piece 10, is processed with path 10-1, path 10-1, through buffering frid 9, is processed with runner 6-1 on moving block 6; Path 10-1 is connected with runner 6-1 by dashpot, moving block 6 will cushion frid 9 with sole piece 10 by screwing mechanism 5 and clamp sealing, the both sides of sole piece 10 are separately installed with a regulating mechanism 2, and regulating mechanism 2 can be adjusted runner 6-1 and path 10-1 distance in the horizontal direction; The first pressure transducer 13-1 and the first temperature transducer 14-1 are installed on the pipeline being communicated with path 10-1, and the first relief valve 12-1 is arranged in parallel afterwards and is communicated with the first temperature transducer 14-1 by solenoid directional control valve 19 with oil hydraulic pump 11; The second pressure transducer 13-2 and the second temperature transducer 14-2 are installed on the pipeline being communicated with runner 6-1, the second relief valve 12-2 is arranged in parallel afterwards and is communicated with flow transducer 16 with throttle valve 17, and flow transducer 16 is communicated with the second temperature transducer 14-2 by solenoid directional control valve 19; Oil hydraulic pump 11, throttle valve 17, the first relief valve 12-1 and the second relief valve 12-2 are all communicated with liquid tank 18.
When present embodiment is used, oil hydraulic pump 11 provides hydraulic energy to whole system, adjust the pressure of dashpot one side by the first relief valve 12-1 before throttling arrangement 15, and utilize the first pressure transducer 13-1 and the first temperature transducer 14-1 to measure force value and the temperature value of dashpot one side, the variable throttle valve 17 of connecting after dashpot, adjust the pressure of dashpot opposite side with the second relief valve 12-2, utilize the second pressure transducer 13-2 and the second temperature transducer 14-2 to measure force value and the temperature value of dashpot opposite side.
In liquid tank of the present invention, also can set up fluid temperature control system, for the valve plate of plunger pump design of the multiple operating temperature of medium provides experiment to ensure.
When present embodiment is used, the outlet port of oil hydraulic pump 11 installs the first pressure gauge 21-1 additional, for monitoring the pressure of oil hydraulic pump; The second pressure gauge 21-2 is installed, the pressure when monitoring throttle valve adjustment flow on the pipeline that flow transducer 16 is communicated with throttle valve 17.On the buffering frid of present embodiment, be provided with liquid-through hole 9-2, liquid-through hole 9-2 is communicated with path 10-1, and liquid-through hole 9-2 excircle place is processed with dashpot 9-1.
Embodiment two: in conjunction with Fig. 4-Fig. 7 explanation, dashpot is triangular groove, U-shaped groove, half slot or damping hole described in present embodiment.So arrange, complete the flow pressure characteristic test of different dashpots by the dashpot of various structures form and dimensional parameters, ensure for the flow pressure parameter accurate Calculation in plunger pump design process provides experiment.Described damping hole is blind hole, on the buffering frid of present embodiment, is provided with liquid-through hole 9-2, and liquid-through hole 9-2 is communicated with path 10-1, and liquid-through hole 9-2 excircle place is processed with dashpot 9-1.Other is identical with embodiment one.
Embodiment three: in conjunction with Fig. 1 explanation, the liquid medium described in present embodiment in liquid tank 18 is hydraulic oil, kerosene or water.So arrange, can provide experiment to ensure for the valve plate of plunger pump design of the multiple operating temperature of medium.Other is identical with embodiment one or two.
Embodiment four: in conjunction with Fig. 1 explanation, screwing mechanism 5 comprises four screw rod 5-1, eight nut 5-2 and eight backing plate 5-3 described in present embodiment; Four screw rod 5-1 are vertically through moving block 6 and sole piece 10, and the two ends of each screw rod 5-1 are separately installed with backing plate 5-3 and nut 5-2.So arrange, simple in structure, reasonable in design, easy disassembly, has ensured the static seal between the gentle sloted punched plate 9 of moving block 6, buffering frid 9 and sole piece 10, reduces the error of flow measurement when eliminating each clearance leakage.Other is identical with embodiment three.
Embodiment five: in conjunction with Fig. 1 explanation, the each described adjustment structure 2 of present embodiment comprises adjusts side plate 2-1 and screw 2-2; The both sides of sole piece 10 are separately installed with an adjustment side plate 2-1 of vertical setting, and the upper horizontal rotary of each adjustment side plate 2-1 is screwed with a screw 2-2, and screw 2-2 leans on the side of moving block 6.So arrange, realized the adjustment of dashpot connection length (distance in passage and runner substantially horizontal), can complete the flow pressure characteristic test under different operating modes.Other is identical with embodiment one, two or four.
Embodiment six: in conjunction with Fig. 1 explanation, described in present embodiment, experimental setup also comprises two-position four-way solenoid valve 19, two-position four-way solenoid valve 19 is communicated with oil hydraulic pump 11 and the first temperature transducer 14-1 respectively, and two-position four-way solenoid valve 19 is communicated with the second temperature transducer 14-2 and flow transducer 16 respectively.So arrange, two-position four-way solenoid directional control valve 19 is realized path checker, and the flow direction that enters dashpot by conversion completes the flow pressure characteristic test to dashpot pre-loading on thrust plate and pre-two kinds of situations of release.Other is identical with embodiment five.
Embodiment seven: in conjunction with Fig. 2 explanation, experimental setup also comprises pipe joint 7 described in present embodiment, and path 10-1 and runner 6-1 are connected with respectively pipe joint 7.So arrange, assembly and disassembly is easy to use.Other is identical with embodiment one, two, four or six.
Embodiment eight: in conjunction with Fig. 1 explanation, experimental setup also comprises liquid-filter 20 described in present embodiment, on the pipeline that oil hydraulic pump 11 is communicated with liquid tank 18, liquid-filter 20 is installed, the pipe that throttle valve 17 is communicated with liquid tank 18 on liquid-filter 20 is installed.So arrange, be convenient to consider at any time except the impurity in liquid tank in experimentation, ensure the trouble-free operation of experiment.Other is identical with embodiment seven.
Working procedure: in conjunction with Fig. 1-Figure 15 explanation, oil hydraulic pump 11 starts to rotate to form imbibition pressure under the drive of motor, and pressure liquid enters pipeline through oil hydraulic pump 11.In the time that solenoid directional control valve 19 is not charged, access liquid road, left position, pressure liquid enters throttling arrangement 15, the first pressure transducer 13-1 through the left position of solenoid directional control valve 19 and the first temperature transducer 14-1 measures upstream pressure and temperature; Oil return is measured downstream pressure and temperature through solenoid directional control valve 15, the second pressure transducer 13-2 and the second temperature transducer 14-2.Flow through flow transducer 16, the second relief valve 12-2, throttle valve 17 and oil purifier 20-2 oil sump tank.
Charged when solenoid directional control valve 19, liquid road is accessed in right position.Pressure liquid enters from throttling arrangement 15 right sides, and the second pressure transducer 13-2 and the second temperature transducer 14-2 measure upstream pressure and temperature, and the first pressure transducer 13-1 and the first temperature transducer 14-1 measure downstream pressure and temperature.
In Fig. 9 of the present invention, dotted line represents the empirical value of flow coefficient, the solid line of band fork represents the correction value of flow coefficient, Figure 10 presses over time curve (solid line represents the correction value curve that utilizes experimental setup of the present invention to obtain for unloading in advance in nip inner plunger chamber, dotted line represents empirical value curve), Figure 11 is the A place enlarged view of Figure 10, and a large figure is put at the B place that Figure 12 is Figure 10; Figure 13 presses over time curve (solid line represents the correction value curve that utilizes experimental setup of the present invention to obtain in inner plunger chamber, pre-loading district, dotted line represents empirical value curve), Figure 14 is the C place enlarged view of Figure 13, Figure 15 is the D place enlarged view of Figure 13, as seen from the figure, unload in advance under the time identical in nip, in the plunger cavity that utilizes experimental setup of the present invention to obtain, press correction value lower than empirical value, reduce design error; In pre-loading district under identical time, in the plunger cavity that utilizes experimental setup of the present invention to obtain, press correction value higher than empirical value, reduce design error, experimental setup of the present invention can lay the foundation and provide safeguard for the optimal design of the valve plate of plunger pump of the multiple operating temperature of medium.
Claims (8)
1. a thrust plate pressure buffer concentrated flow piezometric force characteristic experimental apparatus for testing, is characterized in that: it comprises oil hydraulic pump (11), the first relief valve (12-1), the second relief valve (12-2), the first pressure transducer (13-1), the first temperature transducer (14-1), the second pressure transducer (13-2), the second temperature transducer (14-2), throttling arrangement (15), flow transducer (16), throttle valve (17), solenoid directional control valve (19), lower margin (1) and liquid tank (18);
Described throttling arrangement (15) comprises regulating mechanism (2), screwing mechanism (5), moving block (6), buffering frid (9) and sole piece (10), and sole piece (10) is arranged on lower margin (1); Buffering frid (9) is embedded on the upper surface of sole piece (10), moving block (6) is arranged on the upper surface of buffering frid (9), on the upper surface of buffering frid (9), be processed with dashpot (9-1), on sole piece (10), be processed with passage (10-1), on moving block (6), be processed with runner (6-1); Passage (10-1) is connected with runner (6-1) by dashpot (9-1), moving block (6) will cushion frid (9) with sole piece (10) by screwing mechanism (5) and clamp sealing, the both sides of sole piece (10) are separately installed with a regulating mechanism (2), and regulating mechanism (2) can be adjusted runner (6-1) and passage (10-1) distance in the horizontal direction; The first pressure transducer (13-1) and the first temperature transducer (14-1) are installed on the pipeline being communicated with passage (10-1), and the first relief valve (12-1) is arranged in parallel afterwards and is communicated with the first temperature transducer (14-1) by solenoid directional control valve (19) with oil hydraulic pump (11); The second pressure transducer (13-2) and the second temperature transducer (14-2) are installed on the pipeline being communicated with runner (6-1), the second relief valve (12-2) is arranged in parallel afterwards and is communicated with flow transducer (16) with throttle valve (17), and flow transducer (16) is communicated with the second temperature transducer (14-2) by solenoid directional control valve (19); Oil hydraulic pump (11), throttle valve (17), the first relief valve (12-1) and the second relief valve (12-2) are all communicated with liquid tank (18).
2. a kind of thrust plate pressure buffer concentrated flow piezometric force characteristic experimental apparatus for testing according to claim 1, is characterized in that: described dashpot (9-1) is triangular groove, U-shaped groove or half slot.
3. a kind of thrust plate pressure buffer concentrated flow piezometric force characteristic experimental apparatus for testing according to claim 1 and 2, is characterized in that: the liquid medium in described liquid tank (18) is hydraulic oil, kerosene or water.
4. a kind of thrust plate pressure buffer concentrated flow piezometric force characteristic experimental apparatus for testing according to claim 3, is characterized in that: described screwing mechanism (5) comprises four screw rods (5-1), eight nuts (5-2) and eight backing plates (5-3); Four screw rods (5-1) are vertically through moving block (6) and sole piece (10), and the two ends of each screw rod (5-1) are separately installed with backing plate (5-3) and nut (5-2).
5. according to a kind of thrust plate pressure buffer concentrated flow piezometric force characteristic experimental apparatus for testing described in claim 1,2 or 4, it is characterized in that: each described adjustment structure (2) comprises adjusts side plate (2-1) and screw (2-2); The both sides of sole piece (10) are separately installed with an adjustment side plate (2-1) of vertical setting, and the upper horizontal rotary of each adjustment side plate (2-1) is screwed with a screw (2-2), and screw (2-2) leans on the side of moving block (6).
6. a kind of thrust plate pressure buffer concentrated flow piezometric force characteristic experimental apparatus for testing according to claim 5, it is characterized in that: described experimental setup also comprises two-position four-way solenoid valve (19), two-position four-way solenoid valve (19) is communicated with oil hydraulic pump (11) and the first temperature transducer (14-1) respectively, and two-position four-way solenoid valve (19) is communicated with the second temperature transducer (14-2) and flow transducer (16) respectively.
7. according to a kind of thrust plate pressure buffer concentrated flow piezometric force characteristic experimental apparatus for testing described in claim 1,2,4 or 6, it is characterized in that: described experimental setup also comprises pipe joint (7), passage (10-1) and runner (6-1) are connected with respectively pipe joint (7).
8. a kind of thrust plate pressure buffer concentrated flow piezometric force characteristic experimental apparatus for testing according to claim 7, it is characterized in that: described experimental setup also comprises the first liquid-filter (20-1) and the second liquid-filter (20-2), on the pipeline that oil hydraulic pump (11) is communicated with liquid tank (18), the first liquid-filter (20-1) is installed, the pipe that throttle valve (17) is communicated with liquid tank (18) on the second liquid-filter (20-2) is installed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410155579.9A CN103883510B (en) | 2014-04-17 | 2014-04-17 | A kind of thrust plate pressure buffer concentrated flow piezometric force characteristic experimental apparatus for testing |
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| CN201410155579.9A CN103883510B (en) | 2014-04-17 | 2014-04-17 | A kind of thrust plate pressure buffer concentrated flow piezometric force characteristic experimental apparatus for testing |
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| CN103883510B CN103883510B (en) | 2016-04-13 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI667562B (en) * | 2017-03-28 | 2019-08-01 | 日商富士金股份有限公司 | Pressure type flow control device and flow control method |
| CN112113871A (en) * | 2020-09-18 | 2020-12-22 | 哈尔滨工业大学 | Surface microstructure fluid erosion resistance testing device |
| CN112762054A (en) * | 2021-01-14 | 2021-05-07 | 哈尔滨工业大学 | Comprehensive hydraulic valve performance test system |
| CN113065212A (en) * | 2021-04-09 | 2021-07-02 | 哈尔滨理工大学 | Motor combination pressure buffer tank structure design method based on bird swarm algorithm |
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| CN113065212A (en) * | 2021-04-09 | 2021-07-02 | 哈尔滨理工大学 | Motor combination pressure buffer tank structure design method based on bird swarm algorithm |
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| Publication number | Publication date |
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| CN103883510B (en) | 2016-04-13 |
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