CN101709701A - Single-cylinder multistage gas-compression rolling piston compressor - Google Patents
Single-cylinder multistage gas-compression rolling piston compressor Download PDFInfo
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- CN101709701A CN101709701A CN200910254433A CN200910254433A CN101709701A CN 101709701 A CN101709701 A CN 101709701A CN 200910254433 A CN200910254433 A CN 200910254433A CN 200910254433 A CN200910254433 A CN 200910254433A CN 101709701 A CN101709701 A CN 101709701A
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Abstract
The invention discloses a single-cylinder multistage gas-compression rolling piston compressor which comprises an electric drive element and a pump body, wherein the electric drive element comprises a stator and a rotor which are arranged in an inclosed shell, and the pump body is driven by the electric drive element; a rolling piston driven by a crankshaft connected with the rotor is arranged in the pump body; only one gas cylinder is arranged in the pump body; the wall of a gas cylinder hole is provided with more than two gliding slab slots in the axial direction of the gas cylinder hole; a gliding slab is arranged in each gliding slab slot; and the gliding slabs divide the crescent space between the outer circumference of the rolling piston and the gas cylinder hole into more than two multistage working chambers. The single-cylinder multistage gas-compression rolling piston compressor is characterized in that the included angles between every two gliding slabs are not the same; the capacity of the prior stage working chamber is greater than that of the later stage working chamber; the positions on the working chambers, which abut against the two gliding slab slots, are respectively provided with a gas inlet and a gas outlet of the working chamber; and the gas inlet and the gas outlet are orderly arranged in the rotation direction of the rolling piston. The single-cylinder multistage gas-compression rolling piston compressor of the invention can realize multistage compression under the condition of a single-cylinder system and reduce the components of the multistage compressor.
Description
Technical field
The present invention relates to a kind of multistage compressor, particularly a kind of rolling piston compressor of single-cylinder multistage gas compression.
Background technique
Realize the two-stage gas compression with the rolling piston compressor principle, patented technology in the past, as: SANYO GS at Chinese patents CN 1371453A, as shown in Figure 1, in this patent to CO
2The technological scheme that working medium is carried out two stage compression is: drive the pump housing 3 that the 1st and the 2nd revolution compressing member 4 and 5 is formed simultaneously by electric element 2, this pump housing 3 is made up of two cylinder arrangement, refrigeration working medium compresses by the two cylinder arrangement of the pump housing, forms two stage compression.Its working procedure is: refrigeration working medium carries out the one-level compression through two cylinder two stage compression first revolution compressing members 4, gaseous emission after the compression is in seal container 1, and the intermediate pressure gas body of this discharge is undertaken directly being discharged to seal container 1 working substance system outward after the secondary compression by two cylinder two stage compression second revolution compressing members 5.Because this pair of cylinder two stage compression has the structure of two compressing members, its shortcoming is: need the compressor amount of parts of assembling many, assembling process complexity, technology cost height.
Summary of the invention
Technical problem to be solved by this invention is that a kind of amount of parts of proposition is less, the low above rolling piston compressor of single cylinder two-stage that can reach the two-stage gas compression function simultaneously of technology cost.
For reaching above purpose, the present invention takes following technological scheme to be achieved:
A kind of rolling piston compressor of single-cylinder multistage gas compression, comprise the electric element formed by stator and rotor in the closed shell and the pump housing of this electric element driving, be provided with a rolling piston that drives by the bent axle that connects rotor in the pump housing, only be provided with a cylinder in the pump housing, cylinder-bore radially is provided with two above vane slots in the cylinder-bore hole wall upper edge of cylinder, slide plate all is housed in each vane slot, slide plate selenodont space segmentation between following rolling piston excircle of the effect of spring and cylinder-bore is two above multistage operating chambeies, it is characterized in that, angle between the slide plate is unequal, the previous stage active chamber is bigger than back one-level working chamber volume successively, each active chamber is provided with the intakeport and the relief opening of this active chamber respectively near two vane slot places, intakeport and relief opening are provided with along the rolling piston sense of rotation successively, after gas sucks from compressor, after beginning compression and discharge from the one-level active chamber by this active chamber relief opening, enter level work chamber, back successively, after the compression of multistage operating chamber, be expelled to external pipeline system by afterbody active chamber relief opening.
In the such scheme, be provided with two vane slots in that the cylinder-bore hole wall upper edge of cylinder cylinder-bore is radially asymmetric, slide plate all is housed in each vane slot, and two slide plates selenodont space segmentation between following rolling piston excircle of the effect of spring and cylinder-bore is the one-level active chamber of big volume and the secondary work chamber of a less volume; Each active chamber is provided with the intakeport and the relief opening of this active chamber respectively near two vane slot places, intakeport and relief opening are provided with along the rolling piston sense of rotation successively, low-pressure gas sucks the compressed medium pressure gas that becomes of one-level active chamber from pipe-line system by one-level active chamber intakeport, medium pressure gas directly is drained into compressor closed shell inside from one-level active chamber exhaust port, directly suck by secondary work chamber intakeport again, after the compression of secondary work chamber, medium pressure gas becomes pressurized gas, is expelled to the pipe-line system of closed shell outside at last by secondary work chamber relief opening.
The described medium pressure gas that directly is drained into compressor closed shell inside also can be incorporated into the intakeport in secondary work chamber by a pipe on the closed shell outside closed shell, the intakeport in secondary work chamber is compressed after medium pressure gas is sucked, medium pressure gas becomes and is pressurized gas, directly is expelled to the outer pipe-line system of closed shell by exhaust outlet of compressor at last.
In the air intake passage in described multistage operating chamber, Aspirating valves is installed.
The slide plate thickness of close previous stage active chamber intakeport is greater than the slide plate thickness near back one-level active chamber intakeport.
Compare with existing two cylinder arrangement gas compressor, the rolling piston compressor of single-cylinder multistage gas compression of the present invention can be realized the multistage compression under the single cylinder system situation, has that the component of being are few, assembling process is simple, the advantage that the technology cost is low.
Description of drawings
Fig. 1 is existing a kind of twin-tub two stage compressor structural representation.
Fig. 2 is single cylinder two-stage CO of the present invention
2Working medium compressor schematic representation.
Fig. 3 is the single cylinder two-stage CO2 working medium compressor A-A generalized section of Fig. 2.
Fig. 4 is the B-B generalized section of Fig. 3.
Fig. 5 is a single cylinder two-stage CO2 working medium compressor operating schematic flow sheet of the present invention.
Fig. 6 is a single cylinder three stage compressor structural representation of the present invention.
The reference character of Fig. 1 in Fig. 6:
1 closed shell, 2 electric elements, 2-1 stator, the 2-2 rotor, 3 pump housings, 3-1 cylinder, the 3-1-1 cylinder-bore, 3-1-2 hole wall, 3-1-3 vane slot 1,3-1-8 vane slot 2,3-1-9 vane slot 3,3-1-4 crescent-shaped space, 3-1-5 one-level active chamber, 3-1-6 secondary work chamber, 3-1-7 three level work chambeies, 3-2-1 slide plate 1,3-2-2 slide plate 2,3-2-3 slide plate 3, the 3-3 spring, 3-4 rolling piston, 3-5 exhaust valve plate, 3-6 one-level intakeport, 3-7 one-level relief opening, 3-8 secondary intakeport, 3-9 secondary relief opening, three grades of intakepories of 3-10, three grades of relief openings of 3-11, the 3-14 bent axle, 3-15 exhaust outlet of compressor, 3-16 upper bearing (metal), the 3-17 lower bearing, 4 pairs of cylinder two stage compression first turning members, 5 pairs of cylinder two stage compression second turning members, Φ rolling piston rotation angle.
Embodiment
The present invention is described in further detail below in conjunction with drawings and the specific embodiments.
As Fig. 2, Fig. 3 and shown in Figure 4, be a kind of single cylinder two-stage CO
2The compression rolling piston compressor, be provided with the electric element of forming by stator 2-1 and rotor 2-2 2 in its closed shell 1, and the pump housing 3 that drives by this electric element 2, the pump housing 3 is made up of cylinder 3-1, two slide plate 3-2-1,3-2-2, two sliding blade spring 3-3, bent axle 3-14, rolling piston 3-4, upper bearing (metal) 3-16, lower bearing 3-17, outlet valve 3-5 and the bolt that connects above-mentioned part.
On the hole wall 3-1-2 of the cylinder-bore 3-1-1 of described cylinder 3-1, two vane slots have been disposed radially, the first vane slot 3-1-3, in the first slide plate 3-2-1 is housed, the second slide plate 3-2-2 is housed in the second vane slot 3-1-8, two vane slots are not 180 ° at the circumferential angle of cylinder-bore 3-1-1, are 158 °.Two interior slide plate 3-2-1,3-2-2 of vane slot are divided into big volume active chamber to the selenodont space 3-1-4 between the periphery of rolling piston 3-4 and the cylinder bore wall 3-1-2, with a less volume active chamber, big volume active chamber is referred to as one-level active chamber 3-1-5, and less volume active chamber is referred to as secondary work chamber 3-1-6.Be provided with intakeport and relief opening at each active chamber respectively near two vane slot 3-1-3,3-1-8 place, suction, relief opening along the ordering of rolling piston revolution direction setting are: one-level intakeport 3-6, one-level relief opening 3-7, secondary intakeport 3-8, secondary relief opening 3-9.
In order to make compressor can have service behaviour and reliability preferably, in the air intake passage in described one-level active chamber and secondary work chamber, Aspirating valves 3-5 is installed, can effectively stop to suck the gas refluence, can make the swept volume of cylinder increase 40% ~ 80%.
In addition, because the gas working medium pressure that secondary relief opening 3-9 discharges is greater than the gas pressure that one-level relief opening 3-7 discharges.In order to guarantee the reliability of compressor operating, be in the first slide plate 3-2-1 thickness between one-level active chamber intakeport 3-6 and the secondary work chamber relief opening 3-9 at compressor and be not less than the second slide plate 3-2-2 thickness between described one-level active chamber relief opening 3-7 and the secondary work chamber intakeport 3-8; Simultaneously, be in the first slide plate 3-2-1 between one-level active chamber intakeport 3-6 and the secondary work chamber relief opening 3-9 and the slip antifriction performance between the first vane slot 3-1-3 and also be better than being in the second slide plate 3-2-2 between described one-level active chamber relief opening 3-7 and the secondary work chamber intakeport 3-8 and the antifriction performance between the second vane slot 3-1-8.
As shown in Figure 5, in each active chamber, the point of contact of the hole wall 3-1-2 of the periphery of rolling piston 3-4 and cylinder-bore is divided into two-part with this active chamber, and the part that communicates with intakeport is called air aspiration cavity, and what communicate with exhaust port is called the compression exhaust chamber.As bent axle 3-14 during by electric element 2 driven rotary, the periphery of rolling piston 3-4 is when the hole wall 3-1-2 of cylinder-bore rolls, and air aspiration cavity and compression exhaust chamber alternately occur in one-level active chamber 3-1-5 and secondary work chamber 3-1-6.In bent axle 3-14 rotated a circle process, that each active chamber is finished once was air-breathing, the process of compression and exhaust.
The working medium flow process of compressor is:
As shown in Figure 3, at the one-level active chamber 3-1-5 gas that duplex matter system comes outside one-level intakeport 3-6 sucks closed shell 1 after compression, be discharged in the described closed shell 1 by one-level relief opening 3-7, the gas that one-level active chamber 3-1-5 is discharged is incorporated into secondary intakeport 3-8 (or directly injecting) by the air entraining pipe on the closed shell 1 in closed shell 1, through secondary work chamber 3-1-6 compress once more boost after, be discharged to the outer duplex matter system of closed shell 1.Perhaps the gas of discharging from one-level relief opening 3-7 does not enter in the closed shell 1, but be introduced directly into secondary intakeport 3-8, through secondary work chamber 3-1-6 compress once more boost after, be discharged in the closed shell 1, be discharged to duplex matter system by the outlet pipe on the closed shell 1.
As shown in Figure 5, two slide plate positions are-158 ° in the cylinder, and compressor cooling working medium adopts CO2, and rolling piston whenever revolves with main shaft and turns around, and an exhaust is respectively finished in a secondary work chamber, and its concrete working procedure is as follows:
Rolling piston 3-4 in cylinder 3-1 0 ~ 90 ° when rotating, one-level active chamber 3-1-5 is converted into compression chamber by air aspiration cavity when piston 3-4 turns over one-level intakeport 3-6 position; The one-level compression chamber reduces gradually, and the one-level air aspiration cavity increases gradually.Secondary work chamber 3-1-6 is an air aspiration cavity, increases gradually.
Rolling piston is 3-4 in cylinder 3-1 90 ~ 202 ° when rotating, and the one-level compression chamber reduces gradually, finishes the one-level exhaust when compression chamber reaches 7MPa; The one-level air aspiration cavity increases gradually; Secondary work chamber 3-1-6 is an air aspiration cavity, reduces after increasing to maximum volume gradually.
Rolling piston 3-4 in cylinder 3-1 202 ~ 270 ° when rotating, secondary work chamber 3-1-6 is converted into compression chamber by air aspiration cavity when piston turns over secondary intakeport 3-8 position.The secondary compression chamber reduces gradually, and the secondary air aspiration cavity increases gradually.One-level active chamber 3-1-5 is an air aspiration cavity, increases gradually.
Rolling piston 3-4 in cylinder 3-1 270 ~ 360 ° when rotating, the secondary compression chamber reduces gradually, finishes the secondary exhaust when compression chamber reaches 10MPa; The secondary air aspiration cavity increases gradually.One-level active chamber 3-1-5 is an air aspiration cavity, reduces after increasing to maximum volume gradually.
As shown in Figure 6, a kind of three grades of single cylinder rolling piston compressors, be provided with the pump housing 3 that the electric element 2 be made up of stator 2-1 and rotor 2-2 and this electric element 2 drive in its closed shell 1, the pump housing 3 is by cylinder 3-1, three slide plate 3-2-1,3-2-2,3-2-3, three sliding blade springs, rolling piston 3-4, upper bearing (metal), lower bearing, three outlet valve 3-5 and to connect above-mentioned part be that the bolt of the pump housing is formed, cylinder-bore hole wall 3-1-2 upper edge cylinder-bore on cylinder 3-1 radially is provided with 3 vane slot 3-1-3,3-1-8,3-1-9, slide plate 3-2-1 is housed in the vane slot, 3-2-2,3-2-3, slide plate 3-2-1,3-2-2,3-2-3 respectively between following above-mentioned rolling piston 3-4 excircle of the effect of spring and cylinder-bore 3-1-1 selenodont space 3-1-4 be divided into three active chambers that volume is inequality successively, each active chamber is provided with the intakeport and the relief opening of this active chamber respectively near two vane slot places, intakeport and relief opening are successively along the setting of rolling piston sense of rotation, angle between each slide plate is inequality, one-level active chamber 3-1-5 is bigger than secondary work chamber 3-1-6 swept volume, secondary work chamber 3-1-6 is bigger than three level work volume 3-1-7, gas from compressor suck after one-level active chamber 3-1-5 compression and discharge by relief opening after, enter secondary work chamber 3-1-6 successively, after three level work chamber 3-1-7 compression, be expelled to external system by compressor at last.
Claims (6)
1. the rolling piston compressor of a single-cylinder multistage gas compression, comprise the electric element formed by stator and rotor in the closed shell and the pump housing of this electric element driving, be provided with a rolling piston that drives by the bent axle that connects rotor in the pump housing, only be provided with a cylinder in the pump housing, cylinder-bore radially is provided with two above vane slots in the cylinder-bore hole wall upper edge of cylinder, slide plate all is housed in each vane slot, slide plate selenodont space segmentation between following rolling piston excircle of the effect of spring and cylinder-bore is two above multistage operating chambeies, it is characterized in that, angle between the slide plate is unequal, the previous stage active chamber is bigger than back one-level working chamber volume successively, each active chamber is provided with the intakeport and the relief opening of this active chamber respectively near two vane slot places, intakeport and relief opening are provided with along the rolling piston sense of rotation successively, after gas sucks from compressor, after beginning compression and discharge from the one-level active chamber by this active chamber relief opening, enter level work chamber, back successively, after the compression of multistage operating chamber, be expelled to external pipeline system by afterbody active chamber relief opening.
2. the rolling piston compressor of single-cylinder multistage gas compression as claimed in claim 1, it is characterized in that, be provided with two vane slots in that the cylinder-bore hole wall upper edge of cylinder cylinder-bore is radially asymmetric, slide plate all is housed in each vane slot, and two slide plates selenodont space segmentation between following rolling piston excircle of the effect of spring and cylinder-bore is the one-level active chamber of big volume and the secondary work chamber of a less volume; Each active chamber is provided with the intakeport and the relief opening of this active chamber respectively near two vane slot places, intakeport and relief opening are provided with along the rolling piston sense of rotation successively, low-pressure gas sucks the compressed medium pressure gas that becomes of one-level active chamber from pipe-line system by one-level active chamber intakeport, medium pressure gas directly is drained into compressor closed shell inside from one-level active chamber exhaust port, directly suck by secondary work chamber intakeport again, after the compression of secondary work chamber, medium pressure gas becomes pressurized gas, is expelled to the pipe-line system of closed shell outside at last by secondary work chamber relief opening.
3. the rolling piston compressor of single-cylinder multistage gas compression as claimed in claim 1, it is characterized in that, be provided with two vane slots in that the cylinder-bore hole wall upper edge of cylinder cylinder-bore is radially asymmetric, slide plate all is housed in each vane slot, and two slide plates selenodont space segmentation between following rolling piston excircle of the effect of spring and cylinder-bore is the one-level active chamber of big volume and the secondary work chamber of a less volume; Each active chamber is provided with the intakeport and the relief opening of this active chamber respectively near two vane slot places, intakeport and relief opening are provided with along the rolling piston sense of rotation successively, low-pressure gas sucks the one-level active chamber from pipe-line system by one-level active chamber intakeport becomes medium pressure gas after compression, medium pressure gas directly is drained into compressor closed shell inside through one-level active chamber exhaust port, medium pressure gas is incorporated into the intakeport in secondary work chamber by a pipe on the closed shell outside closed shell, after the compression of secondary work chamber, medium pressure gas becomes pressurized gas, is expelled to the pipe-line system of closed shell outside at last by secondary work chamber relief opening.
4. the rolling piston compressor of single-cylinder multistage gas compression as claimed in claim 1, it is characterized in that, be provided with three vane slots in that the cylinder-bore hole wall upper edge of cylinder cylinder-bore is radially asymmetric, slide plate all is housed in each vane slot, slide plate selenodont space segmentation between following rolling piston excircle of the effect of spring and cylinder-bore is the one-level active chamber that three volumes reduce successively, secondary work chamber and three level work chambeies, each active chamber is provided with the intakeport and the relief opening of this active chamber respectively near two vane slot places, intakeport and relief opening are provided with along the rolling piston sense of rotation successively, after gas sucks from compressor, after beginning compression and discharge from the one-level active chamber by this active chamber relief opening, enter secondary successively, three level work chambeies, through secondary, after the compression of three level work chambeies, be expelled to external pipeline system by three level work chamber relief openings at last.
5. the rolling piston compressor of single-cylinder multistage gas compression as claimed in claim 1 is characterized in that, in the air intake passage in described multistage operating chamber Aspirating valves is installed.
6. the rolling piston compressor of single-cylinder multistage gas compression as claimed in claim 1 is characterized in that, the slide plate thickness of close previous stage active chamber intakeport is greater than the slide plate thickness near back one-level active chamber intakeport.
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| CN2009102544339A CN101709701B (en) | 2009-12-22 | 2009-12-22 | Single-cylinder multistage gas-compression rolling piston compressor |
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| CN2009102544339A CN101709701B (en) | 2009-12-22 | 2009-12-22 | Single-cylinder multistage gas-compression rolling piston compressor |
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| CN101709701B CN101709701B (en) | 2011-08-10 |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102828951A (en) * | 2011-06-13 | 2012-12-19 | 广东美芝制冷设备有限公司 | Double-slip-sheet type rotary compressor |
| CN103742410A (en) * | 2013-12-05 | 2014-04-23 | 广东美芝制冷设备有限公司 | Rotary compressor, and compression unit and air conditioner thereof |
| CN103967788A (en) * | 2013-02-05 | 2014-08-06 | 珠海格力节能环保制冷技术研究中心有限公司 | Compression assembly, compressor, air conditioner and heat pump water heater |
| CN104214100A (en) * | 2013-06-05 | 2014-12-17 | 珠海格力节能环保制冷技术研究中心有限公司 | Compressor and air conditioner with same |
| CN104373350A (en) * | 2014-10-29 | 2015-02-25 | 洛阳中方实业有限公司 | Miniature rolling piston refrigeration compressor |
| CN104675438A (en) * | 2014-01-22 | 2015-06-03 | 摩尔动力(北京)技术股份有限公司 | Radial multi-stage fluid mechanism and device comprising same |
| CN105422451A (en) * | 2015-12-08 | 2016-03-23 | 广东美芝制冷设备有限公司 | Compressing mechanism of rotary compressor and rotary compressor with compressing mechanism |
| CN105485007A (en) * | 2016-01-20 | 2016-04-13 | 西安交通大学 | Single-machine two-stage compression rotary compressor |
| CN105909498A (en) * | 2016-05-10 | 2016-08-31 | 西安汽车科技职业学院 | Two-stage stroke type rotary compressor |
| WO2017219669A1 (en) * | 2016-06-22 | 2017-12-28 | 珠海格力节能环保制冷技术研究中心有限公司 | Pump assembly and compressor comprising same |
| CN109185138A (en) * | 2018-10-24 | 2019-01-11 | 丹东恩威化工机械有限公司 | Magnetic force smooth type compressor |
| CN110410321A (en) * | 2019-07-31 | 2019-11-05 | 桂林航天工业学院 | A kind of rotary pressure matcher |
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2009
- 2009-12-22 CN CN2009102544339A patent/CN101709701B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102828951B (en) * | 2011-06-13 | 2014-12-31 | 广东美芝制冷设备有限公司 | Double-slip-sheet type rotary compressor |
| CN102828951A (en) * | 2011-06-13 | 2012-12-19 | 广东美芝制冷设备有限公司 | Double-slip-sheet type rotary compressor |
| CN103967788A (en) * | 2013-02-05 | 2014-08-06 | 珠海格力节能环保制冷技术研究中心有限公司 | Compression assembly, compressor, air conditioner and heat pump water heater |
| CN104214100B (en) * | 2013-06-05 | 2018-08-07 | 珠海格力节能环保制冷技术研究中心有限公司 | Compressor and air conditioner with it |
| CN104214100A (en) * | 2013-06-05 | 2014-12-17 | 珠海格力节能环保制冷技术研究中心有限公司 | Compressor and air conditioner with same |
| CN103742410A (en) * | 2013-12-05 | 2014-04-23 | 广东美芝制冷设备有限公司 | Rotary compressor, and compression unit and air conditioner thereof |
| CN103742410B (en) * | 2013-12-05 | 2015-11-18 | 广东美芝制冷设备有限公司 | Rotary compressor and compression set, air conditioner |
| CN104675438A (en) * | 2014-01-22 | 2015-06-03 | 摩尔动力(北京)技术股份有限公司 | Radial multi-stage fluid mechanism and device comprising same |
| CN104373350A (en) * | 2014-10-29 | 2015-02-25 | 洛阳中方实业有限公司 | Miniature rolling piston refrigeration compressor |
| CN105422451A (en) * | 2015-12-08 | 2016-03-23 | 广东美芝制冷设备有限公司 | Compressing mechanism of rotary compressor and rotary compressor with compressing mechanism |
| CN105422451B (en) * | 2015-12-08 | 2017-11-17 | 广东美芝制冷设备有限公司 | The compression mechanism of rotary compressor and there is its rotary compressor |
| CN105485007B (en) * | 2016-01-20 | 2017-12-08 | 西安交通大学 | The rotary compressor of unit two-stage compression |
| CN105485007A (en) * | 2016-01-20 | 2016-04-13 | 西安交通大学 | Single-machine two-stage compression rotary compressor |
| CN105909498A (en) * | 2016-05-10 | 2016-08-31 | 西安汽车科技职业学院 | Two-stage stroke type rotary compressor |
| CN105909498B (en) * | 2016-05-10 | 2017-12-22 | 西安汽车科技职业学院 | Two level stroke type rotary compressor |
| WO2017219669A1 (en) * | 2016-06-22 | 2017-12-28 | 珠海格力节能环保制冷技术研究中心有限公司 | Pump assembly and compressor comprising same |
| CN109185138A (en) * | 2018-10-24 | 2019-01-11 | 丹东恩威化工机械有限公司 | Magnetic force smooth type compressor |
| CN110410321A (en) * | 2019-07-31 | 2019-11-05 | 桂林航天工业学院 | A kind of rotary pressure matcher |
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| CN101709701B (en) | 2011-08-10 |
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