CN201183035Y - Injection device for low-pressure natural gas production and transportation - Google Patents
Injection device for low-pressure natural gas production and transportation Download PDFInfo
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- CN201183035Y CN201183035Y CNU2008200801391U CN200820080139U CN201183035Y CN 201183035 Y CN201183035 Y CN 201183035Y CN U2008200801391 U CNU2008200801391 U CN U2008200801391U CN 200820080139 U CN200820080139 U CN 200820080139U CN 201183035 Y CN201183035 Y CN 201183035Y
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 154
- 239000003345 natural gas Substances 0.000 title claims abstract description 77
- 238000002347 injection Methods 0.000 title claims abstract description 21
- 239000007924 injection Substances 0.000 title claims abstract description 21
- 239000007789 gas Substances 0.000 claims abstract description 83
- 238000002156 mixing Methods 0.000 claims abstract description 36
- 230000009467 reduction Effects 0.000 claims description 7
- 230000008676 import Effects 0.000 claims description 4
- 238000000605 extraction Methods 0.000 abstract description 11
- 238000005516 engineering process Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 239000012530 fluid Substances 0.000 description 17
- 239000007787 solid Substances 0.000 description 11
- 239000000203 mixture Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 239000000654 additive Substances 0.000 description 5
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- 238000009826 distribution Methods 0.000 description 5
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- 239000000126 substance Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 150000004677 hydrates Chemical class 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000008246 gaseous mixture Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
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- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Abstract
A low-pressure natural gas extraction and transportation injection device is applied to the technical field of natural gas extraction and transportation. Is characterized in that: an air duct is fixed between the high-pressure natural gas inlet end of the three-way shell and the connecting pipe. One end of the air duct is arranged in the high-pressure natural gas inlet end of the three-way shell. A main gas nozzle is arranged in the high-pressure natural gas inlet end of the three-way shell. The end of the air duct is pressed and fixed with the main air nozzle. A mixing cavity and a diffuser are fixed between the natural gas outlet end flange of the three-way shell and the connecting pipe. One end of the mixing cavity is arranged in the natural gas outlet end of the three-way shell and is opposite to the main gas nozzle. The outer wall of the outlet of the main gas nozzle and the inner wall surface of the inlet of the mixing cavity form an annular channel for low-pressure natural gas inlet. The effect is as follows: the high-efficiency collection and transportation of the low-pressure natural gas are realized by utilizing the injection technology, and after the gas passes through the injector, the speed and the temperature of the high-pressure gas and the low-pressure gas are uniform, so that the stability of the pressure of a conveying pipe network is facilitated.
Description
Technical field
The utility model relates to natural gas extraction and conveying technology field, is a kind of low pressure natural gas exploitation and the injection apparatus of carrying.
Background technology
The natural gas extraction and the effect in the national economic development of carrying hold the balance, for people's life, industrial production provide clean energy resource and raw material.
At present, in natural gas extraction and course of conveying, adopt pipeline to carry.When well head gas pressure during less than discharge pressure, need to adopt compressor carry out after the supercharging could input channel in; On the other hand, the high-pressure energy of the high-pressure natural gas that a lot of high-pressure wells produce is wasted on the choke valve, need consume extra energy and drive natural gas compressor.In addition, the pressure of natural gas air accumulator descends with the minimizing of gas-storing capacity, and air feed can not be incorporated into the power networks when the pressure of air accumulator is lower than certain value.At this moment, need take high-pressure natural gas fluidics to collect the air accumulator spirit air feed that is incorporated into the power networks equally.
The high-pressure injection technology is utilized the energy injection low-pressure fluid of high-pressure fluid, is used widely in industry.Though the spraying technique of single phase gas is mature on the whole, but can not be directly used in natural gas extraction and transportation, its reason mainly contains two, one, natural gas is the complex mixture that comprises water vapour and multiple hydrocarbon, in expansion process, can form gas hydrates, block flow channel; Its two, the diffuser of injection apparatus is easy to generate boundary layer separation, formed secondary stream reduces the efficient of device.
The similar technology retrieval relevant with the utility model:
1, Chinese patent notification number: CN1030881 provides " a kind of injection apparatus that is provided with an additive fluid dispenser in the port of export ".Include: a jet pipe is provided with a fluid arrival end and a fluid port of export; Jockey is connected to a main fluid source in order to the fluid arrival end with jet pipe, and an additive fluid dispenser be provided with a cavity with keep additive fluid and be connected to the fluid outlet that prolongs jet pipe with main fluid of the jet pipe of flowing through and his like to forming coaxial consistent relation.This injection apparatus has the additive fluid dispenser that keeps cavity that additive fluid uses and hybrid chamber and is the fluid outlet that is connected to jet pipe and becomes concord with the flow direction of the main fluid of the jet pipe of flowing through, to open valve body.This injection apparatus can not be directly used in natural gas extraction and transportation.
2, Chinese patent notification number: 1562499, a kind of " strength conveying gas-solid injector " is provided.Form by gas nozzle, receiving chamber and mixing tube, gas nozzle is located in the receiving chamber and gas nozzle and receiving chamber are positioned on the same axis, mixing tube is located at the exit of receiving chamber, in receiving chamber, be provided with material blanking tube, the inner chamber of receiving chamber is connected to form by Venturi tube-type spreader inner chamber and convergence type frustum of a cone cavity, material blanking tube is positioned on the Venturi tube-type spreader inner chamber, and gas nozzle is positioned on the converging portion of Venturi tube-type spreader inner chamber.Because receiving chamber of the present utility model inner chamber is the type of a diffusion back convergence earlier structure, the idle space and the material lagging zone of having eliminated existing gas-solid injector have significantly reduced the energy loss that Dual-Phrase Distribution of Gas olid causes in the receiving chamber front portion.Help Dual-Phrase Distribution of Gas olid and in receiving chamber, mix and the energy transmission, make the mixing of Dual-Phrase Distribution of Gas olid and the transmission overwhelming majority of energy in receiving chamber, finish, reduced the mixing of Dual-Phrase Distribution of Gas olid in mixing tube and the share of energy exchange.This patent is used for the conveying solid substance material, can not be used for natural gas extraction and transportation.
3, " combustion science and technology " magazine, P.130-134 2004 Vol.10 No.2 deliver the article of bear source, Zhang Mingyao, " experimental study of pressurization gas-solid injector conveying characteristic ".On supercharging air-transport system experimental rig, key factor to the operating characteristic that influences the shrinkage type gas-solid injector has been done more detailed research. and experimental study is the result show, the angle of throat of gas nozzle position and contraction section all has bigger influence to the maximum Solid Conveying and Melting amount of gas-solid injector. and in addition, the angle of throat of gas nozzle position and contraction section also all has certain influence to the static pressure distribution in the shrinkage type gas-solid injector.
The gas-solid injector that the document is studied is to utilize the kinetic energy of high velocity air to carry a kind of feeding device of powder body.This device mainly by hopper, nozzle, receiving chamber, mixer (trunnion), protect loose section and pneumatic carrier road and formed.
Gas-solid injector is used for the conveying solid substance material, can not be used for natural gas extraction and transportation.
4, EJT serial large-scale adjustable gas injector is a kind of decarburization injector, utilizes calm the anger body and steam as power gas, and draws low pressure fluid (gas) improves its outlet pressure and temperature.This device is made up of gas ejector and adjusting device.The pressure working gas sucks low-pressure fluid by injector, and steam and gas fluid-mixing are discharged by pump discharge.When customer charge changes, change the actual flow section area of nozzle by the aperture of regulating nozzle needle, import and export flow thereby regulate, to satisfy user's different load needs.
This device is mainly used in big-and-middle-sized chemical fertilizer factory (ammonia factory) conserve water steam, reduces the decarburization hear rate.This device is a kind of low-voltage equipment, and operating pressure 0.08MPa all can not be used for natural gas extraction and transportation on pressure rating and function.
The utility model content
The purpose of this utility model is: provide a kind of low pressure natural gas that is used for simple in structure, movement-less part to adopt defeated injection apparatus.Utilize high-pressure well prevention of natural gas ejected low pressure well natural gas to realize the natural gas high-efficiency mining.
The technical solution adopted in the utility model is: the utility model is used for low pressure natural gas and adopts defeated injection apparatus and comprise a composition such as three-way body, wireway, main gas nozzle, mixing chamber, diffuser, swirl vane and pipe fitting, flange and bolt.High-pressure natural gas inlet end, high-pressure natural gas outlet side and low pressure gas entrance point are arranged on three-way body.Inlet end and outlet side point-blank, the low pressure gas entrance point is vertical with the outlet side with inlet end.
On the high-pressure natural gas inlet end flange of three-way body, adopt screw bolt and nut to be fixed with tube connector, the other end of tube connector is fixed with bump joint.Between the high-pressure natural gas inlet end of three-way body and tube connector, be fixed with wireway.One end of wireway is in the high-pressure natural gas inlet end of three-way body.A main gas nozzle is arranged in the high-pressure natural gas inlet end of three-way body.The end of wireway compresses and fixing main gas nozzle.
On the flange of the natural gas outlet side of three-way body, adopt screw bolt and nut to be fixed with tube connector, the other end of tube connector is fixed with bump joint.Between the natural gas outlet side flange of three-way body and tube connector, be fixed with mixing chamber and diffuser.One end of mixing chamber is in the natural gas outlet side of three-way body and relative with main gas nozzle.The outlet outer wall of main gas nozzle and the import internal face of mixing chamber have constituted the circular passage of low pressure natural gas air inlet.
Be fixed with bump joint at the low pressure gas entrance point.Low pressure gas entrance point center line and main gas nozzle center line are vertically opposite.
For jet power that improves main gas blowout and the ability of carrying low pressure gas, the flow area in the main burner is that the runner section of diameter reduction gradually connects equal diameter runner section, and diameter runner section connects the runner section of magnifying diameter gradually.Flow area in the mixing chamber is that the runner section of diameter reduction gradually connects equal diameter runner section, and equal diameter runner section connects the runner section of magnifying diameter gradually.The flow section of diffuser is magnifying diameter shape gradually.
In order to adjust the position of mixing chamber, on the outer wall of mixing chamber, be fixed with straight pin, the outer end of pin is connected with extension bar.
Four groups of swirl vanes are arranged on the circular passage between main gas nozzle and the mixing chamber; Swirl vane is a symmetric arrangement.
Consider that the natural gas of exploiting out from gas well contains water vapour and other high boiling components, for preventing that the natural gas mixture that is produced blocks flow channel because temperature descends in the expansion process, the utility model adopts electrical heating to make channel wall keep higher temperature.Promptly on the outer wall of low pressure gas entrance point, be fixed with electric heater.
High-pressure natural gas is by behind the main gas nozzle, expand and the generation supersonic airstream, fully mix formation high-speed mixing air-flow with the low pressure natural gas that enters through low pressure gas entrance point passage, in the variable cross-section passage, realize boosting of gaseous mixture, make the mixture pressure of high-pressure natural gas outlet side reach the requirement of conveying.Be provided with four groups of swirl vanes on the circular passage between main gas nozzle and the mixing chamber, swirl vane is to strengthen its mixed process.
The beneficial effects of the utility model: the utility model is used for low pressure natural gas and adopts defeated injection apparatus, utilizes spraying technique to realize that efficiently adopting of low pressure natural gas is defeated, compares with conventional method, and plant bulk is little, and is simple in structure, easily processing, and cost is low; Do not have moving component, be suitable for the supercharging and the conveying of explosive natural gas; Gas is by behind the injector, and high and low pressure gas velocity, temperature are even, help the stable of transmission pipeline network pressure, have broad application prospects in natural gas extraction and transportation art.
Description of drawings
Fig. 1 is that the utility model is used for low pressure natural gas and adopts defeated injection apparatus structural profile schematic diagram.Filled arrows is the direction that high-pressure natural gas flows; Hollow arrow is the direction that low pressure gas flows.
Fig. 2 is the partial cutaway schematic of Fig. 1.Position relation between expression main gas nozzle 9, swirl vane 14 and the mixing chamber 12.
Among the figure, 1. bump joint, 2. sealing gasket, 3. tube connector, 4. bolt, 5. nut, 6. wireway, 7. three-way body, 8. seal washer, 9. main gas nozzle, 10. pin, 11. extension bars, 12. mixing chambers, 13. diffusers, 14. swirl vanes.
The specific embodiment
Embodiment 1: with the internal diameter of a three-way body 7 be 50 millimeters the low pressure natural gas that is used for to adopt defeated injection apparatus be example, the utility model is described in further detail.
Consult Fig. 1.The utility model comprises a three-way body 7, wireway 6, main gas nozzle 9, mixing chamber 12, diffuser 13, swirl vane 14, electric heater and compositions such as pipe fitting, flange and bolt.High-pressure natural gas inlet end, high-pressure natural gas outlet side and low pressure gas entrance point are arranged on three-way body 7.Inlet end and outlet side point-blank, the low pressure gas entrance point is vertical with the outlet side with inlet end.Three-way body 7 internal diameters are 50 millimeters.
On the high-pressure natural gas inlet end flange of three-way body 7, adopt bolt 4 and nut to be fixed with tube connector 3, the other end of tube connector 3 is fixed with bump joint 1.Between the high-pressure natural gas inlet end of three-way body 7 and tube connector 3, be fixed with wireway 6.One end of wireway 6 is in the high-pressure natural gas inlet end of three-way body 7.A main gas nozzle 9 is arranged in the high-pressure natural gas inlet end of three-way body 7.The end of wireway 6 compresses and fixing main gas nozzle 9.The internal diameter of wireway 6 is 30 millimeters.Flow area in the main burner 9 is that the runner section of diameter reduction gradually connects equal diameter runner section, and equal diameter runner section connects the runner section of magnifying diameter gradually.The total length of main burner 9 is for being 100 millimeters; Main burner 9 maximum inner diameters are 30 millimeters, and minimum diameter is 5 millimeters, and equal diameter runner section internal diameter is 5 millimeters, and being amplified to internal diameter gradually is 6 millimeters.
On the flange of the natural gas outlet side of three-way body 7, adopt bolt 4 and nut to be fixed with tube connector 3, the other end of tube connector 3 is fixed with bump joint 1.Between the natural gas outlet side flange of three-way body 7 and tube connector 3, be fixed with mixing chamber 12 and diffuser 13.One end of mixing chamber 12 is in the natural gas outlet side of three-way body 7 and relative with main gas nozzle 9.The outlet outer wall of main gas nozzle 9 and the import internal face of mixing chamber 12 have constituted the circular passage of low pressure natural gas air inlet.Four groups of swirl vanes 14 are arranged on the circular passage between main gas nozzle 9 and the mixing chamber 12; Swirl vane 14 is a symmetric arrangement.Flow area in the mixing chamber 12 is that the runner section of diameter reduction gradually connects equal diameter runner section, and equal diameter runner section connects the runner section of magnifying diameter gradually.The runner section inwall of the diameter reduction gradually of mixing chamber 12 is a circular arc, and arc radius is 15 millimeters.The internal diameter of equal diameter runner section is 8 millimeters, and being amplified to internal diameter gradually is 12.3 millimeters.The flow area of diffuser 13 is magnifying diameter shape gradually.The flow area internal diameter of diffuser 13 is by 12.3 millimeters, and being amplified to internal diameter gradually is 20 millimeters.
Be fixed with bump joint 1 at the low pressure gas entrance point.Low pressure gas entrance point center line and main gas nozzle 9 center lines are vertically opposite.
The outer end that is fixed with 10, two pins 10 of two straight pins on the outer wall of mixing chamber 12 is connected with an extension bar 11 respectively.
High pressure gas reduces, expands through wireway 6 and main gas nozzle 9 back pressure, produces supersonic airstream and enters hybrid chamber; Low pressure gas enters hybrid chamber, produces under the effect of swirl vane 14 and rotatablely move through the formed flow channel of inwall of main gas nozzle 9 outer walls and hybrid chamber 12, two strands of air-flows mix in the throat of hybrid chamber 12, and generation mixed airflow is at a high speed finished in the flaring passage of hybrid chamber 12 and diffuser 13 and boosted.Owing to having produced under the effect of swirl vane 14, the low pressure gas that enters hybrid chamber 12 rotatablely moves, strengthened the mixed process between low pressure gas and the high pressure gas, and according to the conservation of angular momentum principle mixed airflow also being produced rotatablely moves, the rotary centrifugal force that is produced can effectively suppress boundary layer separation, has improved the efficient of diffusion process; In addition, the drop that the high pressure gas expansion process generates moves near the hybrid chamber wall under action of centrifugal force, and electric heater makes low pressure gas entrance point wall keep higher temperature, these drops can be evaporated rapidly, suppressed the generation of gas hydrates, prevent the flow channel obstruction, improved equipment dependability.
Embodiment 2: with embodiment 1 difference be: be fixed with electric heater on the outer wall of low pressure gas entrance point.Electrical heating makes the conduit wall of low pressure gas entrance point keep higher temperature, improves the temperature of air inlet.
Claims (5)
1, a kind of low pressure natural gas that is used for is adopted defeated injection apparatus, comprise a three-way body (7), wireway (6), main gas nozzle (9), mixing chamber (12), diffuser (13), swirl vane (14) and pipe fitting, flange and bolt, it is characterized in that: high-pressure natural gas inlet end, high-pressure natural gas outlet side and low pressure gas entrance point are arranged on three-way body 7, inlet end and outlet side point-blank, the low pressure gas entrance point is vertical with the outlet side with inlet end;
On the high-pressure natural gas inlet end flange of three-way body (7), adopt bolt (4) and nut to be fixed with tube connector (3), the other end of tube connector (3) is fixed with bump joint (1), between the high-pressure natural gas inlet end of three-way body (7) and tube connector (3), be fixed with wireway (6), one end of wireway (6) is in the high-pressure natural gas inlet end of three-way body (7), a main gas nozzle (9) is arranged in the high-pressure natural gas inlet end of three-way body (7), and the end of wireway (6) compresses and fixing main gas nozzle (9);
On the flange of the natural gas outlet side of three-way body (7), adopt bolt (4) and nut to be fixed with tube connector (3), the other end of tube connector (3) is fixed with bump joint (1), between the natural gas outlet side flange of three-way body (7) and tube connector (3), be fixed with mixing chamber (12) and diffuser (13), one end of mixing chamber (12) is in the natural gas outlet side of three-way body (7) and relative with main gas nozzle (9), and the import internal face of the outlet outer wall of main gas nozzle (9) and mixing chamber (12) has constituted the circular passage of low pressure natural gas air inlet;
Be fixed with bump joint (1) at the low pressure gas entrance point, low pressure gas entrance point center line and main gas nozzle (9) center line is vertically opposite.
2, the low pressure natural gas that is used for according to claim 1 is adopted defeated injection apparatus, it is characterized in that: the flow area in the described main burner (9) is that the runner section of diameter reduction gradually connects equal diameter runner section, diameter runner section connects the runner section of magnifying diameter gradually, flow area in the mixing chamber (12) is that the runner section of diameter reduction gradually connects equal diameter runner section, equal diameter runner section connects the runner section of magnifying diameter gradually, and the flow section of diffuser (13) is magnifying diameter shape gradually.
3, the low pressure natural gas that is used for according to claim 1 is adopted defeated injection apparatus, it is characterized in that: be fixed with straight pin (10) on the outer wall of mixing chamber (12), the outer end of pin (10) is connected with extension bar (11).
4, adopt defeated injection apparatus according to claim 1 or the 2 or 3 described low pressure natural gas that are used for, it is characterized in that: on the circular passage between main gas nozzle (9) and the mixing chamber (12), four groups of swirl vanes (14) are arranged; Swirl vane (14) is a symmetric arrangement.
5, adopt defeated injection apparatus according to claim 1 or the 2 or 3 described low pressure natural gas that are used for, it is characterized in that: on the outer wall of low pressure gas entrance point, be fixed with electric heater.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CNU2008200801391U CN201183035Y (en) | 2008-04-23 | 2008-04-23 | Injection device for low-pressure natural gas production and transportation |
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Application Number | Priority Date | Filing Date | Title |
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CNU2008200801391U CN201183035Y (en) | 2008-04-23 | 2008-04-23 | Injection device for low-pressure natural gas production and transportation |
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CNU2008200801391U Expired - Lifetime CN201183035Y (en) | 2008-04-23 | 2008-04-23 | Injection device for low-pressure natural gas production and transportation |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102228773A (en) * | 2011-06-02 | 2011-11-02 | 杭州溢达机电制造有限公司 | Afterheat regeneration absorbing type desiccator |
CN102310509A (en) * | 2010-07-09 | 2012-01-11 | 无锡易维模型设计制造有限公司 | Negative pressure scraping device for photosensitive curing forming machine |
CN104998523A (en) * | 2015-07-15 | 2015-10-28 | 苏州赛弗尔机械有限公司 | Preheated circulating adsorbing and drying machine |
CN106195347A (en) * | 2016-07-11 | 2016-12-07 | 常州大学 | A kind of anti-icing stifled automatic fluid injection choke valve being provided with reservoir |
CN110906167A (en) * | 2019-12-06 | 2020-03-24 | 西安石油大佳润实业有限公司 | Gathering and transferring device and method for preventing mutual influence of high-low pressure fluid grid connection |
-
2008
- 2008-04-23 CN CNU2008200801391U patent/CN201183035Y/en not_active Expired - Lifetime
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102310509A (en) * | 2010-07-09 | 2012-01-11 | 无锡易维模型设计制造有限公司 | Negative pressure scraping device for photosensitive curing forming machine |
CN102310509B (en) * | 2010-07-09 | 2015-02-25 | 无锡易维模型设计制造有限公司 | Negative pressure scraping device for photosensitive curing forming machine |
CN102228773A (en) * | 2011-06-02 | 2011-11-02 | 杭州溢达机电制造有限公司 | Afterheat regeneration absorbing type desiccator |
CN102228773B (en) * | 2011-06-02 | 2013-12-18 | 杭州溢达机电制造有限公司 | Afterheat regeneration absorbing type desiccator |
CN104998523A (en) * | 2015-07-15 | 2015-10-28 | 苏州赛弗尔机械有限公司 | Preheated circulating adsorbing and drying machine |
CN106195347A (en) * | 2016-07-11 | 2016-12-07 | 常州大学 | A kind of anti-icing stifled automatic fluid injection choke valve being provided with reservoir |
CN110906167A (en) * | 2019-12-06 | 2020-03-24 | 西安石油大佳润实业有限公司 | Gathering and transferring device and method for preventing mutual influence of high-low pressure fluid grid connection |
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Granted publication date: 20090121 |