CN109267990A - A kind of downhole flow metering device - Google Patents
A kind of downhole flow metering device Download PDFInfo
- Publication number
- CN109267990A CN109267990A CN201710579310.7A CN201710579310A CN109267990A CN 109267990 A CN109267990 A CN 109267990A CN 201710579310 A CN201710579310 A CN 201710579310A CN 109267990 A CN109267990 A CN 109267990A
- Authority
- CN
- China
- Prior art keywords
- seat
- pipe
- honour
- sampling pipe
- bellows
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005259 measurement Methods 0.000 claims abstract description 32
- 238000005070 sampling Methods 0.000 claims abstract description 32
- 238000012360 testing method Methods 0.000 claims abstract description 22
- 239000002184 metal Substances 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 claims description 10
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims 1
- 239000010931 gold Substances 0.000 claims 1
- 229910052737 gold Inorganic materials 0.000 claims 1
- 238000002347 injection Methods 0.000 abstract description 9
- 239000007924 injection Substances 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 5
- 238000012856 packing Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 3
- 239000011888 foil Substances 0.000 description 2
- 210000002445 nipple Anatomy 0.000 description 2
- 241000233855 Orchidaceae Species 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 235000020681 well water Nutrition 0.000 description 1
- 239000002349 well water Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention discloses a kind of downhole flows to measure device, including measurement pipe, orifice plate, differential pressure pick-up, the orifice plate is horizontal among measurement pipe, the center flow channels of measurement pipe are separated into epicoele and cavity of resorption, the differential pressure pick-up upper end is connected to epicoele by up-sampling pipe, and lower end is connected to cavity of resorption by down-sampling pipe.The measurement pipe opens up the upper radial hole being connected to epicoele, connection up-sampling pipe, and the measurement pipe opens up the lower radial hole being connected to cavity of resorption, is connected to down-sampling pipe.A test bench is also set up between the up-sampling pipe and down-sampling pipe, the test bench is divided into the seat of honour, lower seat, ripple protection of pipe component is additionally provided between the seat of honour of the test bench and lower seat；Unidirectional valve protection assembly is additionally provided between the seat of honour of the test bench and lower seat.The present invention is small in size, can be installed in injection allocation apparatus, is used for a long time in underground, realizes annular space flow measurement.
Description
Technical field
The present invention relates to fluid flux measurement technology, specifically a kind of downhole flow measures device.
Background technique
When separate water injection well progress laminated distributor under well water injection rate monitors automatically, flowmeter need to be mounted in injection allocation apparatus, with
Injection allocation apparatus is used for a long time in underground, realizes downhole flow measurement, and flow is in respect of easy miniaturization, structure is simple, without motion portion
The basic demands such as part, reliable and stable.It can be used to the flow of realization flow measurement on the ground at present in respect of as many as tens kinds, but big
Be not suitable for being used for a long time in underground, on the one hand due to the environmental difference (temperature, pressure) on ground and underground, on the other hand at present more
The volume of flowmeter, mounting means can not be directly mounted in injection allocation apparatus, injection allocation apparatus inner space position is limited, flow
The diameter for measuring buret need to be less than 30mm, and existing flowmeter is unable to satisfy requirement.
By retrieval, application number: 201610445242.0, publication date 2016-10-26 disclose a kind of differential pressure type flow
Meter, including connecting tube, straight pipe, sensor, two packing circles and two pressure pipes, two connecting tubes are by being bolted into one
Body, the connecting tube other end is logical to be connect with straight pipe, and packing circle is provided on the end face of two connecting tubes, and the setting of orifice plate plate body exists
Between two packing circles, it is provided with multiple nozzles on orifice plate plate body, is provided with the air flue being connected to inside connecting tube in packing circle side,
Pressure pipe one end is connected to air flue, and the pressure pipe other end is connected to sensor, is provided with and is connected on packing circle other side inner wall
The dashpot being connected to inside pipe, nozzle flow to the diminution section, flat segments and the internal diameter that successively decrease along fluid by sequentially connected internal diameter
The expanding reach incremental along fluid flow direction is constituted.Flange is all made of between connecting tube and connecting tube, between connecting tube and straight pipe
Connection.
Technology disclosed above does not have the function of protection sensor.
Summary of the invention
The purpose of the present invention is to provide a kind of downhole flows to measure device, small in size, can be installed in injection allocation apparatus,
It is used for a long time in underground, realizes annular space flow measurement；Devise unidirectional valve protection assembly and ripple protection of pipe component.It is described unidirectional
Valve protection assembly can prevent prolonged High Pressure Difference from damaging to sensor.The ripple protection of pipe component, can be rapid
The biggish pulse of compensator or trimmer pressure is made, prevents spike pressure pulse from damaging, absorbs quick spike pressure pulse.
In order to achieve the above objectives, present invention employs following technical solution, a kind of downhole flow metering devices, including survey
Buret, orifice plate, differential pressure pick-up, the orifice plate is horizontal among measurement pipe, the center flow channels of measurement pipe be separated into epicoele and
Cavity of resorption, the differential pressure pick-up upper end are connected to epicoele by up-sampling pipe, and lower end is connected to cavity of resorption by down-sampling pipe, described
Also set up a test bench between up-sampling pipe and down-sampling pipe, the test bench is divided into the seat of honour, lower seat, the test bench it is upper
Ripple protection of pipe component is additionally provided between seat and lower seat；Check valve guarantor is additionally provided between the seat of honour of the test bench and lower seat
Protecting assembly.
The measurement pipe opens up the upper radial hole being connected to epicoele, and connection up-sampling pipe, the measurement pipe opens up and cavity of resorption
The lower radial hole of connection is connected to down-sampling pipe.
The seat of honour and lower seat are attached integrally by the connecting column of side, under seat of honour upper end connection up-sampling pipe
End, lower seat lower end connect down-sampling pipe upper end.
The differential pressure pick-up is located between the seat of honour of test bench and lower seat.
The ripple protection of pipe component includes corrugated header, sheet metal, bellows pillar；The corrugated header lower end connection
Sheet metal, corrugated header are connected through a screw thread with bellows pillar, and sheet metal is protected in inside bellows pillar, corrugated header
Upper end connects the seat of honour by connector, and bellows pillar lower end connects lower seat by connector.
The ripple pipe assembly includes sheet metal, bellows, thrust spring, and reasoning spring is cased with outside the bellows,
The axial ends of the bellows and thrust spring is all connected with sheet metal.
The unidirectional valve protection assembly includes that one-way valve seat, check valve core print seat, inner elements of check valve, spring, check valve connect
Head；Sequentially be set with spring, check valve core print seat outside the inner elements of check valve, check valve core print seat both ends pass through respectively screw thread with
One-way valve seat, the connection of unidirectional valve union.
Compared to the prior art, the invention has the following advantages:
The present invention can be installed in injection allocation apparatus, be used for a long time in underground, realized annular space flow measurement, have volume
Feature small, structure is simple, easy to install and use, reliable and stable.
The present invention can be made into minimizing, and small-sized orifice flowmeter includes throttling set and differential pressure pick-up.Due to matching
Dispensing device inner space position is limited, and throttling set has carried out Miniaturization Design, cancels standard orifice flow meter orchid and clamps orifice plate
Structure type, by measurement pipe be divide into upper part and lower part installation composition, junction be arranged abacus, the volume of throttling set is significantly
Reduce.Differential pressure pick-up is small in size, and flow measurement channel difference pressuring loss is small, and measurement accuracy is high, high temperature resistant, high pressure.
The present invention be guarantee flowmeter underground be used for a long time, it is reliable and stable, devise unidirectional valve protection assembly and ripple
Protection of pipe component.The unidirectional valve protection assembly, can prevent prolonged High Pressure Difference from damaging to sensor.The ripple
Protection of pipe component can make rapidly the biggish pulse of compensator or trimmer pressure, prevent spike pressure pulse from damaging, absorb quick spike
Pressure pulse.
Detailed description of the invention
Fig. 1 is that a kind of downhole flow of the present invention measures apparatus structure schematic diagram；
Fig. 2 is Fig. 1 top view；
Fig. 3 is that downhole flow measures structural schematic diagram of the device in distributor；
Fig. 4 is the structural schematic diagram of small-sized orifice flowmeter；
Fig. 5 is the structural schematic diagram of ripple protection of pipe component；
Fig. 6 is the structural schematic diagram of unidirectional valve protection assembly；
Fig. 7 is bellows assembly structure chart.
In figure: 1- measurement pipe；2- sampling pipe；3- test bench；4- ripple protection of pipe component；The unidirectional valve protection assembly of 5-；6-
Orifice plate；7- differential pressure pick-up；8- distributor；9- corrugated header；10- ripple pipe assembly；11- bellows pillar；12- one-way valve
Seat；13- check valve core print seat；14- inner elements of check valve；15- spring；The unidirectional valve union of 16-；17- sheet metal；18- bellows；19-
Thrust spring.
Specific embodiment
Detailed description for the present invention and technology contents, cooperation Detailed description of the invention it is as follows, however attached drawing only provides reference with
Purposes of discussion is not intended to limit the present invention.
According to Fig. 1, Fig. 2, Fig. 3, Fig. 5, Fig. 6, Fig. 7, a kind of downhole flow measures device, including measurement pipe 1, orifice plate 6, poor
Pressure sensor 7, the orifice plate is horizontal among measurement pipe, and the center flow channels of measurement pipe are separated into epicoele and cavity of resorption, the difference
Pressure sensor upper end is connected to epicoele by up-sampling pipe, and lower end is connected to cavity of resorption by down-sampling pipe.The measurement pipe opens up
The upper radial hole being connected to epicoele, connection up-sampling pipe, the measurement pipe open up the lower radial hole being connected to cavity of resorption, adopt under connection
Sample pipe.A test bench 3 is also set up between the up-sampling pipe and down-sampling pipe, the test bench is divided into the seat of honour, lower seat, the seat of honour
It is attached integrally with lower seat by the connecting column of side, seat of honour upper end connection up-sampling pipe lower end, under the connection of lower seat lower end
Sampling pipe upper end.The differential pressure pick-up is located between the seat of honour of test bench and lower seat.
Ripple protection of pipe component 4, the ripple protection of pipe component 4 are additionally provided between the seat of honour of the test bench and lower seat
Including corrugated header 9, ripple pipe assembly 10, bellows pillar 11.Bellows assembly 10, wave are set with outside the corrugated header 9
Line tube socket 9 is connected through a screw thread with bellows pillar 11.
Ripple pipe assembly is shown in Fig. 7, and water cannot be crossed up and down by not being connected to, generally one travelling piston, and inside is mainly by both ends
Soft foil metal 17, bellows 18, thrust spring 19 form, and just when dress, thrust spring is in compressive state, and bellows is in initial
State, when pressure oscillation occurs in one end, pushed at high pressure soft foil metal is to the mobile compression thrust spring of low-pressure end and bellows, out
Existing compensator or trimmer pressure chamber, reduces unidirectional valve protection assembly both ends pressure difference, and after pressure at two ends balance, thrust spring is by compressed wave
Line pipe is pushed into original state, is worked repeatedly, it can be achieved that buffering to high pressure spike pressure, protection differential pressure pickup prevent height
Pressure impact.
Unidirectional valve protection assembly 5 shares 2, is installed using parallel way opposite direction, unidirectional valve protection group shown in Fig. 6
Part, water (flow) direction are to circulate from bottom to top, when push it is high, on force down when, differential pressure action is on inner elements of check valve 14, Impact direction
Upwards, when the thrust that pressure difference generates is greater than 15 thrust of compressed spring, inner elements of check valve 14 is moved up, with 13 upper end of check valve core print seat
The conical surface no longer seals, to realize release of the pressure from high-voltage end to low-pressure end, achievees the purpose that protect differential pressure pick-up.Simultaneously
Another Zhi Danxiang valve protection assembly 5 in parallel due to contrary, when upper pressure height, under force down when, working principle is consistent with the above,
Play the purpose of reverse protection differential pressure pick-up.
Unidirectional valve protection assembly 5, the unidirectional valve protection assembly 5 are additionally provided between the seat of honour of the test bench and lower seat
Including one-way valve seat 12, check valve core print seat 13, inner elements of check valve 14, spring 15, unidirectional valve union 16.The inner elements of check valve
Sequentially be set with spring 15, check valve core print seat 13 outside 14,13 both ends of check valve core print seat pass through respectively screw thread and one-way valve seat 12,
Unidirectional valve union 16 connects.
Downhole flow metering device is installed in the annular space of distributor 8, and 1 diameter of flow measurement buret is less than 30mm.Measurement
Pipe 1 is welded by upper and lower two parts, and abacus 6 is arranged in weld, and there are sampling pipe 2 and 1 phase of measurement pipe in the two sides of orifice plate 6 respectively
Even.Ripple protection of pipe component 4, unidirectional valve protection assembly 5 and differential pressure pick-up 7 are bolted respectively on test bench 3, group
At flow rate test pipe nipple.
The unidirectional valve protection assembly of 2 both forward and reverse directions, 1 ripple protection of pipe component are attached group by the way of in parallel
Dress, unidirectional valve protection assembly are primarily implemented in the differential pressure security of both forward and reverse directions pressure difference 0.2MPa peak value, ripple protection of pipe component master
Realize that the peak value to shield is in different size, mainly by bullet in the differential pressure security of both forward and reverse directions pressure difference 0.6MPa peak value
Spring force size, bellows anti-pressure ability determine, are set according to actual needs to spring specification, bellows wave mode texture
Meter.When pressure difference, which is greater than 0.2MPa, is less than 0.6MPa, only unidirectional valve protection component operation, carries out pressure release, and protection differential pressure passes
Sensor；When pressure difference is greater than 0.6MPa, unidirectional valve protection assembly is pushed to dead-centre position and stops working, not after water pressure release, wave
Line protection of pipe component is started to work, and pressure buffer chamber is formed, and unilateral pressure cavity product will be increased under differential pressure action, peak value high pressure
It is reduced to low pressure, so that unidirectional valve protection assembly both ends pressure difference be made to be down within 0.6MPa, unidirectional valve protection assembly leaves dead point position
It sets and restarts work.
Unidirectional valve protection assembly is alleviated prolonged High Pressure Difference using spring and is damaged to sensor；Ripple protection of pipe group
Part uses the biggish pulse of Low rigidity sheet metal compensator or trimmer pressure, prevents spike pressure pulse from damaging.Check valve and bellows are mutually auxiliary
Sensor can be effectively protected by, which coordinating, is not damaged.Flow rate test pipe nipple is connected by bolt with two sampling pipes 2, is surveyed in real time
Measure the flow of fluid in buret 1.
The foregoing is merely presently preferred embodiments of the present invention, non-to limit the scope of the patents of the invention, other are with this
The equivalence changes of the patent spirit of invention should all belong to the scope of the patents of the invention.
Claims (7)
1. a kind of downhole flow metering device, including measurement pipe, orifice plate, differential pressure pick-up, the orifice plate are horizontal in measurement pipe
Between, the center flow channels of measurement pipe are separated into epicoele and cavity of resorption, which is characterized in that the differential pressure pick-up upper end passes through up-sampling
Pipe is connected to epicoele, and lower end is connected to cavity of resorption by down-sampling pipe, also sets up one between the up-sampling pipe and down-sampling pipe
Test bench, the test bench are divided into the seat of honour, lower seat, ripple protection of pipe group are additionally provided between the seat of honour of the test bench and lower seat
Part；Unidirectional valve protection assembly is additionally provided between the seat of honour of the test bench and lower seat.
2. a kind of downhole flow according to claim 1 measures device, which is characterized in that the measurement pipe opens up and epicoele
The upper radial hole of connection, connection up-sampling pipe, the measurement pipe open up the lower radial hole being connected to cavity of resorption, are connected to down-sampling pipe.
3. a kind of downhole flow according to claim 1 measures device, which is characterized in that the seat of honour and lower seat pass through side
The connecting column of side is attached integrally, and seat of honour upper end connection up-sampling pipe lower end, lower seat lower end connects down-sampling pipe upper end.
4. a kind of downhole flow according to claim 1 measures device, which is characterized in that the differential pressure pick-up, which is located at, to be surveyed
Between the seat of honour and lower seat for trying seat.
5. a kind of downhole flow according to claim 3 measures device, which is characterized in that the ripple protection of pipe component packet
Include corrugated header, ripple pipe assembly, bellows pillar；The corrugated header lower end connects ripple pipe assembly, corrugated header and wave
Line is managed and protected pipe and is connected through a screw thread, and ripple pipe assembly is protected in inside bellows pillar, and corrugated header upper end is connected by connector
Seat is connected, bellows pillar lower end connects lower seat by connector.
6. a kind of downhole flow according to claim 5 measures device, which is characterized in that the ripple pipe assembly includes gold
Belong to piece, bellows, thrust spring, reasoning spring, the axial direction two of the bellows and thrust spring are cased with outside the bellows
End is all connected with sheet metal.
7. a kind of downhole flow according to claim 3 measures device, which is characterized in that the unidirectional valve protection assembly packet
Include one-way valve seat, check valve core print seat, inner elements of check valve, spring, unidirectional valve union；It is sequentially set with outside the inner elements of check valve
Spring, check valve core print seat, check valve core print seat both ends pass through screw thread respectively and connect with one-way valve seat, unidirectional valve union.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710579310.7A CN109267990A (en) | 2017-07-17 | 2017-07-17 | A kind of downhole flow metering device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710579310.7A CN109267990A (en) | 2017-07-17 | 2017-07-17 | A kind of downhole flow metering device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109267990A true CN109267990A (en) | 2019-01-25 |
Family
ID=65147809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710579310.7A Pending CN109267990A (en) | 2017-07-17 | 2017-07-17 | A kind of downhole flow metering device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109267990A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201277334Y (en) * | 2008-10-21 | 2009-07-22 | 大连八方经济技术有限公司 | Diaphragm type voltage-regulation fine-adjustment valve |
| WO2012048936A1 (en) * | 2010-10-12 | 2012-04-19 | Endress+Hauser Gmbh+Co.Kg | Differential pressure indicator arrangement for a flow meter and flow meter having such a differential pressure indicator arrangement |
| CN102620776A (en) * | 2012-04-23 | 2012-08-01 | 王可崇 | Built-in middle through hole dynamic throttling element flowmeter |
| CN104358560A (en) * | 2014-11-12 | 2015-02-18 | 中国石油天然气股份有限公司 | Take downhole flow testing arrangement of protection machanism |
| CN204312051U (en) * | 2014-11-12 | 2015-05-06 | 中国石油天然气股份有限公司 | Take downhole flow testing arrangement of protection machanism |
| CN105952435A (en) * | 2016-04-26 | 2016-09-21 | 哈尔滨工业大学 | Vortex shedding flow-meter suitable for oil-water well underground |
-
2017
- 2017-07-17 CN CN201710579310.7A patent/CN109267990A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201277334Y (en) * | 2008-10-21 | 2009-07-22 | 大连八方经济技术有限公司 | Diaphragm type voltage-regulation fine-adjustment valve |
| WO2012048936A1 (en) * | 2010-10-12 | 2012-04-19 | Endress+Hauser Gmbh+Co.Kg | Differential pressure indicator arrangement for a flow meter and flow meter having such a differential pressure indicator arrangement |
| CN102620776A (en) * | 2012-04-23 | 2012-08-01 | 王可崇 | Built-in middle through hole dynamic throttling element flowmeter |
| CN104358560A (en) * | 2014-11-12 | 2015-02-18 | 中国石油天然气股份有限公司 | Take downhole flow testing arrangement of protection machanism |
| CN204312051U (en) * | 2014-11-12 | 2015-05-06 | 中国石油天然气股份有限公司 | Take downhole flow testing arrangement of protection machanism |
| CN105952435A (en) * | 2016-04-26 | 2016-09-21 | 哈尔滨工业大学 | Vortex shedding flow-meter suitable for oil-water well underground |
Non-Patent Citations (4)
| Title |
|---|
| 孙金峰等: "免投捞实时测控精细注水技术", 《石油机械》 * |
| 杨潭等: "《仪器仪表零件及机构》", 31 December 1989, 哈尔滨船舶工程学院出版社 * |
| 白明垠等: "KLB-98智能化双波纹管流量计", 《油田地面工程》 * |
| 黄斌等: "差压式流量计的应用与分析", 《自动化仪表》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114635817A (en) | Pressure fluctuation suppression device based on two-stage piston spring system | |
| CN103195154A (en) | Novel pressurizing flow-increasing water storage device and flushing system | |
| CN102278330B (en) | Hydraulic device | |
| CN110608208A (en) | Buffering formula energy storage ware | |
| CN101846537B (en) | Small liquid volume gas-liquid two-phase flowmeter | |
| CN108425821A (en) | A kind of hydraulic booster pump | |
| CN109267990A (en) | A kind of downhole flow metering device | |
| CN204327607U (en) | A kind of piston accumulator | |
| CN103851028B (en) | Large-scale blast wave simulator buffering recuperator means | |
| CN102979481B (en) | Anti-blocking constant pressure switch of water injection pipe column | |
| CN207975065U (en) | A kind of axial direction hydrostatic support buffering hydraulic cylinder | |
| CN106594448A (en) | Broadband gas-liquid two-phase spring pulsation damper | |
| CN206816871U (en) | It is a kind of to pass through the valve of pressure change liquid outlet channel | |
| CN105782137B (en) | A kind of super-pressure accumulator | |
| CN108105310A (en) | Two section of one kind or more piece piston rod type nitrogen gas spring | |
| CN106764222B (en) | Shell and tube fluid flow straightener | |
| CN106678102A (en) | Deflecting plate jet flow electro-hydraulic servo valve based on piezoelectric structure | |
| CN105805059B (en) | A kind of dual Piston accumulator | |
| CN202017604U (en) | High-efficiency oil well pump | |
| CN210599611U (en) | Miniature closed pressure oil tank | |
| CN213270523U (en) | Hydraulic limiting type multi-stage oil cylinder | |
| CN102562908B (en) | Bidirectional hydraulic buffer | |
| CN208966564U (en) | Infusion pump in parallel integrated form linker | |
| CN1063746A (en) | Flow through piston accumulator | |
| CN208565128U (en) | Elevating ram |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190125 |