CN110907001A - On-line continuous weighing and flow measuring device for oil field - Google Patents
On-line continuous weighing and flow measuring device for oil field Download PDFInfo
- Publication number
- CN110907001A CN110907001A CN201911084045.0A CN201911084045A CN110907001A CN 110907001 A CN110907001 A CN 110907001A CN 201911084045 A CN201911084045 A CN 201911084045A CN 110907001 A CN110907001 A CN 110907001A
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- block
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/12—Cleaning arrangements; Filters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F13/00—Apparatus for measuring by volume and delivering fluids or fluent solid materials, not provided for in the preceding groups
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G17/00—Apparatus for or methods of weighing material of special form or property
- G01G17/04—Apparatus for or methods of weighing material of special form or property for weighing fluids, e.g. gases, pastes
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Abstract
The invention discloses an online continuous weighing and flow measuring device for an oil field, which comprises a box body and four hoisting rings arranged at the top of the box body, wherein the front surface of the box body is rotatably connected with a box door through a hinge, an observation port is formed in the box door, a transparent observation mirror is arranged in the observation port, a cleaning inner strip is arranged on the inner side surface of the box door, and a cleaning sponge is arranged on the inner side surface of the cleaning inner strip; through the clean interior strip, clean sponge, base block, circular ejector pad, first spring chamber, interior piece, screw rod, the smooth mouth of bar and the cover block of supporting that sets up for operating personnel can directly promote from top to bottom through the circular ejector pad under the condition of not opening the chamber door, causes clean sponge to carry out effectual clearance to the interior side surface of transparent sight glass, has solved in the former device and has had to open the chamber door just can carry out the problem of clearing up to transparent sight glass interior side surface.
Description
Technical Field
The invention belongs to the technical field of oil field flow measurement, and particularly relates to an oil field on-line continuous weighing flow measurement device.
Background
The oil field on-line continuous weighing and metering is an important work in oil field production management, the oil well yield is accurately and timely metered, the oil reservoir condition is mastered, a production scheme is formulated, and the oil field on-line continuous weighing and metering mode has important guiding significance.
The observation port is arranged in the box door of the existing oil field online metering box, and the transparent observation mirror is embedded in the observation port, so that an operator can observe the metering meter on the inner side of the box body through the transparent observation mirror, but the inner side of the box door is not provided with any device capable of cleaning the inner side surface of the transparent observation mirror, so that when water mist, dirt and dust appear on the inner side surface of the transparent observation mirror, the operator must open the box door firstly to clean the inner side surface of the transparent observation mirror, and certain disadvantages exist.
Disclosure of Invention
The invention aims to provide an oil field online continuous weighing and flow measuring device, which aims to solve the problems that an observation port is formed in a box door of the existing oil field online metering box in the background technology, and a transparent observation mirror is embedded in the observation port, so that an operator can observe a meter on the inner side of the box body through the transparent observation mirror, but the inner side of the box door is not provided with any device capable of cleaning the inner side surface of the transparent observation mirror, so that when water mist, dirt and dust appear on the inner side surface of the transparent observation mirror, the operator must open the box door first to clean the inner side surface of the transparent observation mirror, and certain defects exist.
In order to achieve the purpose, the invention provides the following technical scheme: the oil field online continuous weighing and flow measuring device comprises a box body and four hoisting rings arranged at the top of the box body, wherein the front surface of the box body is rotatably connected with a box door through a hinge, an observation port is formed in the box door, a transparent observation mirror is arranged in the observation port, a cleaning inner strip is arranged on the inner side surface of the box door, a cleaning sponge is arranged on the inner side surface of the cleaning inner strip, the top end of the cleaning sponge is attached to the inner side surface of the transparent observation mirror, two integrated base blocks are arranged on the inner side surface of the cleaning inner strip, two circular push blocks corresponding to the base blocks are arranged on the outer side surface of the box door, a first spring chamber is arranged in the base block, an inner abutting block is connected to the end of the first spring chamber, a screw rod is fixedly welded on one side of the inner abutting block, and two strip sliding ports corresponding to the screw rod are formed in the box door, and the top end of the screw rod penetrates through the outer side of the box door, the integrated sleeve block is arranged on the inner side surface of the circular push block, and the top end of the screw rod is fixed in the sleeve block.
Preferably, the bottom of hoist and mount ring is equipped with the connection base block of integral type, and the top surface of box set up four base block grooves with being connected base block looks adaptation, the oval pull groove that two positions and base block groove phase correspond is all seted up to the front surface and the rear surface of box, and the inside of oval pull groove is provided with draws the piece, the inboard that draws the piece is equipped with the pin rod of integral type, the pole hole with pin rod looks adaptation is all seted up to the inside both sides in base block groove, and one of them pole hole communicates with each other with oval pull groove, connect the inside of base block and set up the circular through-hole with pin rod looks adaptation, and be provided with block mechanism between pin rod and the circular through-hole.
Preferably, the clamping mechanism comprises two hemispherical clamping blocks arranged on the surface of the pin rod, and the inner wall of the circular through hole is provided with two annular clamping grooves corresponding to the hemispherical clamping blocks.
Preferably, the bottom end of the hemispherical fixture block is connected with a second spring chamber, and the second spring chamber is positioned inside the pin rod.
Preferably, the top end surface of the screw rod is provided with an external thread, the inside of the sleeve block is provided with a thread groove corresponding to the top end of the screw rod, and the thread on the inner wall of the thread groove is matched with the external thread.
Preferably, the bottom of clean sponge is glued and is fixed with the base strip, and the fixed slot with base strip looks adaptation is seted up to the inboard of clean interior strip, the base strip passes through the screw fixation inside the fixed slot.
Preferably, the surface of the screw is provided with an integrated circular ring bulge, and the circular ring bulge is positioned inside the strip-shaped sliding opening.
Compared with the prior art, the invention has the beneficial effects that:
1. through the clean interior strip that sets up, clean sponge, the base block, circular ejector pad, first spring chamber, interior support the piece, the screw rod, the smooth mouth of bar and cover block for operating personnel can be under the condition of not opening the chamber door, directly through promoting from top to bottom to circular ejector pad, cause clean sponge to carry out effectual clearance to the interior side surface of transparent sight glass, solved in the primary importance must open the chamber door just can carry out the problem of clearance to transparent sight glass interior side surface, can bring conveniently for operating personnel in the in-service use process.
2. Through the connection base block that sets up, the base block groove, oval kerve, draw the piece, the pin rod, the pole hole, circular through-hole, the second spring chamber, hemisphere fixture block and ring groove, make by original thread tightening between hoisting ring and the box, the block that changes into easy dismouting is connected, make hoisting ring easily pull down when fracture and damage appear and change, and compare original more firm of thread tightening, the risk that drops can not appear, thereby make the box be difficult for the landing at hoist and mount in-process.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of the present invention with the door open;
FIG. 3 is a schematic view of a top cross-sectional view of the connection between the inner cleaning strip and the door of the present invention;
FIG. 4 is an enlarged view of a portion of the area A in FIG. 3 according to the present invention;
FIG. 5 is a schematic structural view of a hoisting ring and a connection base block in embodiment 2 of the present invention;
FIG. 6 is a schematic sectional view of the connection of the pin bar and the connection base block according to embodiment 2 of the present invention from above;
in the figure: 1. a box body; 2. a box door; 3. an oval pull groove; 4. pulling the block; 5. hoisting a ring; 6. a transparent viewing mirror; 7. a strip-shaped sliding opening; 8. a circular push block; 9. cleaning the inner strip; 10. cleaning the sponge; 11. a base strip; 12. a base block; 13. an inner resisting block; 14. a first spring chamber; 15. sleeving blocks; 16. a screw; 17. a circular through hole; 18. connecting the base blocks; 19. a second spring chamber; 20. a hemispherical fixture block; 21. an annular neck; 22. a rod hole; 23. a pin rod.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1 to 4, the present invention provides a technical solution: the oil field online continuous weighing and flow measuring device comprises a box body 1 and four hoisting rings 5 arranged at the top of the box body 1, wherein the front surface of the box body 1 is rotatably connected with a box door 2 through a hinge, oil inlet and outlet openings are arranged on both sides of the box body 1, a viewing opening is arranged inside the box door 2, a transparent viewing mirror 6 is embedded inside the viewing opening, a cleaning inner strip 9 is arranged on the inner side surface of the box door 2, a cleaning sponge 10 is arranged on the inner side surface of the cleaning inner strip 9, the top end of the cleaning sponge 10 is attached to the inner side surface of the transparent viewing mirror 6, two integrated base blocks 12 are arranged on the inner side surface of the cleaning inner strip 9, two circular push blocks 8 corresponding to the base blocks 12 are arranged on the outer side surface of the box door 2, a first spring chamber 14 is arranged inside the base block 12, an inner abutting block 13 is connected to the end part of the first spring chamber 14 through a spring, a screw 16 is, and the inside spring housing of first spring room 14 establishes on the screw rod 16 surface, two bar spout 7 corresponding with screw rod 16 are seted up to the inside of chamber door 2, and the top of screw rod 16 runs through to the outside of chamber door 2, the inboard surface of circular ejector pad 8 is equipped with the nested piece 15 of integral type, the top of screw rod 16 is passed through the threaded fixation in nested piece 15's inside, make operating personnel can be under the condition of not opening chamber door 2, direct through promoting from top to bottom circular ejector pad 8, cause cleaning sponge 10 to carry out effectual clearance to the inboard surface of transparent sight glass 6.
In this embodiment, preferably, the top end surface of the screw 16 is provided with an external thread, and the inside of the sleeve block 15 is provided with a thread groove corresponding to the top end of the screw 16, and the thread of the inner wall of the thread groove matches with the external thread, so that the top end of the screw 16 can be smoothly fixed inside the sleeve block 15.
In this embodiment, preferably, the bottom end of the cleaning sponge 10 is fixed with a base strip 11 by gluing, the inner side of the cleaning inner strip 9 is provided with a fixing groove matched with the base strip 11, and the base strip 11 is fixed inside the fixing groove by a screw, so that the cleaning sponge 10 can be smoothly installed on the inner side surface of the cleaning inner strip 9.
In this embodiment, preferably, the surface of the screw 16 is provided with an integrated annular protrusion, and the annular protrusion is located inside the strip-shaped sliding opening 7, so that the contact area between the screw 16 and the inner wall of the strip-shaped sliding opening 7 can be reduced, and the screw 16 can easily slide inside the strip-shaped sliding opening 7.
Example 2
Referring to fig. 1 to 6, the present invention provides a technical solution: the oil field online continuous weighing and flow measuring device comprises a box body 1 and four hoisting rings 5 arranged at the top of the box body 1, wherein the front surface of the box body 1 is rotatably connected with a box door 2 through a hinge, oil inlet and outlet openings are arranged on both sides of the box body 1, a viewing opening is arranged inside the box door 2, a transparent viewing mirror 6 is embedded inside the viewing opening, a cleaning inner strip 9 is arranged on the inner side surface of the box door 2, a cleaning sponge 10 is arranged on the inner side surface of the cleaning inner strip 9, the top end of the cleaning sponge 10 is attached to the inner side surface of the transparent viewing mirror 6, two integrated base blocks 12 are arranged on the inner side surface of the cleaning inner strip 9, two circular push blocks 8 corresponding to the base blocks 12 are arranged on the outer side surface of the box door 2, a first spring chamber 14 is arranged inside the base block 12, an inner abutting block 13 is connected to the end part of the first spring chamber 14 through a spring, a screw 16 is, and the inside spring housing of first spring room 14 establishes on the screw rod 16 surface, two bar spout 7 corresponding with screw rod 16 are seted up to the inside of chamber door 2, and the top of screw rod 16 runs through to the outside of chamber door 2, the inboard surface of circular ejector pad 8 is equipped with the nested piece 15 of integral type, the top of screw rod 16 is passed through the threaded fixation in nested piece 15's inside, make operating personnel can be under the condition of not opening chamber door 2, direct through promoting from top to bottom circular ejector pad 8, cause cleaning sponge 10 to carry out effectual clearance to the inboard surface of transparent sight glass 6.
In this embodiment, it is preferable, the bottom of hoisting ring 5 is equipped with the connection base block 18 of integral type, and the top surface of box 1 sets up four base block grooves with being connected base block 18 looks adaptation, two oval pull grooves 3 that position and base block groove correspond are all seted up to the front surface and the rear surface of box 1, and the inside of oval pull groove 3 is provided with draws piece 4, the inboard of drawing piece 4 is equipped with the pin rod 23 of integral type, the pole hole 22 with pin rod 23 looks adaptation is all seted up to the inside both sides in base block groove, and one of them pole hole 22 communicates with each other with oval pull groove 3, the circular through-hole 17 with pin rod 23 looks adaptation is seted up to the inside of connecting base block 18, and be provided with block mechanism between pin rod 23 and the circular through-hole 17, make hoisting ring 5 easily pull down when appearing fracture and damaging and change, and compare original threaded fixation more firm.
In this embodiment, preferably, the engaging mechanism includes two hemispherical retainers 20 disposed on the surface of the pin rod 23, and two annular retaining grooves 21 corresponding to the hemispherical retainers 20 are disposed on the inner wall of the circular through hole 17, so that the pin rod 23 can be limited after being inserted into the circular through hole 17.
In this embodiment, preferably, the bottom end of the hemispherical stopper 20 is connected to the second spring chamber 19 through a spring, and the second spring chamber 19 is located inside the pin 23, so that the top end of the hemispherical stopper 20 is extruded into the second spring chamber 19 when being extruded.
In this embodiment, preferably, the top end surface of the screw 16 is provided with an external thread, and the inside of the sleeve block 15 is provided with a thread groove corresponding to the top end of the screw 16, and the thread of the inner wall of the thread groove matches with the external thread, so that the top end of the screw 16 can be smoothly fixed inside the sleeve block 15.
In this embodiment, preferably, the bottom end of the cleaning sponge 10 is fixed with a base strip 11 by gluing, the inner side of the cleaning inner strip 9 is provided with a fixing groove matched with the base strip 11, and the base strip 11 is fixed inside the fixing groove by a screw, so that the cleaning sponge 10 can be smoothly installed on the inner side surface of the cleaning inner strip 9.
In this embodiment, preferably, the surface of the screw 16 is provided with an integrated annular protrusion, and the annular protrusion is located inside the strip-shaped sliding opening 7, so that the contact area between the screw 16 and the inner wall of the strip-shaped sliding opening 7 can be reduced, and the screw 16 can easily slide inside the strip-shaped sliding opening 7.
The model of the box body 1 is HWLDJ-II.
The working principle and the using process of the invention are as follows: when the online metering box for the oil field is used, the flow in the oil field pipeline can be measured in real time only by connecting the oil inlet and the oil outlet on the two sides of the box body 1 with the oil field pipeline;
when the inner side surface of the transparent observation mirror 6 needs to be cleaned, only two circular push blocks 8 need to be pinched and the circular push blocks 8 are pulled to the front of the box door 2 with force, so that the screw 16 pulls the inner abutting block 13 and the spring in the first spring chamber 14 applies thrust to the base block 12 and the cleaning inner strip 9, the top end of the cleaning sponge 10 is tightly attached to the inner side surface of the transparent observation mirror 6, at the moment, the circular push blocks 8 are pushed up and down, the top end of the cleaning sponge 10 is fully rubbed on the inner side surface of the transparent observation mirror 6, the inner side surface of the transparent observation mirror 6 can be effectively cleaned, and the problem that the inner side surface of the transparent observation mirror 6 can be cleaned only by opening the box door 2 in the original device is solved;
when the hoisting ring 5 needs to be installed on the top surface of the box body 1, only the connection base block 18 needs to be inserted into the base block groove at the top of the box body 1, then the pin rod 23 is inserted into the oval pull groove 3, and the end part of the pin rod 23 penetrates through the rod hole 22 and is inserted into the circular through hole 17, the top end of the hemispherical fixture block 20 is gradually extruded into the second spring chamber 19 in the insertion process of the pin rod 23, so that the end part of the pin rod 23 can be smoothly inserted into the circular through hole 17, and the end part of the pin rod 23 can be inserted into the rod hole 22 at the other side of the base block groove, so that the pull block 4 can be positioned inside the oval pull groove 3, and the hemispherical fixture block 20 is clamped into the annular fixture groove 21 under the action of the spring inside the second spring chamber 19, so that the pin rod 23 can be smoothly clamped and connected with the connection base block 18, and the connection base block 18 can be smoothly fixed inside the base block groove, can be normal hoist box 1 through hoisting ring 5, and owing to the effect of pin pole 23 at the hoist and mount in-process, make and connect base block 18 and can block the inside in base block groove always, thereby make box 1 hoist and mount in-process more firm, compare in the original device and fix hoisting ring 5 at the top of box 1 through the screw thread, can be so that be connected between hoisting ring 5 and the box 1 more firm, avoided leading to the fact hoisting ring 5 probably to have the problem that drops because of the screw thread is not hard up.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. On-line continuous weighing flow measuring device in oil field, including box (1) and four hoisting ring (5) of setting at box (1) top, there is chamber door (2) front surface of box (1) through hinge swivelling joint, and the inside of chamber door (2) has seted up the viewing aperture, the inside of viewing aperture is provided with transparent sight glass (6), its characterized in that: the inner side surface of the box door (2) is provided with a cleaning inner strip (9), the inner side surface of the cleaning inner strip (9) is provided with a cleaning sponge (10), the top end of the cleaning sponge (10) is attached to the inner side surface of the transparent observation mirror (6), the inner side surface of the cleaning inner strip (9) is provided with two integrated base blocks (12), the outer side surface of the box door (2) is provided with two circular push blocks (8) corresponding to the base blocks (12), a first spring chamber (14) is arranged inside the base blocks (12), the end part of the first spring chamber (14) is connected with an inner abutting block (13), one side of the inner abutting block (13) is fixedly welded with a screw rod (16), two strip-shaped sliding openings (7) corresponding to the screw rod (16) are formed inside the box door (2), and the top end of the screw rod (16) penetrates through the outer side of the box door (2), the inner side surface of the round push block (8) is provided with an integrated sleeve block (15), and the top end of the screw rod (16) is fixed in the sleeve block (15).
2. The oilfield on-line continuous weighing flow measuring device of claim 1, wherein: the bottom of hoisting ring (5) is equipped with the connection base block (18) of integral type, and the top surface of box (1) set up four base block grooves with being connected base block (18) looks adaptation, the oval pull groove (3) that two positions and base block groove phase correspond are all seted up to the front surface and the rear surface of box (1), and the inside of oval pull groove (3) is provided with pull block (4), the inboard of pull block (4) is equipped with pin rod (23) of integral type, rod hole (22) with pin rod (23) looks adaptation are all seted up to the inside both sides in base block groove, and one of them rod hole (22) communicates with each other with oval pull groove (3), circular through-hole (17) with pin rod (23) looks adaptation are seted up to the inside of connecting base block (18), and are provided with block mechanism between pin rod (23) and circular through-hole (17).
3. The oilfield on-line continuous weighing flow measuring device of claim 2, wherein: the clamping mechanism comprises two hemispherical clamping blocks (20) arranged on the surface of the pin rod (23), and two annular clamping grooves (21) corresponding to the hemispherical clamping blocks (20) are formed in the inner wall of the circular through hole (17).
4. The oilfield on-line continuous weighing flow measuring device of claim 3, wherein: the bottom end of the hemispherical fixture block (20) is connected with a second spring chamber (19), and the second spring chamber (19) is positioned inside the pin rod (23).
5. The oilfield on-line continuous weighing flow measuring device of claim 1, wherein: the top end surface of the screw rod (16) is provided with an external thread, the inside of the sleeve block (15) is provided with a thread groove corresponding to the top end of the screw rod (16), and the thread of the inner wall of the thread groove is matched with the external thread.
6. The oilfield on-line continuous weighing flow measuring device of claim 1, wherein: the bottom of clean sponge (10) is glued and is fixed with base strip (11), and the fixed slot with base strip (11) looks adaptation is seted up to the inboard of clean interior strip (9), base strip (11) are passed through the screw fixation inside the fixed slot.
7. The oilfield on-line continuous weighing flow measuring device of claim 1, wherein: the surface of the screw rod (16) is provided with an integrated circular ring bulge, and the circular ring bulge is positioned inside the strip-shaped sliding opening (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911084045.0A CN110907001B (en) | 2019-11-07 | 2019-11-07 | On-line continuous weighing and flow measuring device for oil field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911084045.0A CN110907001B (en) | 2019-11-07 | 2019-11-07 | On-line continuous weighing and flow measuring device for oil field |
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| Publication Number | Publication Date |
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| CN110907001A true CN110907001A (en) | 2020-03-24 |
| CN110907001B CN110907001B (en) | 2021-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911084045.0A Active CN110907001B (en) | 2019-11-07 | 2019-11-07 | On-line continuous weighing and flow measuring device for oil field |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5335552A (en) * | 1993-07-07 | 1994-08-09 | Martin Marietta Energy Systems, Inc. | Device for accurately measuring mass flow of gases |
| CN2257922Y (en) * | 1995-11-09 | 1997-07-16 | 石家庄热电煤气集团公司现代厨房设备厂 | Gas meter dirt-proof cover |
| CN202648717U (en) * | 2012-07-12 | 2013-01-02 | 成都科盛石油科技有限公司 | Oilfield oil flow measuring system based on TDC-GP2 |
| CN202885892U (en) * | 2012-09-29 | 2013-04-17 | 大唐黄岛发电有限责任公司 | Automatic purging device for clean flue gas flow measurement |
| CN207688999U (en) * | 2017-12-08 | 2018-08-03 | 上海悟道机电设备有限公司 | A kind of measuring apparatus that flow is weighed |
| CN109341801A (en) * | 2018-10-10 | 2019-02-15 | 南安市永途工业设计有限公司 | A kind of meter box with the auxiliary water meter of super-pressure magnetic field magnetic water heat |
-
2019
- 2019-11-07 CN CN201911084045.0A patent/CN110907001B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5335552A (en) * | 1993-07-07 | 1994-08-09 | Martin Marietta Energy Systems, Inc. | Device for accurately measuring mass flow of gases |
| CN2257922Y (en) * | 1995-11-09 | 1997-07-16 | 石家庄热电煤气集团公司现代厨房设备厂 | Gas meter dirt-proof cover |
| CN202648717U (en) * | 2012-07-12 | 2013-01-02 | 成都科盛石油科技有限公司 | Oilfield oil flow measuring system based on TDC-GP2 |
| CN202885892U (en) * | 2012-09-29 | 2013-04-17 | 大唐黄岛发电有限责任公司 | Automatic purging device for clean flue gas flow measurement |
| CN207688999U (en) * | 2017-12-08 | 2018-08-03 | 上海悟道机电设备有限公司 | A kind of measuring apparatus that flow is weighed |
| CN109341801A (en) * | 2018-10-10 | 2019-02-15 | 南安市永途工业设计有限公司 | A kind of meter box with the auxiliary water meter of super-pressure magnetic field magnetic water heat |
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| CN110907001B (en) | 2021-03-19 |
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