CN112729428A - High-precision V-shaped cone flowmeter - Google Patents
High-precision V-shaped cone flowmeter Download PDFInfo
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- CN112729428A CN112729428A CN202110049262.7A CN202110049262A CN112729428A CN 112729428 A CN112729428 A CN 112729428A CN 202110049262 A CN202110049262 A CN 202110049262A CN 112729428 A CN112729428 A CN 112729428A
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- pipe
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
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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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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention discloses a high-precision V-shaped cone flowmeter, which belongs to the field of fluid measurement and comprises a measuring pipe, wherein an L-shaped pressure taking pipe and a V-shaped cone are arranged in the measuring pipe, the L-shaped pressure taking pipe penetrates through the inside of the V-shaped cone, two pressure taking holes are formed in the inner wall of the measuring pipe in a penetrating manner, a first pressure taking pipe and a second pressure taking pipe are respectively installed on the outer side of the measuring pipe corresponding to the two pressure taking holes, and valves are installed on the first pressure taking pipe and the second pressure taking pipe. The invention realizes accurate measurement of the fluid, and simultaneously, the spring and the cleaning mechanism are arranged to clean the interior of the L-shaped pressure taking pipe, and the cleaning effect of the L-shaped pressure taking pipe is more thorough without residue under the combined action of the back flushing interface and the fluid.
Description
Technical Field
The invention relates to the technical field of fluid measurement, in particular to a high-precision V-shaped cone flowmeter.
Background
With the progress and development of flow measurement technology, a V-cone flowmeter is developed, which changes the throttling layout of the traditional differential pressure type meter, and changes the throttling from a central hole into pipe wall annular throttling. The V-shaped cone belongs to a differential pressure generating device with the side wall (annular space) shrinking, reducing and gradually expanding. The V-shaped cone flowmeter has the greatest advantage that the front 3D and the back 1D (D is the inner diameter of the pipeline) of the straight pipe section are required, and because the conical throttling element is hung in the center of the pipeline, fluid is forced to flow along the cone when flowing through the throttling element, so that a forced rectification process is formed.
Through retrieval, the Chinese patent No. CN 208296908U discloses a high-precision rectangular V-shaped cone flowmeter, which is connected in series in a process pipeline to be tested with a rectangular section; the flowmeter comprises a measuring pipe, and body flanges are arranged at two ends of the measuring pipe; a V-shaped cone is arranged in the measuring pipe; a positive pressure taking hole and a negative pressure taking hole which penetrate through the pipe wall are sequentially arranged on the pipe wall of the measuring pipe along the flowing direction of the fluid; the negative pressure taking hole is connected with the vertical section of the L-shaped pressure taking pipe inside the measuring pipe, and the horizontal section of the L-shaped pressure taking pipe penetrates through the V-shaped cone along the central axis; the positive pressure taking hole and the negative pressure taking hole are respectively connected with two pressure taking short pipes on the outer side of the measuring pipe, and the two pressure taking short pipes are respectively connected with two S-shaped pressure taking pipes through two pressure taking valves; back-blowing interfaces are arranged on the S-shaped pressure tapping pipes; the two S-shaped pressure sampling pipes are connected with the three valve banks.
When the V-shaped cone flowmeter in the prior art is actually used, the following defects still exist: although the flowmeter is provided with the back flushing interface, a certain cleaning effect can be realized, because the fluid is under the action of pressure in the L-shaped pressure sampling pipe, no matter impurities in the liquid or gas fluid are easy to form adsorption residues in the L-shaped pressure sampling pipe, the cleaning effect of the back flushing interface is not good, and therefore the invention provides the high-precision V-shaped cone flowmeter again.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a high-precision V-shaped cone flowmeter.
In order to achieve the purpose, the invention adopts the following technical scheme:
a high-precision V-shaped cone flowmeter comprises a measuring tube, wherein an L-shaped pressure taking tube and a V-shaped cone are arranged in the measuring tube, the L-shaped pressure taking pipe penetrates through the inside of the V-shaped cone, two pressure taking holes are formed in the inner wall of the measuring pipe in a penetrating manner, a first pressure taking pipe and a second pressure taking pipe are respectively arranged at the outer side of the measuring pipe corresponding to the two pressure taking holes, the first pressure taking pipe and the second pressure taking pipe are both provided with valves, the ends of the first pressure taking pipe and the second pressure taking pipe, which are far away from the measuring pipe, are both provided with S-shaped pressure taking pipes, the two S-shaped pressure taking pipes are both arranged with a three-valve group, the two S-shaped pressure taking pipes are both provided with back flushing interfaces, the back-blowing interfaces are provided with valves, the vertical section of the L-shaped pressure-taking pipe is arranged at a pressure-taking hole corresponding to the second pressure-taking pipe, and the horizontal section of the L-shaped pressure-taking pipe is fixed with the inner wall of the measuring pipe through a first support;
wear to be equipped with the spring in the L shape is got the pressure tube, the spring is kept away from the second and is got the one end of pressing the tube and extend to the L shape and get the horizontal segment outside of pressing the tube, be equipped with clean mechanism in the survey buret, clean mechanism includes the sleeve pipe, the cover pipe box is established and is fixed and keep away from the second and get the one end of pressing the tube at the spring, be fixed with the second support on the lateral wall of spring, the one end that the spring was kept away from to the second support is fixed with the interior circumference of swivel becket, the outer circumference of swivel becket rotates the cover and is equipped with the mounting, the inner wall at survey buret is fixed to the mounting, one side that the pipe was got to the swivel becket and is fixed with the ring gear, survey the motor is installed to the lateral wall of bure.
Further, the three valve groups are connected with the differential pressure transmitter and used for correcting the zero point of the differential pressure transmitter.
Furthermore, the two ends of the measuring pipe are connected with a pipeline to be measured through flanges, the cross section of the measuring pipe is rectangular, and the V-shaped cone is a quadrangular frustum-shaped throttling element.
Further, the spring is inserted in the L-shaped pressure tapping pipe and is in frictional contact with the inner wall of the L-shaped pressure tapping pipe.
Furthermore, 2-4 first supports are installed at one end, far away from the second pressure taking pipe, of the horizontal section of the L-shaped pressure taking pipe, and the first supports are fixedly installed on the inner wall of the measuring pipe.
Furthermore, the fixing piece is of a rectangular structure, and a round hole matched with the rotating ring is formed in the middle of the fixing piece.
Furthermore, two limiting sliding rings are mounted on the outer circumference of the rotating ring, and the rotating ring is rotatably mounted with the fixing piece through the limiting sliding rings.
Furthermore, a plurality of balls are embedded in the outer circumference of the rotating ring in a rolling manner and are positioned between the two limiting sliding rings.
Furthermore, the gear is a bevel gear, the gear ring is a bevel gear ring, and the gear ring and the gear are meshed with each other.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention can clean the interior of the L-shaped pressure pipe by arranging the spring and the cleaning mechanism while realizing accurate measurement of the fluid, and simultaneously, the cleaning effect of the L-shaped pressure pipe is more thorough without residues by matching the combined action of the back-blowing interface.
2. The invention adopts the technical scheme that the rotatable spring is arranged in the L-shaped pressure sampling pipe, so that on one hand, the inside of the L-shaped pressure sampling pipe can be cleaned, and meanwhile, the normal flow of fluid through the L-shaped pressure sampling pipe can be ensured, and the normal measurement effect can be ensured.
In conclusion, the spring and the cleaning mechanism are arranged to clean the inside of the L-shaped pressure taking pipe while the fluid is accurately measured, the cleaning effect of the L-shaped pressure taking pipe is more thorough without residues under the combined action of the back flushing interface and the fluid, and the spring can clean the inside of the L-shaped pressure taking pipe, and can ensure that the fluid normally flows through the L-shaped pressure taking pipe, so that the normal measuring effect is ensured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a schematic view of the overall structure of a high-precision V-cone flowmeter according to the present invention;
FIG. 2 is an internal cross-sectional view of a high precision V-cone flow meter in accordance with the present invention;
FIG. 3 is an overall schematic view of the cleaning mechanism of the present invention;
FIG. 4 is an enlarged view of the structure of portion A of FIG. 3;
FIG. 5 is an enlarged view of the structure of portion B of FIG. 3;
FIG. 6 is a general schematic view of the swivel ring of FIG. 3;
FIG. 7 is a sectional view taken along line a-a of FIG. 2;
fig. 8 is a sectional view taken along line b-b in fig. 3.
In the figure: the device comprises a measuring pipe 1, a first pressure taking pipe 2, a second pressure taking pipe 3, a three-valve group 4, a back-blowing interface 5, a motor 6, a 7L-shaped pressure taking pipe, a 8V-shaped cone, a first support 9, a spring 10, a sleeve 11, a second support 12, a rotating ring 13, a fixing part 14, a limiting sliding ring 15, a ball 16, a toothed ring 17 and a gear 18.
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.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Referring to fig. 1-8, a high-precision V-shaped cone flowmeter comprises a measuring tube 1, wherein an L-shaped pressure tapping pipe 7 and a V-shaped cone 8 are arranged in the measuring tube 1, the L-shaped pressure tapping pipe 7 penetrates through the inside of the V-shaped cone 8, and fluid can flow along an annular channel between the V-shaped cone 8 and the inner wall of the measuring tube 1; run through on surveying buret 1 ' S the inner wall and seted up two and get the pressure hole, two are got the pressure hole for just getting respectively and are got the pressure hole and get the pressure hole for the burden, survey buret 1 ' S the outside and correspond two and get pressure hole department and install first pressure pipe 2 and second respectively and get pressure pipe 3, and first pressure pipe 2 and second are got and are pressed pipe 3 and all install the valve, the second is got and is pressed pipe 3 and get pressure hole department installation with the burden, first pressure pipe 2 and second are got and are pressed pipe 3 and keep away from surveying buret 1 ' S one end and all install the S-shaped pressure pipe, two S-shaped pressure pipes are got and are pressed pipe 4 installations with a three valves jointly, three valves 4 connect differential pressure.
The two S-shaped pressure sampling pipes are respectively provided with a back-blowing interface 5, the back-blowing interfaces 5 are respectively provided with a valve, the back-blowing interfaces 5 are used for connecting back-blowing fluid, and the back-blowing fluid can be gas or liquid.
The vertical section of the L-shaped pressure taking pipe 7 is arranged at a pressure taking hole corresponding to the second pressure taking pipe 3, and the horizontal section of the L-shaped pressure taking pipe 7 is fixed with the inner wall of the measuring pipe 1 through a first support 9;
wear to be equipped with spring 10 in L shape pressure pipe 7, the one end that the second pressure pipe 3 was got to the second was kept away from to spring 10 extends to the L shape and gets the horizontal segment outside of pressing pipe 7, be equipped with clean mechanism in surveying buret 1, clean mechanism includes sleeve pipe 11, the sleeve pipe 11 cover is established and is fixed the one end of keeping away from the second pressure pipe 3 at spring 10, be fixed with second support 12 on spring 10's the lateral wall, the one end that spring 10 was kept away from to second support 12 is fixed with the interior circumference of swivel ring 13, the outer circumference of swivel ring 13 rotates the cover and is equipped with mounting 14, mounting 14 fixes the inner wall at surveying buret 1, one side that swivel ring 13 is close to L shape pressure pipe 7 is fixed with ring gear 17, survey buret 1's lateral wall and install motor 6, the actuating lever is installed to the drive end of motor 6, the.
In this embodiment, survey the both ends of buret 1 and pass through flange joint with the pipeline that awaits measuring, survey the cross-section of buret 1 and be the rectangle, V-arrangement cone 8 is four prismatic table form throttling element.
In this embodiment, the spring 10 is inserted inside the L-shaped pressure tapping pipe 7 and frictionally contacts the inner wall of the L-shaped pressure tapping pipe 7. The spring 10 is composed of a stainless steel wire and rubber wrapped around the outside of the stainless steel wire. When the spring 10 rotates in the L-shaped pressure sampling pipe 7, dirt adsorbed on the inner wall of the L-shaped pressure sampling pipe 7 can be cleaned.
In this embodiment, 2-4 first supports 9 are installed at one end of the horizontal section of the L-shaped pressure tapping pipe 7, which is far away from the second pressure tapping pipe 3, and the first supports 9 are fixedly installed on the inner wall of the measuring pipe 1. In this embodiment, the number of the first brackets 9 is 4. The first support 9 is used for supporting and fixing the L-shaped pressure tapping pipe 7.
In this embodiment, the fixing member 14 has a rectangular structure, and a circular hole matched with the rotating ring 13 is formed in the middle of the fixing member. The measuring tube 1 has a rectangular cross-section and the fixing members 14 are uniform. In other embodiments, the measuring tube 1 may also have a conventional circular cross-section, and the fastening elements 14 may then have a circular configuration.
In this embodiment, two limiting slip rings 15 are installed on the outer circumference of the rotating ring 13, and the rotating ring 13 is rotatably installed with the fixing member 14 through the limiting slip rings 15.
In this embodiment, a plurality of balls 16 are embedded on the outer circumference of the rotating ring 13 in a rolling manner, and the balls 16 are located between the two limiting slip rings 15. The balls 16 serve to reduce friction when the rotating ring 13 rotates inside the stationary member 14.
In this embodiment, the gear 18 is a bevel gear, the ring gear 17 is a bevel ring gear, and the ring gear 17 and the gear 18 are engaged with each other.
The working principle and the using process of the invention are as follows:
the three valve groups 4 are used for connecting the differential pressure transmitter and correcting the zero point of the differential pressure transmitter, and the annular channel between the V-shaped cone 8 and the inner wall of the measuring tube 1 flows to form a strong rectification process, so that the flow field can be stable, the eddy current is minimized, and a stable differential pressure signal is finally obtained. The L-shaped sampling tube 7 is used for connecting the conical throttling element and taking a negative pressure signal. One side of the second pressure sampling pipe 3 is connected with the measuring pipe 1, and a valve is arranged for transmitting differential pressure signals.
When cleaning L shape sampling tube 7, blowback interface 5 inserts air current or liquid, motor 6 drive gear 18 and ring gear 17 meshing transmission, can drive swivel 13 this moment and rotate, drive sleeve pipe 11 through second support 12 simultaneously and rotate, sleeve pipe 11 is torsion spring 10 then, spring 10 can be at L shape pressure sampling tube 7 internal rotation this moment to clear up the spot of its inner wall, the blowback fluid of cooperation blowback interface 5, thereby clear up out L shape pressure sampling tube 7 with the spot, guarantee the cleanliness of L shape pressure sampling tube 7.
Due to the characteristics of the spring 10, when the spring rotates in the L-shaped pressure sampling pipe 7, the shape of the spring can not be changed and restored, and the cleaning of the spring 10 can be realized by matching with the back-blowing fluid of the back-blowing interface 5 in the process.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. The high-precision V-shaped cone flowmeter comprises a measuring pipe (1) and is characterized in that an L-shaped pressure taking pipe (7) and a V-shaped cone (8) are arranged in the measuring pipe (1), the L-shaped pressure taking pipe (7) penetrates through the V-shaped cone (8), two pressure taking holes are formed in the inner wall of the measuring pipe (1) in a penetrating mode, a first pressure taking pipe (2) and a second pressure taking pipe (3) are respectively installed at the positions, corresponding to the two pressure taking holes, of the outer side of the measuring pipe (1), valves are installed on the first pressure taking pipe (2) and the second pressure taking pipe (3), S-shaped pressure taking pipes are installed at one ends, away from the measuring pipe (1), of the first pressure taking pipe (2) and the second pressure taking pipe (3), the two S-shaped pressure taking pipes are installed together with a three valve group (4), a back-blowing interface (5) is installed on the S-shaped pressure taking pipes, and valves are installed on the back-blowing interface (5), the vertical section of the L-shaped pressure taking pipe (7) is arranged at a pressure taking hole corresponding to the second pressure taking pipe (3), and the horizontal section of the L-shaped pressure taking pipe (7) is fixed with the inner wall of the measuring pipe (1) through a first support (9);
wear to be equipped with spring (10) in L shape pressure pipe (7), the one end that the second pressure pipe (3) was kept away from in spring (10) extends to the L shape and gets the horizontal segment outside of pressing pipe (7), be equipped with clean mechanism in surveying buret (1), clean mechanism includes sleeve pipe (11), sleeve pipe (11) cover is established and is fixed in the one end that the second pressure pipe (3) was kept away from in spring (10), be fixed with second support (12) on the lateral wall of spring (10), the one end that spring (10) were kept away from in second support (12) is fixed with the interior circumference of rotating ring (13), the outer circumference rotating sleeve of rotating ring (13) is equipped with mounting (14), the inner wall at surveying buret (1) is fixed in mounting (14), one side that L shape pressure pipe (7) is close to in rotating ring (13) is fixed with ring gear (17), motor (6) are installed to the lateral wall of surveying buret (1), the drive end of motor (6) installs the actuating lever, the actuating lever runs through to the inboard of surveying buret (1) and installs gear (18), gear (18) and ring gear (17) intermeshing.
2. The high accuracy V-cone flowmeter of claim 1 wherein said three valve sets (4) are connected to a differential pressure transmitter and used to calibrate differential pressure transmitter zero.
3. The high-precision V-shaped cone flowmeter as claimed in claim 1, wherein both ends of the measuring tube (1) are connected with a pipeline to be measured through flanges, the cross section of the measuring tube (1) is rectangular, and the V-shaped cone (8) is a quadrangular frustum shaped throttling element.
4. A high precision V-shaped cone flow meter according to claim 1, characterized in that the spring (10) is inserted inside the L-shaped pressure-taking pipe (7) and is in frictional contact with the inner wall of the L-shaped pressure-taking pipe (7).
5. The high-precision V-shaped cone flowmeter as claimed in claim 1, wherein 2-4 first brackets (9) are mounted at one end of the horizontal section of the L-shaped pressure sampling pipe (7) far away from the second pressure sampling pipe (3), and the first brackets (9) are fixedly mounted with the inner wall of the measuring pipe (1).
6. The high-precision V-shaped cone flowmeter as claimed in claim 1, wherein the fixed part (14) is of a rectangular structure, and a circular hole matched with the rotating ring (13) is formed in the middle of the fixed part.
7. A high accuracy V-shaped cone flowmeter according to claim 1 or 6, characterized in that two limit slip rings (15) are mounted on the outer circumference of the rotating ring (13), and the rotating ring (13) is rotatably mounted with the fixed part (14) through the limit slip rings (15).
8. The high-precision V-shaped cone flowmeter as claimed in claim 7, wherein a plurality of balls (16) are embedded on the outer circumference of the rotating ring (13) in a rolling manner, and the balls (16) are located between two limiting slide rings (15).
9. A high precision V-shaped cone flowmeter according to claim 1, wherein said gear (18) is a bevel gear, said ring gear (17) is a bevel ring gear, and said ring gear (17) and gear (18) are meshed with each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110049262.7A CN112729428B (en) | 2021-01-14 | 2021-01-14 | High-precision V-shaped cone flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110049262.7A CN112729428B (en) | 2021-01-14 | 2021-01-14 | High-precision V-shaped cone flowmeter |
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| Publication Number | Publication Date |
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| CN112729428A true CN112729428A (en) | 2021-04-30 |
| CN112729428B CN112729428B (en) | 2023-02-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110049262.7A Active CN112729428B (en) | 2021-01-14 | 2021-01-14 | High-precision V-shaped cone flowmeter |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110259119A1 (en) * | 2007-07-13 | 2011-10-27 | McCrometer, Inc | Two-phase flow meter |
| EP2177967B1 (en) * | 2008-10-20 | 2012-12-12 | Schneider Elektronik GmbH | Volume flow measuring device and volume flow regulator with same |
| CN208254557U (en) * | 2018-06-27 | 2018-12-18 | 天津浩天自动化仪表制造有限公司 | A kind of small pipeline V-type taper flow meter |
| CN208296908U (en) * | 2018-06-27 | 2018-12-28 | 天津浩天自动化仪表制造有限公司 | A kind of high-precision rectangular V shape cone flow meter |
| CN208643557U (en) * | 2018-06-30 | 2019-03-26 | 禹州市新光铸造有限公司 | A kind of cleaning device for inner wall of pipeline |
| CN109533827A (en) * | 2018-11-29 | 2019-03-29 | 安徽康乐机械科技有限公司 | A kind of tube-type spiral conveyer |
| CN111790700A (en) * | 2020-06-09 | 2020-10-20 | 深圳供电局有限公司 | Pipeline dredging device |
| CN211892484U (en) * | 2020-03-18 | 2020-11-10 | 塔斯科智能科技(青岛)有限公司 | Shower nozzle for ink jet numbering machine convenient to it is clean |
-
2021
- 2021-01-14 CN CN202110049262.7A patent/CN112729428B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110259119A1 (en) * | 2007-07-13 | 2011-10-27 | McCrometer, Inc | Two-phase flow meter |
| EP2177967B1 (en) * | 2008-10-20 | 2012-12-12 | Schneider Elektronik GmbH | Volume flow measuring device and volume flow regulator with same |
| CN208254557U (en) * | 2018-06-27 | 2018-12-18 | 天津浩天自动化仪表制造有限公司 | A kind of small pipeline V-type taper flow meter |
| CN208296908U (en) * | 2018-06-27 | 2018-12-28 | 天津浩天自动化仪表制造有限公司 | A kind of high-precision rectangular V shape cone flow meter |
| CN208643557U (en) * | 2018-06-30 | 2019-03-26 | 禹州市新光铸造有限公司 | A kind of cleaning device for inner wall of pipeline |
| CN109533827A (en) * | 2018-11-29 | 2019-03-29 | 安徽康乐机械科技有限公司 | A kind of tube-type spiral conveyer |
| CN211892484U (en) * | 2020-03-18 | 2020-11-10 | 塔斯科智能科技(青岛)有限公司 | Shower nozzle for ink jet numbering machine convenient to it is clean |
| CN111790700A (en) * | 2020-06-09 | 2020-10-20 | 深圳供电局有限公司 | Pipeline dredging device |
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| CN112729428B (en) | 2023-02-17 |
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Effective date of registration: 20230111 Address after: 257061 No. two, 271 North Road, Shandong, Dongying Applicant after: Shandong Institute of petroleum and chemical engineering Address before: 257061 No. two, 271 North Road, Shandong, Dongying Applicant before: Shengli College China University of Petroleum |
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