CN112325951B - Three-rotor pulsation-free positive displacement flowmeter - Google Patents
Three-rotor pulsation-free positive displacement flowmeter Download PDFInfo
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- CN112325951B CN112325951B CN202011134026.7A CN202011134026A CN112325951B CN 112325951 B CN112325951 B CN 112325951B CN 202011134026 A CN202011134026 A CN 202011134026A CN 112325951 B CN112325951 B CN 112325951B
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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
- G01F1/20—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 detection of dynamic effects of the flow
- G01F1/22—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 detection of dynamic effects of the flow by variable-area meters, e.g. rotameters
-
- 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
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention provides a three-rotor gas positive displacement flowmeter, which comprises a shell, a pulse generator arranged on an end cover of the shell, two metering rotors and a balance rotor, wherein the two metering rotors and the balance rotor are arranged in a measuring chamber in the shell, the metering rotors and the balance rotor are penetrated by a rotating shaft, two ends of the rotating shaft are respectively propped against and fixed with the inner side surfaces of end covers of a front shell and a rear shell, the longitudinal section of the metering rotor is I-shaped, the balance rotor is provided with a plurality of driving blades, the middle is of a cylindrical structure, and the metering rotors are periodically sealed and attached to each other when rotating; the metering rotor in the shape of an I is periodically sealed and attached to the introduced balance rotor, the balance rotor is matched with the metering rotor to rotate together, the airflow flow is more stable, the balloon pulsation is effectively reduced, and the equipment stability is improved.
Description
Technical Field
The invention relates to the field of metering and calibrating of gas volumetric flowmeters, in particular to a three-rotor pulse-free volumetric flowmeter.
Background
The gas volume flowmeter is a Roots flowmeter, also known as a Roots flowmeter. The inner rotor of the flowmeter is in a shape of a waist, the rotor rotates under the action of liquid pressure, the gas with a quantitative volume sealed between the shell and the rotor is discharged every 180 degrees, and a counter connected with the rotor shaft records the rotation times of the rotor or generates a pulse output electric signal in direct proportion to the flow so as to measure the instantaneous and accumulated gas flow.
The existing Roots flowmeter still has some problems, and the number of measuring rotors of the flowmeter is generally 1 to 2, which leads to that the gas discharged by the flowmeter is in a group, so that the flow is in intense vibration during operation, and the flow makes a 'sudden' sound, and the vibration and the noise are large, which are the reasons for generating the pulsating flow, so that the pulsating flow generated by the conventional 2-rotor flowmeter cannot be eliminated.
In addition, a design of 2 pairs of 4 rotors is used on some high-value meters, the design is to eliminate the pulsation flow of the flowmeter, and the pulsation intensity of the airflow at the outlet of the flowmeter is greatly reduced by mutually counteracting the air mass when the air mass is discharged by adjusting the time difference of the exhaust among the rotors, but even the 2 pairs of 4 rotors flowmeter can not thoroughly eliminate the pulsation, and the defects of high cost and overlarge volume exist.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a three-rotor pulsation-free positive displacement flowmeter.
In order to achieve the above purpose, the invention adopts the following technical scheme: the three-rotor pulse-free positive displacement flowmeter comprises a shell, a pulse generator arranged on an end cover of the shell, two metering rotors and a balance rotor, wherein the two metering rotors and the balance rotor are arranged in a measuring chamber in the shell, the metering rotors and the balance rotor are penetrated by a rotating shaft, two ends of the rotating shaft are respectively propped against and fixed with the inner side surfaces of end covers of the front and rear shells, the longitudinal section of the metering rotor is I-shaped, the balance rotor is provided with a plurality of driving blades, the middle part of the balance rotor is of a cylindrical structure and is in periodical sealing fit with the metering rotor when rotating, the I-shaped metering rotor is in periodical sealing fit with the introduced balance rotor, the balance rotor is matched with the metering rotor to rotate together, the airflow is more stable, the airflow pulse energy during the working of the flowmeter is reduced, and the equipment stability is increased; noise and vibration generated when the positive displacement flowmeter works are reduced, so that the working environment of the positive displacement flowmeter is greatly improved, and the service life and measurement accuracy of the flowmeter are improved; the three-rotor design has smaller volume of the flowmeter and more applicable scenes.
Preferably, the metering rotor and the balance rotor rotate, the left metering rotor rotates anticlockwise, the right metering rotor rotates clockwise, the balance rotor rotates clockwise, and the left metering rotor comprises a first driving blade, a second driving blade, a first concave cavity and a second concave cavity; the right metering rotor comprises a third driving blade, a fourth driving blade, a third concave cavity and a fourth concave cavity; the balance rotor at least comprises a fifth driving blade, a sixth driving blade, a seventh driving blade and an eighth driving blade; the internal air flow is operated by the following route while in the measuring chamber:
the cycle is initialized, the second driving blade and the third driving blade are sealed and closed, and the second driving blade and the third driving blade are respectively and hermetically attached to the balance rotor;
the second driving blade is in sealing fit with the balance rotor, and the air flow runs to the right side in the first concave cavity and pushed by the fifth driving blade;
the second driving blade and the third driving blade are in sealing fit, the first driving blade and the fifth driving blade continue to push the air flow to the right side, and the air flow is positioned between the first concave cavity and the fourth concave cavity;
the first driving blade is in sealing fit with the balance rotor, the third driving blade is out of sealing fit with the balance rotor, the fourth driving blade and the fifth driving blade push air flow to move to the right, and the air flow is positioned between the first concave cavity and the fourth concave cavity;
the first driving blade and the fourth driving blade are in sealing fit, the fourth driving blade pushes the air flow to move to the right side, and the air flow is positioned in the fourth concave cavity;
the fourth driving blade is in sealing fit with the balance rotor, the fourth driving blade pushes the air flow to move to the right side, the air flow is in the fourth concave cavity, and the period is ended; the unique operation cycle, through the periodic sealed laminating of measuring rotor and balanced rotor to and between the measuring rotor, remove sealed laminating and let the air current not become a group operation in the measuring chamber, noise and vibrations are reduced.
Preferably, the side surfaces of the metering rotor and the balance rotor are respectively provided with synchronous gears with rotation centers on the rotating shaft, the synchronous gears are matched in size and meshed with each other, the internal stability of the flowmeter with the balance rotor is enhanced by driving the synchronous gears, the three rotors work cooperatively in the measuring chamber, and the metering rotor and the balance rotor are always in a periodical sealing and bonding state.
Preferably, the connection part of the metering rotor and the rotating shaft and the connection part of the balance rotor and the rotating shaft are provided with bearings respectively connected with the metering rotor and the rotating shaft and the balance rotor and the rotating shaft, so that the metering rotor and the balance rotor are smoother when rotating.
Preferably, the bearings are arranged at the joint of the metering rotor and the rotating shaft, and the front and rear positions of the joint of the balancing rotor and the rotating shaft are at least two bearings, so that the stability of the device is improved.
Preferably, the number of the balanced rotor driving blades is 4 or more.
Preferably, the two sides of the shell are respectively provided with a flowmeter shell inlet and a flowmeter shell outlet, the flowmeter shell inlet allows gas to enter, and the flowmeter shell outlet allows gas to be output.
Preferably, the outer sides of the inlet of the flowmeter shell and the outlet of the flowmeter shell are respectively provided with a connecting flange.
Preferably, the inner surface of the measuring chamber is in sealing fit with the periodically rotating contact surface of the metering rotor and the balance rotor.
Compared with the prior art, the invention has the beneficial effects that: the invention has ingenious structure, the I-shaped metering rotor is periodically sealed and attached with the introduced balance rotor, the balance rotor is matched with the metering rotor to rotate together, the unique operation period ensures that the airflow flows more stably, the balloon pulsation is effectively reduced, and the equipment stability is increased; noise and vibration generated during the working of the positive displacement flowmeter are avoided and reduced, so that the working environment of the positive displacement flowmeter is greatly improved, and the service life and the measurement accuracy of the flowmeter are improved; the three-rotor design has smaller volume of the flowmeter and more applicable scenes.
Drawings
FIG. 1 is a longitudinal sectional view of embodiment 1 of the present invention;
FIG. 2 is a front view of embodiment 1 of the present invention;
FIG. 3 is a reverse side view of example 1 of the present invention;
FIG. 4 is a perspective view of embodiment 1 of the present invention;
FIG. 5 is a perspective view of embodiment 1 of the present invention;
FIG. 6 is a schematic diagram illustrating the operation of embodiment 1 of the present invention;
FIG. 7 is a schematic diagram showing the operation steps of embodiment 1 of the present invention;
description of the reference numerals: 1. metering rotor, 2. Balance rotor, 21. Drive vane, 3. Measurement chamber, 31. Inner surface, 4. Shaft, 41. Bearing, 51. Flow meter housing inlet, 52. Flow meter housing outlet, 6. Housing end cap, 7. Synchronous gear, 8. Pulse generator, 11. First drive vane, 12. Second drive vane, 13. First recess, 14. Second recess, 15. Third drive vane, 16. Fourth drive vane, 17. Third recess, 18. Fourth recess, 211. Fifth drive vane, 212. Sixth drive vane, 213. Seventh drive vane, 214. Eighth drive vane.
Detailed Description
For a further understanding of the objects, construction, features, and functions of the invention, reference should be made to the following detailed description of the preferred embodiments.
As shown in fig. 1-3, the three-rotor pulsation-free positive displacement flowmeter comprises a shell and a pulse generator 8 arranged on an end cover 6 of the shell, wherein the pulse generator 8 is also called a proximity frequency sensor or a proximity sensor, the three-rotor pulsation-free positive displacement flowmeter comprises two metering rotors 1 and a balance rotor 2 which are arranged in a measuring chamber 3 in the shell, the metering rotors 1 and the balance rotor 2 are penetrated by a rotating shaft 4, two ends of the rotating shaft 4 are respectively propped against and fixed with the inner side surfaces of the front and rear end covers 6 of the shell, the longitudinal section of the metering rotor 1 is I-shaped, the movement track area of the metering rotor is in a transverse cylindrical shape in the measuring chamber 3, and the sections of the rotating areas of the two metering rotors 1 are tangent.
The balance rotor 2 is provided with a plurality of driving blades 21, the middle of the balance rotor is of a cylindrical structure, the balance rotor is periodically sealed and jointed with the metering rotor 1 during rotation, and the section of the rotation area of the balance rotor 2 in the measuring chamber 3 and the section of the rotation area of the metering rotor 1 are provided with rubber parts.
As shown in fig. 4, the side surfaces of the metering rotor 1 and the balancing rotor 2 are respectively provided with synchronous gears 7 which are in fit and mutual engagement and have rotation centers on the rotating shaft 4, so that the two metering rotors 1 and the one balancing rotor 2 can always maintain a periodically sealed and jointed state according to the set rotation frequency.
As shown in fig. 5, bearings 41 are respectively disposed at the connection between the metering rotor 1 and the rotating shaft 4 and at the connection between the balancing rotor 2 and the rotating shaft 4, so as to respectively connect the metering rotor 1 and the rotating shaft 4 and between the balancing rotor 2 and the rotating shaft 4.
The bearings 41 are respectively arranged at the joint of the metering rotor 1 and the rotating shaft 4, and the front and rear positions of the joint of the balancing rotor 2 and the rotating shaft 4 ensure that the track is stable when the metering rotor 1 and the balancing rotor 2 rotate on the rotating shaft 4, and side movement leakage does not occur, so that the reference degree of flow measurement and calculation is ensured.
The number of the driving blades 21 of the balance rotor 2 is greater than or equal to 4, when the number of the driving blades 21 is not 4, and when the number of the driving blades 21 on the balance rotor 2 is increased, the radius size of the synchronous gear 7 is redesigned according to the actual rotation period, and the number of the driving blades 21 of the balance rotor 2 is specifically designed according to the gas measuring and calculating the different density types without tiring.
The two sides of the shell are respectively provided with a flowmeter shell inlet 51 and a flowmeter shell outlet 52, the flow enters from the flowmeter shell inlet 51, passes through the measuring chamber 3, is guided by the measuring rotor 1 and the balance rotor 2, and is finally discharged at the flowmeter shell outlet 52.
The outer sides of the inlet 51 and the outlet 52 of the flowmeter shell are respectively provided with a connecting flange, so that the flowmeter is convenient to be connected with the inlet equipment and the outlet equipment.
The inner surface 31 of the measuring chamber 3 is in sealing fit with the contact surface of the measuring rotor 1 and the balance rotor 2 when in periodic rotation, the measuring rotor 1 and the balance rotor 2 are driven by the synchronous gear 7 to periodically rotate according to a certain track, the periodic sealing fit between the measuring rotor 1 and the balance rotor 2 is ensured, and meanwhile, the inner surface 31 of the measuring chamber 3 is in sealing fit with the contact surface of the measuring rotor 1 and the balance rotor 2 when in periodic rotation.
In specific use, as shown in fig. 6-7, the metering rotor 1 and the balancing rotor 2 rotate, the left metering rotor 1 rotates anticlockwise, the right metering rotor 1 rotates clockwise, the balancing rotor 2 rotates clockwise, and the left metering rotor 1 comprises a first driving blade 11, a second driving blade 12, a first concave cavity 13 and a second concave cavity 14; the right metering rotor 1 comprises a third driving blade 15, a fourth driving blade 16, a third concave cavity 17 and a fourth concave cavity 18; the balancing rotor 2 includes at least a fifth driving blade 211, a sixth driving blade 212, a seventh driving blade 213, an eighth driving blade 214; the internal air flow is in the measuring chamber 3, operated by the following route:
as shown in fig. 7A, at the beginning of the cycle, the second driving vane 12 and the third driving vane 15 are sealed and closed, and the second driving vane 12 and the third driving vane 15 are respectively sealed and attached to the balance rotor 2;
as shown in fig. 7B, the second driving vane 12 is disengaged from the balance rotor 2, and the air flow runs in the first cavity 13 and is pushed to the right by the fifth driving vane 211;
as shown in fig. 7c, the second driving vane 12 and the third driving vane 15 are in sealing fit, the first driving vane 11 and the fifth driving vane 211 continue to push the air flow to the right side, and the air flow is between the first concave cavity 13 and the fourth concave cavity 18;
as shown in fig. 7D, the first driving vane 11 is in sealing engagement with the balance rotor 2, the third driving vane 15 is out of sealing engagement with the balance rotor 2, the fourth driving vane 16 and the fifth driving vane 211 push the air flow to the right side, and the air flow is between the first concave cavity 13 and the fourth concave cavity 18;
as shown in fig. 7E, the first driving vane 11 is in sealing engagement with the fourth driving vane 16, the fourth driving vane 16 pushes the air flow to the right, and the air flow is in the fourth cavity 18;
as shown in fig. 7F, the fourth driving vane 16 is in sealing engagement with the balance rotor 2, the fourth driving vane 16 pushes the air flow to the right, the air flow is in the fourth cavity 18, and the cycle ends.
At this time, the two measuring rotors 1 rotate for one half of a revolution, and the balance rotor 2 rotates for one quarter of a revolution, which is one cycle.
Under the action of the synchronous gears 7, the two metering rotors 1 and one balance rotor 2 periodically rotate, and when the pulse generator 8 detects the rotation of the metering rotors 1 in a mode that the metering rotors 1 and the balance rotor 2 rotate, an electric pulse which is in fixed proportion to the rotation speed of the metering rotors 1 is sent out.
The invention has been described with respect to the above-described embodiments, however, the above-described embodiments are merely examples of practicing the invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. On the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (8)
1. The utility model provides a three rotor no pulsation type positive displacement flowmeter, includes casing and sets up the pulser on the casing end cover, its characterized in that: the measuring device comprises two measuring rotors and a balance rotor, wherein the two measuring rotors and the balance rotor are arranged in a measuring chamber in a shell, the measuring rotors and the balance rotor are penetrated by a rotating shaft, two ends of the rotating shaft are respectively propped against and fixed with the inner side surfaces of end covers of a front shell and a rear shell, and the longitudinal section of the measuring rotor is I-shaped and comprises two driving blades and two concave cavities; the balance rotor is provided with a plurality of driving blades, the middle of the balance rotor is of a cylindrical structure, and the balance rotor and the metering rotor are periodically sealed and attached to each other when rotating;
the metering rotor and the balance rotor rotate, the left metering rotor rotates anticlockwise, the right metering rotor rotates clockwise, the balance rotor rotates clockwise, the left metering rotor comprises a first driving blade, a second driving blade, a first concave cavity and a second concave cavity; the right metering rotor comprises a third driving blade, a fourth driving blade, a third concave cavity and a fourth concave cavity; the balance rotor at least comprises a fifth driving blade, a sixth driving blade, a seventh driving blade and an eighth driving blade; the internal air flow is operated by the following route while in the measuring chamber:
the cycle is initialized, the second driving blade and the third driving blade are sealed and closed, and the second driving blade and the third driving blade are respectively and hermetically attached to the balance rotor;
the second driving blade is in sealing fit with the balance rotor, and the air flow runs to the right side in the first concave cavity and pushed by the fifth driving blade;
the second driving blade and the third driving blade are in sealing fit, the first driving blade and the fifth driving blade continue to push the air flow to the right side, and the air flow is positioned between the first concave cavity and the fourth concave cavity;
the first driving blade is in sealing fit with the balance rotor, the third driving blade is out of sealing fit with the balance rotor, the fourth driving blade and the fifth driving blade push air flow to move to the right, and the air flow is positioned between the first concave cavity and the fourth concave cavity;
the first driving blade and the fourth driving blade are in sealing fit, the fourth driving blade pushes the air flow to move to the right side, and the air flow is positioned in the fourth concave cavity;
the fourth driving blade is in sealing fit with the balance rotor, the fourth driving blade pushes the air flow to move to the right side, the air flow is in the fourth concave cavity, and the period is ended.
2. The three-rotor, pulse-free positive displacement flowmeter of claim 1, wherein: and the side surfaces of the metering rotor and the balance rotor are respectively provided with synchronous gears with the rotation centers on the rotating shaft, which are matched in size and meshed with each other.
3. The three-rotor, pulse-free positive displacement flowmeter of claim 1, wherein: and bearings are arranged at the joints of the metering rotor and the rotating shaft and at the joints of the balance rotor and the rotating shaft, and are respectively connected with the metering rotor and the rotating shaft and the balance rotor and the rotating shaft.
4. The three-rotor, pulse-free positive displacement flowmeter of claim 3, wherein: the bearing is arranged at the joint of the metering rotor and the rotating shaft, and balances the front and rear positions of the joint of the rotor and the rotating shaft.
5. The three-rotor, pulse-free positive displacement flowmeter of claim 1, wherein: the number of the driving blades of the balance rotor is more than or equal to 4.
6. The three-rotor, pulse-free positive displacement flowmeter of claim 1, wherein: the two sides of the shell are respectively provided with a flowmeter shell inlet and a flowmeter shell outlet.
7. The three rotor, pulse-free positive displacement flowmeter of claim 6, wherein: and connecting flanges are arranged on the outer sides of the inlet of the flowmeter shell and the outlet of the flowmeter shell.
8. The three-rotor, pulse-free positive displacement flowmeter of claim 1, wherein: and the inner surface of the measuring chamber is in sealing fit with the contact surface of the metering rotor and the balance rotor during periodic rotation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011134026.7A CN112325951B (en) | 2020-10-21 | 2020-10-21 | Three-rotor pulsation-free positive displacement flowmeter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011134026.7A CN112325951B (en) | 2020-10-21 | 2020-10-21 | Three-rotor pulsation-free positive displacement flowmeter |
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| Publication Number | Publication Date |
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| CN112325951A CN112325951A (en) | 2021-02-05 |
| CN112325951B true CN112325951B (en) | 2023-09-01 |
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| CN202011134026.7A Active CN112325951B (en) | 2020-10-21 | 2020-10-21 | Three-rotor pulsation-free positive displacement flowmeter |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113309698B (en) * | 2021-06-22 | 2023-03-14 | 中国计量大学 | Multi-component fluid proportional controller |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2754067Y (en) * | 2004-12-10 | 2006-01-25 | 浙江中亚仪表有限公司 | Three-rotor flow meter |
| DE102007029803A1 (en) * | 2007-06-27 | 2009-01-08 | Müller, Josef | Hydraulic gear has fluid, which is moved with adjustable short turbine blades of turbine, and two parallely arranged blade motor are driven by controlling blade that drives drive wheel |
| CN204085600U (en) * | 2014-09-10 | 2015-01-07 | 合肥精大仪表股份有限公司 | A kind of Three-rotor flow meter |
| CN205642491U (en) * | 2016-05-11 | 2016-10-12 | 浙江裕顺仪表有限公司 | Helical rotor type gas Roots flowmeter |
| CN109026680A (en) * | 2018-08-31 | 2018-12-18 | 浙江工业大学 | A kind of balanced type flexibility combined blade and impeller pump |
| CN208635859U (en) * | 2018-07-17 | 2019-03-22 | 苍仪科技(上海)有限公司 | A kind of three blade volumetric flowmeters |
| CN208887717U (en) * | 2018-10-24 | 2019-05-21 | 温州市八达机械有限公司 | A kind of gas roots flowmeter |
| CN110307078A (en) * | 2019-08-03 | 2019-10-08 | 李松 | Energy conversion device and rotary engine based on fluid displacement variation |
-
2020
- 2020-10-21 CN CN202011134026.7A patent/CN112325951B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2754067Y (en) * | 2004-12-10 | 2006-01-25 | 浙江中亚仪表有限公司 | Three-rotor flow meter |
| DE102007029803A1 (en) * | 2007-06-27 | 2009-01-08 | Müller, Josef | Hydraulic gear has fluid, which is moved with adjustable short turbine blades of turbine, and two parallely arranged blade motor are driven by controlling blade that drives drive wheel |
| CN204085600U (en) * | 2014-09-10 | 2015-01-07 | 合肥精大仪表股份有限公司 | A kind of Three-rotor flow meter |
| CN205642491U (en) * | 2016-05-11 | 2016-10-12 | 浙江裕顺仪表有限公司 | Helical rotor type gas Roots flowmeter |
| CN208635859U (en) * | 2018-07-17 | 2019-03-22 | 苍仪科技(上海)有限公司 | A kind of three blade volumetric flowmeters |
| CN109026680A (en) * | 2018-08-31 | 2018-12-18 | 浙江工业大学 | A kind of balanced type flexibility combined blade and impeller pump |
| CN208887717U (en) * | 2018-10-24 | 2019-05-21 | 温州市八达机械有限公司 | A kind of gas roots flowmeter |
| CN110307078A (en) * | 2019-08-03 | 2019-10-08 | 李松 | Energy conversion device and rotary engine based on fluid displacement variation |
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