CN111811591A - Flow stabilizing and pressure stabilizing signal acquisition structure of nozzle flow meter - Google Patents
Flow stabilizing and pressure stabilizing signal acquisition structure of nozzle flow meter Download PDFInfo
- Publication number
- CN111811591A CN111811591A CN202010803630.8A CN202010803630A CN111811591A CN 111811591 A CN111811591 A CN 111811591A CN 202010803630 A CN202010803630 A CN 202010803630A CN 111811591 A CN111811591 A CN 111811591A
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- stabilizing
- flow
- nozzle
- signal acquisition
- inlet pipe
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- 230000000087 stabilizing effect Effects 0.000 title claims abstract description 62
- 230000007246 mechanism Effects 0.000 claims abstract description 21
- 239000012530 fluid Substances 0.000 claims abstract description 17
- 238000009434 installation Methods 0.000 claims abstract description 11
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 230000001681 protective effect Effects 0.000 claims description 14
- 210000001503 joint Anatomy 0.000 claims description 9
- 230000001154 acute effect Effects 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 5
- 230000006641 stabilisation Effects 0.000 abstract 1
- 238000011105 stabilization Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 11
- 239000007788 liquid Substances 0.000 description 8
- 239000003381 stabilizer Substances 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000001514 detection method Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
- G01F1/36—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 the pressure or differential pressure being created by the use of flow constriction
- G01F1/40—Details of construction of the flow constriction devices
- G01F1/42—Orifices or nozzles
-
- 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
- G01F1/36—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 the pressure or differential pressure being created by the use of flow constriction
-
- 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
- G01F15/14—Casings, e.g. of special material
-
- 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
- G01F15/18—Supports or connecting means for meters
- G01F15/185—Connecting means, e.g. bypass conduits
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention relates to the field of flow meters, in particular to a flow stabilizing and voltage stabilizing signal acquisition structure of a nozzle flow meter, which has a simple structure, is convenient for stabilizing the flow of fluid and improving the accuracy of flow data. The inlet pipe and the outlet pipe are respectively connected from two ends of the pipeline installation through hole; a nozzle penetrating through the second throttle ring is arranged on the first throttle ring; the first throttling ring and the second throttling ring are both provided with a signal acquisition port, and the two signal acquisition ports are connected with a data receiving and processing device arranged on the nozzle main body; and a flow stabilizing mechanism for improving the stability of the fluid is arranged on the inner wall of the inlet pipe. According to the flow stabilizing and pressure stabilizing signal acquisition structure of the nozzle flow meter, when fluid reaches the flow stabilizing plate, the fluid rotates and flows under the action of the flow stabilizing plate, the pressure on the wall of the inlet pipe is uniform and stable, the flow speed and the pressure of the signal acquisition port are stable under the action of the first throttling ring and the second throttling ring, the flow stabilizing and pressure stabilizing signal acquisition structure has the characteristics of simple structure and convenience in fluid flow stabilization, and the accuracy of flow data is improved.
Description
Technical Field
The invention relates to the field of flow meters, in particular to a flow stabilizing and voltage stabilizing signal acquisition structure of a nozzle flow meter, which has a simple structure, is convenient for stabilizing the flow of fluid and improving the accuracy of flow data.
Background
Flow meters, and in particular gas flow meters, are commonly used in everyday life, for example, natural gas meters, which are necessary to calculate the amount of natural gas used by a user. The gas meter commonly used at present measures by detecting the actual flow of gas. In the existing flowmeter, fluid directly passes through a pipeline, and when the flowmeter is detected, the fluid is disturbed due to the existence of a detection mechanism, so that the pressure of the fluid on the pipe wall is unstable, and the data is inaccurate. In addition, the speed of the fluid directly passing through the pipeline is high, and the detection mechanism is greatly impacted, so that the flow velocity and the pressure are unstable.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a flow stabilizing and voltage stabilizing signal acquisition structure of a nozzle flow meter, which has a simple structure, is convenient for stabilizing the flow of fluid and improving the accuracy of flow data.
The technical scheme adopted by the invention is as follows: the flow-stabilizing and pressure-stabilizing signal acquisition structure of the nozzle flow meter comprises a nozzle main body, an inlet pipe and an outlet pipe, wherein a pipeline installation through hole is formed in the nozzle main body, and the inlet pipe and the outlet pipe are respectively connected from two ends of the pipeline installation through hole; a nozzle mechanism matched with the butt joint position of the inlet pipe and the outlet pipe is matched in the pipeline mounting through hole; the nozzle mechanism comprises a first throttling ring arranged at the butt joint end of the inlet pipe and a second throttling ring arranged at the butt joint end of the outlet pipe, and a nozzle penetrating through the second throttling ring is arranged on the first throttling ring; the first throttling ring and the second throttling ring are both provided with a signal acquisition port, and the two signal acquisition ports are connected with a data receiving and processing device arranged on the nozzle main body; and a flow stabilizing mechanism for improving the stability of the fluid is arranged on the inner wall of the inlet pipe.
In order to better realize the invention, the three flow stabilizing mechanisms are uniformly arranged along the circumferential direction of the inner wall of the inlet pipe.
In order to better realize the invention, the plane of the flow stabilizing plate is vertical to the inner wall of the inlet pipe, and the included angle between the plane of the flow stabilizing plate and the cross section of the inlet pipe is an acute angle alpha which is more than or equal to 15 degrees and less than or equal to 45 degrees.
In order to better realize the invention, the included angle between the plane of the flow stabilizing plate and the cross section of the inlet pipe is an acute angle alpha, and alpha is 25 degrees.
In order to better realize the invention, the flow stabilizing plate is in a fan shape with a long root and a short top.
In order to better realize the invention, the invention also comprises a protective shell, and the protective shell is clamped and matched with the nozzle main body; the data receiving and processing device is arranged in the protective shell and matched with the signal acquisition port, the data receiving and processing device is matched with an external data interface, and an opening for the external data interface to extend out conveniently is formed in the protective shell.
In order to better realize the invention, the inlet pipe and the outlet pipe are both provided with outer threads, and the pipeline mounting through hole is internally provided with inner threads matched with the outer threads.
In order to better realize the invention, a rubber sealing ring is matched at the signal acquisition opening.
The invention has the beneficial effects that: according to the flow stabilizing and pressure stabilizing signal acquisition structure of the nozzle flow meter, through the matching of the nozzle main body, the inlet pipe, the outlet pipe, the installation through hole, the nozzle mechanism, the first throttle ring, the second throttle ring, the signal acquisition port, the data receiving and processing device, the flow stabilizing mechanism and the like, when gas or liquid reaches the flow stabilizing plate, the gas or liquid flows in a rotating mode under the action of the flow stabilizing plate, the pressure on the pipe wall of the inlet pipe is uniform and stable, when the gas or liquid reaches the nozzle mechanism consisting of the first throttle ring and the second throttle ring, the flow speed and the pressure of the signal acquisition port are stable under the action of the first throttle ring and the second throttle ring, the flow stabilizing and pressure stabilizing signal acquisition structure has the advantages of being simple in structure and convenient for fluid flow.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a schematic diagram of an explosion structure of a flow stabilizing and pressure stabilizing signal acquisition structure of a nozzle flow meter according to the present invention;
FIG. 2 is a schematic structural view of a flow stabilizing and pressure stabilizing signal acquisition structure of a nozzle flow meter according to the present invention;
FIG. 3 is a schematic view of a configuration of inlet and outlet tube combinations of a flow stabilizing and voltage stabilizing signal acquisition configuration of a nozzle flow meter in accordance with the present invention;
in the figure, 1-nozzle body, 2-pipeline installation through hole, 3-inlet pipe, 4-outlet pipe, 5-external screw thread, 6-internal screw thread, 10-external data interface, 11-protective shell, 12-opening, 13-first throttling ring, 14-second throttling ring, 15-nozzle, 16-signal acquisition port, 18-flow stabilizer and 21-rubber sealing ring.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
Example 1:
as shown in fig. 1 to 3, the structure for collecting a flow-stabilizing and pressure-stabilizing signal of a nozzle flow meter of the present invention includes a nozzle body 1, an inlet pipe 3 and an outlet pipe 4, wherein the nozzle body 1 is provided with a pipeline installation through hole 2, and the inlet pipe 3 and the outlet pipe 4 are respectively connected from two ends of the pipeline installation through hole 2; a nozzle mechanism matched with the butt joint position of the inlet pipe 3 and the outlet pipe 4 is matched in the pipeline mounting through hole 2; the nozzle mechanism comprises a first throttling ring 13 arranged at the butt joint end of the inlet pipe 3 and a second throttling ring 14 arranged at the butt joint end of the outlet pipe 4, and a nozzle 15 penetrating through the second throttling ring 14 is arranged on the first throttling ring 13; the first throttling ring 13 and the second throttling ring 14 are both provided with a signal acquisition port 16, and the two signal acquisition ports 16 are connected with a data receiving and processing device arranged on the nozzle body 1; and a flow stabilizing mechanism for improving the stability of the fluid is arranged on the inner wall of the inlet pipe 3. According to the flow stabilizing and pressure stabilizing signal acquisition structure of the nozzle flow meter, through the matching of the nozzle main body 1, the inlet pipe 3, the outlet pipe 4, the mounting through hole 2, the nozzle mechanism, the first throttle ring 13, the second throttle ring 14, the signal acquisition port 16, the data receiving and processing device, the flow stabilizing mechanism and the like, when gas or liquid (fluid) reaches the flow stabilizing plate, the gas or liquid rotates and flows under the action of the flow stabilizing plate, the pressure on the pipe wall of the inlet pipe is uniform and stable, when the gas or liquid (fluid) reaches the nozzle mechanism consisting of the first throttle ring 13 and the second throttle ring 14, the flow speed and the pressure of the signal acquisition port 16 are stable under the action of the first throttle ring 13 and the second throttle ring 14, the flow stabilizing and pressure stabilizing signal acquisition structure has the characteristics of being simple in structure and facilitating the flow.
Example 2:
on the basis of the above embodiment, in order to further better implement the present invention, the flow stabilizing mechanism is provided with three flow stabilizing plates 18, and the three flow stabilizing plates 18 are uniformly arranged along the circumferential direction of the inner wall of the inlet pipe 3.
Example 2:
on the basis of the above embodiment, in order to further better implement the present invention, the plane of the flow stabilizing plate 18 is perpendicular to the inner wall of the inlet pipe 3, and the included angle between the plane of the flow stabilizing plate 18 and the cross section of the inlet pipe 3 is an acute angle α, which satisfies that α is greater than or equal to 15 ° and less than or equal to 45 °. With such a design, when the gas or liquid reaches the stabilizing plate 18, the rotating flow is counterclockwise or clockwise along the direction of the stabilizing plate 18, and the pressure on the wall of the inlet pipe 3 is uniform. Preferably, the plane of the flow stabilizer 18 forms an acute angle α with the cross section of the inlet tube 3, where α is 25 °. Further, the plane of the flow stabilizer 18 forms an acute angle α with the cross section of the inlet tube 3, and α is 30 °.
Preferably, the flow stabilizer 18 is in a fan shape with a long root and a short top, so that the design facilitates stable flow of gas or liquid, reduces shaking of the flow stabilizer 18, has good mechanical stability, and can conveniently detect accurate data.
Example 3:
on the basis of the above embodiment, in order to further better implement the present invention, the present invention further comprises a protective casing 11, wherein the protective casing 1 is in clamping fit with the nozzle main body 1; the data receiving and processing device is arranged in the protective shell 11 and is matched with the signal acquisition port 16, the data receiving and processing device is matched with the external data interface 10, and an opening 12 for the external data interface 10 to extend out conveniently is formed in the protective shell 1. The electronic components of the data receiving and processing device can be well protected by the protective shell 1. Preferably, the protective casing 1 is made of a corrosion-resistant material, such as POM material.
Example 4:
in addition to the above-mentioned embodiments, in order to further and better implement the present invention, the inlet pipe 3 and the outlet pipe 4 are provided with the outer screw thread 5, and the pipe installation through hole 2 is provided with the inner screw thread 6 engaged with the outer screw thread 5. Through the cooperation of outer screw thread 5 and interior screw thread 6, can conveniently stably install inlet pipe 3 and outlet pipe 4, and keep connecting stably, can conveniently detect accurate data.
Example 5:
on the basis of the above embodiment, in order to further better implement the present invention, the signal acquisition port 16 is matched with a rubber sealing ring, which has a better sealing performance and can conveniently detect accurate data.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (8)
1. The structure for collecting the flow-stabilizing and pressure-stabilizing signals of the nozzle flowmeter is characterized in that: the nozzle comprises a nozzle body (1), an inlet pipe (3) and an outlet pipe (4), wherein a pipeline installation through hole (2) is formed in the nozzle body (1), and the inlet pipe (3) and the outlet pipe (4) are respectively connected from two ends of the pipeline installation through hole (2); a nozzle mechanism matched with the butt joint position of the inlet pipe (3) and the outlet pipe (4) is matched in the pipeline mounting through hole (2); the nozzle mechanism comprises a first throttling ring (13) arranged at the butt joint end of the inlet pipe (3) and a second throttling ring (14) arranged at the butt joint end of the outlet pipe (4), and a nozzle (15) penetrating through the second throttling ring (14) is arranged on the first throttling ring (13); the first throttling ring (13) and the second throttling ring (14) are respectively provided with a signal acquisition port (16), and the two signal acquisition ports (16) are connected with a data receiving and processing device arranged on the nozzle main body (1); and a flow stabilizing mechanism for improving the stability of the fluid is arranged on the inner wall of the inlet pipe (3).
2. The flow-stabilizing and pressure-stabilizing signal acquisition structure of the nozzle flow meter according to claim 1, characterized in that: the flow stabilizing mechanisms are three flow stabilizing plates (18), and the three flow stabilizing plates (18) are uniformly arranged along the circumferential direction of the inner wall of the inlet pipe (3).
3. The flow-stabilizing and pressure-stabilizing signal acquisition structure of the nozzle flow meter according to claim 2, characterized in that: the plane where the flow stabilizing plates (18) are located is perpendicular to the inner wall of the inlet pipe (3), and an included angle formed by the plane where the flow stabilizing plates (18) are located and the cross section of the inlet pipe (3) is an acute angle alpha, and alpha is more than or equal to 15 degrees and less than or equal to 45 degrees.
4. The flow-stabilizing and pressure-stabilizing signal acquisition structure of the nozzle flow meter according to claim 3, characterized in that: the included angle between the plane where the flow stabilizing plate (18) is located and the cross section of the inlet pipe (3) is an acute angle alpha, and alpha is 25 degrees.
5. The flow-stabilizing and pressure-stabilizing signal acquisition structure of the nozzle flow meter according to claim 4, characterized in that: the flow stabilizing plate (18) is in a fan shape with a long root and a short top.
6. The flow-stabilizing and pressure-stabilizing signal acquisition structure of the nozzle flow meter according to claim 5, characterized in that: the nozzle is characterized by also comprising a protective shell (11), wherein the protective shell (1) is in clamping fit with the nozzle main body (1); the data receiving and processing device is arranged in the protective shell (11) and matched with the signal acquisition port (16), the data receiving and processing device is matched with the external data interface (10), and an opening (12) which is convenient for the external data interface (10) to extend out is formed in the protective shell (1).
7. The flow-stabilizing and pressure-stabilizing signal acquisition structure of the nozzle flow meter according to claim 6, characterized in that: outer threads (5) are arranged on the inlet pipe (3) and the outlet pipe (4), and inner threads (6) matched with the outer threads (5) are arranged in the pipeline installation through holes (2).
8. The flow-stabilizing and pressure-stabilizing signal acquisition structure of the nozzle flow meter according to claim 7, characterized in that: and a rubber sealing ring is matched at the signal acquisition port (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010803630.8A CN111811591A (en) | 2020-08-11 | 2020-08-11 | Flow stabilizing and pressure stabilizing signal acquisition structure of nozzle flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010803630.8A CN111811591A (en) | 2020-08-11 | 2020-08-11 | Flow stabilizing and pressure stabilizing signal acquisition structure of nozzle flow meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111811591A true CN111811591A (en) | 2020-10-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010803630.8A Pending CN111811591A (en) | 2020-08-11 | 2020-08-11 | Flow stabilizing and pressure stabilizing signal acquisition structure of nozzle flow meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111811591A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06241858A (en) * | 1993-02-15 | 1994-09-02 | Oval Corp | Straightening apparatus |
| CN203672417U (en) * | 2013-12-13 | 2014-06-25 | 宁波东海仪表水道有限公司 | Fluid director of water metering device |
| EP2759806A1 (en) * | 2013-01-29 | 2014-07-30 | Itron France | Ultrasonic flow meter |
| CN204301800U (en) * | 2014-12-25 | 2015-04-29 | 重庆市伟岸测器制造股份有限公司 | For the rectifier in water meter |
| KR101634376B1 (en) * | 2014-12-15 | 2016-06-28 | 한국항공우주연구원 | Flow conditioner |
| CN205748497U (en) * | 2016-01-15 | 2016-11-30 | 江苏华海测控技术有限公司 | Multi-nozzle balance flowmeter |
| CN107806913A (en) * | 2017-10-30 | 2018-03-16 | 成都瞬科仪器仪表有限公司 | Gas pipeline plurality of nozzle-type flow measuring probe |
| CN208476326U (en) * | 2018-07-09 | 2019-02-05 | 玉环池氏阀门有限公司 | A kind of impeller current stabilization piece on valve ultrasonic water meter |
| CN109696213A (en) * | 2018-11-27 | 2019-04-30 | 西人马(西安)测控科技有限公司 | A kind of domestic gas meter |
| CN212275002U (en) * | 2020-08-11 | 2021-01-01 | 苏州昇萨特传感技术有限公司 | Flow stabilizing and pressure stabilizing signal acquisition structure of nozzle flow meter |
-
2020
- 2020-08-11 CN CN202010803630.8A patent/CN111811591A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06241858A (en) * | 1993-02-15 | 1994-09-02 | Oval Corp | Straightening apparatus |
| EP2759806A1 (en) * | 2013-01-29 | 2014-07-30 | Itron France | Ultrasonic flow meter |
| CN203672417U (en) * | 2013-12-13 | 2014-06-25 | 宁波东海仪表水道有限公司 | Fluid director of water metering device |
| KR101634376B1 (en) * | 2014-12-15 | 2016-06-28 | 한국항공우주연구원 | Flow conditioner |
| CN204301800U (en) * | 2014-12-25 | 2015-04-29 | 重庆市伟岸测器制造股份有限公司 | For the rectifier in water meter |
| CN205748497U (en) * | 2016-01-15 | 2016-11-30 | 江苏华海测控技术有限公司 | Multi-nozzle balance flowmeter |
| CN107806913A (en) * | 2017-10-30 | 2018-03-16 | 成都瞬科仪器仪表有限公司 | Gas pipeline plurality of nozzle-type flow measuring probe |
| CN208476326U (en) * | 2018-07-09 | 2019-02-05 | 玉环池氏阀门有限公司 | A kind of impeller current stabilization piece on valve ultrasonic water meter |
| CN109696213A (en) * | 2018-11-27 | 2019-04-30 | 西人马(西安)测控科技有限公司 | A kind of domestic gas meter |
| CN212275002U (en) * | 2020-08-11 | 2021-01-01 | 苏州昇萨特传感技术有限公司 | Flow stabilizing and pressure stabilizing signal acquisition structure of nozzle flow meter |
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