CN105403264B - Runner in ultrasonic flowmeter - Google Patents
Runner in ultrasonic flowmeter Download PDFInfo
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- CN105403264B CN105403264B CN201510770038.1A CN201510770038A CN105403264B CN 105403264 B CN105403264 B CN 105403264B CN 201510770038 A CN201510770038 A CN 201510770038A CN 105403264 B CN105403264 B CN 105403264B
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Abstract
A kind of runner in ultrasonic flowmeter, including runner ontology, runner ontology is made of supporing shell and ventilation casing two parts, it bonds together in the through slot of ventilation casing insertion supporing shell and by bonding agent and supporing shell, one end of ventilation casing is connected with vertical shell by arc coupling part, it was provided with gas channel in ventilation casing and vertical shell, ultrasonic transducer is installed in supporing shell, fixed mechanism is provided in supporing shell.The present invention has the advantage that it can make fluid cross in gas channel the flow regime for remaining even, it avoids impurity or moisture content in combustion gas and is stockpiled in gas passage and signal acquisition is impacted, keep the acquisition of flow signal more acurrate, improve the precision of gas meter, flow meter metering, reduce crushing, ultrasonic transducer can also be eliminated to interfere in the solid generated between installation hole wall in signal acquisition process, supporing shell right and left mutually changing position is facilitated to install.
Description
Technical field
The present invention relates to a kind of fluid flows to measure field, the component in especially a kind of ultrasonic flowmeter.
Background technique
Flowmeter is a kind of instrument for measuring fluid flow in pipeline or open channel, such as the combustion for gas flow metering
Gas meter, general common gas meter, flow meter have diaphragm gas meter, and diaphragm gas meter turns straight reciprocating motion by internal mechanical structure
Become circular motion, then machinery is driven by circular motionIdler wheelCounter rotation, diaphragm often make a round trip, are just discharged a certain amount of
Gas, final idler wheel turn over a technical unit, realize idler wheel rotary metering display effect.Diaphragm gas meter is divided into mechanically again
Diaphragm gas meter andPre-paymentDiaphragm gas meter,Pre-paymentDiaphragm gas meter is to improve to get on the basis of tradition machinery formula
, increase electronic measurement mode, pre-payment and display function on the basis of original.Due to the composition of the combustion gas of different regions, combustion
The content of the water content and granule foreign carried secretly in gas can all have biggish difference, cause stem-winder to combustion gas stream in this way
When amount is measured, the moisture in combustion gas can make gear and other Rust of metal structures in stem-winder；Particle in combustion gas
Impurity or moisture content can be adsorbed on diaphragm, influence the working condition of diaphragm, be easy to cause gas meter, flow meter measuring accuracy poor；In combustion gas also
Have hydrogen sulfide, carbon dioxide, nitrogen and aqueous vapor and a micro inert gas containing a small amount of, these gases it is long-term pass through machinery
In table, the structure in stem-winder can occur slowly to corrode；Although being equipped with filter etc. in stem-winder, can prevent in combustion gas
A certain amount of solid particle enters in table, but the solid particle in combustion gas is easy to make plugged filter, and ventilation is caused to have some setbacks
Freely, there is the situation of metering inaccuracy, or even can not measure.If desired the filter in clean gas, it is necessary to professional
It is operated, practical operation difficulty is very big.
Summary of the invention
The object of the present invention is to provide the runners in a kind of structure novel, ultrasonic flowmeter easy to assembly, it is not only
Fluid can be made to cross in gas channel the flow regime for remaining even, keep the acquisition of flow signal more acurrate, may be used also
To avoid in combustion gas impurity or moisture content stockpiled in gas passage, be further ensured that the accuracy of the acquisition of flow signal, make
When on gas meter, flow meter, the precision of metering is improved.
The purpose of the present invention is what is be implemented with the following technical solutions, it includes runner ontology, and runner ontology is by supporting shell
Body and ventilation casing two parts composition, wherein supporing shell is cuboid, supporing shell be provided with cross section be square it is logical
Slot, the shape of ventilation casing are matched with the inner wall of through slot, in the through slot of ventilation casing insertion supporing shell and pass through bonding agent
It bonds together with supporing shell, and the both ends of ventilation casing are respectively positioned on except supporing shell, one end of ventilation casing passes through arc
Shape coupling part is connected with vertical shell, and gas channel was provided in ventilation casing and vertical shell, crosses the import in gas channel
Positioned at the other end face of ventilation casing, the outlet for crossing gas channel is located at the lower end surface of vertical shell, pacifies in supporing shell
Equipped with the ultrasonic transducer that can acquire the fluid flow passed through in gas channel, supporting shell can be made by being provided in supporing shell
Body can also install the fixed mechanism of positioning after left and right exchange.
The present invention, which need to be mounted on flowmeter shell, carries out metering use, and being such as mounted on upper and lower casing is split type combustion
In gas meter, upper and lower casing is quadrangle, and lower case is arranged air-flow buffer chamber, and by partition by air-flow buffer chamber be separated into it is left,
Right two symmetrical chambers, the top of partition are arranged U-shaped card slot, are provided on upper housing and communicate with the left chamber in lower case
Inlet plenum and the discharge chamber that is communicated with the right chamber in lower casing sheet.When installation, runner ontology is pacified by fixed mechanism level
On upper housing, then during closing upper and lower casing, runner ontology should be stuck in the U-shaped card slot in lower case, runner ontology water
The flat air-flow buffer positioned at lower case is intracavitary, and the inducer for crossing gas channel is then located at the left chamber of lower case, crosses gas channel
Outlet section is located at the right chamber of lower case and the outlet is towards the bottom of lower case, and the import in gas channel was made mutually to hang down with inlet plenum
Directly, the outlet in gas channel and the outlet of discharge chamber are crossed towards on the contrary, being finally fixed to one another between upper and lower casing to form ultrasound
Wave gas meter, flow meter acquired gas flow signals in gas channel by ultrasonic transducer in gas metering, and the signal of acquisition is passed
It is handed in the control circuit on gas meter, flow meter, display will be reached after the signal processing by control circuit and shown.Due to runner
Ontology is horizontally disposed in air-flow buffer chamber, kept the import and export in gas channel not opposite with the inlet, outlet of gas meter, flow meter, and can keep away
Exempt from gas rapid flow in gas meter, flow meter, i.e., after rapid flow refers to that the gas of gas meter, flow meter air inlet was directly entered in gas channel
The gas outlet of gas meter, flow meter is sent directly by the outlet for crossing gas channel again, but in gas meter, flow meter held stationary after rectifying gas buffer
Uniform flowing, keeps the acquisition of flow signal more acurrate, the moisture in impurity or table in gas can also be prevented to be directly entered
It crosses in gas channel, guarantees stationarity and accuracy that ultrasonic transducer acquires gas flow signals, guarantee the meter of gas meter, flow meter
Accuracy of measurement.Even if there is subtleer impurity to enter gas channel in gas flow, in gas flow, also facilitate
Impurity is discharged by the outlet for crossing gas channel, avoids impurity from being accumulated in gas channel and shadow is caused to the signal collection of gas flow
It rings.
By adopting the above-described technical solution, the present invention has the advantage that
(1), it can make fluid cross in gas channel the flow regime for remaining even, make adopting for flow signal
Collect more acurrate；
(2), it impurity or moisture content in combustion gas is avoided is stockpiled in gas passage and signal acquisition is impacted, further
The accuracy for guaranteeing the acquisition of flow signal improves the precision of gas meter, flow meter metering；
(3), it reduces the flow velocity of outlet side by the flow velocity of increase inlet end, reduces crushing；
(4), it is dry in the solid generated between installation hole wall in signal acquisition process that ultrasonic transducer can also be eliminated
It disturbs, it is therefore prevented that ultrasonic wave carries out solid propagation by supporing shell, and ultrasonic transducer is made more accurately to obtain gas in runner
In propagation useful signal, accurate measurement can just be made by only obtaining useful signal；
(5), facilitate supporing shell right and left mutually changing position to install, increase the convenience used.
Detailed description of the invention
Detailed description of the invention of the invention is as follows.
Fig. 1 is structural schematic diagram of the invention.
Fig. 2 is the cross-sectional view of A-A in Fig. 1.
Fig. 3 is the cross-sectional view of B-B in Fig. 1.
Fig. 4 is the structural schematic diagram that the present invention is mounted in gas meter, flow meter.
Fig. 5 is the structural schematic diagram of ventilation casing in the present invention.
Fig. 6 is the structural schematic diagram of vertical shell in the present invention.
Fig. 7 is the cross-sectional view of Fig. 6.
Specific embodiment
In order to make the present invention realize technological means, creation characteristic, reach purpose and effect more clearly and be apparent to,
The present invention is further elaborated with reference to the accompanying drawings and detailed description:
As shown in Figure 1-3, the present invention has runner ontology 1, runner ontology 1 is by 3 two parts of supporing shell 2 and ventilation casing
Composition, wherein supporing shell 2 is cuboid, and supporing shell 2 is provided with the through slot that cross section is square, ventilation casing 3 it is outer
Shape is matched with the inner wall of through slot, and ventilation casing 3 is inserted into the through slot of supporing shell 2 and is glued by bonding agent and supporing shell 2
It is connected together, and the both ends of ventilation casing 3 are respectively positioned on except supporing shell 2, one end of ventilation casing 3 passes through arc coupling part
4 are connected with vertical shell 5, are provided with gas channel 6 in ventilation casing 3 and vertical shell 5, the import for crossing gas channel 6 is located at
The other end face of ventilation casing 3, the outlet for crossing gas channel 6 are located at the lower end surface of vertical shell 5, pacify in supporing shell 2
Equipped with the ultrasonic transducer 7 that can acquire the fluid flow passed through in gas channel, being provided in supporing shell 2 can make to support
Shell 2 can also install the fixed mechanism of positioning after left and right exchange.
The present invention, which need to be mounted on flowmeter shell, carries out metering use, and being such as mounted on upper and lower casing is split type combustion
In gas meter, upper and lower casing 19,20 is quadrangle, and referring to attached drawing 4, lower case 20 is arranged air-flow buffer chamber, and by partition by gas
Stream cushion chamber is separated into left and right two symmetrical chambers, and U-shaped card slot is arranged in the top of partition, be provided on upper housing 19 with
The inlet plenum that left chamber in lower case 20 communicates and the discharge chamber communicated with the right chamber in lower casing sheet.When installation, by runner
Ontology is horizontally arranged on upper housing by fixed mechanism, then during closing upper and lower casing, runner ontology 1 should be stuck in lower case
On U-shaped card slot in, the horizontal air-flow buffer positioned at lower case of runner ontology 1 is intracavitary, and the inducer in mistake gas channel is then located at
The left chamber of lower case crosses the outlet section right chamber that is located at lower case in gas channel and the outlet towards the bottom of lower case, makes
Import and the inlet plenum for crossing gas channel are perpendicular, cross the outlet in gas channel and the outlet of discharge chamber towards on the contrary, finally will be upper and lower
It is fixed to one another between shell to form ultrasonic wave gas meter, in gas metering, was acquired in gas channel by ultrasonic transducer
The signal of acquisition is transferred in the control circuit on gas meter, flow meter by gas flow signals, will be after the signal processing by control circuit
Display is reached to be shown.Since runner ontology 1 is horizontally disposed in air-flow buffer chamber, made the import and export in gas channel 6 not with
The inlet, outlet of gas meter, flow meter is opposite, can rapid flow, i.e. rapid flow refer to gas meter, flow meter air inlet in gas meter, flow meter to avoid gas
The gas of mouth was sent directly into the gas outlet of gas meter, flow meter by the outlet for crossing gas channel again after being directly entered in gas channel, but made gas
It is uniformly flowed after body buffering rectification in gas meter, flow meter held stationary, keeps the acquisition of flow signal more acurrate, gas can also be prevented
In impurity or table in moisture be directly entered in gas channel, guarantee ultrasonic transducer gas flow signals acquisition is put down
Stability and accuracy guarantee the measuring accuracy of gas meter, flow meter.Even if there is subtleer impurity to enter gas in gas flow
Channel also facilitates and impurity is discharged by the outlet for crossing gas channel, impurity is avoided to be accumulated in gas channel in gas flow
The interior signal collection to gas flow impacts.
As shown in Figs. 1-2, location sealing plate 8 is provided in the middle part of the bottom surface of supporing shell 2, before supporing shell 2,
Be provided with vertical side sealing plate 9 on the middle part of latter two side, the both ends of location sealing plate 8 respectively with former and later two sides
On side sealing plate 9 bottom connection in one, the top surface of the side sealing plate 9 on former and later two sides with supporing shell 2
Either flush.
After the supporing shell 2 is supported on the U-shaped card slot in lower case 20, it is located at location sealing plate 8 and side sealing plate 9 and sets
Set in the seal groove of U-shaped card slot cell wall, realize assembly after, the left and right chamber of lower case is completely independent, only by cross gas channel will under
Shell left and right chamber connection is logical, can prevent the indoor measured gas of the left chamber of lower case and right chamber is indoor has measured gas
Body is arbitrarily mutually gone here and there, and guarantees fair trading.Location sealing plate 8 and side sealing plate 9 are located at the middle part of supporing shell 2, facilitate supporting shell
After body 2 is exchanged in left and right position, it can also correspond to and be placed in U-shaped card slot, increase the interchangeability used.
As shown in Fig. 2, the leading flank in supporing shell 2 is arranged there are two the preceding process area 10 for being in rods arranged in horizontal line, propping up
The trailing flank setting of shell 2 is supportted there are two the rear process area 11 for being in rods arranged in horizontal line, technique after two preceding process areas 10 and two
Either flush of the top surface of platform 11 with supporing shell 2, in two preceding process areas 10, at wherein one before side sealing plate
It is provided with fixation hole 12 on process area, location hole 13 is provided on another preceding process area, after two in process area, wherein one
Fixation hole is set on the rear process area of a close side sealing plate, is provided with location hole on another preceding process area and forms fixed machine
Structure.
When normal use is assembled, former and later two location holes in supporing shell 2 are directly sleeved on two groups pairs of upper housing setting
The positioning pin answered, just makes in supporing shell that former and later two fixation holes are corresponding with two groups of connections on upper housing, so that it may pass through screw
Supporing shell is fixed on upper housing.Due to the fixation hole of front and back in supporing shell 2 and positioning hole location symmetric relation, even if
It is also capable of fixing when the inlet and outlet tuning installation of supporing shell 2, realizes the exchange of supporing shell installation site.
As illustrated in figs. 5-7, vertical shell 5 is buckled in the lower end of arc coupling part 4, and vertical shell 5 is square, two broadsides
Inner sidewall phase on the outside of inclination, the angle of the inner sidewall of vertical shell broadside and two broadside lines is 73.5 °~83.5 °.Vertically
5 liang of broadsides of shell keep the gas outlet of vertical shell 5 in the shape of a trumpet using skewed, keep the air-flow of outlet gentle and balance, subtract
Lacked the crushing of gas channel 6 inlet end and outlet side, the angle of skewed angle a can for 73.5 °, 75.5 °, 77.5 °,
78.5 °, 80.5 ° or 82 ° etc., it can according to need the skewed angle a of setting.
As illustrated in figs. 5-7, the upper end of the two opposite side walls of vertical shell 5 is provided with bayonet 21, in arc coupling part 4
Lower end be provided with the chuck 22 matched with bayonet 21, be buckled in bayonet by chuck and vertical shell 5 be buckled in arc
On coupling part 4.Vertical shell is linked together by the way of clamping with arc coupling part, can be convenient assembly, is connected
Fast and easy.
As shown in Figure 1, being provided with the limiting stand 14 that can be against 2 end of supporing shell on ventilation casing 3, limiting stand 14 is leaned on
Nearly arc coupling part 4.The position that ventilation casing enters in supporing shell 2 can be placed restrictions on by limiting stand 14, guarantees whole knot
The use reliability of structure.
As shown in Figure 1, 2, it is provided with mounting hole 15 in the forward and backward side of supporing shell 2, in the forward and backward side of ventilation casing
Face is installed with the flow collection mouth 16 communicated with mounting hole, communicates mounting hole 15 with the gas channel of crossing in ventilation casing 3,
Ultrasonic transducer 7 is pairs of to be mounted in the mounting hole of forward and backward side of supporing shell 2, the axial connecting line of two mounting holes 15
Center line with 3 both ends of ventilation casing is in 20 °~65 ° angles.It can be convenient installation ultrasonic transducer 7 by above structure,
The axial connecting line of two mounting holes 15 and the center line at 3 both ends of ventilation casing are in 20 °~65 ° angles, tilt ultrasonic transducer 7
Position increases the sound path of ultrasonic transducer, guarantees measuring accuracy.
As shown in Fig. 2, being provided with vibrationproof gum cover 17 in the contact site of ultrasonic transducer 7 and inner wall of the hole installing.Vibrationproof
Gum cover 17 can reduce or eliminate the solid between probe and supporing shell 2 and interferes, and prevent ultrasonic wave from carrying out solid biography by runner
It broadcasts, can more be accurately obtained gas in the signal for the propagation crossed in gas channel, standard could be measured by only obtaining useful signal
Really.
As shown in figure 3, the entrance for crossing gas channel 6 is provided with inner chamfer.Cross the chamfering of the import in gas channel 6, Ke Yijin
The smooth gas of one step, facilitates the flow velocity for increasing the inlet end in gas channel 6, and the outlet in gas channel 6 excessively may also set up downward
Chamfering, downward chamfering, which can facilitate, to be discharged into the impurity crossed in gas channel 6 or moisture in lower casing body cavity and deposits.
As shown in figure 3, being provided with cable-through hole 18 on the location sealing plate 8 of 2 bottom surface of supporing shell.Cable-through hole 18 can be square
Just in gas meter, flow meter signal wire arrangement.Stiffener plate can also be set in 2 bottom surface of supporing shell, with proof strength.
In conclusion horizontal cowling panel can be arranged crossing in gas channel 6 in the present invention, the quantity of cowling panel can be one
Block, two pieces, three pieces or five pieces are arrangement parallel up and down between every piece when cowling panel is muti-piece, can be right by cowling panel
The gas for crossing gas channel 6 is rectified, and so that the gas for flowing through gas channel 6 is formed the flow field of stable and uniform, with convenience for ultrasonic wave
Sensor acquires more accurate flow signal.
Claims (7)
1. the runner in a kind of ultrasonic flowmeter, including runner ontology (1), it is characterised in that: runner ontology (1) is by supporting shell
Body (2) and ventilation casing (3) two parts composition, wherein supporing shell (2) is cuboid, and supporing shell (2) is provided with transversal
The shape of the through slot that face is square, ventilation casing (3) is matched with the inner wall of through slot, and ventilation casing (3) is inserted into supporing shell (2)
Through slot in and bonded together with supporing shell (2) by bonding agent, and the both ends of ventilation casing (3) are respectively positioned on supporing shell
(2) except, one end of ventilation casing (3) is connected with vertical shell (5) by arc coupling part (4), in ventilation casing (3) and
It being provided with gas channel (6) in vertical shell (5), the import for crossing gas channel (6) is located at the other end face of ventilation casing (3),
The outlet for crossing gas channel (6) is located at the lower end surface of vertical shell (5), is equipped with to acquire on supporing shell (2) and pass through
The ultrasonic transducer (7) of fluid flow in gas channel, be provided on supporing shell (2) can make supporing shell (2) it is left,
The fixed mechanism of positioning can be also installed after right exchange；Mounting hole (15) are provided in the forward and backward side of supporing shell (2),
The forward and backward side of ventilation casing is installed with the flow collection mouth (16) communicated with mounting hole, makes mounting hole (15) and ventilation shell
Gas channel of crossing in body (3) communicates, the installation of the pairs of forward and backward side for being mounted on supporing shell (2) of ultrasonic transducer (7)
In hole, the axial connecting line of two mounting holes (15) and the center line at ventilation casing (3) both ends are in 20 °~65 ° angles；
The runner is mounted between detachable upper housing, lower case, and the import for crossing flow channel is located at the left chamber of lower case,
Cross the right chamber that gas channel outlet is located at lower case；
Location sealing plate (8) are provided in the middle part of the bottom surface of supporing shell (2), in former and later two sides of supporing shell (2)
Middle part on be provided with vertical side sealing plate (9), the both ends of location sealing plate (8) respectively with the side on former and later two sides
The bottom connection of sealing plate (9) in one, the top surface of the side sealing plate (9) on former and later two sides with supporing shell (2)
Either flush；It is in the preceding process area (10) of rods arranged in horizontal line there are two being arranged in the leading flank of supporing shell (2), in supporing shell
(2) trailing flank setting is there are two the rear process area (11) for being in rods arranged in horizontal line, technique after two preceding process areas (10) and two
Either flush of the top surface of platform (11) with supporing shell (2), in two preceding process areas (10), one is leaned on proximal seal wherein
It is provided with fixation hole (12) on the preceding process area of plate, is provided on another preceding process area location hole (13), process area after two
In, fixation hole is set on the wherein one rear process area close to side sealing plate, is provided with location hole on another preceding process area
Form fixed mechanism.
2. the runner in ultrasonic flowmeter as described in claim 1, it is characterised in that: vertical shell (5) is buckled in arc
The lower end of coupling part (4), vertical shell (5) are square, inclination on the outside of the inner sidewall phase of two broadsides, vertical shell broadside it is interior
The angle of side wall and two broadside lines is 73.5 °~83.5 °.
3. the runner in ultrasonic flowmeter as claimed in claim 2, it is characterised in that: two in vertical shell (5) are opposite
The upper end of side wall is provided with bayonet (21), and the chuck matched with bayonet (21) is provided in the lower end of arc coupling part (4)
(22), it is buckled in bayonet by chuck and vertical shell (5) is buckled on arc coupling part (4).
4. the runner in ultrasonic flowmeter as claimed in claim 1,2 or 3, it is characterised in that: set on ventilation casing (3)
It is equipped with the limiting stand (14) that can be against supporing shell (2) end, limiting stand (14) is close to arc coupling part (4).
5. the runner in ultrasonic flowmeter as described in claim 1, it is characterised in that: in ultrasonic transducer (7) and peace
The contact site of dress hole inner wall is provided with vibrationproof gum cover (17).
6. the runner in ultrasonic flowmeter as claimed in claim 5, it is characterised in that: the entrance for crossing gas channel (6) is set
It is equipped with inner chamfer.
7. the runner in ultrasonic flowmeter as claimed in claim 6, it is characterised in that: in determining for supporing shell (2) bottom surface
Cable-through hole (18) are provided on position sealing plate (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510770038.1A CN105403264B (en) | 2015-11-12 | 2015-11-12 | Runner in ultrasonic flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510770038.1A CN105403264B (en) | 2015-11-12 | 2015-11-12 | Runner in ultrasonic flowmeter |
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| Publication Number | Publication Date |
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| CN105403264A CN105403264A (en) | 2016-03-16 |
| CN105403264B true CN105403264B (en) | 2019-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510770038.1A Active CN105403264B (en) | 2015-11-12 | 2015-11-12 | Runner in ultrasonic flowmeter |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108051040B (en) * | 2017-12-11 | 2024-06-11 | 金卡智能集团股份有限公司 | Metering module assembly of electronic meter and electronic meter |
| CN108195435A (en) * | 2018-03-28 | 2018-06-22 | 上海中核维思仪器仪表有限公司 | Superposing type Commercial ultrasound wave flowmeter runner |
| CN108414037A (en) * | 2018-03-28 | 2018-08-17 | 上海中核维思仪器仪表有限公司 | Gas ultrasonic flowmeter tests the speed runner |
| US11371869B2 (en) | 2019-06-05 | 2022-06-28 | Neptune Technology Group Inc. | Unitized measuring element for water meter assembly |
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| CN201269765Y (en) * | 2008-08-27 | 2009-07-08 | 威海市天罡仪表有限公司 | Ultrasonic flowmeter |
| CN201772900U (en) * | 2010-08-19 | 2011-03-23 | 浙江威星智能仪表股份有限公司 | Ultrasonic gas meter |
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| WO2005064289A1 (en) * | 2003-12-26 | 2005-07-14 | The Tokyo Electric Power Company, Incorporated | Ultrasonic flowmeter, ultrasonic transducer, ultrasonic transmitting/receiving unit, and flowrate measuring method using ultrasonic flowmeter |
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| CN201269765Y (en) * | 2008-08-27 | 2009-07-08 | 威海市天罡仪表有限公司 | Ultrasonic flowmeter |
| CN201772900U (en) * | 2010-08-19 | 2011-03-23 | 浙江威星智能仪表股份有限公司 | Ultrasonic gas meter |
| CN102003984A (en) * | 2010-09-30 | 2011-04-06 | 上海维思仪器仪表有限公司 | Middle-low pressure gas flowmeter with small caliber |
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| CN105403264A (en) | 2016-03-16 |
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Address after: 401121 No. 69, Mount Huangshan Avenue, Yubei District, Chongqing Patentee after: Chongqing Qianwei watch Co., Ltd Address before: 401121 No. 69, Mount Huangshan Avenue, Yubei District, Chongqing Patentee before: QIANWEI KROMSCHRODER METERS (CHONGQING) Co.,Ltd. |