CN202748066U - Gas flowmeter - Google Patents
Gas flowmeter Download PDFInfo
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- CN202748066U CN202748066U CN 201220257808 CN201220257808U CN202748066U CN 202748066 U CN202748066 U CN 202748066U CN 201220257808 CN201220257808 CN 201220257808 CN 201220257808 U CN201220257808 U CN 201220257808U CN 202748066 U CN202748066 U CN 202748066U
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- unit
- sprue
- runner
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Abstract
The utility model relates to the machinery field, in particular to a gas flowmeter. The meter can be directly repaired on a pipe without affecting the measurement. The gas flowmeter comprises a flowmeter body comprising a master channel, a master metering unit and a master memory unit; the master metering unit is arranged on the master channel in a dismountable manner and is used for detecting the flow of total gas in the master channel; the master memory unit memorizes the flow value of the total gas; a bypass unit comprises a bypass channel, a bypass metering unit and a bypass memory unit; the bypass channel is arranged outside the master channel, and two ends of the bypass channel are communicated with the master channel; the bypass metering unit is arranged on the bypass channel and is used for detecting the flow of branched gas in the bypass channel; the bypass memory unit memorizes the flow value of the branched gas; and a display unit displays the flow value of the total gas, and/or the flow value of the branched gas, and/or the difference between the flow value of the total gas and the flow value of the branched gas; and the branched gas is the gas flowing from the total gas into the bypass channel.
Description
Technical field
The utility model relates to mechanical field, is specifically related to a kind of gas meter.
Background technology
Gas dosing is the existing gas metering table that uses in the family particularly, substantially adopts the machinery instrument technology, such as the epithelium gas meter, flow meter.When existing gas meter, flow meter breaks down or gas meter, flow meter is carried out in accordance with regulations when regularly detecting, often need gas meter, flow meter disassembled from gas pipeline and return factory and repair or replace part, thereby need to interrupt gas meter, flow meter or need gas meter, flow meter for subsequent use to substitute, make troubles for carrying out on-site maintenance and detection.
The utility model content
The utility model provides a kind of gas meter, can not affect the metering of gas meter, flow meter when gas meter, flow meter is keeped in repair and proofreaies and correct.
The utility model provides a kind of gas meter, comprising:
The flowmeter main body, it comprises sprue, analytic accounting amount unit and main memory unit; Described analytic accounting amount unit is removable installed on the described sprue, for detection of the flow of total gas in the described sprue; Described main memory unit is used for storing the flow value of total gas that described analytic accounting amount unit inspection arrives;
By-pass unit, it comprises bypass runner, bypass metering units and bypass storage unit; Described bypass runner is arranged on outside the described sprue, and the two ends of described bypass runner are communicated with described sprue; Described bypass metering units is arranged on the described bypass runner, for detection of the flow of in the described bypass runner minute gas; Described bypass storage unit is used for storing the flow value of the described minute gas that described bypass metering units detects;
Display unit, minute gas flow value and/or described total gas couette value and the difference of dividing the gas flow value that it shows the total gas couette value of described main memory unit and/or shows described bypass storage unit;
Wherein, described minute gas is the gas that flows into described bypass runner in described total gas.
In each embodiment of the utility model, preferably, further comprise: fluid rectifier; Described bypass runner is arranged on respect to the side of described analytic accounting amount unit near the gas outlet of described sprue; Described fluid rectifier is arranged in the described sprue and between described bypass runner two ends, is used for flowing into total gas distribution of described sprue, and portion gas flows into the bypass runner.
In each embodiment of the utility model, preferably, described fluid rectifier will flow into described sprue total gas 50% flow into the bypass runner.
In each embodiment of the utility model, preferably, described by-pass road has the central shaft perpendicular with the axial direction of described sprue, and the inwall of described bypass runner has the shape towards described central shaft convergent, and described bypass metering units is arranged on the thinnest place of described convergent shape.
In each embodiment of the utility model, preferably, described bypass metering units and described bypass runner junction arrange seal.
In each embodiment of the utility model, preferably, described bypass metering units comprises the mass rate sensing chip with temperature compensation unit and/or the differential pressure sensing chip with pressure compensation unit.
In each embodiment of the utility model, preferably, described flowmeter main body has at least two mutually described main memory units of backup; And/or described by-pass unit has at least two mutually described bypass storage unit of backup.
In each embodiment of the utility model, preferably, further comprise:
Wireless transmission unit, it is arranged in described flowmeter main body and/or the described by-pass unit.
In each embodiment of the utility model, preferably, the contrast unit, whether its difference that is used for contrasting described total gas couette value and described minute gas flow value in error range, if exceed error range, then gives the alarm.
A kind of gas meter by each embodiment of the utility model provides, can bring following beneficial effect:
Because gas meter can show the total gas couette value, also can show a minute gas flow value, thereby when the analytic accounting amount unit in the flowmeter main body or main memory unit need to be safeguarded or keep in repair, gas meter can be transferred to show a minute gas flow value, thereby do not affected the function of measuring of gas meter; In like manner, when bypass metering units or bypass storage unit need to be safeguarded or keep in repair, gas meter can then show the total gas couette value;
By fluid rectifier is set, can gather by a certain percentage the flow value of total gas couette value and minute gas, be convenient to when switching metering units, carry out the conversion of flow value; Preferably, can select the equal proportion shunting, calculate more easy;
Inwall by the bypass runner is set to the shape with respect to its central shaft convergent, and the bypass metering units is arranged on central axis, can more stably realize the fixing of bypass metering units and bypass runner; Preferably, O-ring seal can be set, can more closely the two be fixed;
Mass rate sensing chip by being provided with temperature compensation unit and/or the differential pressure sensing chip of pressure compensation unit, can compensate the impact for temperature and pressure of the total gas couette value that detects and/or minute gas flow value, reach the effect of accurate-metering;
By two main memory units and/or bypass storage unit, the further security of protected data are set;
By wireless transmission unit is set, the data in main memory unit and/or the bypass storage unit can be sent to miscellaneous equipment;
By the contrast unit is set, can judge main memory unit and bypass storage unit, judge whether to occur error in dipping and whether two metering units damage, can in time find the problem of gas meter, on-call maintenance.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in below describing only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawing illustrated embodiments other embodiment and accompanying drawing thereof.
Fig. 1 is the disassembly diagram of the embodiment of the utility model gas meter;
Fig. 2 is the disassembly diagram of the embodiment of the utility model gas meter;
Fig. 3 is the structural representation of the embodiment of the utility model gas meter;
Fig. 4 is the process flow diagram of embodiment of the metering method of the utility model gas meter.
Embodiment
Below with reference to accompanying drawing the technical scheme of each embodiment of the utility model is carried out clear, complete description, obviously, described embodiment only is a part of embodiment of the present utility model, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are resulting all other embodiment under the prerequisite of not making creative work, all belong to the scope that the utility model is protected.
The utility model provides a kind of gas meter, comprising:
The flowmeter main body, it comprises sprue, analytic accounting amount unit and main memory unit; Described analytic accounting amount unit is removable installed on the described sprue, for detection of the flow of total gas in the described sprue; Described main memory unit is used for storing the flow value of total gas that described analytic accounting amount unit inspection arrives;
By-pass unit, it comprises bypass runner, bypass metering units and bypass storage unit; Described bypass runner is arranged on outside the described sprue, and the two ends of described bypass runner are communicated with described sprue; Described bypass metering units is arranged on the described bypass runner, for detection of the flow of in the described bypass runner minute gas; Described bypass storage unit is used for storing the flow value of the described minute gas that described bypass metering units detects;
Display unit, minute gas flow value and/or described total gas couette value and the difference of dividing the gas flow value that it shows the total gas couette value of described main memory unit and/or shows described bypass storage unit;
Wherein, described minute gas is the gas that flows into described bypass runner in described total gas.
Should be understood that described analytic accounting amount unit and described bypass metering units carry out gage work simultaneously, be independent of each other, realize the active commerce metering.
Should be understood that described gas meter when not keeping in repair, display unit shows the total gas couette value of described main memory unit; When analytic accounting amount unit or main memory unit keeped in repair, display unit can not detect the total gas couette value of described main memory unit, thereby display unit shows the flow value of bypass memory cell storage, is convenient to normal metering.
Should be understood that described analytic accounting amount unit and main memory unit can become one; Described bypass metering units and bypass storage unit can become one.
Should be understood that described bypass metering units can comprise the proportional compensation device, the passing ratio compensator will divide the gas flow value to convert according to a certain percentage the total gas couette value to.
Should be understood that described by-pass unit can be arranged in the gauge outfit.
Should be understood that described bypass runner needs to be communicated with described sprue, when described bypass runner was not communicated with described sprue, described bypass runner then can't pass through described gas.
The distance that should be understood that the gas access of the described sprue of described analytic accounting amount cell distance is 1.5 to 2.5 times of diameter of described sprue.Use in the case and can obtain optimum efficiency.
In each embodiment of the utility model, preferably, further comprise: fluid rectifier; Described bypass runner is arranged on respect to the side of described analytic accounting amount unit near the gas outlet of described sprue; Described fluid rectifier is arranged in the described sprue and between described bypass runner two ends, is used for flowing into total gas distribution of described sprue, and portion gas flows into the bypass runner.
Should understand, be arranged on described fluid rectifier in the described sprue and between described bypass runner two ends, analytic accounting amount unit is arranged on respect to the side of bypass runner away from the gas outlet of described sprue, can reach total gas couette value whole in the analytic accounting amount unit inspection sprue, and minute gas that flows into the bypass runner is for telling according to the shunt ratio of selected fluid rectifier.In the time will dividing the gas flow value to be converted into the total gas couette value, can calculate according to the shunt ratio of fluid rectifier.
Should be understood that described flow distributor is arranged between the outlet of the entrance of described bypass runner and described bypass runner, the distance of the described sprue entrance of distance is 0.5 to 1.5 times of sprue diameter.When one of them metering units damaged, another metering units can calculate the total flow of gas.
Should understand, when the length of the bypass runner length less than analytic accounting amount unit, gas in described sprue is divided into three sections, namely flowing in sprue and before the entrance of bypass runner one section, gas in the sprue is total gas, at a section between the outlet of the entrance in by-pass road and bypass runner on the sprue, be main gas, in this section the flow of total gas be main gas flow with bypass in divide the gas flow sum; On sprue after the outlet of bypass runner to one section between the outlet of sprue, be total gas couette in the sprue.
In each embodiment of the utility model, preferably, described fluid rectifier will flow into described sprue total gas 50% flow into the bypass runner.It is comparatively easy to adopt 50% of total gas to flow into the technique of bypass runner, is convenient to calculate, and namely main gas flow is 1:1 with a minute gas flow.
In each embodiment of the utility model, preferably, described by-pass road has the central shaft perpendicular with the axial direction of described sprue, and the inwall of described bypass runner has the shape towards described central shaft convergent, and described bypass metering units is arranged on the thinnest place of described convergent shape.
Should understand, the inwall of described bypass runner is the shape that has towards described central shaft convergent, i.e. Venturi tube structure, and this structure is when having Fluid Flow in A, produce stronger vacuum in central axis, thus can be positioned at bypass metering units that central shaft goes out more firmly the bypass runner connect.
Should be understood that the utility model to the outer wall shape of bypass runner without limits.
In each embodiment of the utility model, preferably, described bypass metering units and described bypass runner junction arrange seal.By being set, O-ring seal can more securely the bypass metering units be connected with described bypass runner.
In each embodiment of the utility model, preferably, described bypass metering units comprises the mass rate sensing chip with temperature compensation unit and/or the differential pressure sensing chip with pressure compensation unit.
Should be understood that gas meter can be subject to the impact of surrounding environment in metering process, such as temperature and pressure etc., owing to be subject to the impact of environment, then in analytic accounting amount unit and bypass metering units metering process, error can occur.More accurate in order to measure, setting has the mass rate sensing chip of temperature compensation unit function and/or the differential pressure sensing chip of pressure compensation Elementary Function measures, and reduces the impact of environment.
In each embodiment of the utility model, preferably, described flowmeter main body has at least two mutually described main memory units of backup; And/or described by-pass unit has at least two mutually described bypass storage unit of backup.
Should be understood that in order to guarantee the security performance of data, two above main memory units and/or bypass storage unit can be set.
In each embodiment of the utility model, preferably, further comprise: wireless transmission unit, it is arranged in described flowmeter main body and/or the described by-pass unit; Preferably, described wireless transmission unit is bluetooth module or infrared module.
Should be understood that and to adopt wireless transmission unit with the metering result transmission of gas meter, be convenient to gather the metering result; Especially when light is dark or the gas meter installation site is more hidden or be not easy to gather the situation of measuring the result, use.
Should be understood that the Radio Transmission Technology ZigBee that can also adopt short distance, low-power consumption, perhaps GPRS radio transmission apparatus etc.
In each embodiment of the utility model, preferably, further comprise: the contrast unit, whether its difference that is used for contrasting described total gas couette value and described minute gas flow value in error range, if exceed error range, then gives the alarm.
Should understand, in metering process, after the flow of finding main memory unit and bypass storage unit converts in proportion, differ and exceed error range, illustrate that then problem has appearred in one of them metering units, need repairing, then give the alarm this moment and remind the user to keep in repair.
For the metering of gas, the utility model provides and need not to remove the on-site maintenance in flowmeter body connecting pipe road or the gas meter of replacing when not affecting trade metering.Each metering units can independently be calibrated, and can be in ready-made maintenance and replacing.Like this, so that the routine that national requirements is carried out reinspection is more easy, the Trade Measures service that flowmeter is provided requires to be issued to the effect that shortens the time out of service in national standard.Gas meter of the present utility model has automatic temperature, pressure compensation, and variation conforms.In addition, the utility model also have continuous data safety effect, remote data transmission, be easy to the effect of installation and maintenance.
The utility model can also combine with all-electronic technology, has reduced the cost of full-electronic gas meter integral body.
Should be understood that the flowmeter main body can comprise sprue, gauge outfit plate, display and powered battery chamber.
The utility model also provides a kind of metering method of gas meter, and described metering method comprises the steps:
Start gas meter as described;
Detect the flow of total gas and store the total gas couette value; Simultaneously, detect flow and the storage minute gas flow value of minute gas;
Show described total gas couette value and/or show described minute gas flow value and/or the difference of described total gas couette value and minute gas flow value;
Wherein, described minute gas is the gas that flows into described bypass runner in described total gas.
Should be understood that total gas couette and minute gas flow that can measure simultaneously sprue and bypass runner, be independent of each other, namely can independently realize Trade Measures.
Should be understood that when gas meter when not keeping in repair, show the total gas couette value; When analytic accounting amount unit or main memory unit keep in repair, can not detect the total gas couette value, thereby show a minute gas flow value, be convenient to normal metering.
Minute gas flow value that should be understood that the bypass runner can be the replenishing of total gas couette value of sprue, but carries out simultaneously the task of metering.
Should be understood that the bypass metering units can independently be calibrated and pre-calibration, need not to disconnect the sprue of working when keeping in repair at the scene and serving.
In each embodiment of the utility model, preferably, show described total gas couette value and/or show described minute gas flow value and/or the step of described total gas couette value and the difference of minute gas flow value after, further comprise: with described total gas couette value and/or described minute gas flow value wireless transmission.
Should be understood that and with the metering result transmission of gas meter, to be convenient to gather the metering result; Especially when light is dark or the gas meter installation site is more hidden or be not easy to gather the situation of measuring the result, use.
In each embodiment of the utility model, preferably, after detecting described total gas couette value and detecting the step of the flow value that divides gas, and before the step that shows described total gas couette value, further comprise: described total gas couette value and a minute gas flow value that detects carried out temperature and/or pressure compensation, the described total gas couette value after the compensation and a minute gas flow value are stored.
Should be understood that gas meter can be subject to the impact of surrounding environment in metering process, such as temperature and pressure etc., owing to be subject to the impact of environment, then in analytic accounting amount unit and bypass metering units metering process, error can occur.More accurate in order to measure, setting has the mass rate sensing chip of temperature compensation unit function and/or the differential pressure sensing chip of pressure compensation Elementary Function measures, and reduces the impact of environment.
In one embodiment, as shown in Figure 1, Fig. 1 is the disassembly diagram of gas meter, comprising: gauge outfit case 101, fluid rectifier 102, bypass module 103, analytic accounting amount unit 104, analytic accounting amount cell controller 105, battery connector 106, bypass metering units 107, O-ring seal 108, flowmeter main body 109, electric battery 110, master control board 111, LCD display 112, face glass 113, gauge outfit lid 114 and gauge outfit O-ring seal 115.
In gas meter shown in Figure 1, the entrance of the sprue of gas in the flowmeter main body 109 flows into, and portion gas flows into the bypass runner, and bypass metering units 107 detects the flow of gas in the bypass runners; Analytic accounting amount unit 104 detects the flow of gas in the sprue.
The bypass runner is communicated with sprue, gas flows in the bypass runner in sprue, being gas enters from the entrance of sprue, portion gas flows into the bypass runner from the entrance of bypass runner, flow out the bypass runner and enter sprue from the outlet of bypass runner again, the outlet by sprue flows out to outside the sprue.
In one embodiment, as shown in Figure 2, the gas meter by-pass unit comprises bypass metering units 201, bypass runner 202, bypass seal circle 203, bypass coupling assembling 204, bypass pore 205, fluid rectifier 206, sprue 207, O-ring seal 208, integral sealing ring 209 and analytic accounting amount unit 210.
Wherein, Fig. 2 has represented the assembly that by-pass unit in one case has.
In one embodiment, as shown in Figure 3, the external structure for gas meter integral body comprises: gauge outfit 301, display 302, flowmeter main body 303 and gas flow 304.
In one embodiment, as shown in Figure 4, the metering method of gas meter comprises the steps:
Step 400 is: start gas meter;
Step 401 is: the flow value that detects total gas.
Step 402 is: the flow value that detects minute gas.
To should be understood that step 401 and step 402 two steps for carrying out simultaneously, to take this kind mode to explain in order representing convenient herein.
Step 403 is: total gas couette value and a minute gas flow value that detects carried out the temperature and pressure compensation.
Should be understood that because the metering of gas can be subject to the impact of surrounding environment, more accurate in order to measure, two aspects of temperature and pressure are compensated gas.
Step 404 is: the total gas couette value after will compensating and a minute gas flow value are stored.
Should be understood that this step is convenient to flow value is compared.
Step 405 is: show the total gas couette value.
Should be understood that and when the main flow meter damages, will automatically show a minute gas flow value.
Step 406 is: with total gas couette value wireless transmission.
Should be understood that this step also can transmit a minute gas flow value.
By a kind of gas meter and the metering method thereof that each embodiment of the utility model provides, can bring following beneficial effect:
Because gas meter can show the total gas couette value, also can show a minute gas flow value, thereby when the analytic accounting amount unit in the flowmeter main body or main memory unit need to be safeguarded or keep in repair, gas meter can be transferred to show a minute gas flow value, thereby do not affected the function of measuring of gas meter; In like manner, when bypass metering units or bypass storage unit need to be safeguarded or keep in repair, gas meter can then show the total gas couette value;
By fluid rectifier is set, can gather by a certain percentage the flow value of total gas couette value and minute gas, be convenient to when switching metering units, carry out the conversion of flow value; Preferably, can select the equal proportion shunting, calculate more easy;
Inwall by the bypass runner is set to the shape with respect to its central shaft convergent, and the bypass metering units is arranged on central axis, can more stably realize the fixing of bypass metering units and bypass runner; Preferably, O-ring seal can be set, can more closely the two be fixed;
Mass rate sensing chip by being provided with temperature compensation unit and/or the differential pressure sensing chip of pressure compensation unit, can compensate the impact for temperature and pressure of the total gas couette value that detects and/or minute gas flow value, reach the effect of accurate-metering;
By two main memory units and/or bypass storage unit, the further security of protected data are set;
By wireless transmission unit is set, the data in main memory unit and/or the bypass storage unit can be sent to miscellaneous equipment;
By the contrast unit is set, can judge main memory unit and bypass storage unit, judge whether to occur error in dipping and whether two metering units damage, can in time find the problem of gas meter, on-call maintenance.
The various embodiment that the utility model provides can be as required in any way mutually combination, the technical scheme that obtains by this combination is also in scope of the present utility model.
Obviously, those skilled in the art can carry out various changes and modification to the utility model and not break away from spirit and scope of the present utility model.Like this, if of the present utility model these are revised and modification belongs within the scope of the utility model claim and equivalent technologies thereof, then the utility model also comprises these changes and modification interior.
Claims (9)
1. a gas meter is characterized in that, comprising:
The flowmeter main body, it comprises sprue, analytic accounting amount unit and main memory unit; Described analytic accounting amount unit is removable installed on the described sprue, for detection of the flow of total gas in the described sprue; Described main memory unit is used for storing the flow value of total gas that described analytic accounting amount unit inspection arrives;
By-pass unit, it comprises bypass runner, bypass metering units and bypass storage unit; Described bypass runner is arranged on outside the described sprue, and the two ends of described bypass runner are communicated with described sprue; Described bypass metering units is arranged on the described bypass runner, for detection of the flow of in the described bypass runner minute gas; Described bypass storage unit is used for storing the flow value of the described minute gas that described bypass metering units detects;
Display unit, minute gas flow value and/or described total gas couette value and the difference of dividing the gas flow value that it shows the total gas couette value of described main memory unit and/or shows described bypass storage unit;
Wherein, described minute gas is the gas that flows into described bypass runner in described total gas.
2. gas meter as claimed in claim 1 is characterized in that, further comprises: fluid rectifier; Described bypass runner is arranged on respect to the side of described analytic accounting amount unit near the gas outlet of described sprue; Described fluid rectifier is arranged in the described sprue and between described bypass runner two ends, is used for flowing into total gas distribution of described sprue, and portion gas flows into the bypass runner.
3. gas meter as claimed in claim 2 is characterized in that, described fluid rectifier will flow into described sprue total gas 50% flow into the bypass runner.
4. gas meter as claimed in claim 2, it is characterized in that, described by-pass road has the central shaft perpendicular with the axial direction of described sprue, the inwall of described bypass runner has the shape towards described central shaft convergent, and described bypass metering units is arranged on the thinnest place of described convergent shape.
5. gas meter as claimed in claim 4 is characterized in that, described bypass metering units and described bypass runner junction arrange seal.
6. such as each described gas meter among the claim 1-5, it is characterized in that,
Described bypass metering units comprises the mass rate sensing chip with temperature compensation unit and/or the differential pressure sensing chip with pressure compensation unit.
7. such as each described gas meter among the claim 1-5, it is characterized in that described flowmeter main body has at least two mutually described main memory units of backup; And/or described by-pass unit has at least two mutually described bypass storage unit of backup.
8. such as each described gas meter among the claim 1-5, it is characterized in that, further comprise:
Wireless transmission unit, it is arranged in described flowmeter main body and/or the described by-pass unit.
9. such as each described gas meter among the claim 1-5, it is characterized in that, the contrast unit, whether its difference that is used for contrasting described total gas couette value and described minute gas flow value in error range, if exceed error range, then gives the alarm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220257808 CN202748066U (en) | 2012-05-31 | 2012-05-31 | Gas flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220257808 CN202748066U (en) | 2012-05-31 | 2012-05-31 | Gas flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202748066U true CN202748066U (en) | 2013-02-20 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220257808 Withdrawn - After Issue CN202748066U (en) | 2012-05-31 | 2012-05-31 | Gas flowmeter |
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| Country | Link |
|---|---|
| CN (1) | CN202748066U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102735291A (en) * | 2012-05-31 | 2012-10-17 | 卓度仪表（控股）有限公司 | Gas flowmeter and metering method thereof |
-
2012
- 2012-05-31 CN CN 201220257808 patent/CN202748066U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102735291A (en) * | 2012-05-31 | 2012-10-17 | 卓度仪表（控股）有限公司 | Gas flowmeter and metering method thereof |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130220 Effective date of abandoning: 20131127 |
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| RGAV | Abandon patent right to avoid regrant |