CN205246143U - Gas metering - Google Patents

Abstract

The utility model provides a gas flow meter, which comprises: a housing, a main body of the flow meter and an electronic control component warehouse. The casing is arranged outside the main body of the flowmeter, and the electronic control component warehouse is arranged on the casing. The flowmeter main body includes an air inlet port, an air outlet port, and a gas channel between the air inlet port and the air outlet port. A first gas flow channel and a second gas flow channel are arranged in the gas flow channel, and sensors are respectively arranged in the first gas flow channel and the second gas flow channel. The electronic control component warehouse calculates the total value of the gas corresponding to the first gas flow channel and the total gas value corresponding to the second gas flow channel respectively through the fluid parameters collected by the sensor, and the electronic control component warehouse also displays The total value of the above gases. The utility model solves the technical problems of difficult installation and maintenance of the gas flow meter, small range ratio and inaccurate measurement data caused by continuous measurement after the sensor is polluted.

Description

Barometer

technical field

The utility model relates to the field of gas metering, in particular to a gas flow meter.

Background technique

Existing gas meters used for small commercial gas users (flow range 0-50 cubic meters per hour) are mainly membrane-type mechanical meters. The membrane-type mechanical meters are large in size, and the measurement data requires an additional digital conversion device to convert the mechanical signal into Electronic signals increase the difficulty and cost of installation and maintenance. The range ratio of the existing mechanical instruments and electronic gas flowmeters is limited to the design of the mechanical meter structure and electronic components. Generally, the range ratio is not large, which can often meet the measurement of large range, but cannot meet the measurement of small range. At the same time, due to the complex internal environment of the gas flow channel, when the sensor is polluted or damaged, it cannot be detected and maintained in time, which will lead to inaccurate gas flow measurement. How to provide a gas flowmeter that is easy to install, has a relatively large measuring range and is accurate is a technical problem that needs to be solved urgently for those skilled in the art.

Utility model content

In order to overcome the defects of difficult installation and maintenance of gas flowmeters in the prior art, small range ratio and inaccurate measurement data caused by continuous measurement after sensor contamination, the technical problem to be solved by this utility model is to provide a sensor that is easy to install, has a relatively large range A gas flowmeter that can alarm in time after pollution.

The utility model provides a gas flow meter, which comprises: a housing, a main body of the flow meter and an electronic control component warehouse. The casing is arranged outside the main body of the flowmeter, and the electronic control component warehouse is arranged on the casing. The main body of the flowmeter includes an air inlet port, an air outlet port, and a gas flow channel between the air inlet port and the air outlet port, and the air inlet port and the air outlet port are arranged on the on the same side. The gas flow channel is provided with a first gas flow channel and a second gas flow channel, the gas flow direction in the first gas flow channel is the same as the gas flow direction in the gas flow channel, the first gas flow channel and the gas flow channel A space between the gas flow paths constitutes the second gas flow path. A first sensor unit is arranged in the first gas flow channel, and the first sensor unit is used to measure a gas flow parameter flowing through the first gas flow channel. A second sensor unit is arranged in the second gas flow channel, and the second sensor unit is used for measuring a gas flow parameter flowing through the second gas flow channel. The electronic control component warehouse includes a first metering unit, a first storage unit, a second metering unit, a second storage unit and a display unit. The first metering unit is connected to the first sensor unit for calculating the total amount of gas flowing through the first gas channel, and the second metering unit is connected to the second sensor unit for calculating the flow The total amount of gas passing through the second gas channel. The first storage unit is used for storing the total amount of gas flowing through the first gas channel, and the second storage unit is used for storing the total value of gas flowing through the second gas channel. The first storage unit and the second storage unit are connected to the display unit, and the display unit displays the total amount of gas in the first storage unit and/or the second storage unit.

Further, the first gas flow channel in the above gas flowmeter is a Venturi structure, the first sensor unit is arranged at the throat position of the Venturi structure, and the second sensor unit is arranged at the throat position of the Venturi structure. at the position of the inner wall of the second gas channel. Setting the first sensor unit at the throat position of the Venturi structure of the first gas flow channel facilitates better measurement of gas flow parameters, and setting the second sensor unit at the inner wall position of the second gas flow channel It is for the convenience of the second sensor unit to accurately measure the gas flow parameters.

Further, the first sensor unit and the second sensor unit in the gas flow meter include a mass flow sensor with a temperature compensation function and a differential pressure sensor with a pressure compensation function. The detected gas flow value will be affected by temperature and pressure, and the measured data can be made more accurate through temperature and pressure compensation.

Further, the electronic control module warehouse in the above-mentioned gas flow meter further includes: a first backup storage unit and a second backup storage unit. The first backup storage unit is used for backing up data of the first storage unit, and the second backup storage unit is used for backing up data of the second storage unit. Back up the data in the storage unit to another backup storage unit. It can effectively prevent the loss of data information caused by accidental damage to the storage unit, and ensure the safety of data information.

Further, the above gas flow meter further includes: a valve, the valve is arranged between the first gas flow channel and the inlet port at a position close to the inlet port. Closing the valve when the gas flowmeter is low in electricity, in arrears, or fails to measure normally can effectively prevent potential safety hazards.

Further, the first storage unit and the second storage unit in the gas flow meter are connected to the display unit through wires.

Further, the above gas flow meter further includes: a fluid rectifier, and the fluid rectifier is arranged between the first gas flow channel and the air inlet port. The fluid rectifier is used to divide the gas flowing into the gas flow channel, so that part of the gas flows into the first gas flow channel, and the remaining part of the gas flows into the second gas flow channel. The fluid rectifier has the function of combing the flow state of the gas flowing through the gas pipeline. By adjusting the fluid rectifier, the ratio of gas entering the first gas flow channel and the second gas flow channel can be changed.

Further, the first metering unit and the second metering unit in the above gas flowmeter include proportional compensators. The proportional compensator compensates the actual gas total value calculated by the first metering unit and the second metering unit according to the split ratio of the fluid rectifier, so that the first metering unit and the second metering unit The total value of gas after compensation calculated by the metering unit is equal to the total value of gas flowing through the gas channel. According to the split ratio of the fluid rectifier, the actual gas total value obtained by the first metering unit and the second metering unit is compensated, and the flow through can be realized by displaying the total gas value of the first storage unit or the second storage unit The reading of the total gas flow value of the gas channel.

Further, the fluid rectifier in the gas flow meter divides the gas flowing into the gas flow channel in equal proportions, so that the gas flow rates entering the first gas flow channel and the second gas flow channel are equal. It is convenient to carry out the compensation calculation by performing the same proportional shunt.

Compared with the prior art, the utility model provides a gas flowmeter comprising: a casing, a flowmeter main body and an electronic control component compartment. The casing is arranged outside the main body of the flowmeter, and the electronic control component warehouse is arranged on the casing. The main body of the flowmeter includes an air inlet port, an air outlet port, and a gas flow channel between the air inlet port and the air outlet port, and the air inlet port and the air outlet port are arranged on the on the same side. The gas flow channel is provided with a first gas flow channel and a second gas flow channel, the gas flow direction in the first gas flow channel is the same as the gas flow direction in the gas flow channel, the first gas flow channel and the gas flow channel A space between the gas flow paths constitutes the second gas flow path. A first sensor unit is arranged in the first gas flow channel, and the first sensor unit is used to measure a gas flow parameter flowing through the first gas flow channel. A second sensor unit is arranged in the second gas flow channel, and the second sensor unit is used for measuring a gas flow parameter flowing through the second gas flow channel. The electronic control component warehouse includes a first metering unit, a first storage unit, a second metering unit, a second storage unit and a display unit. The first metering unit is connected to the first sensor unit for calculating the total amount of gas flowing through the first gas channel, and the second metering unit is connected to the second sensor unit for calculating the flow The total amount of gas passing through the second gas channel. The first storage unit is used for storing the total amount of gas flowing through the first gas channel, and the second storage unit is used for storing the total value of gas flowing through the second gas channel. The first storage unit and the second storage unit are connected to the display unit, and the display unit displays the total amount of gas in the first storage unit and/or the second storage unit. The above-mentioned gas flowmeter can directly output electronic signals without external data conversion devices, saving installation and maintenance costs. Compared with the existing gas flowmeter, the above-mentioned gas flowmeter is provided with two gas flow channels, and the two gas flow channels correspond to two sets of independent gas metering systems, which can improve the range ratio of the gas flowmeter for gas measurement. At the same time, the two sensors are located in different airways, and the data obtained by the two independent measurements can be compared to determine the contamination of the sensors. When there is a difference in the comparison between the two data, a pollution alarm can be issued to prompt instrument maintenance to ensure the accuracy of data measurement.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic structural view of a gas flowmeter provided by the first specific embodiment of the present invention;

Fig. 2 is a schematic cross-sectional view of the gas flowmeter provided by the first specific embodiment of the present invention;

Fig. 3 is a schematic structural view of some gas flow channels in the gas flow meter provided by the first specific embodiment of the present invention;

Fig. 4 is a schematic structural view of the first gas flow channel in the gas flow meter provided by the first specific embodiment of the present invention;

Fig. 5 is a structural frame diagram of the electronic control module compartment in the gas flow meter provided by the first specific embodiment of the utility model.

Among them, the reference signs are summarized as follows:

Gas flowmeter 100; shell 110; flowmeter body 120; inlet port 121; gas outlet port 122; gas flow channel 123; first gas flow channel 1232; second gas flow channel 1233; throat 1234; first sensor unit 1235 The second sensor unit 1237; the valve 124; the fluid rectifier 125; the electronic control assembly warehouse 130;

detailed description

The utility model will be described in further detail below through specific implementation examples and in conjunction with the accompanying drawings.

Referring to FIG. 1 and FIG. 2 , the gas flowmeter 100 provided by the first specific embodiment of the present invention includes: a casing 110 , a flowmeter main body 120 and an electronic control component compartment 130 . The housing 110 is disposed outside the flowmeter main body 120 , and the electronic control module compartment 130 is disposed on the housing 110 . The flowmeter main body 120 includes an air inlet port 121, an air outlet port 122, and a gas channel 123 between the air inlet port 121 and the air outlet port 122, and the air inlet port 121 and the air outlet port 122 It is arranged on the same side of the gas flow meter 100 . The gas flow channel 123 is provided with a first gas flow channel 1232 and a second gas flow channel 1233, the gas flow direction in the first gas flow channel 1232 is the same as the gas flow direction in the gas flow channel 123, The space between the first gas flow channel 1232 and the gas flow channel 123 constitutes the second gas flow channel 1233 .

Referring to FIG. 3 and FIG. 4 , a first sensor unit 1235 is disposed in the first gas flow channel 1232 , and the first sensor unit 1235 is used to measure gas flow parameters flowing through the first gas flow channel 1232 . A second sensor unit 1237 is disposed in the second gas flow channel 1233 , and the second sensor unit 1237 is used to measure the gas flow parameters flowing through the second gas flow channel 1233 .

Referring to FIG. 5 , the electronic control unit warehouse 130 includes a first metering unit 131 , a first storage unit 132 , a second metering unit 133 , a second storage unit 134 and a display unit 136 . The first metering unit 131 is connected to the first sensor unit 1235 for calculating the total amount of gas flowing through the first gas channel 1232, and the second metering unit 133 is connected to the second sensor unit 1237 The connection is used to calculate the total amount of gas flowing through the second gas channel 1233 . The first storage unit 132 is used to store the total amount of gas flowing through the first gas flow channel 1232 , and the second storage unit 134 is used to store the total amount of gas flowing through the second gas flow channel 1233 value. The first storage unit 132 and the second storage unit 134 are connected to the display unit 136 , and the display unit 136 displays the total amount of gas in the first storage unit 132 and/or the second storage unit 134 .

In this specific embodiment, the inlet port 121 and the gas outlet port 122 are arranged on the same side of the gas flow meter 100 , which can be widely applied to the current situation where the city gas supply pipeline is arranged on the same side. At the same time, threads are provided on the inlet port 121 and the gas outlet port 122, and the installation of the gas flowmeter 100 can be realized by connecting the threads to the gas supply pipeline, which can be widely used in the measurement of city gas.

In this specific embodiment, the above-mentioned gas flowmeter 100 can directly output electronic signals without an external data conversion device, saving installation and maintenance costs. The gas flow channel 123 is divided into a first gas flow channel 1232 and a second gas flow channel 1233 , and the two gas flow channels correspond to two sets of independent gas metering systems, which can improve the turndown ratio of the gas flowmeter 100 for gas measurement. At the same time, the two sensors are located in different airways, and the data obtained by the two independent measurements can be compared to determine the contamination of the sensors. When there is a difference in the comparison between the two data, a pollution alarm can be issued to prompt instrument maintenance to ensure the accuracy of data measurement.

Referring to Fig. 3 and Fig. 4, in the gas flow meter 100 provided in the first specific embodiment of the present utility model, further, the first gas flow channel 1232 is a Venturi structure, and the first sensor unit 1235 is arranged on the At the position of the throat 1234 of the Venturi structure, the second sensor unit 1237 is disposed at the inner wall of the second gas channel 1233 .

In this specific embodiment, the Venturi structure is installed in the gas flow channel 123, the central axis of the Venturi structure needs to be parallel to the gas flow direction in the gas flow channel 123, and the inlet of the inlet section of the Venturi structure is the inlet of the first gas flow channel 1232 , and the outlet of the diffuser section of the Venturi structure is the gas outlet of the first gas flow channel 1232 . The first sensor unit 1235 is disposed at the throat 1234 of the Venturi structure, and the second sensor unit 1237 is disposed at the inner wall of the second gas channel 1233 . The first sensor unit 1235 and the second sensor unit 1237 are used to measure gas flow parameters flowing through the gas channel 123 where they are located. The gas flow parameters include thermal field variation, and the thermal field variation is used to measure the gas flow, which is more accurate than the gas flow measured by volumetric and velocity measurement gas flowmeters on the market.

Through the limitation of the above structure, when the gas flows into the second gas flow channel 1233, a strong vacuum will be generated at the position of the inner wall of the second gas flow channel 1233 corresponding to the position of the throat 1234 of the Venturi structure, Therefore, the second sensor unit 1237 disposed at this position can be more stably connected to the inner wall of the second gas flow channel 1233 .

Referring to Fig. 3, in the gas flow meter 100 provided in the first specific embodiment of the present utility model, further, the first sensor unit 1235 and the second sensor unit 1237 may also include a mass flow sensor with temperature compensation function And a differential pressure sensor with pressure compensation.

In actual production and life, the gas flowmeter 100 will inevitably be affected by the surrounding environment during the measurement process, such as temperature and pressure. Due to the influence of the environment, the first sensor unit 1235 and the second sensor unit 1237 will have errors in the measurement process. For this reason, in this specific embodiment, a mass flow sensor with a temperature compensation function and a differential pressure sensor with a pressure compensation function may also be provided in the first sensor unit 1235 and the second sensor unit 1237 . The first sensor unit 1235 and the second sensor unit 1237 also send temperature and pressure compensation parameters to the first metering unit 131 and the second metering unit 133, and the calculated data after considering environmental compensation is more accurate, Reduce the influence of environmental factors on the measurement results.

In the gas flow meter 100 provided in the first specific embodiment of the present utility model, further, the electronic control module warehouse 130 further includes: a first backup storage unit and a second backup storage unit, and the first backup storage unit is used for The data of the first storage unit 132 is backed up, and the second backup storage unit is used for backing up the data of the second storage unit 134 .

In actual production and life, it is often found that data is lost due to memory damage. In order to ensure data security, in this specific embodiment, backup storage units are respectively set for the first storage unit 132 and the second storage unit 134. To ensure data security, even if the first storage unit 132 and/or the second storage unit 134 are damaged, accurate data can still be obtained from their backup storage units.

Referring to Fig. 1, in the gas flow meter 100 provided in the first specific embodiment of the present utility model, further, the flow meter body 120 further includes: a valve 124, the valve 124 is arranged between the first gas flow channel 1232 and A position between the air inlet ports 121 close to the air inlet ports 121 . Closing the valve when the gas flowmeter is low in electricity, in arrears, or fails to measure normally can effectively prevent potential safety hazards.

In the gas flow meter 100 provided in the first specific embodiment of the present utility model, further, the first storage unit 132 and the second storage unit 134 are connected to the display unit 136 through wires.

In this specific embodiment, the first storage unit 132 and the second storage unit 134 transmit the total value of the gas stored in the first storage unit 132 and the second storage unit 134 to the display unit 136 through wires . The wires may include various metal wires with good electrical conductivity and shielded cables. Preferably, shielded cables are used to connect the first storage unit 132 and the second storage unit 134 with the display unit 136 during use.

Referring to Fig. 2 and Fig. 3, the gas flow meter 100 provided in the first specific embodiment of the present utility model, further, the gas flow meter 100 may further include: a fluid rectifier 125, the fluid rectifier 125 is arranged on the Between the first gas flow channel 1232 and the air inlet port 121, the fluid rectifier 125 is used to divide the gas flowing into the gas flow channel 123, so that part of it flows into the first gas flow channel 1232, and the rest The lower part of the gas flows into the second gas channel 1233 .

The fluid rectifier 125 has the function of combing the flow state of the gas flowing through the gas pipeline. By adjusting the fluid rectifier 125, the ratio of gas entering the first gas flow channel 1232 and the second gas flow channel 1233 can be changed. In the specific operation process, the required gas split ratio can be obtained through debugging.

In the gas flow meter 100 provided in the first specific embodiment of the present utility model, further, the first metering unit 131 and the second metering unit 133 in the gas flow meter 100 may further include a proportional compensator. The proportional compensator compensates the actual gas total value calculated by the first metering unit 131 and the second metering unit 133 according to the split ratio of the fluid rectifier 125, so that the first metering unit 131 and the second metering unit 133 The value of the total amount of gas after compensation calculated by the second metering unit 133 is equal to the value of the total amount of gas flowing through the gas channel 123 .

According to the flow split ratio of the fluid rectifier 125, the actual gas total value obtained by the first metering unit 131 and the second metering unit 133 is compensated by displaying the compensated gas in the first storage unit 132 or the second storage unit 134 The total value can realize the reading of the total flow value of the gas flowing through the gas channel 123 . When maintaining or repairing the first metering unit 131 or the first storage unit 132 in the flowmeter main body 120, the gas flowmeter 100 can display the total gas value of the second gas flow channel 1233, so as not to affect the gas flowmeter 100 metering function. Similarly, when the second metering unit 133 or the second storage unit 134 needs to be maintained or repaired, the gas flow meter 100 can display the total gas value of the first gas channel 1232 . By switching the readings of the first gas flow channel 1232 or the second gas flow channel 1233, the gas flowmeter 100 does not need to be suspended or replaced when the gas metering system is being repaired or tested on site.

In this specific embodiment, further, the fluid rectifier 125 divides the gas flowing into the gas flow channel 123 in equal proportions, so that the gas entering the first gas flow channel 1232 and the second gas flow channel 1233 Gas flow is equal. It is convenient to carry out the compensation calculation by using the same proportional shunt.

To sum up, the gas flow meter provided by the utility model can directly output electronic signals without external data conversion device, saving installation and maintenance costs. At the same time, two gas flow channels are set on the basis of the existing gas flowmeter, and the two gas flow channels correspond to two sets of independent gas metering systems. One set of gas metering systems is still functioning normally. At the same time, the two sensors are located in different airways, and the data obtained by the two independent measurements can be compared to determine the contamination of the sensors. When the comparison between the two data is different from the original data, a pollution alarm can be issued to prompt instrument maintenance. Therefore, it solves the technical problems of the difficulty in installation and maintenance of the single gas metering system in the prior art and the need to suspend or replace the gas flow meter when on-site maintenance or testing is required.

It should be noted that each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. For the same and similar parts in each embodiment, refer to each other, that is, Can.

The above descriptions are only preferred embodiments of the utility model, and are not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model. It should be noted that like numerals and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that is usually placed when the product of the utility model is used. It is only for the convenience of describing the utility model and simplifying the description, rather than Any indication or implication that a referenced device or element must have a particular orientation, be constructed, and operate in a particular orientation should not be construed as limiting the invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions, and should not be construed as indicating or implying relative importance.

In the description of the present utility model, it should also be noted that, unless otherwise specified and limited, the terms "setting", "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection , can also be detachably connected, or integrally connected; can be mechanically connected, can also be electrically connected; can be directly connected, can also be indirectly connected through an intermediary, and can be internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.

Claims (10)

1. a gas flowmeter, is characterized in that, comprising: housing, flowmeter main body andElectronic Control Unit storehouse, described housing is arranged at outside described flowmeter main body, described electronics controlAssembly processed storehouse is arranged on described housing, and described flowmeter main body comprises, intake interface, goes outGas interface and described intake interface and described in the gas flow of giving vent to anger between interface, described inIntake interface with described in the interface of giving vent to anger be arranged on the same side of described gas flowmeter, instituteState in gas flow and be provided with the first gas flow and the second gas flow, gas is describedIn one gas flow, flow direction is identical with gas flow direction in described gas flow, instituteThe space of stating between the first gas flow and described gas flow forms described the second gas flowRoad, is provided with first sensor unit in described the first gas flow, described first sensorUnit is for measuring the gas flow parameter of described the first gas flow of flowing through, described the second gasIn body runner, be provided with the second sensor unit, described the second sensor unit is used for measuring streamThrough the gas flow parameter of described the second gas flow, described Electronic Control Unit storehouse comprisesOne metering units, the first memory cell, the second metering units, the second memory cell and demonstrationUnit, described the first metering units is connected with described first sensor unit for calculating flows throughThe total amount value of described the first gas flow gas, described the second metering units and described second passesSensor cell connects the total amount value for calculating described the second gas flow gas of flowing through, described inThe first memory cell is the total amount value through described the first gas flow gas for storage flow, described inThe second memory cell is the total amount value through described the second gas flow gas for storage flow, described inThe first memory cell is connected with described display unit with the second memory cell, described display unitShow the total amount value of gas in described the first memory cell and/or the second memory cell.

2. gas flowmeter as claimed in claim 1, is characterized in that: described the first gasRunner is a Venturi tube structure, and described first sensor unit is arranged at described Venturi tube structureVenturi position, described the second sensor unit be arranged at described the second gas flow inWall position.

3. gas flowmeter as claimed in claim 1, is characterized in that: described the first sensingDevice unit and described the second sensor unit comprise having the mass flow of temperature compensation functionSensor and there is the differential pressure pick-up of pressure compensation.

4. gas flowmeter as claimed in claim 1, is characterized in that described Electronic ControlAssembly storehouse also comprises: the first redundant memory cell and the second redundant memory cell, described firstRedundant memory cell is for backing up the data of described the first memory cell, and described the second backup is depositedStorage unit is for backing up the data of described the second memory cell.

5. gas flowmeter as claimed in claim 1, is characterized in that described flowmeter masterBody also comprises: valve, described valve is arranged at described the first gas flow and described air inlet connectingThe position of close described intake interface between mouthful.

6. gas flowmeter as claimed in claim 1, is characterized in that: described the first storageUnit is connected with described display unit by wire with the second memory cell.

7. gas flowmeter as claimed in claim 6, is characterized in that: described wire is screenCover cable.

8. gas flowmeter as claimed in claim 1, is characterized in that, also comprises: first-classBody rectifier, described fluid rectifier is arranged at described the first gas flow and described air inlet connectingBetween mouthful, described fluid rectifier is used for the gas that flows into described gas flow to shunt,Make a wherein part flow into described the first gas flow, remaining portion gas flows into described secondGas flow.

9. gas flowmeter as claimed in claim 8, is characterized in that: described the first meteringUnit and described the second metering units comprise proportional compensation device, and described proportional compensation device is according to instituteState the shunt ratio of fluid rectifier to described the first metering units and described the second metering unitsThe real gas total amount value calculating compensates, make described the first metering units with described inThe gas gross value described gas flow that equals to flow through after the compensation that the second metering units calculatesGas gross value.

10. gas flowmeter as claimed in claim 8, is characterized in that: control and enter instituteThe gas flow rate of stating the first gas flow and described the second gas flow, makes described gas flow rateBe no more than 20m/s.