CN218628452U

CN218628452U - Capacitive external gas flowmeter

Info

Publication number: CN218628452U
Application number: CN202222990071.3U
Authority: CN
Inventors: 唐云剑
Original assignee: Shanghai Zhentai Instrument Co ltd
Current assignee: Shanghai Zhentai Instrument Co ltd
Priority date: 2022-11-10
Filing date: 2022-11-10
Publication date: 2023-03-14
Anticipated expiration: 2032-11-10

Abstract

The utility model relates to the technical field of flow measurement, in particular to a capacitive external gas flowmeter, which comprises a connecting component, a pipeline component arranged on the connecting component, and a measuring component arranged on the pipeline component; the connecting assembly comprises a valve seat, a first air inlet channel and a second air inlet channel are arranged in the valve seat, and the two channels are independent; the air outlet of the first air inlet channel is sequentially connected with a first vacuum valve and a first cavity of the measuring assembly, the air outlet of the second air inlet channel is connected with a second vacuum valve, and the second vacuum valve is communicated with a second cavity of the measuring assembly; the flowmeter is used for precisely measuring the gas flow in a pipeline, and can also generate an electric signal of direct current voltage when gas flows in the opposite direction so as to play a warning role; the flowmeter is relatively independent of the system to be measured when measuring the flow of the system to be measured, and the internal environment of the system to be measured cannot be influenced.

Description

Capacitive external gas flowmeter

Technical Field

The utility model relates to a flow measurement technical field especially relates to an external gas flowmeter of capacitanc.

Background

The capacitive film gas flowmeter consists of two parts, wherein the first part is a differential pressure transmitter; the second part is a micro differential pressure gauge. When the positive gas flows in, the positive gas firstly enters the small pipeline, flows into the pipe head of the funnel structure after the gap between the wall of the extension pipe and the partition plate is downwards processed by the particle catcher in the main pipe and then enters the gas inlet pipe. When the reverse airflow flows in, the reverse airflow instantly flows into the side of the large pipeline to form a differential pressure on the micro differential pressure gauge, and the sensor outputs a peak value. The sensor mainly comprises the Bernoulli principle and the film capacitance differential pressure principle. The gas flow rate increases and the hydrostatic pressure of the fluid will decrease; conversely, the flow velocity decreases and the static pressure of the fluid will increase. But the sum of the static pressure and the dynamic pressure of the fluid and the total pressure are always kept constant. Different pressure differences are generated according to different flow rates of the front and the back of the sensor, and are finally reflected on the capacitance change of the diaphragm through the internal structure of the sensor to output signals. Patent document 201521027763.1 discloses a device for measuring gas flow of an oil field gas storage, which realizes that the temperature of each point of the inner wall of a gas test channel is obtained through a temperature sensor array through temperature difference, and the gas flow result obtained through instrument calibration is inaccurate.

SUMMERY OF THE UTILITY MODEL

The utility model provides an external gas flowmeter of capacitanc aims at being used for gas flow in the precision measurement pipeline, also can produce direct current voltage's the signal of telecommunication when gas flow appears in the opposite direction to provide the flow meter of accuracy.

In order to achieve the above object, the utility model provides an external gas flowmeter of capacitanc, include: the device comprises a connecting assembly, a pipeline assembly arranged on the connecting assembly and a measuring assembly arranged on the pipeline assembly; the connecting assembly comprises a valve seat, a first air inlet channel and a second air inlet channel are arranged in the valve seat, and the two channels are mutually independent; the gas outlet of the first gas inlet channel is sequentially connected with a first vacuum valve and a first cavity of the measuring assembly, the gas outlet of the second gas inlet channel is connected with a second vacuum valve, and the second vacuum valve is communicated with a second cavity of the measuring assembly.

Preferably, the pipeline assembly comprises a main pipe, and a first air inlet pipe and a second air inlet pipe which are arranged in the main pipe, the main pipe is connected with the valve seat, and the first air inlet pipe is communicated with an air inlet of the first air inlet channel; the second air inlet pipe is communicated with an air inlet of the second air inlet channel, and the first air inlet pipe and the second air inlet pipe are mutually independently arranged in the main pipe.

Preferably, the measuring component includes differential pressure transmitter and electric capacity diaphragm, be equipped with in the differential pressure transmitter electric capacity diaphragm, electric capacity diaphragm will the differential pressure transmitter separates into first cavity with the second cavity, the one end of differential pressure transmitter pass through the pipeline with first vacuum valve intercommunication, the other end of differential pressure transmitter pass through the pipeline with second vacuum valve intercommunication.

And instrument joints are arranged at the joint of the differential pressure transmitter and the first vacuum valve and at the joint of the differential pressure transmitter and the second vacuum valve.

Preferably, the connecting assembly comprises a connecting flange, which is provided on the valve seat.

Compared with the prior art, the utility model discloses technical scheme's beneficial effect: the utility model provides a capacitanc external gas flowmeter, the gas flow in the accurate measurement pipeline, also can appear when gas flows in the opposite direction, produce the electric signal of direct current voltage, in order to play the warning effect, the capacitanc external gas flowmeter can accurately measure the flow of multiple gas in runners such as multiple pipeline; when the flowmeter measures the flow of the system to be measured, the flowmeter is relatively independent of the system to be measured, and the internal environment of the system to be measured cannot be influenced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a capacitive external gas flowmeter provided by the present invention;

fig. 2 is a schematic cross-sectional view of the external capacitive gas flowmeter provided by the present invention.

[ description of reference ]

1: a connecting assembly; 11: a valve seat; 111: a first air intake passage; 112: second intake passage 12: a connecting flange;

2: a conduit assembly; 21: a main pipe; 221: a first vacuum valve; 222: a second vacuum valve; 231: a first intake pipe; 232: a second intake pipe;

3: a measurement component; 31: a differential pressure transmitter; 32: a capacitive diaphragm; 33: an instrument connector; 34: and (4) a pipeline.

Detailed Description

For a better understanding of the present invention, reference will now be made in detail to the present invention, examples of which are illustrated in the accompanying drawings.

It should be noted that all the directional indications in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a certain posture, and if the certain posture is changed, the directional indication is changed accordingly.

In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

The utility model provides an external gas flowmeter of capacitanc, as shown in figure 1, it includes: the device comprises a connecting component 1, a pipeline component 2 arranged on the connecting component 1 and a measuring component 3 arranged on the pipeline component 2; the connecting assembly 1 comprises a valve seat 11, wherein a first air inlet channel 111 and a second air inlet channel 112 are arranged in the valve seat 11, and the two channels are independent; the air outlet of the first air inlet channel 111 is sequentially connected with a first vacuum valve 221 and a first chamber of the measuring assembly 3, the air outlet of the second air inlet channel 112 is connected with a second vacuum valve 222, and the second vacuum valve 222 is communicated with a second chamber of the measuring assembly.

The utility model provides a capacitanc external gas flowmeter, the gas flow in the precision measurement pipeline, also can appear when gas flows in the opposite direction, produce the electric signal of direct current voltage, in order to play the warning effect, the capacitanc external gas flowmeter can measure the flow of multiple gas in the runners such as multiple pipeline accurately; when the flowmeter measures the flow of the system to be measured, the flowmeter is relatively independent of the system to be measured, and the internal environment of the system to be measured cannot be influenced.

Further, the pipe assembly 2 includes a main pipe 21, and a first air inlet pipe 231 and a second air inlet pipe 232 which are arranged in the main pipe 21, the main pipe 21 is connected to the valve seat 11, and the first air inlet pipe 231 is communicated with an air inlet of the first air inlet channel 111; the second air inlet pipe 232 is communicated with an air inlet of the second air inlet channel 112, the first air inlet pipe 231 and the second air inlet pipe 232 are arranged in the main pipe 21 independently, the first air inlet pipe 231 and the second air inlet pipe 232 are circular pipelines 34, and the first air inlet pipe 231 and the second air inlet pipe 232 are independent and not communicated with each other.

As shown in fig. 2, the measuring assembly 3 includes a differential pressure transmitter 31 and a capacitance diaphragm 32, the capacitance diaphragm 32 is disposed in the differential pressure transmitter 31, the capacitance diaphragm 32 separates the differential pressure transmitter 31 into a first chamber and a second chamber, one end of the differential pressure transmitter 31 is communicated with the first vacuum valve 221 through an instrument joint 33 and a pipeline 34, the other end of the differential pressure transmitter 31 is communicated with the second vacuum valve 222 through an instrument joint 33 and a pipeline 34, the differential pressure transmitter 31 is connected with the first vacuum valve 221 and the differential pressure transmitter 31 is connected with the second vacuum valve 222 through an instrument joint 33, the pipeline 34 adopts a copper pipe, and the capacitance diaphragm 32 in the middle of the differential pressure transmitter 31 deforms through the upper and lower pressure difference of the differential pressure transmitter 31, so that a capacitance signal is generated and output through circuit conversion, and the size of a flow rate is determined.

Further, coupling assembling 1 includes flange 12, flange 12 locates on the disk seat 11, disk seat 11 passes through flange 12 and the pipe connection that awaits measuring, introduce the flowmeter by two external pipelines with the measuring medium among the system that awaits measuring, the medium that awaits measuring passes through instrument joint 33 and copper pipe flow direction pressure differential transmitter 31 with first vacuum valve 221 via first intake pipe 231, it is concrete, gaseous from the pipeline that awaits measuring gets into first intake pipe 231 in, the first inlet channel 111 in the disk seat of flowing through, again from first vacuum valve 221 entering pressure differential transmitter 31's first cavity, thereby carry out flow measurement, the flowmeter is relatively independent with the system that awaits measuring, can not influence the internal environment of the system that awaits measuring.

The flowmeter can also be used in a gas flow pipeline, and when gas appears in a forbidden reverse direction, an electric signal of direct current voltage is generated, so that the flowmeter has a warning function. When the gas flows reversely, the original leeward side becomes the windward side, the reverse inlet pressure is directly led into the second cavity of the differential pressure transmission through the inner tube, and the volume of the cavity of the second cavity is very small, the inner tube for leading the pressure into the cavity is thick, the route is short, and the bending is less, so that the pressure loss is small, the front and rear pressure difference is clear when the gas flows reversely, and the gas is not easily covered by interference signals. Wherein, the heating time of the sensor after the connection is not less than 1 hour, the working state of the sensor is vertical, the wire connector faces upwards, and the vertical deviation is not more than 5 degrees. Wherein the pipeline gas pressure of the measuring environment is not more than 11.97KPa, and when the gas flow density in the prohibited reverse direction is increased from 0 to 5mg cm-2 s-1, the time for the output voltage of the sensor to increase from 0 to 24mV is not more than 4s.

It should be understood that the above description of the embodiments of the present invention is only for illustrating the technical lines and features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention accordingly, but the present invention is not limited to the above specific embodiments. All changes and modifications that come within the scope of the claims are to be embraced within their scope.

Claims

1. A capacitive external gas flow meter, comprising: the device comprises a connecting assembly (1), a pipeline assembly (2) arranged on the connecting assembly (1), and a measuring assembly (3) arranged on the pipeline assembly (2); the connecting assembly (1) comprises a valve seat (11), a first air inlet channel (111) and a second air inlet channel (112) are arranged in the valve seat, and the two channels are independent; the air outlet of the first air inlet channel (111) is sequentially connected with a first vacuum valve (221) and a first chamber of the measuring assembly (3), the air outlet of the second air inlet channel (112) is connected with a second vacuum valve (222), and the second vacuum valve (222) is communicated with a second chamber of the measuring assembly (3).

2. The capacitive external gas flowmeter of claim 1, wherein the pipe assembly (2) comprises a main pipe (21) and a first inlet pipe (231) and a second inlet pipe (232) arranged in the main pipe (21), the main pipe (21) is connected with the valve seat (11), and the first inlet pipe (231) is communicated with the inlet of the first inlet channel (111); the second air inlet pipe (232) is communicated with an air inlet of the second air inlet channel (112), and the first air inlet pipe (231) and the second air inlet pipe (232) are independently arranged in the main pipe (21).

3. The external capacitive gas flowmeter of claim 2, wherein the main pipe (21) is provided with a plurality of pressure measurement holes communicated with the first gas inlet pipe (231), and the main pipe (21) is provided with static pressure holes at positions corresponding to the pressure measurement holes, and the static pressure holes are connected with the second gas inlet pipe (232).

4. The external gas flowmeter of any one of claims 1-3, wherein the measuring assembly (3) comprises a differential pressure transmitter (31) and a capacitive diaphragm (32), the capacitive diaphragm (32) is disposed in the differential pressure transmitter (31), the capacitive diaphragm (32) divides the differential pressure transmitter into the first chamber and the second chamber, one end of the differential pressure transmitter (31) is communicated with the first vacuum valve (221) through a pipe (34), and the other end of the differential pressure transmitter (31) is communicated with the second vacuum valve (222) through a pipe (34).

5. The external capacitive gas flowmeter of claim 4, wherein the junction of the differential pressure transducer (31) and the first vacuum valve (221) and the junction of the differential pressure transducer (31) and the second vacuum valve (222) are each provided with a gauge joint (33).

6. The capacitive external gas flowmeter according to any one of claims 1-3, wherein the connection assembly (1) comprises a connection flange (12), the connection flange (12) being provided on the valve seat (11).