CN204085597U - A kind of Pitot bar mass flowmeter - Google Patents

Abstract

The utility model discloses a bitobar mass flowmeter, which has a bitobar flowmeter. The bitobar flowmeter includes a bitobar flow sensor, a differential pressure transmitter and a flow totalizer. The bitobar The flow sensor has a pressure head and a pressure guide tube, and also includes a mass flowmeter connected to the pipeline through the sampling tube for measuring the fluid density in the pipeline. The sampling tube is equipped with a drainage pump. The signal output end of the mass flowmeter is connected to the connected to the signal input terminal of the flow totalizer mentioned above. The mass flowmeter in the utility model indirectly measures the density of the fluid in the pipeline by measuring the density of the fluid in the sampling tube, and the mass flow of the fluid in the pipeline can be obtained according to the volume flow and density of the fluid in the pipeline. When the utility model is used, it is not affected by the diameter of the pipe, and the diameter of the sampling pipe can be made very small, which can greatly reduce the cost of measuring the mass flow rate of the fluid in the pipe.

Description

A bitobar mass flow meter

technical field

The utility model relates to a Bitoba mass flow meter for measuring the mass flow of a fluid in a pipeline.

Background technique

In the prior art, a mass flow meter is a commonly used flow measuring instrument for measuring the mass flow of a fluid in a pipeline. Restricted by technical conditions, mass flowmeters in the prior art can only measure the mass flow rate of fluid in pipes with a diameter of less than 300mm, and there is no corresponding mass flowmeter for the mass flow rate of fluid in pipes with a diameter of more than 300mm. And as the pipe diameter increases, the cost of the corresponding mass flowmeter also increases significantly. The price of a mass flowmeter for measuring the fluid mass flow in a pipe with a pipe diameter below 6mm is 10,000 to 20,000 yuan, and when the pipe diameter is close to 300mm The price of a mass flowmeter for the mass flow of fluid in a pipeline is 700,000 to 800,000 yuan, so the cost of using a mass flowmeter to measure the mass flow of fluid in a large-diameter pipeline is too high, and there is no matching equipment for pipelines with a diameter of more than 300mm Mass flowmeter.

Utility model content

The technical problem to be solved by the utility model is to provide a Bitoba mass flowmeter which is not restricted by the diameter of the pipeline when measuring the mass flow in the pipeline, the measurement cost is relatively low, the structure is simple and the installation is convenient.

In order to solve the above-mentioned technical problems, the utility model is a bitobar mass flowmeter, which has a bitobar flowmeter, and the bitobar flowmeter includes a bitobar flow sensor, a differential pressure transmitter and a flow totalizer. The Bitoba flow sensor has a pressure head and a pressure guide tube, and also includes a mass flowmeter connected to the pipeline through the sampling tube for measuring the fluid density in the pipeline. The sampling tube is equipped with a drainage pump. The signal of the mass flowmeter The output end is connected with the signal input end of the flow totalizer.

When using the above-mentioned Bitoba mass flowmeter, the Bitoba flow sensor is vertically inserted into the pipeline, and the Bitoba flow sensor transmits the extracted total pressure and static pressure signals of the fluid in the pipeline to the differential pressure transmitter. The differential pressure transmitter transmits the differential pressure signal of total pressure and static pressure to the flow totalizer, and the flow totalizer can calculate the volume flow of the fluid in the pipeline; since it also includes the use of the sampling tube connected to the pipeline For the mass flowmeter used to measure the density of the fluid in the pipeline, the sampling pipe is equipped with a drainage pump. The signal output end of the mass flowmeter is connected to the signal input end of the flow totalizer. The drainage pump can drain the fluid in the pipeline to the sampling pipe Then it flows back into the pipeline, that is, the drainage pump can effectively ensure that the fluid in the pipeline flows through the sampling tube, and the mass flowmeter can measure the density of the fluid in the sampling tube. According to the volume flow rate of the fluid in the pipeline and the density of the fluid, you can get The mass flow rate of the fluid in the pipeline. The mass flowmeter in the utility model indirectly measures the density of the fluid in the pipeline by measuring the density of the fluid in the sampling tube, so the measurement is not affected by the diameter of the pipeline, and the diameter of the sampling tube can be made very small, which can The cost of measuring the mass flow rate of the fluid in the measurement pipeline is greatly reduced. The utility model introduces a sampling tube and a drainage pump on the basis of the Bitoba flowmeter, and has a relatively simple structure and is easy to install.

As an improvement of the utility model, the sampling pipe has a water inlet pipe and a water return pipe, and the bottom ends of the water inlet pipe and the water return pipe respectively have a water inlet and a water return port. The pressure guiding pipe protrudes from the bottom of the pressure guiding pipe, the mass flow meter is sealed between the water inlet pipe and the return water pipe on the upper part of the pressure guiding pipe, and the drainage pump is arranged on the upper part of the pressure guiding pipe on the water inlet pipe. After adopting the above-mentioned structure, the sampling tube and the Bitoba flowmeter are actually integrated organically, and the sampling tube becomes a part of the pressure guiding tube, which makes the installation of the utility model more convenient.

As another improvement of the utility model, the sampling pipe is U-shaped, and the two sides of the U-shaped sampling pipe are respectively provided with a water inlet and a water return port for communicating with the bottom wall of the pipeline, and the mass flowmeter is sealed in the U On the bottom edge of the type sampling tube, the drainage pump is arranged on the sampling tube between the mass flow meter and the water return port. When the utility model adopting the above structure is installed, two holes corresponding to the two sides of the sampling tube need to be opened on the pipeline. When the drainage pump or the mass flow meter of the utility model has a fault, it can be repaired separately, and the utility model does not need to be taken off as a whole, which is conducive to the use and maintenance of the utility model.

As a further improvement of the utility model, the diameter of the sampling tube is below 6mm. The pipe diameter of the sampling pipe is less than 6 mm, which can make the cost of the mass flow meter matching it very low, and reduce the manufacturing cost of the utility model as a whole.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is described in further detail.

Fig. 1 is a structural schematic diagram of a Bitobar mass flowmeter proposed according to the technical solution of the present invention when it is installed on a pipeline.

FIG. 2 is a schematic diagram of an enlarged structure at I in FIG. 1 .

Fig. 3 is a structural schematic diagram of another Bitobar mass flowmeter proposed according to the technical solution of the present invention when it is installed on a pipeline. the

Detailed ways

Referring to Fig. 1-Fig. 3, referring to Fig. 1 and Fig. 2 at first, a bitobar mass flowmeter of the utility model has a bitobar flowmeter 10, and the bitobar flowmeter 10 includes a bitobar flow sensor 11, Differential pressure transmitter 12 and flow totalizer 13, described Bitoba flow sensor 11 has pressure-taking head 14 and pressure guide pipe 15, also includes and is used for measuring the fluid in the pipeline that communicates with pipeline 30 through sampling tube 21 The density mass flow meter 20 is equipped with a drainage pump 26 on the sampling pipe 21 , and the signal output end of the mass flow meter 20 is connected with the signal input end of the flow totalizer 13 . The sampling pipe 21 has a water inlet pipe 22 and a water return pipe 23, and the bottom ends of the water inlet pipe 22 and the water return pipe 23 have a water inlet 24 and a water return port 25 respectively, and the water inlet pipe 22 and the water return pipe 23 pass through the water inlet pipe 22 and the water return pipe 23 from top to bottom. The pressure guiding pipe 15 protrudes from the bottom of the pressure guiding pipe 15, the mass flow meter 20 is sealed between the water inlet pipe 22 and the return water pipe 23 on the upper part of the pressure guiding pipe 15, and the drainage pump 26 is set On the water inlet pipe 22 located at the top of the pressure guiding pipe 15 .

Referring to Fig. 3, the sampling pipe 21 is U-shaped, and the two sides of the U-shaped sampling pipe respectively have a water inlet 24' and a water return port 25' for communicating with the bottom wall of the pipeline, and the mass flowmeter 20 is sealed in the U On the bottom edge of the type sampling tube, the drainage pump 26 is arranged on the sampling tube 21 between the mass flow meter 20 and the water return port 25'.

The diameter of the sampling tube is below 6mm.

Claims (4)

1. A bitobar mass flowmeter has a bitobar flowmeter (10), and the bitobar flowmeter (10) includes a bitobar flow sensor (11), a differential pressure transmitter (12) and a flow rate The integrator (13), the Bitobah flow sensor (11) has a pressure taking head (14) and a pressure guiding tube (15), and is characterized in that: it also includes a sampling tube (21) connected to the pipeline (30) A common mass flowmeter (20) used to measure the density of the fluid in the pipeline, a drainage pump (26) is installed on the sampling pipe (21), and the signal output end of the mass flowmeter (20) is connected to the flow totalizer (13 ) connected to the signal input. 2. The Bitoba mass flowmeter according to claim 1, characterized in that: the sampling pipe (21) has an inlet pipe (22) and a return pipe (23), the inlet pipe (22) and the return pipe (23) ) have a water inlet (24) and a water return port (25) at the bottom respectively, the water inlet pipe (22) and the water return pipe (23) pass through the pressure guiding tube (15) from top to bottom and from the pressure guiding tube (15) protrudes from the bottom, the mass flow meter (20) is sealed and installed between the water inlet pipe (22) and the return pipe (23) on the upper part of the pressure guiding pipe (15), and the drainage pump (26 ) is arranged on the water inlet pipe (22) located on the upper part of the pressure guiding pipe (15). 3. The Bitoba mass flowmeter according to claim 1, characterized in that: the sampling pipe (21) is U-shaped, and the two sides of the U-shaped sampling pipe respectively have water inlets for communicating with the bottom wall of the pipeline (24') and the water return port (25'), the mass flow meter (20) is sealed on the bottom edge of the U-shaped sampling pipe, and the drainage pump (26) is arranged on the mass flow meter (20) and the water return port (25') on the sampling tube (21). 4. The Bitobar mass flow meter according to any one of claims 1-3, characterized in that: the diameter of the sampling tube (21) is below 6mm.