CN215448061U - Differential pressure flowmeter based on venturi tube pressure tapping - Google Patents
Differential pressure flowmeter based on venturi tube pressure tapping Download PDFInfo
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- CN215448061U CN215448061U CN202121914668.9U CN202121914668U CN215448061U CN 215448061 U CN215448061 U CN 215448061U CN 202121914668 U CN202121914668 U CN 202121914668U CN 215448061 U CN215448061 U CN 215448061U
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Abstract
The utility model provides a differential pressure flowmeter based on venturi gets pressure, includes the casing, and the top of casing is provided with electric connector, and venturi is connected to the bottom of casing, and the inside of casing is provided with differential pressure sensor and circuit board, differential pressure sensor's positive and negative pressure induction diaphragm communicates through the pipeline around sealed passageway and venturi's the throat respectively, and differential pressure sensor's collection signal transmits for the circuit board, the circuit board pass through the wire and link to each other with electric connector, realize signal output through electric connector. The differential pressure sensor is fixed in the shell through a sensor mounting seat. Two sealing channels are arranged on the sensor mounting seat, pipelines in front of and behind the throat neck of the Venturi tube are inserted into one ends of the two sealing channels through leading-out interfaces, and the other ends of the two sealing channels are opposite to the positive and negative pressure sensing diaphragms of the differential pressure sensor. The utility model has compact structure, small volume of the whole machine, convenient installation and difficult influence of vibration or overload on reliability.
Description
Technical Field
The utility model belongs to the field of differential pressure flowmeters, and particularly relates to a differential pressure flowmeter for taking pressure based on a venturi tube.
Background
The differential pressure flowmeter is an instrument for measuring flow, and the measurement principle of the differential pressure flowmeter is as follows: when the fluid filling the pipe passes through the throttling element in the throttling element pipe, the flow velocity forms local contraction at the throat of the pipe, so that the flow velocity is increased, the static pressure is reduced, and the pressure difference is generated before and after the throat of the pipe. The greater the fluid flow, the greater the pressure differential that is generated, which can be used to measure the flow rate based on the pressure differential. This measurement is based on the flow continuity equation (law of conservation of mass) and the bernoulli equation (law of conservation of energy). The existing differential pressure flowmeter guides the front pressure and the rear pressure of a throttling element to the outside of a pipeline through two independent pipelines, transmits the pressure to an independent differential pressure transmitter, and sequentially realizes that the flow rate is obtained by measuring a differential pressure value.
The existing pressure taking structure has the defects of insufficient structure compactness, inconvenient installation due to overlarge volume of the whole differential pressure flowmeter, poor reliability under the condition of vibration or overload and easy pressure leakage at a pipeline connecting point.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problems in the prior art, and provides a differential pressure flowmeter based on venturi tube pressure measurement, which avoids leakage of the differential pressure flowmeter when the pressure of a pipeline throttling element is measured in front of and behind and improves the working reliability.
In order to achieve the purpose, the utility model has the following technical scheme:
the utility model provides a differential pressure flowmeter based on venturi gets pressure, includes the casing, and the top of casing is provided with electric connector, and venturi is connected to the bottom of casing, and the inside of casing is provided with differential pressure sensor and circuit board, differential pressure sensor's positive and negative pressure induction diaphragm communicates through the pipeline around sealed passageway and venturi's the throat respectively, and differential pressure sensor's collection signal transmits for the circuit board, the circuit board pass through the wire and link to each other with electric connector, realize signal output through electric connector.
In a preferred embodiment of the present invention, the differential pressure sensor is fixed inside the casing by a sensor mount.
As a preferable scheme of the utility model, the sensor mounting seat is provided with two sealing channels, pipelines in front of and behind the throat of the Venturi tube are inserted into one ends of the two sealing channels through the leading-out interfaces, and the other ends of the two sealing channels are opposite to the positive and negative pressure sensing diaphragms of the differential pressure sensor.
As a preferable scheme of the present invention, a first sealing ring is disposed on an outer periphery of the lead-out interface, and the first sealing ring hermetically connects the lead-out interface with one end of the sealing channel.
In a preferred embodiment of the present invention, the differential pressure sensor is provided with second sealing rings on the outer peripheries of the rear sides of the positive and negative pressure sensing diaphragms, respectively.
As a preferable scheme of the utility model, the top of the Venturi tube is provided with an assembly panel, and the assembly panel is connected with the bottom of the shell through screws.
In a preferred embodiment of the present invention, the electrical connector is mounted on the top of the housing through a support, and the support is connected to the top of the housing by screws.
As a preferable scheme of the present invention, the circuit board is provided with a signal amplifier, and the signal amplifier amplifies the collected signal of the differential pressure sensor.
In a preferred embodiment of the present invention, the outer peripheries of both ends of the venturi tube are threaded.
Compared with the prior art, the utility model has the following beneficial effects: according to the utility model, the pressure taking holes of the two differential pressure sensors are integrated on the Venturi tube with the throttling device, so that the positive and negative pressure sensing diaphragms of the differential pressure sensors are respectively communicated with the pipelines in front of and behind the throat neck of the Venturi tube through the sealing channels, the front and back pressures of the throttling element are not required to be guided to the outside of the pipeline through two independent pipelines, and then the pressures are transmitted to the independent differential pressure transmitters, and the unreliable or pressure leakage caused by secondary pressure guiding connection through the pressure guiding pipeline is avoided. The utility model integrates the throttling element and the pressure guiding pipe into a whole, when fluid filled in the pipeline passes through the pipeline throttling element, pressure difference is generated, the pressure is transmitted to two ends of the differential pressure sensor through two pressure guiding nozzles on the throttling element, thereby realizing the pressure measuring function, and finally, the differential pressure signal is converted into a flow value through signal processing and is transmitted to the acquisition system through the electric connector. The utility model has compact structure, small volume of the whole machine, convenient installation and difficult influence of vibration or overload on reliability.
Furthermore, the differential pressure sensor is fixed inside the shell through the sensor mounting seat, the periphery of the differential pressure sensor behind the positive and negative pressure sensing diaphragms is respectively provided with the second sealing ring, and the mounting seat of the differential pressure sensor is matched with the wide-temperature sealing ring, so that the differential pressure sensor and the Venturi tube are quickly and reliably sealed, and the mounting space is saved.
Furthermore, the top of the Venturi tube is provided with an assembly panel, the assembly panel is connected with the bottom of the shell through screws, the electric connector is installed at the top of the shell through a support, the support is connected with the top of the shell through screws, the whole machine is installed in a split mode, and the split type installation mode has the advantages of being strong in interchangeability and high in maintainability.
Drawings
FIG. 1 is a front view of the internal structure of a differential pressure flowmeter based on venturi tube pressure measurement according to the present invention;
FIG. 2 is a top view of the external structure of the differential pressure flowmeter based on venturi tube pressure measurement according to the present invention;
FIG. 3 is a schematic view of the screw connection between the venturi and the housing of the present invention;
in the drawings: 1-venturi tube; 2-a first sealing ring; 3-a sensor mount; 4-a circuit board; 5-differential pressure sensor; 6-a second sealing ring; 7-an electrical connector; 8-a first screw; 9-a housing; 10-a second screw; 11-third screw.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the differential pressure flowmeter based on venturi tube pressure measurement of the present invention comprises a housing 9, an electrical connector 7 is arranged on the top of the housing 9, the electrical connector 7 is mounted on the top of the housing 9 through a support, and the support and the top of the housing 9 are connected by a first screw 8, as shown in fig. 2. The bottom of the shell 9 is connected with the venturi tube 1, the top of the venturi tube 1 is provided with an assembly panel, and the assembly panel is connected with the bottom of the shell 9 by screws, wherein the screws comprise second screws 10 which are downwards connected with the assembly panel of the venturi tube 1 by four corners of the shell 9 and third screws 11 which are upwards connected with the shell 9 by the assembly panel of the venturi tube 1, as shown in fig. 3. A differential pressure sensor 5 and a circuit board 4 are provided inside the casing 9, and the differential pressure sensor 5 is fixed inside the casing 9 by a sensor mount 3. And the positive and negative pressure sensing diaphragms of the differential pressure sensor 5 are respectively communicated with pipelines in front of and behind the throat neck of the Venturi tube 1 through sealing channels, two sealing channels are arranged on the sensor mounting seat 3, the pipelines in front of and behind the throat neck of the Venturi tube 1 are inserted and mounted at one ends of the two sealing channels through leading-out interfaces, and the other ends of the two sealing channels are opposite to the positive and negative pressure sensing diaphragms of the differential pressure sensor 5. The periphery of the leading-out interface is provided with a first sealing ring 2, and the leading-out interface is connected with one end of the sealing channel in a sealing mode through the first sealing ring 2. The differential pressure sensor 5 is provided with second seal rings 6 on the outer periphery behind the positive and negative pressure sensing diaphragms, respectively. The collected signal of the differential pressure sensor 5 is transmitted to the circuit board 4, the circuit board 4 is provided with a signal amplifier, and the collected signal of the differential pressure sensor 5 is amplified through the signal amplifier. The circuit board 4 is connected with the electric connector 7 through a lead, and signal output is realized through the electric connector 7. The peripheries of two ends of the Venturi tube 1 are processed with threads.
In the above embodiment, since the pipe leading-out interfaces before and after the throat of the venturi tube 1 are cylindrical, the leading-out interfaces are inserted into two sealing passages which are also cylindrical, and the outer periphery of the differential pressure sensor 5 behind the positive and negative pressure sensing diaphragm is also cylindrical, the first sealing ring 2 and the second sealing ring 6 which are used are both O-shaped sealing rings.
When fluid passes through a pipeline (namely a Venturi tube 1) with a throttling element, pressure is led out through a pressure leading nozzle (namely a leading-out interface) through pressure leading holes in front of and behind the throttling element of the pipeline, then a sensor mounting seat 3 provided with a differential pressure sensor 5 is mounted on a bottom plate (namely an assembly panel) of the throttling element, the pressure leading nozzle and the sensor mounting seat 3 are sealed through an O-shaped sealing ring (a first sealing ring 2) to prevent pressure leakage, the sensor mounting seat 3 is fixed on the throttling element through a screw hole in the bottom plate of the throttling element, when pressure difference between the front part and the rear part of the throttling element is transmitted to the differential pressure sensor 5 through the pressure leading nozzle, a differential pressure signal is converted into an electric signal through the differential pressure sensor 5, and the electric signal is amplified and converted into a flow signal through a signal processing circuit on a circuit board 4 The pressure loss is small.
The specific assembly process of the utility model is as follows:
after the threads at the two ends of the Venturi tube 1 and the pipeline are installed and fixed, when fluid medium passes through the Venturi tube 1, local contraction is formed at the throat part of the Venturi tube 1, so that the flow rate is increased, the static pressure is reduced, and then differential pressure is generated at the front and the back of the throat part of the pipeline, the pressure at the front end is transmitted to a positive pressure sensing diaphragm of a differential pressure sensor 5 which is installed on a sensor installation seat 3 and sealed with a first sealing ring 2 through a leading-out interface integrated on the Venturi tube 1, the pressure at the rear end is also transmitted to a negative pressure sensing diaphragm of the differential pressure sensor 5 which is installed on the sensor installation seat 3 and sealed with the first sealing ring 2 through the leading-out interface integrated on the Venturi tube 1, the differential pressure sensor 5 forms sealing with the sensor installation seat 3 through a second sealing ring 6, and the sensor installation seat 3 forms fixed connection with the Venturi tube 1 through a third screw 11, the differential pressure sensor 5 transmits signals to the circuit board 4 for amplification, the converted signals are transmitted to the electric connector 7 fixed on the shell 9 and output to the acquisition system, and finally the shell 9 and the venturi tube 1 are protected and assembled through the second screw 10.
The utility model can avoid unreliable or pressure leakage caused by secondary pressure-inducing connection of the pressure-inducing pipeline, the differential pressure sensor 5 and the Venturi tube 1 can be quickly and reliably sealed, the installation space is saved, and the shell 9, the Venturi tube 1 and the electric connector 7 adopt a split installation mode, thus having the advantages of strong interchangeability and high maintainability.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. The utility model provides a differential pressure flowmeter based on venturi is got pressure which characterized in that: including casing (9), the top of casing (9) is provided with electric connector (7), and venturi (1) is connected to the bottom of casing (9), and the inside of casing (9) is provided with differential pressure sensor (5) and circuit board (4), the positive and negative pressure response diaphragm of differential pressure sensor (5) communicates through the pipeline around the throat of sealed passageway and venturi (1) respectively, and circuit board (4) are given in the acquisition signal transmission of differential pressure sensor (5), circuit board (4) link to each other with electric connector (7) through the wire, realize signal output through electric connector (7).
2. The venturi-based pressure differential flow meter of claim 1, wherein: the differential pressure sensor (5) is fixed inside the shell (9) through the sensor mounting seat (3).
3. The venturi-based pressure differential flow meter of claim 2, wherein: two sealed channels are arranged on the sensor mounting seat (3), pipelines in front of and behind the throat neck of the Venturi tube (1) are inserted into one ends of the two sealed channels through leading-out interfaces, and the other ends of the two sealed channels are opposite to the positive and negative pressure sensing diaphragms of the differential pressure sensor (5).
4. The venturi-based pressure differential flow meter of claim 3, wherein: the periphery of the leading-out interface is provided with a first sealing ring (2), and the leading-out interface is connected with one end of the sealing channel in a sealing mode through the first sealing ring (2).
5. The venturi-based pressure differential flow meter of claim 2, wherein: and the differential pressure sensor (5) is provided with a second sealing ring (6) at the periphery behind the positive and negative pressure sensing diaphragm respectively.
6. The venturi-based pressure differential flow meter of claim 1, wherein: the top of the Venturi tube (1) is provided with an assembly panel, and the assembly panel is connected with the bottom of the shell (9) through screws.
7. The venturi-based pressure differential flow meter of claim 1, wherein: the electric connector (7) is arranged on the top of the shell (9) through a support, and the support is connected with the top of the shell (9) through screws.
8. The venturi-based pressure differential flow meter of claim 1, wherein: the circuit board (4) is provided with a signal amplifier, and the signal amplifier amplifies the collected signal of the differential pressure sensor (5).
9. The venturi-based pressure differential flow meter of claim 1, wherein: the peripheries of two ends of the Venturi tube (1) are processed with threads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121914668.9U CN215448061U (en) | 2021-08-16 | 2021-08-16 | Differential pressure flowmeter based on venturi tube pressure tapping |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121914668.9U CN215448061U (en) | 2021-08-16 | 2021-08-16 | Differential pressure flowmeter based on venturi tube pressure tapping |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215448061U true CN215448061U (en) | 2022-01-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121914668.9U Active CN215448061U (en) | 2021-08-16 | 2021-08-16 | Differential pressure flowmeter based on venturi tube pressure tapping |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215448061U (en) |
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2021
- 2021-08-16 CN CN202121914668.9U patent/CN215448061U/en active Active
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