CN209992027U - Plug-in pitot tube flowmeter - Google Patents

Abstract

The application discloses bayonet pitot tube flowmeter, including transition piece, pressure pipe and pressure taking part. The inner cavity of the pitot tube flowmeter pressure guiding tube is used as a pressure transmission channel, so that the width of the pressure transmission channel of the pressure guiding tube is increased, the technical problem that the pressure guiding tube is easy to block is solved, and meanwhile, the production cost of the pitot tube flowmeter is also reduced.

Description

Plug-in pitot tube flowmeter

Technical Field

The utility model belongs to the technical field of the flow measurement, concretely relates to bayonet pitot tube flowmeter.

Background

Differential pressure flow meters are meters that measure flow based on the differential pressure generated by a flow sensing member installed in a pipe, known fluid conditions, and the geometry of the sensing member and the pipe. The differential pressure flowmeter consists of a primary device (detection part) and a secondary device (differential pressure conversion and flow display instrument). Differential pressure flow meters are generally classified in the form of test pieces, such as orifice plate flow meters, venturi flow meters, pitot tube flow meters, and the like. The secondary installation is various mechanical, electronic and electromechanical integrated differential pressure meters, differential pressure transmitters and flow display and calculation instruments, and the secondary installation is developed into a large class of instruments with high degree of three types (serialization, universalization and standardization) and various specifications. The differential pressure gauge can be used to measure both flow parameters and other parameters (e.g., pressure, level, density, etc.). Among them, the pitot tube flowmeter is a typical differential pressure type flow sensor, and is a plug-in type flow meter which estimates the flow by the central flow velocity on a straight line in a side pipeline. The pressure guiding pipe comprises an outer pipe, a high-pressure pipe and a low-pressure pipe, wherein the high-pressure pipe and the low-pressure pipe are arranged in the inner cavity of the outer pipe. In practical use of the pitot tube flowmeter, the pressure guide tube is easy to block, and the measurement precision of the pitot tube flowmeter is further influenced.

Disclosure of Invention

The technical problem that this application mainly solved is the technical problem that blocking phenomenon easily appears in pitot tube flowmeter's induced pressure pipe.

According to a first aspect, an embodiment provides an insertion pitot tube flow meter comprising a transition piece 11, a pressure introduction pipe and a pressure taking piece 2;

the pressure guide pipe is connected between the transition piece 11 and the pressure taking and pressing piece 2; the pressure guiding pipe is used for transmitting the pressure of the measured fluid borne by the pressure taking and pressing part 2 to the transition part 11;

the pressure guide pipe comprises a first pressure guide pipe 15 and a second pressure guide pipe 9; the second pressure guide pipe 9 is arranged in the inner cavity of the first pressure guide pipe 15;

a first channel and a second channel are arranged in the transition piece 11;

the pressure taking and pressing piece 2 is provided with a first pressure taking hole 8 and a second pressure taking hole 12; the first pressure taking hole 8 is communicated with a first channel in the transition piece 11 through the second pressure leading pipe 9;

the second pressure taking hole 12 is communicated with a second channel in the transition piece 11 through an inner cavity of the first pressure leading pipe 15.

Further, the cross section of the first pressure guiding pipe 15 is annular; and/or the section of the second pressure leading pipe 9 is annular.

Further, the second low pressure taking hole 12 is a low pressure hole; the pressure taking and pressing part 2 comprises two communicated low-pressure holes.

Further, the two conducted low-pressure holes are respectively arranged on two sides of the first pressure taking hole 8.

Furthermore, the cross section of the pressure taking and pressing piece 2 is bullet-shaped and is of an integrated double-cavity structure.

Further, a sealing ring is arranged between the pressure guiding pipe and the transition piece 11; and/or a sealing ring is arranged between the pressure guiding pipe and the pressure taking and pressing part 2.

Further, the first pressure taking hole 8 is used for taking the high pressure of the measured fluid; the second pressure guiding pipe 9 is used for transmitting the high pressure of the measured fluid.

Further, differential pressure transmitter 6 is included and is connected to the first and second passages of transition piece 11.

Further, a stop valve 5 is provided between the differential pressure transmitter 6 and the first and second passages of the transition piece 11.

Further, the stop valve 5 is an electromagnetic valve.

According to the plug-in pitot tube flowmeter, the inner cavity of the pressure guiding pipe of the pitot tube flowmeter is used as the low-pressure pipe or the high-pressure pipe, so that the width of a transmission channel of the low-pressure pipe or the high-pressure pipe is increased, the technical problem that the pressure guiding pipe is easy to block is solved, and meanwhile, the production cost of the pitot tube flowmeter is reduced.

Drawings

FIG. 1 is a schematic diagram of a system configuration for a Pitot tube flowmeter;

FIG. 2 is a schematic diagram of a fluid conduit of a pitot tube flow meter;

FIG. 3 is a schematic cross-sectional view of a pressure-inducing tube of a pitot tube flowmeter;

FIG. 4 is a schematic diagram of a pressure manifold connection for an embodiment of a pitot tube flowmeter;

FIG. 5 is a schematic cross-sectional view of an impulse line of an embodiment of a pitot tube flowmeter;

fig. 6 is a schematic structural diagram of a pressure tapping piece of a pitot tube flowmeter according to an embodiment.

Detailed Description

The present application will be described in further detail below with reference to the accompanying drawings by way of specific embodiments. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.

Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.

The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).

As shown in fig. 1, the system structure of a pitot tube flowmeter is schematically illustrated, and includes a measured fluid pipeline 1, a pressure taking part 2, a lower connecting flange 3, a pressure guiding pipe 4, a stop valve 5, a differential pressure transmitter 6, a flowmeter calculator 7, a balance valve 10, a transition part 11 and an upper connecting flange 14. The pitot tube flowmeter is fixedly connected with a lower connecting flange 3 on a measured fluid pipeline 1 through an upper connecting flange 14, and a pressure taking and pressing piece 2 is inserted into the pipeline. The pressure taking and pressing piece 2 is connected with the transition piece 11 through a pressure guiding pipe. Transition piece 11 is connected with differential pressure transmitter 6 through two pressure pipe 4, is provided with stop valve 5 on every pressure pipe 4, is provided with balanced valve 10 between two pressure pipe 4. The flow calculator 7 obtains a display value of the flowmeter based on data of the differential pressure transmitter 6.

Fig. 2 is a schematic structural diagram of a fluid pipeline of a pitot tube flowmeter, which includes a high-pressure hole 8, a high-pressure pipe 9, a low-pressure hole 12, a low-pressure pipe 13 and a pressure-leading pipe 15. The pressure taking and pressing piece 2 is connected with the transition piece 11 through a pressure guiding pipe 15. The high-pressure hole 8 on the pressure taking part 2 is in conduction connection with the high-pressure pipe 9, and the low-pressure hole 12 on the pressure taking part 2 is in conduction connection with the low-pressure pipe 13. The high-pressure pipe 9 and the low-pressure pipe 13 are arranged in the inner cavity of the pressure guide pipe 15.

Fig. 3 is a schematic cross-sectional view of a pressure guiding pipe of a pitot tube flowmeter, which includes a high-pressure pipe 9, a low-pressure pipe 13 and a pressure guiding pipe 15.

The fluid filled in the measured fluid pipeline 1 enters the pressure taking and pressing part 2 of the throttling device through the straight pipeline, the flow velocity is contracted at the pressure taking and pressing part 2, the flow velocity is accelerated, the static pressure is reduced, and differential pressure is generated in front of and behind the pressure taking and pressing part 2. Since the flow velocity increases and the differential pressure increases, the flow rate can be determined by measuring the differential pressure. The pressure taking and pressing piece 2 is provided with two pressure taking ports, one is an upstream pressure taking port, the other is a downstream pressure taking port, the upstream pressure taking port leads out positive pressure of fluid, and the downstream pressure taking port leads out negative pressure of the fluid. The differential pressure transmitter 6 is an important component of the differential pressure flowmeter, and converts a differential pressure signal of a throttling device into a current signal so as to facilitate secondary instrument processing and operation. The flow calculator 7 calculates and calculates the standard current signal generated by the differential pressure transmitter and the compensation signal generated by other devices, and displays the instantaneous flow, the accumulated flow and other flows. The pressure in the high-pressure pipe 9 is higher than the pressure in the low-pressure pipe 13, and the high-pressure pipe and the low-pressure pipe are limited by the size, so that the diameter of the high-pressure pipe and the low-pressure pipe is small, the high-pressure pipe and the low-pressure pipe are easy to block, and the measurement accuracy of the pitot-tube flowmeter is further influenced.

The utility model discloses an in the embodiment, the inner chamber that adopts the pressure tube is used as the low-voltage tube, because of increased the passageway of transmission low pressure, and then reduces the phenomenon that the low-voltage tube is blockked up. Meanwhile, the production cost of the pressure guiding pipe is reduced.

The first embodiment is as follows:

referring to fig. 4, a schematic diagram of a pressure guiding pipe connection of an embodiment of a pitot tube flowmeter includes a transition piece 11, a pressure guiding pipe, and a pressure sampling piece 2. The pressure guiding pipe is connected between the transition piece 11 and the pressure taking piece 2. The pressure guiding pipe is used for transmitting the pressure of the measured fluid borne by the pressure taking part 2 to the transition part 11. The pressure guiding pipe comprises a first pressure guiding pipe 15 and a second pressure guiding pipe 9, and the second pressure guiding pipe 9 is arranged in the inner cavity of the first pressure guiding pipe 15. A first passage and a second passage are provided in the transition piece 11. The pressure taking and pressing piece 2 is provided with a first pressure taking hole 8 and a second pressure taking hole 12. The first pressure tapping hole 8 communicates with a first passage in the transition piece 11 via a second pressure tapping pipe 9. The second pressure taking hole 12 is communicated with a second channel in the transition piece 11 through the inner cavity of the first pressure leading pipe 15. In one embodiment, the second pressure introduction pipe 9 is a high pressure pipe for transmitting a high pressure of the fluid to be measured. The first and second passages of the transition piece 11 are high-pressure and low-pressure passages, respectively. The first pressure taking hole 8 and the second pressure taking hole 12 on the pressure taking part 2 are a high-pressure hole and a low-pressure hole respectively. The high-pressure hole is used for taking the high pressure of the measured fluid and is communicated with the high-pressure channel in the transition piece 11 through a high-pressure pipe. The low pressure port communicates with the low pressure passage in the transition piece 11 through the interior of the first impulse pipe 15. In one embodiment, a sealing ring is disposed between the first pressure guiding pipe 15 and the transition piece 11, and a sealing ring is disposed between the first pressure guiding pipe 15 and the pressure taking piece 2 for sealing. In one embodiment, the first pressure guiding pipe 15 is hermetically connected with the transition piece 11 and the pressure taking piece 2 through laser welding.

Referring to fig. 5, a cross-sectional view of a pressure guiding tube of a pitot tube flowmeter in an embodiment is shown, in which the first pressure guiding tube 15 and the second pressure guiding tube 9 are both circular tubes, i.e., the cross-section is circular.

Referring to fig. 6, which is a schematic structural diagram of a pressure measuring device of an embodiment of a pitot tube flowmeter, a first pressure measuring hole 8 is a high pressure hole, and a second pressure measuring hole 12 is a low pressure hole. The pressure taking and pressing piece 2 is provided with two communicated low-pressure holes. The two conducted low-voltage holes are respectively arranged at two sides of the high-voltage hole. The cross section of the pressure taking and pressing piece 2 is bullet-shaped and is of an integrated double-cavity structure. In one embodiment, the pitot tube flowmeter further includes a differential pressure transmitter 6 and is coupled to the first and second passages of the transition piece 11. In one embodiment, differential pressure transmitter 6 is connected to the high pressure and low pressure passages of transition piece 11 via two impulse pipes 4. Each pressure pipe 4 is provided with a stop valve 5. In one embodiment, the stop valve 5 is a solenoid valve.

The application discloses bayonet pitot tube flowmeter, including transition piece, pressure pipe and pressure taking part. The inner cavity of the pressure guiding pipe of the pitot tube flowmeter is used as a channel for pressure transmission of the measured fluid, so that the width of the low-force transmission channel is increased, the technical problem that the pressure guiding pipe is easy to block is solved, and meanwhile, the production cost of the pitot tube flowmeter is also reduced.

The present application has been described with reference to specific examples, which are provided only to aid understanding of the present application and are not intended to limit the present application. For a person skilled in the art to which the application pertains, several simple deductions, modifications or substitutions may be made according to the idea of the application.

Claims (10)

1. An inserted pitot tube flowmeter is characterized by comprising a transition piece (11), a pressure leading pipe and a pressure taking piece (2);

the pressure guiding pipe is connected between the transition piece (11) and the pressure taking and pressing piece (2); the pressure guiding pipe is used for transmitting the pressure of the measured fluid borne by the pressure taking and pressing piece (2) to the transition piece (11);

the pressure guiding pipe comprises a first pressure guiding pipe (15) and a second pressure guiding pipe (9); the second pressure guide pipe (9) is arranged in the inner cavity of the first pressure guide pipe (15);

a first channel and a second channel are arranged in the transition piece (11);

the pressure taking and pressing piece (2) is provided with a first pressure taking hole (8) and a second pressure taking hole (12); the first pressure taking hole (8) is communicated with a first channel in the transition piece (11) through the second pressure leading pipe (9);

the second pressure taking hole (12) is communicated with a second channel in the transition piece (11) through an inner cavity of the first pressure leading pipe (15).

2. The flowmeter according to claim 1, characterized in that said first tapping pipe (15) has a circular cross-section; and/or the section of the second pressure guide pipe (9) is annular.

3. The flowmeter of claim 1, wherein said second pressure tap (12) is a low pressure tap; the pressure taking and pressing piece (2) comprises two communicated low-pressure holes.

4. A meter according to claim 3, wherein said two conducting low pressure ports are arranged on either side of said first pressure tapping (8).

5. The flowmeter as set forth in claim 4, characterized in that said pressure-taking member (2) is bullet-shaped in cross section and has an integrated double-chamber structure.

6. The flowmeter of claim 1, characterized in that a sealing ring is arranged between the pressure guiding pipe and the transition piece (11); and/or a sealing ring is arranged between the pressure guiding pipe and the pressure taking and pressing part (2).

7. The flowmeter of claim 6, wherein the first pressure tapping hole (8) is used for tapping the high pressure of the measured fluid; the second pressure leading pipe (9) is used for transmitting the high pressure of the fluid to be measured.

8. The flowmeter of claim 1, further comprising a differential pressure transmitter (6) and connected to the first and second passages of the transition piece (11).

9. The flowmeter of claim 8, characterized in that a shut-off valve (5) is arranged between the differential pressure transmitter (6) and the first and second channels of the transition piece (11).

10. A meter as claimed in claim 9, characterized in that said shut-off valve (5) is a solenoid valve.

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