CN216621280U

CN216621280U - Balanced type total pressure flowmeter

Info

Publication number: CN216621280U
Application number: CN202123368460.4U
Authority: CN
Inventors: 张丁文; 张军
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2022-05-27
Anticipated expiration: 2031-12-29

Abstract

The utility model relates to the technical field of flowmeters, in particular to a balanced type full-pressure flowmeter. The balanced type full-pressure flowmeter comprises a porous balance plate core, a positive pressure pipe and a negative pressure pipe; the porous balance plate core is provided with a porous structure; the positive pressure pipe is positioned on the front side of the porous balance plate core, and the negative pressure pipe is positioned on the back side of the porous balance plate core; the front surface of the porous balance plate core is a fluid incoming surface, and the front surface of the porous balance plate core is a positive pressure detection surface; the back of the porous balance plate core is a fluid outgoing surface, and the back of the porous balance plate core is a negative pressure detection surface. The throttling action of the fluid when the fluid passes through the porous balance plate core enables the hydrostatic pressure difference on two sides of the porous balance plate to be increased, so that the flow differential pressure value generated by the fluid is the hydrostatic pressure difference generated by the balance plate plus the dynamic pressure difference generated by the fluid impact detection surface. The differential pressure value is the sum of dynamic pressure and static pressure, so the differential pressure value is higher under the same working condition, and the measurement precision is higher.

Description

Balanced type total pressure flowmeter

Technical Field

The utility model relates to the technical field of flowmeters, in particular to a balanced type full-pressure flowmeter.

Background

Among the existing flowmeters, the orifice plate flowmeter has the advantages of convenient processing, large differential pressure value and high precision. However, the installation is inconvenient, especially in large pipelines, and the existing orifice plate flowmeter needs to cut off the pipeline during the installation process and then install the orifice plate flowmeter.

The bar-type flowmeter has the characteristics of convenience in installation, but the differential pressure is too low, and the precision is low.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a balanced type total pressure flowmeter which can solve the problems of inconvenient installation and low precision;

the utility model provides a balanced type total pressure flowmeter, which comprises a porous balance plate core, a positive pressure pipe and a negative pressure pipe;

the porous balance plate core is provided with a porous structure;

the positive pressure pipe is positioned on the front side of the porous balance plate core, and the negative pressure pipe is positioned on the back side of the porous balance plate core;

the front surface of the porous balance plate core is a fluid incoming surface, and the front surface of the porous balance plate core is a positive pressure detection surface;

the back of the porous balance plate core is a fluid outgoing surface, and the back of the porous balance plate core is a negative pressure detection surface.

Preferably, the porous balance plate core is provided with a flow velocity detection hole;

the positive pressure pipe is used for taking pressure on the porous balance plate core or taking pressure at the flow rate detection hole.

Preferably, the positive pressure pipe is attached to the positive pressure detection surface, and the negative pressure pipe is attached to the negative pressure detection surface;

the positive pressure measuring port of the positive pressure pipe is positioned at a position half of the distance between the outer edge of the porous balance plate core and the outer edge of the flow speed detecting hole;

the negative pressure measuring port of the negative pressure pipe is arranged at a position lower than the outer edge of the flow detecting hole of the positive pressure measuring port, or the negative pressure measuring port is arranged at a position flush with the outer edge of the flow detecting hole.

Preferably, the balanced type total pressure flowmeter comprises a columnar probe, and the section of the columnar probe is hexagonal;

a positive pressure pipe and a negative pressure pipe are arranged in the columnar probe;

the lower end part of the columnar probe is provided with a diagonal plane, and an opening of the positive pressure pipe on the diagonal plane is a positive pressure tapping opening;

the bottom surface of the columnar probe is a negative pressure taking surface, and the negative pressure taking port of the negative pressure pipe is positioned on the negative pressure taking surface.

Preferably, the porous balance plate core is also provided with a rectifying hole;

the rectification hole is positioned on two sides of the negative pressure pipe close to the negative pressure measuring port.

Preferably, a plurality of balancing holes which are uniformly distributed by taking the center of the balancing plate core as the circle center are formed in the porous balancing plate core.

Preferably, the porous balance plate core is installed in the fluid pipeline, and a gap exists between the edge of the porous balance plate core and the inner wall of the fluid pipeline.

Preferably, the porous balance plate core is installed in the fluid pipeline, and the edge of the porous balance plate core is in contact with the inner wall of the fluid pipeline.

Preferably, a protection pipe is arranged on the porous balance plate core, and extends from the outer wall of the fluid pipeline to a positive pressure pipe and a negative pressure pipe pressure taking port in the pipeline;

the positive pressure pipe and the negative pressure pipe are led out of the fluid pipeline through the protection pipe;

the porous balance plate core, the positive pressure pipe, the negative pressure pipe and the protection pipe are of an integrated structure, or the positive pressure pipe, the negative pressure pipe, the probe rod and the columnar probe are arranged into an integrated flowmeter probe, and the flowmeter probe can be inserted into and plugged into the protection pipe.

Preferably, the central area of the porous balance plate core is of a plate-shaped structure, and the positive pressure tapping and the negative pressure tapping extend to the central position of the porous balance plate core respectively.

Has the advantages that:

when the balanced type total pressure flowmeter provided by the embodiment is used, fluid flowing continuously meets a porous balance plate core arranged in a pipeline, and the porous balance plate core plays a throttling role. The flow cross section area of the porous balance plate core is smaller than that of the pipeline, so that the flow area of the fluid is suddenly reduced, the flow velocity of the fluid is increased under the action of pressure, the static pressure of the fluid on the surface of the balance plate core is reduced, and the flow velocity of the fluid is reduced due to the throttling of the balance plate core when the balance plate core faces to the side, so that the static pressure of the fluid is increased. And forming a static pressure difference delta P (P1-P2), wherein P1 is the static pressure before the porous balance plate core, and P2 is the static pressure after the porous balance plate core. This is the working principle of the orifice plate, i.e. the porous balancing plate core of the present invention utilizes the throttling principle. The positive pressure detection surface is arranged facing the fluid, and the fluid impacts the positive pressure detection surface facing the fluid when flowing in the fluid flowing process, so that a dynamic pressure is formed. Therefore, the flow differential pressure is: and the flow differential pressure deltap is equal to the static pressure difference deltap of the balance plate core and the hydrodynamic pressure. The flow differential pressure can be obtained after temperature and pressure compensation calculation, namely, the full pressure difference is generated through the combined action of the throttling action of the porous balance plate core and the dynamic pressure generated by the fluid impact detection surface, so that the balanced full pressure flowmeter has higher flow differential pressure value and measurement precision.

Drawings

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

Fig. 1 is a schematic structural diagram of a balanced type total pressure flowmeter (a gap exists between a porous balance plate core and a fluid pipeline) according to an embodiment of the present invention, where fig. 1a is a left side view of the balanced type total pressure flowmeter, and fig. 1b is a top view of the balanced type total pressure flowmeter; FIG. 1c is a top view of FIG. 1b taken along line A-A;

fig. 2 is a schematic structural diagram of a balanced type total pressure flow meter (there is no gap between the porous balance plate core and the fluid pipeline), where fig. 2a is a left side view of the balanced type total pressure flow meter, and fig. 2b is a top view of the balanced type total pressure flow meter; FIG. 2c is a cross-sectional view taken along line A-A of the top view of FIG. 2 b;

FIG. 3 is a schematic structural diagram of a balanced type full pressure portable mounting flowmeter according to an embodiment of the present invention (the porous balance plate core is circular); wherein, fig. 3a is a left side view of the balanced type full pressure portable mounting flowmeter, and fig. 3b is a top view of the balanced type full pressure portable mounting flowmeter;

FIG. 3c is a top view, in section taken along line A-A, of FIG. 3 b;

FIG. 4 is a schematic structural diagram of a balanced type full-pressure portable-mount flowmeter according to an embodiment of the present invention (a porous balance plate core is square); wherein, fig. 4a is a left side view of the balanced type full pressure portable installed flow meter, and fig. 4b is a top view of the balanced type full pressure portable installed flow meter;

FIG. 4c is a cross-sectional view taken along line A-A of FIG. 4b from the top view;

fig. 5 is a schematic structural diagram of a balanced type full-pressure flow rate pore pressure measuring flowmeter according to an embodiment of the present invention (a gap exists between a porous balance plate core and a fluid pipeline); wherein, fig. 5a is a left side view of the balanced type full pressure flow rate hole pressure-taking flow meter, and fig. 5b is a top view of the balanced type full pressure flow rate hole pressure-taking flow meter; FIG. 5c is a cross-sectional view taken along line A-A of FIG. 5b as a top view;

fig. 6 is a schematic structural diagram of a balanced type full-pressure flow velocity pore pressure measuring flowmeter according to an embodiment of the present invention (no gap exists between the porous balance plate core and the fluid pipeline); wherein, fig. 6a is a left side view of the balanced type full pressure flow rate hole pressure-taking flow meter, and fig. 6b is a top view of the balanced type full pressure flow rate hole pressure-taking flow meter; FIG. 6c is a cross-sectional view taken along line A-A of FIG. 6b from the top;

FIG. 7 is a diagram of a balanced full-pressure pluggable flowmeter according to an embodiment of the present invention; fig. 7a is a left side view of the balanced type full-pressure pluggable flowmeter, and fig. 7b is a top view of the balanced type full-pressure pluggable flowmeter; FIG. 7c is a cross-sectional view taken along line A-A of FIG. 7b as a top view; FIG. 7d is a schematic view of the structure of the cylindrical probe and the protection tube; FIG. 7e is a schematic view of the structure of the columnar probe and the probe rod; FIG. 7f is a perspective view illustration of a cylindrical probe;

fig. 8 is a schematic structural diagram of a balanced type full-pressure center pressure measurement flowmeter according to an embodiment of the present invention (a gap exists between a porous balanced plate core and a fluid pipeline); wherein, fig. 8a is a left side view of the pressure measuring flowmeter of the balanced type total pressure center pressure measuring flowmeter, and fig. 8b is a top view of the balanced type total pressure center pressure measuring flowmeter; FIG. 8c is a cross-sectional view taken along line A-A of FIG. 8b from the top;

FIG. 9 is a schematic structural diagram of a balanced type full-pressure center pressure-measuring flowmeter according to an embodiment of the present invention (no gap exists between the porous balance plate core and the fluid conduit); wherein, fig. 9a is a left side view of the pressure measuring flowmeter of the balanced type total pressure center pressure measuring flowmeter, and fig. 9b is a top view of the balanced type total pressure center pressure measuring flowmeter; FIG. 9c is a cross-sectional view taken along line A-A of FIG. 9b from above;

FIG. 10 is a schematic structural view of a balanced full-pressure center pressure-sensing portable-mount flowmeter according to an embodiment of the present invention; wherein, fig. 10a is a left side view of the pressure measuring flowmeter of the balance type total pressure center pressure measuring portable mounting flowmeter, and fig. 10b is a top view of the balance type total pressure center pressure measuring portable mounting flowmeter; FIG. 10c is a cross-sectional view taken along line A-A of the top view 10 b.

Description of reference numerals:

1: porous balance plate core, 2: positive pressure pipe, 3: negative pressure pipe, 4: flow rate detection hole, 5: columnar probe, 6: flow-straightening hole, 7: protection tube, 8: fluid pipe, 9: probe rod, 10: seal, 11: balance hole, 12: a limit ring.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1 to 10, the present embodiment provides a balanced total pressure flowmeter including a porous balance plate core 1, a positive pressure pipe 2, and a negative pressure pipe 3.

The porous balance plate core is provided with a porous structure.

The positive pressure pipe 2 is positioned on the front surface of the porous balance plate core 1, and the negative pressure pipe 3 is positioned on the back surface of the porous balance plate core 1.

The front surface of the porous balance plate core 1 is a fluid incoming surface, and the front surface of the porous balance plate core 1 is a positive pressure detection surface.

The back of the porous balance plate core 1 is a fluid outgoing surface, and the back of the porous balance plate core 1 is a negative pressure detection surface.

When the balanced type full-pressure flow meter provided by the embodiment is used, when a continuously flowing fluid meets a porous balance plate core 1 installed in a pipeline, the porous balance plate core 1 plays a role in throttling, so that the static pressure difference on two sides of the porous balance plate is increased, therefore, when the flow meter is provided with a differential pressure design of the orifice plate flow meter, the flow area of the orifice plate fluid can be designed according to working conditions (when the diameter of the orifice plate is larger than beta, the differential pressure value is smaller, when the diameter of the orifice plate is larger than beta, the differential pressure value is larger, when the diameter of the orifice plate is larger than beta, or the diameter of an upstream pipeline under the working condition, when the throat is an opening with the smallest cross-sectional area in a throttling device, namely, the beta value can be designed according to the fluid condition. Since the flow cross-sectional area of the fluid in the porous balance plate core 1 is smaller than the flow cross-sectional area of the pipe, the flow area of the fluid is suddenly reduced, and the flow velocity of the fluid is increased under the pressure action, the flow velocity is increased, and the static pressure is reduced. Meanwhile, the hydrostatic pressures at the pipe walls before and after the porous balance plate core 1 are different, and a static pressure difference Δ P (Δ P is P1-P2) is formed, wherein P1 is the hydrostatic pressure before the porous balance plate core 1, and P2 is the hydrostatic pressure after the porous balance plate core 1. This is the working principle of the orifice plate, i.e. the perforated balanced wick 1 of the present invention, which utilizes the throttling principle. The positive pressure detection surface is arranged facing the fluid, and the fluid impacts the positive pressure detection surface facing the fluid when flowing in the fluid flowing process, so that a dynamic pressure is formed. Therefore, the flow differential pressure is: and the flow differential pressure deltap is equal to the static pressure difference deltap of the balance plate core and the hydrodynamic pressure. The fluid of the negative pressure pipe 3 on the detection surface is only static pressure on the going side, so the impact of the static pressure pipe forms dynamic pressure differential pressure on the positive pressure taking pipe and the negative pressure taking pipe, and the working principle of the pressure differential. The flow differential pressure of the positive pressure pipe 2 and the negative pressure pipe 3 can be calculated through temperature and pressure compensation to obtain a flow value, namely, the flow differential pressure value generated by the balanced type total pressure flowmeter is increased by one dynamic pressure compared with a pore plate flowmeter, and is higher than the differential pressure value of the pore plate with the same working condition and the same diameter, so that the measurement precision is higher.

The porous balance plate core 1 is provided with a flow velocity detection hole 4 according to the central position, and is divided into two structural forms: one is that the center of the porous balance plate core 1 is provided with a flow velocity detection hole 4 (as shown in fig. 1 to 7, the flow velocity detection holes 4 are all present on the porous balance plate core 1 shown in the above figures), and the other is that the porous balance plate core 1 has no flow velocity detection hole 4 (as shown in fig. 8 to 10, the flow velocity detection holes 4 are all present on the porous balance plate core 1 shown in the above figures).

The specific structure of the flow velocity detection hole 4 arranged at the center of the porous balance plate core 1 is as follows:

the center of the porous balance plate core 1 is provided with a flow velocity detection hole 4. In the case of this structure, there are two main forms of pressure extraction: the positive pressure pipe 2 takes pressure on the porous balance core 1 (fig. 1 to 4 show the pressure on the porous balance core 1) or takes pressure in the flow rate detection hole 4 (fig. 5 to 7 show the pressure in the flow rate detection hole 4).

Regardless of the type of the porous balance plate core 1 or the pressure measurement method, the positive pressure pipe 2 is located in front of the porous balance plate core 1, and the negative pressure pipe 3 is located behind the porous balance plate core 1.

Referring to fig. 1 to 4, when the positive pressure pipe 2 takes pressure on the porous balance core 1.

The positive pressure pipe 2 is attached to the positive pressure detection surface, and the negative pressure pipe 3 is attached to the negative pressure detection surface.

The positive pressure measuring port of the positive pressure pipe 2 is positioned at the position half of the distance between the outer edge of the porous balance plate core 1 and the outer edge of the flow speed detecting hole 4.

The setting position of the negative pressure measuring port of the negative pressure pipe 3 is lower than that of the positive pressure measuring port and higher than the outer edge of the flow detection hole, or the setting position of the negative pressure measuring port is flush with the outer edge of the flow detection hole.

Referring to fig. 5 to 7, when the positive pressure pipe 2 takes pressure at the flow rate detection hole 4:

the balanced total pressure flowmeter comprises a columnar probe 5. A positive pressure pipe 2 and a negative pressure pipe 3 are arranged in the columnar probe 5.

The lower end part of the columnar probe 5 is provided with a diagonal plane, and the opening of the positive pressure pipe 2 on the diagonal plane is a positive pressure taking opening.

The bottom surface of the columnar probe 5 is a negative pressure taking surface, and the negative pressure taking surface of the negative pressure pipe 3 is positioned on the negative pressure taking surface.

Specifically, the columnar probe 5 is a hexagonal prism probe. Beveling the upper part of one edge downwards at an angle of 15-45 degrees with the axis until the angle is 2-3 mm away from the axis to form a positive pressure taking surface, and opening the positive pressure taking opening; the bottom surface of the lower part of the inclined surface, which is intersected with the cross section of the hexagonal prism, is a negative pressure detection surface, and a negative pressure taking opening is arranged at the negative pressure detection surface. The negative pressure sensing face is parallel to the direction of fluid flow and is at 90 ° to the axis of the probe.

The flow velocity detection hole 4 is used for detecting the negative pressure of the fluid, and is a balanced core plate center flow velocity detection hole 4 mode, so that the flow velocity detection hole has the representativeness of the pipeline flow velocity. The center of the flow velocity detection hole 4 has the fastest flow velocity, the flow detection differential pressure value is larger, and the precision is higher, so the negative pressure taking port is preferably designed near the center line of the flow velocity detection hole 4.

Referring to fig. 1 to 4, the porous balance plate core 1 is further provided with rectification holes 6, and the rectification holes 6 are located on two sides of the negative pressure pipe 3 close to the negative pressure measurement port. The rectifying holes 6 are arranged on two sides of the negative pressure pipe 3, so that the fluid is prevented from forming a vortex after a negative pressure taking port, and the measurement precision is ensured. It should be noted that: when the fluid flow rate is low or the differential pressure value is too low, the design of the flow-regulating hole 6 can be eliminated to increase the static pressure difference.

Referring to fig. 3, 4 and 10, the flowmeter further comprises a protection pipe 7, wherein the protection pipe 7 extends from the outer wall of the fluid pipeline 8 to the position near the pressure taking port of the positive pressure pipe 2 and the negative pressure pipe 3 in the pipeline, the positive pressure pipe 2 and the negative pressure pipe 3 are led out of the fluid pipeline 8 through the protection pipe 7, and the porous balance plate core 1, the positive pressure pipe 2, the negative pressure pipe 3 and the protection pipe 7 are combined into a whole, so that the flowmeter is convenient to carry and install. The porous balance plate core is installed in a fluid pipeline 8 on site, the center of the porous balance plate core 1 is coincided with the center of the fluid pipeline 8, the angle between the porous balance plate core 1 and the axis of the pipeline is 90 degrees, and the protection pipe 7 is combined with the fluid pipeline 8 to play a role in fixing the porous balance plate core 1.

Referring to fig. 7, the balanced total pressure flowmeter includes a pluggable flowmeter probe, which is pluggable into the protection pipe 7, as described below:

referring to fig. 7e, the probe of the balance full-voltage pluggable flowmeter is an integrated structure formed by combining a positive pressure pipe 2, a negative pressure pipe 3, a probe rod 9 and a columnar probe 5.

Wherein, the columnar probe 5 is arranged at one end of the probe rod 9, and the positive pressure pipe 2 and the negative pressure pipe 3 penetrate through the columnar probe 5 and the probe rod 9.

The probe 5 is preferably of a regular hexagonal prism structure, is obliquely cut downwards at an angle of 15-45 degrees with the axis at the upper part of one edge to the position of 2-3 mm of the axis and is a positive pressure detection surface, and a positive pressure tapping opening is formed at the positive pressure detection surface; the cross section of the lower part of the inclined plane and the cross section of the hexagonal prism is a negative pressure detection surface, and a negative pressure taking opening is formed in the negative pressure detection surface. The negative pressure sensing face is parallel to the direction of fluid flow and is at 90 to the probe axis.

The pluggable probe is inserted into the protection tube 7, the lower opening of the protection tube 7 of the pluggable probe is used for enabling the detection head of the pluggable probe to enter the flow velocity detection hole 4 through the opening in the lower portion of the protection tube 7, and the limiting ring 12 is arranged at the lower opening and used for limiting the inserting position of the pluggable probe.

The upper part of the protection tube 7 is provided with a sealing element 10 for sealing between the pluggable probe and the protection tube 7; the porous balance core 1 is integrated with the protection pipe 7. A fluid pipeline 8 is installed on site, the center of the porous balance plate core 1 is coincided with the center of the fluid pipeline 8, and a detection surface of the porous balance plate core 1 forms an angle of 90 degrees with the axis of the pipeline; the protective tube 7 is combined with the fluid pipeline 8 and plays a role of fixing the porous balance plate core 1.

The head of the pluggable probe is of a hexagonal prism structure, the upper part of one edge is downwards inclined to the axis at an angle of 15-45 degrees, and the head of the pluggable probe is obliquely cut down to the position of 2-3 mm of the axis, namely a positive pressure detection surface, and a positive pressure tapping opening is formed at the position; the cross section of the lower part of the inclined plane and the cross section of the hexagonal prism are negative pressure detection surfaces, and a negative pressure taking opening is arranged at the negative pressure detection surfaces. The negative pressure sensing face is parallel to the direction of fluid flow and is at 90 ° to the axis of the probe. The upper part of the pluggable hexagonal prism probe is led out by a round tube-shaped probe rod 9, and the positive pressure tube 2 and the negative pressure tube 3 are extended by the probe rod 9 in the probe rod 9 and then are used for detecting the flow differential pressure value outside the protection tube 7.

The porous balance plate core 1 is provided with a plurality of uniformly distributed balance holes 11. The size and the number of the balance holes 11 can be determined according to the working condition of the fluid, and the balance holes 11 can be at least zero (when the flow rate of the fluid is low or the differential pressure value is too low, the design of the balance holes 11 can be cancelled to increase the static pressure difference, and the balance holes 11 of the balanced type center pressure-taking gapless flow meter can not be cancelled to be zero). When the fluid flow rate is low, the balance hole 11 can be eliminated to obtain enough throttling effect to obtain larger static pressure difference, so as to ensure the measurement accuracy.

As shown in fig. 8 to 10, the flow meter with a non-center detection hole of the multi-hole balance plate core 1 specifically means that the center area of the multi-hole balance plate core 1 is a plate-shaped structure, and the positive pressure tapping and the negative pressure tapping extend to the center position of the multi-hole balance plate core 1 respectively.

The central area of the porous balance board core 1 is a plate-shaped structure, which means that the central position of the porous balance board core 1 is a solid structure without a central detection hole. Namely, on the basis of balancing the full-pressure flowmeter, the flow velocity detection hole 4 is canceled, and then the positive pressure taking port and the negative pressure taking port are respectively moved to the center positions of the front surface and the back surface of the porous balance plate.

The device has the following two installation forms, specifically as shown in the following:

the porous balance plate core 1 is installed in the fluid pipeline 8, and a gap exists between the edge of the porous balance plate core 1 and the inner wall of the fluid pipeline 8 (as shown in figures 1, 3-5, 7-8 and 10).

The porous balance plate core 1 is installed in the fluid pipeline 8, and the edge of the porous balance plate core 1 is contacted with the inner wall of the fluid pipeline 8 (as shown in figures 2, 6 and 9).

I.e. whether there is a gap between the porous balancing plate core 1 and the fluid conduit 8, and the size of the gap is determined according to the contamination of the fluid.

During installation of the porous balance plate core 1, the balance full-pressure flowmeter is installed in a short pipe with the same diameter as the fluid pipeline 8 on the spot, and the short pipe can be combined with the fluid pipeline 8 on the spot in the same way as the existing orifice plate flowmeter (as shown in figures 1-2, 5-6 and 8-9).

In the installation process of the porous balance plate core 1, the flowmeter adopting a portable installation mode firstly sets a rectangular temporary insertion groove along the axis of a pipeline on a fluid pipeline 8, the length of the temporary insertion groove is based on that the porous balance plate core 1 can be completely inserted into the fluid pipeline 8, after the porous balance plate is inserted into the fluid pipeline 8, the porous balance plate is rotated to be parallel to the cross section of the pipeline, the portable porous balance plate is fixed on the wall of a side pipe of a rectangular port fluid, then the temporary insertion groove is closed, and the original shape of the pipeline is recovered. The method for installing the balance plate core into the center of the pipeline through the upper opening of the pipeline effectively avoids the condition that the pore plate of the large-diameter pipeline is inconvenient to install, and the balance plate core is installed at the upper opening of the pipeline in a portable mode, so that the installation is convenient, the rectangular temporary insertion groove is located on the rear side of the porous balance plate core 1, and the influence of rough surfaces such as pipeline welding seams for closing the temporary insertion groove on the pressure detection of the fluid can be avoided (as shown in figures 3-4, 7 and 10). In addition, the shape of the porous balance plate core 1 can be round or rectangular (rectangular in fig. 4), that is, the shape can be set according to the working condition.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A balanced type total pressure flowmeter is characterized by comprising a porous balance plate core, a positive pressure pipe and a negative pressure pipe;

the porous balance plate core is provided with a porous structure;

2. The balanced full pressure flow meter according to claim 1, wherein said porous balance core is provided with flow rate detection holes;

3. The balanced type total pressure flowmeter according to claim 2, wherein the positive pressure pipe is arranged in fit with the positive pressure detection surface, and the negative pressure pipe is arranged in fit with the negative pressure detection surface;

4. The balanced type total pressure flow meter according to claim 2, characterized in that the balanced type total pressure flow meter comprises a columnar probe, the section of the columnar probe is hexagonal;

5. The balanced full pressure flow meter according to claim 1, wherein the porous balance plate core is further provided with a rectifying hole;

6. The balanced type total pressure flow meter according to claim 1, wherein a plurality of balance holes are uniformly distributed on the porous balance plate core by taking the center of the balance plate core as the center of a circle.

7. The balanced, full pressure flow meter according to claim 1 wherein the porous balance core is mounted within the fluid conduit with a spacing between the edges of the porous balance core and the inner wall of the fluid conduit.

8. The balanced, full pressure flow meter according to claim 1 wherein the porous balance core is mounted within the fluid conduit with the edges of the porous balance core in contact with the inner wall of the fluid conduit.

9. The balanced type total pressure flowmeter according to claim 1, wherein a protection pipe is arranged on the porous balance plate core, and the protection pipe extends from the outer wall of the fluid pipeline to a positive pressure pipe and a negative pressure pipe pressure taking port in the pipeline;

10. The balanced full pressure flow meter according to claim 1, wherein the central area of the porous balance core is a plate-like structure, and the positive pressure port and the negative pressure port extend to the central position of the porous balance core respectively.